[Docs] [txt|pdf] [Tracker] [WG] [Email] [Diff1] [Diff2] [Nits] [IPR]

Versions: (draft-lefaucheur-ancp-mc-extensions) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16

ANCP                                                      F. Le Faucheur
Internet-Draft                                                     Cisco
Intended status: Standards Track                             R. Maglione
Expires: April 29, 2010                                   Telecom Italia
                                                               T. Taylor
                                                                  Huawei
                                                        October 26, 2009


            Additional Multicast Control Extensions for ANCP
                  draft-ietf-ancp-mc-extensions-01.txt

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.  This document may contain material
   from IETF Documents or IETF Contributions published or made publicly
   available before November 10, 2008.  The person(s) controlling the
   copyright in some of this material may not have granted the IETF
   Trust the right to allow modifications of such material outside the
   IETF Standards Process.  Without obtaining an adequate license from
   the person(s) controlling the copyright in such materials, this
   document may not be modified outside the IETF Standards Process, and
   derivative works of it may not be created outside the IETF Standards
   Process, except to format it for publication as an RFC or to
   translate it into languages other than English.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on April 29, 2010.

Copyright Notice

   Copyright (c) 2009 IETF Trust and the persons identified as the



Le Faucheur, et al.      Expires April 29, 2010                 [Page 1]

Internet-Draft          ANCP Multicast Extensions           October 2009


   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents in effect on the date of
   publication of this document (http://trustee.ietf.org/license-info).
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.












































Le Faucheur, et al.      Expires April 29, 2010                 [Page 2]

Internet-Draft          ANCP Multicast Extensions           October 2009


Abstract

   This document specifies the extensions to the Access Node Control
   Protocol required for support of the multicast use cases defined in
   the Access Node Control Protocol framework document.  Those use cases
   are organized into the following ANCP capabilities:

   o  NAS-initiated multicast replication;

   o  conditional access with white and black lists;

   o  conditional access with grey lists;

   o  bandwidth delegation.

   These capabilities may be combined according to the rules given in
   this specification.


































Le Faucheur, et al.      Expires April 29, 2010                 [Page 3]

Internet-Draft          ANCP Multicast Extensions           October 2009


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  7
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  9
   3.  Multicast Use Cases  . . . . . . . . . . . . . . . . . . . . . 10
     3.1.  NAS Initiated Multicast Replication Control Use Case . . . 10
       3.1.1.  Goals  . . . . . . . . . . . . . . . . . . . . . . . . 10
       3.1.2.  Message Flow . . . . . . . . . . . . . . . . . . . . . 11
     3.2.  Conditional Access and Admission Control Use Case  . . . . 11
       3.2.1.  Goals  . . . . . . . . . . . . . . . . . . . . . . . . 11
       3.2.2.  Message Flow . . . . . . . . . . . . . . . . . . . . . 12
     3.3.  Multicast Flow Reporting Use Case  . . . . . . . . . . . . 13
       3.3.1.  Goals  . . . . . . . . . . . . . . . . . . . . . . . . 13
       3.3.2.  Message Flow . . . . . . . . . . . . . . . . . . . . . 13
   4.  ANCP Messages  . . . . . . . . . . . . . . . . . . . . . . . . 14
     4.1.  Provisioning Message . . . . . . . . . . . . . . . . . . . 14
       4.1.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 14
       4.1.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 15
     4.2.  Port Management Message  . . . . . . . . . . . . . . . . . 16
       4.2.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 16
       4.2.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 17
     4.3.  Multicast Replication Control Message  . . . . . . . . . . 17
       4.3.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 21
       4.3.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 22
     4.4.  Multicast Admission Control Message  . . . . . . . . . . . 24
       4.4.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 25
       4.4.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 26
     4.5.  Bandwidth Reallocation Request Message . . . . . . . . . . 27
       4.5.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 28
       4.5.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 28
     4.6.  Bandwidth Transfer Message . . . . . . . . . . . . . . . . 30
       4.6.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 31
       4.6.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 31
     4.7.  Delegated Bandwidth Query Request Message  . . . . . . . . 32
       4.7.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 33
       4.7.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 33
     4.8.  Delegated Bandwidth Query Response Message . . . . . . . . 33
       4.8.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 34
       4.8.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 34
     4.9.  Multicast Flow Query Request and Response Messages . . . . 35
       4.9.1.  Sender Behaviour . . . . . . . . . . . . . . . . . . . 35
       4.9.2.  Receiver Behaviour . . . . . . . . . . . . . . . . . . 36
   5.  ANCP TLVs and Sub-TLVs . . . . . . . . . . . . . . . . . . . . 38
     5.1.  Multicast-Service-Profile TLV  . . . . . . . . . . . . . . 38
     5.2.  Command Number TLV . . . . . . . . . . . . . . . . . . . . 41
     5.3.  Bandwidth-Allocation TLV . . . . . . . . . . . . . . . . . 41
     5.4.  White-List-CAC TLV . . . . . . . . . . . . . . . . . . . . 42
     5.5.  MRepCtl-CAC TLV  . . . . . . . . . . . . . . . . . . . . . 42



Le Faucheur, et al.      Expires April 29, 2010                 [Page 4]

Internet-Draft          ANCP Multicast Extensions           October 2009


     5.6.  Bandwidth-Request TLV  . . . . . . . . . . . . . . . . . . 42
     5.7.  Multicast-Service-Profile-Name TLV . . . . . . . . . . . . 43
     5.8.  Request-Source-IP sub-TLV  . . . . . . . . . . . . . . . . 43
     5.9.  Request-Source-MAC sub-TLV . . . . . . . . . . . . . . . . 44
     5.10. Multicast-Flow TLV . . . . . . . . . . . . . . . . . . . . 45
   6.  Multicast Capabilities . . . . . . . . . . . . . . . . . . . . 46
     6.1.  Required Protocol Support  . . . . . . . . . . . . . . . . 46
       6.1.1.  Protocol Requirements For NAS-initiated Replication  . 46
       6.1.2.  Protocol requirements For Conditional Access With
               White and Black Lists  . . . . . . . . . . . . . . . . 47
       6.1.3.  Protocol requirements For Conditional Access With
               Grey Lists . . . . . . . . . . . . . . . . . . . . . . 48
       6.1.4.  Protocol requirements For Delegated Bandwidth  . . . . 49
     6.2.  Capability-Specific Procedures for Providing Multicast
           Service  . . . . . . . . . . . . . . . . . . . . . . . . . 50
       6.2.1.  Procedures For NAS-initiated Replication . . . . . . . 50
       6.2.2.  Procedures For Conditional Access With Black and
               White Lists  . . . . . . . . . . . . . . . . . . . . . 51
       6.2.3.  Procedures For Conditional Access With Grey Lists  . . 52
       6.2.4.  Procedures For Delegated Bandwidth . . . . . . . . . . 53
     6.3.  Combinations of Multicast Capabilities . . . . . . . . . . 54
       6.3.1.  Combination of NAS-Initiated Replication with
               Other Capabilities . . . . . . . . . . . . . . . . . . 54
       6.3.2.  Conditional Access With White, Black, and Grey
               Lists  . . . . . . . . . . . . . . . . . . . . . . . . 55
       6.3.3.  Conditional Access Combined With Delegated
               Bandwidth  . . . . . . . . . . . . . . . . . . . . . . 56
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 57
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 58
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 62
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 63
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 63
     10.2. Informative References . . . . . . . . . . . . . . . . . . 63
   Appendix A.  Example of Messages and Message Flows . . . . . . . . 65
     A.1.  Multicast Conditional Access and CAC without AN
           bandwidth delegation . . . . . . . . . . . . . . . . . . . 65
       A.1.1.  List/Profile Provisioning  . . . . . . . . . . . . . . 65
       A.1.2.  Profile Mapping  . . . . . . . . . . . . . . . . . . . 67
       A.1.3.  Successful Join/Leave Operations . . . . . . . . . . . 67
       A.1.4.  Admission Control Reject without NAS Response  . . . . 73
       A.1.5.  Admission Control Reject with NAS Response . . . . . . 75
     A.2.  Example Flows For bandwidth delegation . . . . . . . . . . 79
       A.2.1.  Activation and Provisioning of total multicast
               Bandwidth  . . . . . . . . . . . . . . . . . . . . . . 80
       A.2.2.  Successful Request For More Multicast Bandwidth  . . . 81
       A.2.3.  Failed Autonomous Transfer With Reset  . . . . . . . . 83
     A.3.  Example Flows For Multicast Flow Reporting . . . . . . . . 86
       A.3.1.  Per Port Multicast Flow Reporting  . . . . . . . . . . 86



Le Faucheur, et al.      Expires April 29, 2010                 [Page 5]

Internet-Draft          ANCP Multicast Extensions           October 2009


   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 91


















































Le Faucheur, et al.      Expires April 29, 2010                 [Page 6]

Internet-Draft          ANCP Multicast Extensions           October 2009


1.  Introduction

   [I-D.ietf-ancp-framework] defines a framework and requirements for an
   Access Node control mechanism between a Network Access Server (NAS)
   and an Access Node (e.g. a Digital Subscriber Line Access Multiplexer
   (DSLAM)) in a multi-service reference architecture in order to
   perform QoS-related, service-related and subscriber-related
   operations.  [I-D.ietf-ancp-protocol] specifies a protocol for Access
   Node Control in broadband networks in line with this framework.

   The Access Node Control Protocol (ANCP) specified in
   [I-D.ietf-ancp-protocol] supports a number of use cases defined in
   [I-D.ietf-ancp-framework] such as the Access Topology Discovery use
   case, the Access Loop Configuration use case and the Remote
   Connectivity Test use case.  However, it does not support the
   multicast use cases defined in [I-D.ietf-ancp-framework].  The
   present document specifies the extensions to the Access Node Control
   Protocol required for support of these multicast use cases.  In terms
   of the ANCP protocol, these use cases are organized into four
   capabilities:

   o  NAS-initiated multicast replication;

   o  conditional access with white and black lists;

   o  conditional access with grey lists;

   o  bandwidth delegation.

   NAS-initiated multicast replication assumes that multicast "join" and
   "leave" requests are terminated on the NAS, or that the NAS receives
   requests to establish multicast sessions through other means (e.g.,
   application-level signalling).  The NAS sends commands to the AN to
   start or stop replication of specific multicast flows on specific
   subscriber ports.  This use case is described briefly in the next-to-
   last paragraph of section 3.4 of [I-D.ietf-ancp-framework].

   Conditional access is described in sections 3.4.1 and 3.4.2.3 of
   [I-D.ietf-ancp-framework], with the latter section particularly
   applicable to operation with white and black lists only.  In case of
   "conditional access with white and black lists", multicast join and
   leave requests are terminated at the AN and accepted or ignored in
   accordance with the direction provided by white and black lists
   respectively.  The white and black lists are provisioned per port at
   startup time and may be modified thereafter.  The NAS may enable
   admission control of White-listed flows by appropriate provisioning.
   If the bandwidth delegation capability has also been negotiated, that
   capability provides a means to adjust the multicast bandwidth limits



Le Faucheur, et al.      Expires April 29, 2010                 [Page 7]

Internet-Draft          ANCP Multicast Extensions           October 2009


   at the AN.

   Conditional access with grey lists is similar to conditional access
   with white lists, except that before accepting any request matching a
   grey list entry, the AN sends a request to the NAS for permission to
   replicate the flow.  Again, the NAS can enable admission control of
   Grey-listed flows at the AN.  It can control the application of
   admission control on a per-flow basis.

   Bandwidth delegation is described in section 3.4.2.1 of
   [I-D.ietf-ancp-framework].  It allows flexible sharing of total video
   bandwidth on an access line between the AN and the NAS.  One
   application of such bandwidth sharing is where the AN does multicast
   admission control, while the NAS or Policy Server does unicast
   admission control.  In that case, bandwidth delegation allows dynamic
   sharing of bandwidth between unicast and multicast video traffic on
   each access line.

   The formal specification of the behaviours associated with each of
   these capabilities, singly and in combination, is given in Section 6.

   In addition to the multicast service processing behaviour just
   sketched, the definition of each capability includes support for the
   multicast accounting and reporting services described in section
   3.4.3 of [I-D.ietf-ancp-framework].  Because of this common content
   and because of other protocol overlaps between the different
   capabilities, the protocol descriptions for the multicast extensions
   specified in this document are merged into a single non-redundant
   narrative.  Tables in Section 6 then indicate the specific sub-
   sections of the protocol description that have to be implemented to
   support each capability.




















Le Faucheur, et al.      Expires April 29, 2010                 [Page 8]

Internet-Draft          ANCP Multicast Extensions           October 2009


2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   The expression "delegated bandwidth" is used as a shorter way of
   saying: "the total amount of video bandwidth delegated to the AN for
   multicast admission control".










































Le Faucheur, et al.      Expires April 29, 2010                 [Page 9]

Internet-Draft          ANCP Multicast Extensions           October 2009


3.  Multicast Use Cases

   Quoting from [I-D.ietf-ancp-framework]:

   "... the Access Node, aggregation node(s) and the NAS must all be
   involved in the multicast replication process.  This avoids that
   several copies of the same stream are sent within the access/
   aggregation network.  In case of an Ethernet-based access/aggregation
   network, this may, for example, be achieved by means of IGMP snooping
   or IGMP proxy in the Access Node and aggregation node(s).  By
   introducing IGMP processing in the access/aggregation nodes, the
   multicast replication process is now divided between the NAS, the
   aggregation node(s) and Access Nodes.  In order to ensure backward
   compatibility with the ATM-based model, the NAS, aggregation node and
   Access Node need to behave as a single logical device.  This logical
   device must have exactly the same functionality as the NAS in the ATM
   access/aggregation network.  The Access Node Control Mechanism can be
   used to make sure that this logical/functional equivalence is
   achieved by exchanging the necessary information between the Access
   Node and the NAS.  "

   [I-D.ietf-ancp-framework] describes the use cases for ANCP associated
   with such multicast operations, and identifies the associated ANCP
   requirements.  The present section describes a subset of these use
   cases as background to facilitate reading of this document, but the
   reader is refered to [I-D.ietf-ancp-framework] for a more exhaustive
   description of the ANCP multicast use cases.  Detailed example
   message flows can also be found in Appendix A.

3.1.  NAS Initiated Multicast Replication Control Use Case

3.1.1.  Goals

   One option for multicast handling is for the subscriber to
   communicate the "join/leave" information to the NAS.  This can be
   done for instance by terminating all subscriber IGMP ([RFC3376]) or
   MLD ([RFC2710], [RFC3810]) signaling on the NAS.  Another example
   could be a subscriber using some form of application level signaling,
   which is redirected to the NAS.  In any case, this option is
   transparent to the access and aggregation network.  In this scenario,
   the NAS uses ANCP to create and remove replication state in the AN
   for efficient multicast replication.  Thus, the NAS only sends a
   single copy of the multicast stream towards the AN, which in turn
   performs replication to multiple subscribers as instructed by the NAS
   via ANCP.  The NAS first performs conditional access and multicast
   admission control when processing multicast join requests, and only
   creates replication state in the AN if admission succeeds.




Le Faucheur, et al.      Expires April 29, 2010                [Page 10]

Internet-Draft          ANCP Multicast Extensions           October 2009


3.1.2.  Message Flow

   With the NAS-initiated use case, a Multicast Replication Control
   Message is sent by the NAS to the AN with a directive to either join
   or leave one (or more) multicast flow(s).  The AN uses a Generic
   Response message to convey the outcome of the directive.  Figure 1
   illustrates such an ANCP message exchange as well as the associated
   AN behavior.

   +----------+    +-------+     +-----+        ANCP          +-----+
   |Subscriber|    | Home  |     | AN  |<-------------------->| NAS |
   +----------+    |Gateway|     +-----+                      +-----+
         |         +-------+         |                           |
         |            |              | Multicast-Replication-Crl |
         |            |              |   (Target,add, Flow 1)    |
         |            |              |<--------------------------|
         |       Mcast Flow 1        |                           |
         |<==========================+                           |
         |            |              |     Generic Response      |
         |            |              |-------------------------->|
         |            |              |                           |
         |            |              |                           |
         ~            ~              ~                           ~
         |            |              |                           |
         |            |              | Multicast-Replication-Crl |
         |            |              |   (Target,delete, Flow 1) |
         |            |              |<--------------------------|
         |            |              |                           |
         |  <Stop Replication of     X                           |
         |            Mcast Flow 1>  |     Generic Response      |
         |            |              |-------------------------->|

           Figure 1: NAS Initiated Multicast Replication Control

3.2.  Conditional Access and Admission Control Use Case

3.2.1.  Goals

   One option for multicast handling is for the access/aggregation nodes
   to participate in IGMP/MLD processing (e.g. via IGMP/MLD snooping).
   In this scenario, on detecting a join/leave request from an enduser
   for a multicast flow (in the grey list), the AN uses ANCP to request
   conditional access and admission control decision from the NAS.  In
   turn, after conditional access and admission control checks, the NAS
   uses ANCP to instruct the AN to change the replication states
   accordingly.





Le Faucheur, et al.      Expires April 29, 2010                [Page 11]

Internet-Draft          ANCP Multicast Extensions           October 2009


3.2.2.  Message Flow

   For support of the conditional access and admission control use case,
   on detection of an IGMP/MLD Join, the AN sends an Admission Control
   message to the NAS to request conditional access and admission
   control check.  In case of positive outcome, the NAS sends a
   Multicast Replication Control Message to the AN with a directive to
   replicate the multicast flow to the corresponding user.  Similarly on
   detection of an IGMP/MLD leave, an Admission Control message is sent
   by the AN to the NAS to keep the NAS aware of user departure for the
   flow.  This message flow is illustrated in Figure 2.

   +----------+    +-------+   +-----+      ANCP           +-----+
   |Subscriber|    | Home  |   | AN  |<------------------->| NAS |
   +----------+    |Gateway|   +-----+                     +-----+
         |         +-------+      |                           |
         |            |           |                           |
         |       Join(Gr-Flow1)   |  Admission-Control        |
         |------------+---------->|   (Target,add,Gr-Flow1)   |
         |            |           |-------------------------->|
         |            |           |                          (*)
         |            |           | Multicast-Replication-Crl |
         |            |           |   (Target,add,Gr-Flow 1)  |
         |            |           |<--------------------------|
         |     Mcast Gr-Flow1     |                           |
         |<=======================+                           |
         |            |           |                           |
         ~            ~           ~                           ~
         |            |           |                           |
         |      Leave(Gr-Flow1)   |  Admission-Control        |
         |------------+---------->| (Target,delete,Gr-Flow1)  |
         |            |           |-------------------------->|
         | <Stop Replication of   X                           |
         |       Mcast Gr-Flow1>  |                           |
         |            |           |                           |


   Gr-Flow1: a multicast flow matching the grey list for that port

   (*) The NAS may optionally seek direction from an external
       Authorization/Policy Server

       Figure 2: Multicast Conditional Access and Admission Control








Le Faucheur, et al.      Expires April 29, 2010                [Page 12]

Internet-Draft          ANCP Multicast Extensions           October 2009


3.3.  Multicast Flow Reporting Use Case

3.3.1.  Goals

   The Multicast flow reporting use case allows the NAS to
   asynchronously query the AN to obtain an instantaneous status report
   related to multicast flows currently replicated by the AN.

3.3.2.  Message Flow

   The NAS sends a Multicast Flow Query Request message to the AN in
   order to query the AN about information such as which multicast flows
   are currently active on a given AN port or which ports are currently
   replicating a given multicast flow.  The AN conveys the requested
   information to the NAS in a Multicast Flow Query Response message.
   This message flow is illustrated in Figure 3.

   +----------+    +-------+   +-----+    ANCP    +-----+
   |Subscriber|    | Home  |   | AN  |<---------->| NAS |
   +----------+    |Gateway|   +-----+            +-----+
         |         +-------+     |                   |
         |           |           |  Multicast Flow   |
         |           |           |  Query Request    |
         |           |           |<------------------|
         |           |           |                   |
         |           |           | Multicast Flow    |
         |           |           | Query Response    |
         |           |           |------------------>|
         |           |           |                   |
         |           |           |                   |

                    Figure 3: Multicast Flow Reporting



















Le Faucheur, et al.      Expires April 29, 2010                [Page 13]

Internet-Draft          ANCP Multicast Extensions           October 2009


4.  ANCP Messages

   This section defines new ANCP messages and new usage of existing ANCP
   messages as well as procedures associated with the use of these
   messages.

4.1.  Provisioning Message

   Section 5.4.3.1 of [I-D.ietf-ancp-protocol] defines the Provisioning
   message that is sent by the NAS to the AN to provision information in
   the AN.

   The present document specifies that the Provisioning message MAY be
   used by the NAS to provision multicast-related information (e.g.
   multicast service profiles).  The ANCP Provisioning message payload
   MAY contain:

   o  one or more instances of the Multicast-Service-Profile TLV.  The
      Multicast-Service-Profile TLV is defined in the present document
      in Section 5.1.  Each instance of the Multicast-Service-Profile
      TLV contains a Multicast Service Profile name and one or more list
      actions.  A list action consists of an action (add, delete,
      replace), a list type (White, Black, or Grey), and list content
      (multicast source and group addresses).

   o  an instance of the White-List-CAC TLV.  The White-List-CAC TLV is
      defined in section TLV_White_AC.  If present, this TLV indicates
      that the AN is required to do admission control before replicating
      White-listed flows.

   o  an instance of the MRepCtl_CAC TLV.  The MRepCtl-CAC TLV is
      defined in section TLV_MRepCtl_AC.  If present, this TLV indicates
      that the AN may be required to do admission control before
      replicating flows specified in Multicast Replication Control
      messages.

   See Section 6 for information on which multicast capabilities require
   support of these TLVs in the Provisioning message.

4.1.1.  Sender Behaviour

   When directed by the Policy Server or by management action, the NAS
   sends the Provisioning message to initially provision or to update
   the White, Black, and/or Grey multicast channel lists associated with
   a set of named multicast service profiles, or to enable the AN to
   perform admission control for specific classes of flows.

   To provision or update a multicast service profile, the NAS MUST



Le Faucheur, et al.      Expires April 29, 2010                [Page 14]

Internet-Draft          ANCP Multicast Extensions           October 2009


   include within the message one or more instances of the Multicast-
   Service-Profile TLV specifying the content to be provisioned or
   updated.  The NAS SHOULD NOT include any list type (White, Black, or
   Grey) that is not supported by the set of multicast capabilities
   negotiated between the NAS and the AN.  The NAS MUST NOT use the
   Provisioning message to send instances of the Multicast-Service-
   Profile TLV to the AN unless the Multicast-Service-Profile TLV is
   supported by the set of multicast capabilities negotiated between the
   NAS and the AN.

   To require admission control to be performed at the AN on White-
   listed flows, the NAS MUST include a copy of the White-List-CAC TLV
   in the Provisioning message.  The White-List-CAC TLV MUST NOT be
   provided unless the negotiated set of capabilities includes
   conditional access with White and Black lists.

   To require admission control to be performed at the AN on Grey-listed
   flows or on NAS-initiated flows, the NAS MUST include a copy of the
   MRepCtl-CAC TLV in the Provisioning message.  The MRepCtl-CAC TLV
   MUST NOT be provided unless the negotiated set of capabilities
   includes NAS-initiated replication control or conditional access with
   Grey lists.

4.1.2.  Receiver Behaviour

   The receiving AN provisions/updates the White, Black, and/or Grey
   lists associated with the Multicast Service Profile names contained
   in the Multicast-Service-Profile TLV instances within the message.
   The AN MUST ignore instances of the Multicast-Service-Profile TLV
   referring to any list type (White, Black, or Grey) that is not
   supported by the set of multicast capabilities negotiated between the
   NAS and the AN.

   When a new Multicast Service Profile is identified by a Multicast-
   Service-Profile TLV, the initial state of all lists associated with
   that profile according to the negotiated set of multicast
   capabilities is empty until changed by the contents of Multicast-
   Service-Profile TLVs.

   If the White-List-CAC and/or MRepCtl-CAC TLV is present in the
   Provisioning message and the respective associated capabilities have
   been negotiated, the AN prepares to do connection admission control
   on the indicated class(es) of flow.

   As indicated in [I-D.ietf-ancp-protocol], the AN MUST NOT reply to
   the Provisioning message if it processed it successfully.  If an
   error prevents successful processing of the message content, the AN
   MUST return a Generic Response message as defined in



Le Faucheur, et al.      Expires April 29, 2010                [Page 15]

Internet-Draft          ANCP Multicast Extensions           October 2009


   [I-D.ietf-ancp-protocol], containing a Status-Info TLV with the
   appropriate content describing the error.  For this purpose, the
   presence of a list typein a Multicast-Service-Profile TLV which was
   ignored because it was not supported by the negotiated set of
   capabilities is not considered to be an error.

      Editor's note: that means that if a NAS mistakenly adds the wrong
      list types there will be no debugging feedback.  On the other
      hand, this adds flexibility for handling pre-assembled sets of
      list updates being sent out to multiple ANs.  If there are no
      comments on this feature/bug, this Editor's note will be removed
      in the next version of the draft.

   When a new Multicast Service Profile is identified by a Multicast-
   Service-Profile TLV, the initial state of all lists associated with
   that profile according to the negotiated set of multicast
   capabilities is empty until changed by the contents of Multicast-
   Service-Profile TLVs.

4.2.  Port Management Message

   As specified in [I-D.ietf-ancp-protocol], the NAS may send line
   configuration information to the AN ("ANCP based Line Configuration"
   use case) using GSMP Port Management messages modified to contain an
   extension block.  Section 5.4.3 of [I-D.ietf-ancp-protocol] defines a
   number of TLVs that can be included in the Extension Value field
   inside a Port Management message to support line configuration.

   This document specifies that the Port Management message MAY also
   include the following TLVs:

   o  "Multicast-Service-Profile-Name" TLV (defined in Section 5.7).
      This TLV associates a Multicast Service Profile with the Access
      Port specified by the extension block.

   o  "Bandwidth-Allocation" TLV (defined in Section 5.3).  This TLV
      specifies the total multicast bandwidth available to the AN for
      admission control at the Access Port.

4.2.1.  Sender Behaviour

   The NAS sends the Port Management message at startup time to
   initialize parameters associated with the Access Port specified in
   the message and with the multicast capabilities negotiated between
   the NAS and the AN.  The NAS MAY send additional Port Management
   messages subsequent to startup, to update or, in the case of the
   Bandwidth-Allocation TLV, reset these parameters.  The NAS MUST NOT
   include a TLV unless it is supported by the set of multicast



Le Faucheur, et al.      Expires April 29, 2010                [Page 16]

Internet-Draft          ANCP Multicast Extensions           October 2009


   capabilities negotiated between the NAS and the AN.  See Section 6
   for further information.

4.2.2.  Receiver Behaviour

   If the Port Management message contains a Multicast-Service-Profile-
   Name TLV, the AN associates the named profile with the specified
   Access Port.  This association replaces any previous association.
   That is, a given Access Port is associated with at most one Multicast
   Service Profile.

   As specified in [I-D.ietf-ancp-framework], if a join request is later
   received by the AN for a multicast flow that is part of multiple
   lists in the Multicast Service Profile associated with the Access
   Port, then the most specific match MUST be used by the AN.  If the
   most specific match occurs in multiple lists, the Black list entry
   MUST take precedence over the Grey list, which MUST take precedence
   over the White list.  If the requested multicast flow is not part of
   any list, the AN SHOULD ignore the join request.

   If the Port Management message contains a Bandwidth-Allocation TLV,
   the AN adopts this as the current value of its total multicast
   bandwidth limit for the Access Port.  If the AN has already committed
   multicast bandwidth exceeding the amount given in the Bandwidth-
   Allocation TLV, the AN SHOULD NOT discontinue any multicast streams
   in order to bring bandwidth down to within the new limit.  However,
   the AN MUST NOT admit new multicast streams that are subject to
   admission control until it can do so within the limit specified by
   the Bandwidth-Allocation TLV.

   If the Port Management request cannot be processed due to error and
   the Result field of the request is Nack (0x1) or AckAll (0x2), the AN
   SHOULD add a Status-Info TLV to the Extension Value field in its
   reply if this will provide useful information beyond what is provided
   by the Code value returned in the response header.

4.3.  Multicast Replication Control Message

   This section defines a new message called the Multicast Replication
   Control message.  The Multicast Replication Control message is sent
   by the NAS to the AN with one or more directives to add (join) or
   delete (leave) a multicast flow on a target object identified in the
   content of the message.

   The Message Type for the Multicast Replication Control message is
   0x90.

   The ANCP Multicast Replication Control message payload contains the



Le Faucheur, et al.      Expires April 29, 2010                [Page 17]

Internet-Draft          ANCP Multicast Extensions           October 2009


   following TLVs:

   o  Target TLV: The Target TLV is defined in [I-D.ietf-ancp-protocol].
      It MUST appear once and only once.  It is encoded as specified in
      [I-D.ietf-ancp-protocol] and identifies the AN port subject to the
      request for admission or release.

   o  Command TLV: The Command TLV is defined in
      [I-D.ietf-ancp-protocol].  It MUST be present.  It MAY appear
      multiple times.  Each Command TLV contains a multicast flow
      directive for the target.

   The contents of the Command TLV for the Multicast Replication Control
   Message are defined in Figure 4 and subsequent text.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Command Code  |R O M   Flags  |         Command Length        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                  Multicast Flow Source Address                |
       +-+-+-+-+-+-+-+-+-+-+-+-+-\   /-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   (Cont'd)  ...         /   \ | Multicast Flow Group Address  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-\   /-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   (Cont'd)  ...        /   \  | Sub-TLVs ...                  |
       +-+-+-+-+-+-+-+-+-+-+-+-+\   /+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   (Cont'd)  ...        /   \  | Padding to 32-bit boundary    |
       +-+-+-+-+-+-+-+-+-+-+-+-+\   /+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 4: Contents of the Command TLV in the Multicast Replication
                              Control Message

   Command Code:
             Command directive: 0x01 - Add; 0x02 - Delete; 0x03 - Delete
             All.

   Command Length:
             Length in bytes of the Command including multicast flow
             address, but excluding the Command Code header and flags.

   Flags:
             8 bit General purpose Flag field.  Currently the following
             flags are defined:

             R -       Resource Admitted Flag.  Set to 1 in an add
                       command to indicate that the flow resources have
                       been reserved by admission control.  Cleared to 0
                       otherwise.



Le Faucheur, et al.      Expires April 29, 2010                [Page 18]

Internet-Draft          ANCP Multicast Extensions           October 2009


             O -       Flow Accounting.  When set in add command
                       indicates that byte accounting for the flow is to
                       commence.

             M -       When set, indicates that the multicast flow is
                       SSM; the Command MUST then specify both the
                       source and the group address.  When not set,
                       indicates that the multicast flow is ASM; the
                       Command MUST then specify the group address only,
                       omitting the Source Address field.

   Multicast Flow Source Address:
             a field containing three sub-fields as illustrated in
             Figure 5, giving the source address for an SSM flow.  This
             field MUST be present if the M flag is set, and MUST NOT be
             present if the M flag is cleared.

   Multicast Flow Group Address:
             a field containing three sub-fields as illustrated in
             Figure 5, giving the group address for the multicast flow.
             This field MUST be present.

   The address family of the group address MAY differ from the address
   family of the source address, if present.

   For future extensibility, each Command TLV MAY also have additional
   sub-TLVs appended following the command and multicast flow
   information (shown as "Sub-TLVs" in Figure 4).  Unrecognized sub-TLVs
   SHOULD be silently discarded.

   If needed, padding is done at the end of the command data so that the
   TLV is 32-bit aligned.

   As shown in Figure 5, each address entry in the Command TLV consists
   of the following three sub-fields with no intervening padding:

   Address Family:
      The address family of the address with values as defined in
      [IANAAEA].

   Encoding Type:
      The type of encoding used within a specific Address Family.  The
      value `0' is reserved for this field, and represents the native
      encoding of the Address Family.  This is consistent with the
      address encoding specified in [RFC4601].






Le Faucheur, et al.      Expires April 29, 2010                [Page 19]

Internet-Draft          ANCP Multicast Extensions           October 2009


   Address:
      The address as represented by the given Address Family and
      Encoding Type.  This is consistent with the address encoding
      specified in [RFC4601].

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Addr Family   | Encoding Type | IP Address                    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/-+-+-+-+-+-+-+-+
       |                    IP Address (Cont'd)  ...   \
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/-+-+-+-+-+-+-+-+

       Figure 5: Structure of the Address Fields in the Command TLV

   The figure below is an example of a Multicast Replication Control
   message that would result in a swap from multicast SSM flows
   192.0.2.1, 233.252.0.2, to 192.0.2.2, 233.252.0.3 on the Target
   identified by the "Access Loop Circuit ID":
































Le Faucheur, et al.      Expires April 29, 2010                [Page 20]

Internet-Draft          ANCP Multicast Extensions           October 2009


       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=90 | 0x02  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0001      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type = Target 0x1000   |        Target TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type = Command TLV     |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0x02 |0 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |Mcast Source (Ctnd) 192.0.2.1  | AddrFamily 01 | EncType 0x0   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      Mcast Flow : 233.252.0.2                 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
       |        Type = Command-TLV     |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0x01 |0 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.2      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |Mcast Source (Ctnd) 192.0.2.2  | AddrFamily 01 | EncType 0x0   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     Mcast Flow: 233.252.0.3                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



4.3.1.  Sender Behaviour

   The NAS MAY issue a Multicast Replication Control message to the AN
   to convey one or more directives to add (join) or delete (leave) one
   or more multicast flows.

   The NAS MAY send this message on its own initiative to support the



Le Faucheur, et al.      Expires April 29, 2010                [Page 21]

Internet-Draft          ANCP Multicast Extensions           October 2009


   NAS initiated Multicast Control use case presented in
   [I-D.ietf-ancp-framework] and summarized in Section 3.1.  In that
   case, the NAS MUST set the Result field to AckAll (0x2) or Nack (0x1)
   according to its requirements.

   The NAS MAY also send this message in response to a Multicast
   Admission Control message (defined in Section 4.4) received from the
   AN to support the conditional access and admission control use case
   presented in [I-D.ietf-ancp-framework] and summarized in Section 3.2.
   In that case, the NAS MUST set the Result field to NAck (0x1).

   In either case, the sender MUST populate the Code field with the
   value 0x000 and the ANCP Transaction Identifier field with a unique
   value, as described in section 5.4.5 of [I-D.ietf-ancp-protocol].

   Each Multicast Replication Control Message MAY contain one or more
   commands, each encapsulated in its own Command TLV.  The sender MUST
   use a separate Command TLV for each distinct multicast flow.

   When the order of processing of two commands does not matter, the
   commands MUST be transmitted in separate Multicast Replication
   Control messages.

   The NAS MAY choose to perform admission control before adding a
   particular flow even if admission control has been enabled on the AN.
   If it does so, it MUST set the R flag in the Command TLV concerned.
   Conversely, if admission control has been enabled on the AN, the NAS
   MAY choose to have the AN do admission control by clearing the R
   flag.

      Note that clearing the R flag causes the AN to allocate resources
      for the flow out of its bandwidth budget as opposed to any
      bandwidth budget managed for the same access line at the NAS.

4.3.2.  Receiver Behaviour

   When successive commands (in the same or different messages) relate
   to the same Target and multicast flow, the state of each feature
   controlled or affected by flags or by optional attributes received in
   the Multicast Replication Control message, SHALL be as set by the
   last command or message referring to that target and flow and
   containing the controlling flag or optional attribute.  As an
   example, successive Multicast Replication Control messages containing
   add commands for a given port and flow, but differing only in the
   accounting flag setting SHALL be interpreted to mean that the state
   of the accounting feature is as set in the final command received,
   but all other features are as set in the initial message.




Le Faucheur, et al.      Expires April 29, 2010                [Page 22]

Internet-Draft          ANCP Multicast Extensions           October 2009


   If more than one Command TLV is present in a Multicast Replication
   Control message, the AN MUST act on the commands in the order in
   which they are presented in the message.  The AN SHALL assign a
   sequence number to each command in a given Multicast Replication
   Control message, starting from 0x01 for the first command.

   If admission control for Multicast Replication Control messages has
   not been enabled (through provisioning of the MRepCtl_CAC TLV, the AN
   MUST ignore the R flag in Command TLVs.  Otherwise, if a Command TLV
   adds a flow, the R flag within the TLV is not set, and the AN is
   performing admission control for Multicast Replication Control
   messages, then the AN MUST perform admission control before
   replicating the flow.  If the admission control check fails, the AN
   MUST treat the failure as an error as described below.  The
   appropriate Code value for the response is 18 (0x012) "Insufficient
   resources".

   If the AN processes the complete Multicast Replication Control
   message successfully and the Result field of the Multicast
   Replication Control message was set to AckAll (0x2), the AN MUST
   respond with a Generic Response message where the Result field is set
   to Success (0x3), the Code field is set to 0x000, and the Transaction
   Identifier field is copied from the Multicast Replication Control
   message.  The body of the response MAY be empty or MAY be copied from
   the Multicast Replication Control message.

   The processing/execution of multiple commands contained in a single
   Multicast Control message MUST be interrupted at the first error
   encountered, and the remaining commands in the Multicast Replication
   Control message discarded.

   If the AN detects an error in a received Multicast Replication
   Control message and the Result field in that message was set to Nack
   (0x1) or AckAll (0x2), the AN MUST generate a Generic Response
   message providing error information to the NAS.  This specification
   identifies the following new Code values beyond those specified in
   [I-D.ietf-ancp-protocol], which MAY be used in a Generic Response
   sent in reply to a Multicast Replication Control message:

   0x100  Command error.  This SHOULD be reported for the following
      cases:

      *  invalid command code;

      *  undefined flag set.






Le Faucheur, et al.      Expires April 29, 2010                [Page 23]

Internet-Draft          ANCP Multicast Extensions           October 2009


   0x101  Bad flow address.  This SHOULD be reported for the following
      cases:

      *  unsupported address family;

      *  unsupported address encoding;

      *  source address present when M flag cleared, or absent when M
         flag set.

   0x102  Multicast flow does not exist.  This SHOULD be reported if the
      NAS attempts to delete a flow that is not enabled.

   A Generic Response message responding to the Multicast Replication
   Control message and containing one of the above Code values MUST
   include a Status-Info TLV which includes one or two sub-TLVs as
   follows:

   o  a Command Number TLV as described in Section 5.2, giving the
      sequence number of the failed command, MUST be included;

   o  the failed Command TLV itself SHOULD be included.

      Note that the Error Message field of the Status-Info TLV MAY be
      used to report more details than implied by the Code value in the
      message header.  For example, the Code value could be 0x101 and
      the Error Message field could contain the text: "Source address
      present when M flag cleared".

4.4.  Multicast Admission Control Message

   This section defines a new message called the Multicast Admission
   Control message.  The Multicast Admission Control message is sent by
   the AN to the NAS to request admission of a multicast flow, or to
   notify of the removal of a multicast flow, for a given target.

   The Message Type for the Multicast Admission Control message is 0x92.

   The ANCP Multicast Admission Control message payload contains two
   TLVs:

   o  Target TLV: The Target TLV is defined in [I-D.ietf-ancp-protocol].
      It MUST appear once and only once in the Multicast Admission
      Control message.  It is encoded as specified in
      [I-D.ietf-ancp-protocol] and identifies the AN port subject to the
      request for admission or release.





Le Faucheur, et al.      Expires April 29, 2010                [Page 24]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  Command TLV: The Command TLV is defined in
      [I-D.ietf-ancp-protocol].  It MUST be present.  If it appears more
      than once, only the first instance is considered meaningful in the
      present version of this specification and the other instances are
      ignored.

   Informative note:

      In the future, the specification of the Admission Control message
      may be extended to allow transport of more than a single directive
      (e.g. to carry both a leave from one group and a join to another
      group for the same Target).  It is expected that this would
      support a similar notion of strict sequenced processing as
      currently defined for handling multiple directives in the
      Multicast Replication Control message whereby all directives
      following the first directive that can not be executed are not
      executed either.  When the strict sequenced processing of the
      directives is not required the directives are distributed across
      separate messages.

4.4.1.  Sender Behaviour

   The AN sending the Multicast Admission Control message MUST set the
   Result field to Ignore (0x0).

   The AN MUST populate the ANCP Transaction Identifier field with a
   unique value, as described in section 5.4.5
   of[I-D.ietf-ancp-protocol] .

   The AN MUST encode the Command TLV as specified in Section 4.3 with
   the following additional rules:

   o  the R flag MUST be set to 0;

   o  the O flag MUST be set to 0;

   o  the Command Code field MUST be set to "0x01 - Add" when the
      message conveys a Join , to "0x02 - Delete" when the message
      conveys a Leave and to "0x03 - Delete All" when the message
      conveys a Leave of all channels (on the target);

   o  The M Flag, Multicast Source Address and Multicast Flow Address of
      the Command TLV identify the multicast flow subject to the request
      for admission or release.  When the Command Code is 0x03, the M
      Flag, Multicast Source address, and Multicast Flow Address are
      meaningless and MUST be set to all zeroes.





Le Faucheur, et al.      Expires April 29, 2010                [Page 25]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  a Request-Source-IP sub-TLV (as defined in Section 5.8) MAY be
      included by the AN to convey the IP address of the sender of the
      join/leave message (e.g.  IGMP/MLD Join/Leave) that triggered the
      AN to include the corresponding Command TLV in the Admission
      Control message.  If it appears more than once, only the first
      instance is considered meaningful and the other instances are
      ignored.

   o  a Request-Source-MAC sub-TLV (as defined in Section 5.9) MAY be
      included by the AN to convey the MAC address of the sender of the
      join/leave message (e.g.  IGMP/MLD Join/Leave) that triggered the
      AN to include the corresponding Command TLV in the Admission
      Control message.  If it appears more than once, only the first
      instance is considered meaningful and the other instances are
      ignored.

4.4.2.  Receiver Behaviour

   On receipt of an Multicast Admission Control message, the NAS:

   o  MUST ignore the Result field;

   o  if the directive in the Multicast Admission Control message is
      "0x02 - Delete" or "0x03 - Delete All" and is processed correctly
      by the NAS, the NAS MUST NOT generate any ANCP message in response
      to the Multicast Admission Control message;

   o  if the directive in the Multicast Admission Control message is
      "0x01 - Add" and is accepted by the NAS, the NAS MUST generate a
      Multicast Replication Control in response to the Multicast
      Admission Control message.  The Multicast Replication Control
      message:

      *  MUST contain a Result set to Nack (0x1);

      *  MUST contain a Transaction ID generated by the NAS (distinct
         non-zero, and linearly incremented by NAS for each request per
         adjacency);

      *  MUST contain the directive as accepted by the NAS.  The R flag
         in the returned Command TLV MUST have value 0 if the NAS
         intends the AN to perform admission control before installing
         the flow, 1 otherwise.  Note that the AN will ignore the R flag
         unless the MRepCtl_CAC TLV has been provisioned on the AN.

   o  if the directive in the Multicast Admission Control message is
      "0x01 - Add", is processed correctly but not accepted by the NAS
      (i.e. it does not pass the admission control or conditional access



Le Faucheur, et al.      Expires April 29, 2010                [Page 26]

Internet-Draft          ANCP Multicast Extensions           October 2009


      check), the NAS MAY generate a Multicast Replication Control
      message in response to the Multicast Admission Control message.
      This optional message can be used by the AN to maintain statistics
      about admission control reject and, in the future, when the
      protocol between the subscriber and the AN allows explicit
      notification of join reject (e.g.
      [I-D.morin-mboned-igmpmld-error-feedback]).  When used in this
      situation, the Multicast Replication Control message:

      *  MUST contain a Result set to 0x00;

      *  MUST contain a Transaction ID generated by the NAS (distinct
         non-zero, and linearly incremented by NAS for each request per
         adjacency);

      *  MUST contain the directive rejected by the NAS (i.e.  Target
         TLV and Command TLV) but with a Command Code set to "0x04 -
         Admission Control Reject", "0x05 - Conditional Access Reject"
         or "0x06 - Admission Control and Conditional Access Reject".

   o  if the Multicast Admission Control message cannot be processed
      correctly by the NAS (e.g. the message is malformed, the multicast
      flow does not exist etc.), the NAS MUST generate a Generic
      Response message (defined in [I-D.ietf-ancp-protocol]) with
      appropriate content indicating the reason for the failure.

4.5.  Bandwidth Reallocation Request Message

   The Bandwidth Reallocation Request message is used when the bandwidth
   delegation capability is included in the negotiated set.  It MAY be
   sent either by the NAS or by the AN to request an adjustment in the
   amount of delegated bandwidth.  It will be sent by the NAS typically
   to reduce the multicast bandwidth allocated to the AN in order for
   the NAS to satisfy a request to add one or more flows.  Conversely,
   the AN will send a Bandwidth Reallocation Request to obtain
   additional bandwidth to satisfy a request to add a multicast channel.
   In each case, the requestor has a minimum requirement for additional
   bandwidth, and MAY ask for additional bandwidth beyond this amount
   (e.g., to handle anticipated future requests).

   The Bandwidth Reallocation Request message contains two TLVs:

   o  the Target TLV (section 5.4.5.1.1 of [I-D.ietf-ancp-protocol]),
      specifying a single access line;

   o  the Bandwidth-Request TLV (Section 5.6), specifying the required
      and preferred amounts of delegated bandwidth.




Le Faucheur, et al.      Expires April 29, 2010                [Page 27]

Internet-Draft          ANCP Multicast Extensions           October 2009


   The Message Type for the Bandwidth Reallocation Request message is
   0x94.

4.5.1.  Sender Behaviour

   The Result field in the header of the Bandwidth Reallocation Request
   message is not used and the sender MUST set it to Ignore (0x0).

   The bandwidth values in the Bandwidth-Request TLV are expressed in
   terms of total multicast bandwidth allocated to the AN.

      The choice of "total bandwidth" rather than "incremental
      bandwidth" was made so that it would be easier for the AN and NAS
      to keep their respective views of the current amount of delegated
      bandwidth synchronized.

   Because the values are totals rather than desired increments/
   decrements, the relationship between the required amount and the
   preferred amount will differ depending on whether the Bandwidth
   Reallocation Request message is issued by the NAS or the AN.

   o  If the NAS is making the request, the preferred amount MUST be
      less than or equal to the required amount.  The required amount
      MUST be less than the currently amount of delegated bandwidth.

   o  If the AN is making the request, the preferred amount MUST be
      greater than or equal to the required amount.  The required amount
      MUST be greater than the currently amount of delegated bandwidth.

4.5.2.  Receiver Behaviour

   When the peer receives a valid Bandwidth Reallocation Request
   message, it SHOULD determine whether it can satisfy the request from
   its existing allocation of unused video bandwidth.  If it decides
   that it can reallocate bandwidth to the peer, it MAY choose to return
   any amount between the required and the preferred amounts indicated
   in the Bandwidth Reallocation Request message.

   The peer MUST return a Bandwidth Transfer message Section 4.6
   indicating its decision.  If the request is met, the Result field of
   the Bandwidth Transfer message MUST be set to Success (0x3), the Code
   field MUST be set to 0x000, and the Bandwidth-Allocation TLV
   (Section 5.3) MUST contain the new value of total multicast
   bandwidth.  This new value MUST lie between the required and
   preferred values, inclusive, from the request message.  If the
   request is not met, the Result field of the Bandwidth Transfer
   message MUST be set to Failure (0x4), the Code field MUST be set to
   0x000, and the Bandwidth Allocation TLV MUST contain the value of the



Le Faucheur, et al.      Expires April 29, 2010                [Page 28]

Internet-Draft          ANCP Multicast Extensions           October 2009


   currently allocated amount of delegated bandwidth as the responder
   views it.

   The following cases indicate that the sender holds a different view
   of the amount of bandwidth from the receiver:

   o  the NAS receives a request where the required amount is less than
      its view of the current amount of delegated bandwidth;

   o  the AN receives a request where the required amount is greater
      than its view of the current amount of delegated bandwidth.

   If one of these cases occurs, the receiver with one exception MUST
   send a Bandwidth Transfer message indicating Success.

   o  If the NAS received the request, the allocated amount in the NAS's
      response MUST be at least equal to NAS's view of the current
      amount of delegated bandwidth.

   o  If the AN received the request, the allocated amount in the AN's
      response MUST be no greater than the AN's view of the current
      amount of delegated bandwidth.

   The exception is when the NAS receives a request while it has a
   request of its own outstanding.  Handling of that case is described
   below.

      While the cases just described are an error condition, the success
      response achieves a graceful recovery.

   To avoid deadlock due to race conditions, the following rules MUST be
   applied:

   a.  If the NAS receives a Bandwidth Reallocation Request message
       while it has a Bandwidth Reallocation Request message of its own
       outstanding for the same access line, the NAS MUST provide an
       immediate failure response to the request from the AN, with a
       Code value set to 0x105 "Bandwidth request conflict".

   b.  If the AN receives a Bandwidth Reallocation Request message while
       it has a Bandwidth Reallocation Request message of its own
       outstanding for the same access line, the AN MUST release any
       bandwidth it has already committed to an outstanding Join request
       while it is awaiting a response from the NAS.  It MUST decide
       upon and send its response to the NAS taking the released
       bandwidth into account.

   If the receiver is unable to process the Bandwidth Reallocation



Le Faucheur, et al.      Expires April 29, 2010                [Page 29]

Internet-Draft          ANCP Multicast Extensions           October 2009


   Request message due to an error, then the receiver MUST return a
   Bandwidth Transfer message where:

   o  the Result field is set to Failure (0x4),

   o  the Code field is set appropriately to indicate the type of error
      that was detected,

   o  the Bandwidth Allocation TLV contains the value of the current
      amount of delegated bandwidth as the responder views it, and

   o  a Status-Info TLV MAY follow the Bandwidth Allocation TLV giving
      further information about the error.

   This specification provides three new Code values applicable
   specifically to the contents of the Bandwidth-Request TLV.  These
   Code values by their nature MUST only be used when the error is being
   reported in a Bandwidth Transfer message rather than a Generic
   Response message.

   0x103  invalid preferred bandwidth amount.  This indicates that the
      preferred and required amounts of bandwidth in the TLV do not have
      the numerical relationship described in the previous section.

   0x104  inconsistent views of delegated bandwidth amount.  This will
      appear only in a Bandwidth Transfer message from the NAS to the AN
      in the case where the NAS has an outstanding Bandwidth
      Reallocation Request.  The recommended procedure for recovery is
      described in Section 4.6.2.

   0x105  bandwidth request conflict.  The NAS has rejected the AN's
      request for more bandwidth because the NAS has an outstanding
      bandwidth request.

4.6.  Bandwidth Transfer Message

   The Bandwidth Transfer message is used to transfer video bandwidth
   from the sender to the peer for a specific access line.  This message
   MAY be sent either from the AN or from the NAS.  As described in the
   previous section, it is the required response to a valid Bandwidth
   Reallocation Request message.

   The Bandwidth Transfer message MAY also be used to transfer bandwidth
   autonomously from one peer to another.  One example of this usage is
   to release bandwidth borrowed earlier by means of the Bandwidth
   Reallocation Request message.  When the message is used in this way,
   the Result field in the Bandwidth Transfer message MUST be set to
   Ignore (0x0).



Le Faucheur, et al.      Expires April 29, 2010                [Page 30]

Internet-Draft          ANCP Multicast Extensions           October 2009


      This allows the receiver to distinguish between an autonomous
      transfer and a response to a previous Bandwidth Reallocation
      Request, for purposes of validation.

   The Message Type for the Bandwidth Transfer message is 0x95.  The
   Bandwidth Transfer message contains the following TLVs:

   o  the Target TLV, designating the access line concerned;

   o  an instance of the Bandwidth-Allocation TLV (Section 5.3).  The
      bandwidth value in the Bandwidth-Allocation TLV is the new amount
      of delegated bandwidth allocated to the target.

4.6.1.  Sender Behaviour

   When sending a Bandwidth Transfer message where the Result value is
   Ignore (0x0) or Success (0x3), the following relationships MUST hold:

   o  if the message is sent by the NAS, the bandwidth value in the
      Bandwidth-Allocation TLV MUST be greater than or equal to the
      sender's view of the current amount of delegated bandwidth for the
      access line concerned;

   o  if the message is sent by the AN, the bandwidth value in the
      Bandwidth-Allocation TLV MUST be less than or equal to the
      sender's view of the current amount of delegated bandwidth for the
      access line concerned.

   Further sender behaviour is specified above, in Section 4.5.2.

4.6.2.  Receiver Behaviour

4.6.2.1.  Behaviour of the NAS

   If the amount of delegated bandwidth provided in the Bandwidth-
   Allocation TLV is not greater than the NAS's view of the current
   amount of delegated bandwidth, the NAS MUST update its view of the
   current amount of delegated bandwidth to the amount indicated in the
   Bandwidth Transfer message.  This is required regardless of whether
   the Result field of that message indicates Success or Failure.

   If the amount of delegated bandwidth provided in the Bandwidth-
   Allocation TLV is greater than the NAS's view of the current amount
   of delegated bandwidth, the NAS MAY accept the given value as its new
   value of delegated bandwidth.  Alternatively, the NAS MAY force the
   AN to modify its view of the amount of delegated bandwidth to that
   held by the NAS, by sending a Port Management message for the target
   access line concerned, containing a Bandwidth-Allocation TLV with a



Le Faucheur, et al.      Expires April 29, 2010                [Page 31]

Internet-Draft          ANCP Multicast Extensions           October 2009


   value equal to the amount of delegated bandwidth the NAS wishes to
   enforce.

4.6.2.2.  Behaviour of the AN

   If the amount of delegated bandwidth provided in the Bandwidth-
   Allocation TLV of the Bandwidth Transfer message differs from the
   AN's view of the current amount of delegated bandwidth, the AN MUST
   update its view of the current amount of delegated bandwidth to the
   amount indicated in the Bandwidth Transfer message.  This is required
   with the exception of a Bandwidth Transfer message with a Result
   field equal to Failure (0x4) and a Code field equal to 0x104
   "Inconsistent views of delegated bandwidth amount" or 0x105
   "Bandwidth request conflict".  If Code value 0x104 is received, the
   AN MUST issue a Delegated Bandwidth Query Request message to
   determine the NAS's current view of the amount of delegated
   bandwidth.  The AN MUST update its own view based on the value
   returned in the Delegated Bandwidth Query Response.  If Code value
   0x105 is received, the AN SHOULD carry out this procedure unless it
   can account for the discrepancy as a result of a transfer of
   bandwidth to the NAS that was carried out just before the incoming
   Bandwidth Transfer message was processed.

      The two Code values indicate a race condition where the AN may
      have just completed a transfer of bandwidth to the NAS.  As a
      result, the value given in the Bandwidth Transfer message may be
      outdated, and the AN needs to query the NAS to find its latest
      view.  The procedure assumes that ordering is preserved between
      the Bandwidth Transfer message sent by the AN in response to the
      NAS's request and the subsequent Delegated Bandwidth Query Request
      message.

   If as the result of the procedures just described the AN determines
   that it has over-committed multicast bandwidth, it MUST NOT terminate
   any currently-active programs, but MUST NOT honour any more "join"
   requests until it is possible to do so within the limit set by its
   current value of delegated bandwidth.

4.7.  Delegated Bandwidth Query Request Message

   The Message Type for the Delegated Bandwidth Query Request (and
   Response) messages is 0x96.

   The Delegated Bandwidth Query Request message MAY be sent either by
   the NAS or by the AN to retrieve the peer's view of the amount of
   delegated bandwidth.  The request contains one TLV:





Le Faucheur, et al.      Expires April 29, 2010                [Page 32]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  a Target TLV designating the access line for which the information
      is requested.

4.7.1.  Sender Behaviour

   The sender MUST set the Result field in the header of the Delegated
   Bandwidth Query Request message to AckAll (0x2).  The Code value MUST
   be set to 0x000.  The sender MUST populate the ANCP Transaction
   Identifier field with a unique value, as described in section 5.4.5
   of [I-D.ietf-ancp-protocol].

4.7.2.  Receiver Behaviour

   If the AN or NAS receives a valid Delegated Bandwidth Query Request
   message, it MUST respond with a Delegated Bandwidth Query Response
   message.  The Result field in the header of the response MUST be set
   to Success (0x3).  The Code field MUST be set to 0x000.  The
   Transaction-Id field MUST be copied from the request message.  The
   body of the response MUST contain the Target TLV, copied from the
   request message.  Finally, the body of the response MUST contain a
   Bandwidth-Allocation TLV, containing the current amount of delegated
   bandwidth from the point of view of the receiver of the request.

   If the contents of the Delegated Bandwidth Query Request message are
   in error, the receiver MUST return a Delegated Bandwidth Query
   Response message with the Result field in the header set to Failure
   (0x3).  The Code field MUST be set to the value that indicates the
   nature of the error (e.g., 0x004 "Unrecognized target").  The
   Transaction-Id field MUST be copied from the request.  The body of
   the response MUST contain the Target TLV copied from the request.
   This MAY be followed by a Status-Info TLV giving further infromation
   about the error.

4.8.  Delegated Bandwidth Query Response Message

   The Delegated Bandwidth Query Response message is sent in reply to a
   Delegated Bandwidth Query Request.  The response to a valid request
   contains two TLVs:

   o  the Target TLV, copied from the request;

   o  a Bandwidth-Allocation TLV, giving the responder's view of the
      current amount of multicast bandwidth delegated to the AN.

   The Message Type for the Delegated Bandwidth Query Response message
   is 0x96.





Le Faucheur, et al.      Expires April 29, 2010                [Page 33]

Internet-Draft          ANCP Multicast Extensions           October 2009


4.8.1.  Sender Behaviour

   Sender behaviour for the Delegated Bandwidth Query Response message
   is specified in Section 4.7.2.

4.8.2.  Receiver Behaviour

   If the Delegated Bandwidth Query Response message indicates Success
   (0x3), the following actions apply.

4.8.2.1.  Behaviour at the NAS

   If the amount of delegated bandwidth provided in the Bandwidth-
   Allocation TLV is less than the NAS's view of the current amount of
   delegated bandwidth, the NAS MUST update its view of the current
   amount of delegated bandwidth to the amount indicated in the
   Delegated Bandwidth Query Response message.

   If the amount of delegated bandwidth provided in the Bandwidth-
   Allocation TLV is greater than the NAS's view of the current amount
   of delegated bandwidth, the NAS MAY accept the given value as its new
   value of delegated bandwidth.  Alternatively, the NAS MAY force the
   AN to modify its view of the amount of delegated bandwidth to that
   held by the NAS, by sending a Port Management message for the target
   access line concerned, containing a Bandwidth-Allocation TLV with a
   value equal to the amount of delegated bandwidth the NAS wishes to
   enforce.

4.8.2.2.  Behaviour at the AN

   The AN SHOULD accept the value returned in the Bandwidth- Allocation
   TLV of the Delegated Bandwidth Query Response message as the correct
   value of the current amount of delegated bandwidth.  If the AN has
   currently committed more than this amount to active programs, it MUST
   NOT cease replicating the flows concerned, but MUST NOT honour any
   more Join requests until possible to do so within the new limit.

      A race condition is possible, where the AN sends a query, the NAS
      requests more bandwidth, then receives and responds to the query,
      then receives the Bandwidth Transfer message responding to its
      request.  It is up to the AN to take appropriate action in this
      case.  The best action appears to be not to act on the result of
      the first query, but to repeat the query after sending the
      Bandwidth Transfer message.  Similar considerations apply to a
      race between queries from both sides.






Le Faucheur, et al.      Expires April 29, 2010                [Page 34]

Internet-Draft          ANCP Multicast Extensions           October 2009


4.9.  Multicast Flow Query Request and Response Messages

   This section defines two new messages called the Multicast Flow Query
   Request and Multicast Flow Query Response.  The Multicast Flow Query
   Request is sent by the NAS to request information about the multicast
   flows that are active on the AN.  The Multicast Flow Query Response
   is sent in response by the AN to provide the requested information to
   the NAS.

   The Message Type for the Multicast Flow Query Request and Multicast
   Flow Query Response messages is 0x97.

   The contents of the Multicast Flow Query Request and Response depend
   on the nature of the query, as described below.

4.9.1.  Sender Behaviour

   The sender of a Multicast Flow Query Request message MUST set the
   Result field to AckAll (0x2).  The Code field MUST be set to 0x000.
   The sender MUST populate the ANCP Transaction Identifier field with a
   unique value, as described in section 5.4.5 of [I-D.ietf-ancp-
   protocol].

   The Multicast Flow Query Request MAY be used by the NAS to retrieve:

   o  the AN's view of which multicast flows are currently active on a
      specified set of access ports; or

   o  the AN's view of the access ports on which a specified set of
      multicast flows are currently active; or

   o  the AN's view of all the multicast flows currently active on each
      and every port of the AN.

   To retrieve the AN's view of which multicast flows are currently
   active on one (or multiple) given port(s) of the AN, the Multicast
   Flow Query Request payload MUST contain the following TLVs:

   o  Target TLV.  It MUST appear at least once.  Each occurence
      identifies one AN port for which information on active multicast
      flows is queried.  It is encoded as specified in
      [I-D.ietf-ancp-protocol].

   To retrieve the AN's view of which ports one (or multiple) given
   multicast flow(s) is (are) currently active on, the Multicast Flow
   Query Request payload MUST contain the following TLVs:





Le Faucheur, et al.      Expires April 29, 2010                [Page 35]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  Multicast-Flow TLV.  It MUST appear at least once.  Each occurence
      identifies one multicast flow for which information is queried.
      It is encoded as specified in Section 5.10.

   To retrieve the AN's view of all the multicast flows currently active
   on each port of the AN, the Multicast Flow Query Request payload MUST
   NOT contain any instance of the Target TLV or the Multicast-Flow TLV.

4.9.2.  Receiver Behaviour

   The AN MUST respond to a Multicast Flow Query Request message that
   has a valid format and a valid content with a Multicast Flow Query
   Response message.  The Result field in the response MUST be set to
   Success (0x3).  The Code field MUST be set to 0x000.  The
   Transaction-Id field MUST be copied from the request.

   If the Multicast Flow Query Request contained one (or more) Target
   TLVs, the AN MUST include, for each of these Target TLVs, the
   following set of TLVs:

   o  Target TLV.  This MUST be identical to the Target TLV in the
      received Multicast Flow Query Request message.

   o  Multicast-Flow TLV(s).  The Multicast-Flow TLV MUST appear once
      per multicast flow that is currently active on the AN port
      identified in the preceding Target TLV.

   The Target TLVs MUST appear in the response from the AN in the same
   order as in the query from the NAS.

   If the Multicast Flow Query Request contained one (or more)
   Multicast-Flow TLVs, the AN MUST include, for each of these
   Multicast-Flow TLVs, the following set of TLVs:

   o  Multicast-Flow TLV.This MUST be identical to the Target TLV in the
      received Multicast Flow Query Request message.

   o  Target TLV(s).  The Target TLV MUST appear once per AN port on
      which the multicast flow identified in the preceding Multicast
      Flow TLV is active.

   The Multicast-Flow TLVs MUST appear in the response from the AN in
   the same order as in the query from the NAS.

   If the Multicast Flow Query Request contained no Target TLV and no
   Multicast Flow TLV, the AN MUST include, for each AN port, the
   following set of TLVs:




Le Faucheur, et al.      Expires April 29, 2010                [Page 36]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  Target TLV.  This MUST identify one AN port.

   o  Multicast-Flow TLV(s).  The Multicast-Flow TLV MUST appear once
      per Multicast Flow that is currently active on the AN port
      identified in the preceding Target TLV.

   If the contents of the Multicast Flow Query Request are in error, the
   AN MUST reply with a Multicast Flow Query Response message with the
   Result field set to Failure (0x4) and the Code field set to indicate
   the nature of the error.  If the request contained multiple instances
   of the Target TLV or the Multicast-Flow TLV and one of these is in
   error, the response message MUST contain the results for the
   preceding instances of the TLV as if there had been no error.  These
   successful results MUST be followed by the TLV in error, copied from
   the request.  The AN MUST NOT do further processing of the request.
   The AN MAY add a Status-Info TLV to provide further information on
   the nature of the error.


































Le Faucheur, et al.      Expires April 29, 2010                [Page 37]

Internet-Draft          ANCP Multicast Extensions           October 2009


5.  ANCP TLVs and Sub-TLVs

   This section defines new ANCP TLVs and sub-TLVs or extends existing
   ones.

5.1.  Multicast-Service-Profile TLV

   This document defines the new Multicast-Service-Profile TLV.

   The Multicast-Service-Profile TLV MAY be included in a Provisioning
   message as specified in Section 4.1.

   The Multicast-Service-Profile is illustrated in Figure 6.  It
   consists of a TLV header, a Multicast-Service-Profile-Name sub-TLV,
   and one or more List-Action sub-TLVs.  The sub-TLVs are packed
   consecutively with no intervening padding.

                            1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |TLV Type = Mcast Service Profile |             TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Multicast-Service-Profile-Name Sub-TLV                      |
       |   Sub-TLV type = 0x01                                         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   List-Action Sub-TLV                                         |
       |   Sub-TLV type = 0x02                                         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                          ...                                  |
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   List-Action Sub-TLV                                         |
       |   Sub-TLV type = 0x02                                         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                  Figure 6: Multicast-Servive-Profile TLV

   Multicast Service Profile TLV Type:

             TLV (0x13) : indicating that this is a Multicast Service
             Profile TLV

   The Multicast-Service-Profile-Name sub-TLV is shown in Figure 7.  It
   consists of an eight-bit sub-TLV identifier with value 0x01, an
   eight-bit length field, and an identifier.  The length field gives
   the length of the identifier in octets.  The identifier consists of
   an opaque sequence of octets used to refer to the profile when



Le Faucheur, et al.      Expires April 29, 2010                [Page 38]

Internet-Draft          ANCP Multicast Extensions           October 2009


   activating it for a given target within a Port Management message
   (see Section 4.2).  The identifier MUST be unique over all profiles
   provisioned to the same AN partition.

        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Type = 0x01   |  Length       |   Identifier ...
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

             Figure 7: Multicast-Service-Profile-Name sub-TLV

   The List-Action sub-TLV is shown in Figure 8.  It consists of an
   eight-bit sub-TLV identifier with value 0x02, a four-bit action
   field, a four-bit list type field, a sixteen-bit length, and a
   sequence of multicast flow fields organized by address family.
   Either an IPv4 list or an IPv6 list or both MAY be present in the
   sub-TLV.

                            1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Type = 0x02   | Oper  | LType |          Length               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | IP Version                    |          List Length          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    Multicast flow fields                      |
                                 ......
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | IP Version                    |          List Length          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    Multicast flow fields                      |
                                 ......
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                       Figure 8: List-Action Sub-TLV

   The fields within the List-Action TLV are defined as follows:

   Type:  always 0x02.

   Oper:  operation to be performed.  The possible values are Add (0x1),
      Delete (0x2), or Replace (0x3).  The operation indicates whether
      the listed multicast flows are to be added to the list identified
      by the list type field within the profile identified by the
      Multicast-Service-Profile-Name sub-TLV, deleted from that list, or
      whether the listed flows should replace the current contents of



Le Faucheur, et al.      Expires April 29, 2010                [Page 39]

Internet-Draft          ANCP Multicast Extensions           October 2009


      the identified list.

   Ltype:  the list type being modified by this list action.  The
      possible values are White (0x1), Black (0x2), or Grey (0x3).

   Length:  the length (in octets) of the contents of the List-Action
      sub-TLV following the Length field itself.

   IP Version:  the IP version of the set of multicast flow fields that
      follow.  Possible values are 0x0000 (IPv4) or 0x0001 (IPv6).  As
      indicated above, either an IPv4 list or an IPv6 list or both MAY
      be present in the sub-TLV.

   List length:  the length (in octets) of the list of multicast flow
      fields following the list length field.

   Multicast flow field:  a field identifying one or more multicast
      flows.  It consists of an 8-bit group address prefix length, an
      8-bit source address prefix length, a 0-16 octet group prefix, and
      a 0-16 octet source prefix, as shown in Figure 9.

   Each multicast flow field refers either to a Single Source Multicast
   (SSM) channel or to an Any Source Multicast (ASM) group.  The scope
   of the designation may be broadened to multiple channels or groups
   through use of prefix length values smaller than the total address
   length for the given address family.  Multicast flow fields MUST be
   placed consecutively within the sub-TLV without intervening padding
   except to round out individual addresses to the nearest octet
   boundary.

   A multicast flow field consists of two single-octet prefix lengths
   followed by zero to two prefix values as shown in Figure 9:

       +-+-+-+-+-+-+-+-+
       | Group PrefLen |
       +-+-+-+-+-+-+-+-+
       | Source PrefLen|
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Group Prefix (multicast)  (0 to 16 octets)                  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Source Prefix (unicast, SSM only) (0 to 16 octets)          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


          Figure 9: Organization of a Single Multicast Flow Field

   The prefix length has its usual meaning.  It is the number of most-
   significant bits specified within the corresponding prefix.  The



Le Faucheur, et al.      Expires April 29, 2010                [Page 40]

Internet-Draft          ANCP Multicast Extensions           October 2009


   prefix length MAY vary from 0 to 32 in the IPv4 sub-list, and from 0
   to 128 in the IPv6 sub-list.

   A value of 0x00 for either the Group PrefLen (prefix length) or the
   Source PrefLen indicates that any value of the corresponding address
   will match (wild card).  If the value 0x00 is provided for a
   particular prefix length, the corresponding prefix MUST be omitted
   from the field contents.  In particular, a value of 0x00 for the
   Source PrefLen indicates an ASM multicast entry, and the Source
   Prefix will be absent.

   The length of a Source or Group Prefix field is equal to (PrefLen +
   7)/8 octets, truncated to the nearest integer.  Unused bits at the
   end of the prefix MUST be set to zeroes.

5.2.  Command Number TLV

   The Command Number TLV conveys the sequence number of a specific
   command within a Multicast Replication Control or Multicast Admission
   Request message.  Within this specification, the Command Number TLV
   itself is used as a sub-TLV within a Status-Info TLV, in a Generic
   Response reporting a failed command.

   The Command TLV has the format shown in Figure 10.  The sequnce
   number field is the sequence number of a specific command within a
   request, where numbering starts from 1 for the first command.

        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |TLV Type = Command Number      |          TLV Length = 2       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Sequence number              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


              Figure 10: Structure of the Command Number TLV

5.3.  Bandwidth-Allocation TLV

   The Bandwidth-Allocation TLV is used to indicate the total amount of
   video bandwidth delegated to the AN for multicast admission control
   for a given access line, in kilobits per second.  The TLV has the
   format shown in Figure 11.  The TLV Type for the Bandwidth-Allocation
   TLV is 0x15.







Le Faucheur, et al.      Expires April 29, 2010                [Page 41]

Internet-Draft          ANCP Multicast Extensions           October 2009


        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |TLV Type = BW-Allocation       |          TLV Length = 4       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |          Delegated amount (kbits/s)                           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                  Figure 11: The Bandwidth-Allocation TLV

5.4.  White-List-CAC TLV

   The White-List-CAC TLV is used to indicate that the NAS wishes the AN
   to do admission control for White-listed flows.  Details on when the
   White-List-CAC TLV may be provisioned are specified in Section 6.

   The White-List-CAC TLV contains no data, thus its TLV Length field
   MUST have value 0.

5.5.  MRepCtl-CAC TLV

   The MRepCtl-CAC TLV is used to indicate that the NAS wishes the AN to
   do admission control for flows added by the Multicast Replication
   Control message.  Details on when the MRepCtl-CAC TLV may be
   provisioned are specified in Section 6.

   The MRepCtl-CAC TLV contains no data, thus its TLV Length field MUST
   have value 0.

5.6.  Bandwidth-Request TLV

   The Bandwidth-Request TLV is used to request an adjustment of the
   total amount of video bandwidth allocated to the AN for multicast
   admission control for a given line.  The "Required amount" field
   indicates the minimum adjustment required to meet the request.  The
   "Preferred amount" field indicates the adjustment the requestor would
   prefer to have, if possible.  Section 4.5 discusses the required
   relationships between the "Required amount", "Preferred amount", and
   current values of total bandwidth allocated to the AN.

   The Bandwidth-Request TLV has the format shown in Figure 12.  The TLV
   Type for the Bandwidth-Request TLV is 0x16.










Le Faucheur, et al.      Expires April 29, 2010                [Page 42]

Internet-Draft          ANCP Multicast Extensions           October 2009


        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |TLV Type = 0x16              |            TLV Length = 8       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           Required amount  (kbits/s)                          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           Preferred amount (kbits/s)                          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                   Figure 12: The Bandwidth-Request TLV

5.7.  Multicast-Service-Profile-Name TLV

   The Multicast-Service-Profile-Name TLV carries the identifier of a
   multicast service profile provisioned on the AN.

   o  Type (Multicast-Service-Profile-Name = 0x18): Reference to a
      multicast service profile on the AN, that defines a White, Black,
      and/or Grey List depending on the set of negotiated capabilities.

   o  Length : (up to 255 octets)

   o  Value : opaque sequence of octets identifying a specific profile.
      This MUST match one of the multicast service profile names
      provisioned on the AN in a Provisioning message or by other means.

5.8.  Request-Source-IP sub-TLV

   [I-D.ietf-ancp-protocol] defines the Command TLV that can be used in
   a Multicast Replication Control message and (as defined in this
   document) in the Admission Control message.  The Command TLV MAY
   include sub-TLVs immediately following the Command Info field.

   This document defines the new Request-Source-IP sub-TLV.

   The Request-Source-IP sub-TLV MAY be included in a Command TLV inside
   an Admission Control message.

   The Request-Source-IP sub-TLV is illustrated below:


        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |sub-TLV Type = Request-Source-IP | Request-S-IP sub-TLV Length |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Addr Family   | Encoding Type   |   Unicast Address           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




Le Faucheur, et al.      Expires April 29, 2010                [Page 43]

Internet-Draft          ANCP Multicast Extensions           October 2009


   Request-Source-IP sub-TLV Type:

             sub-TLV (0x92) indicating the contents to be a Request-
             Source-IP sub-TLV.

   Request-Source-IP sub-TLV Length:

             Combined length in bytes of the data inside sub-TLV.
             Excludes the sub-TLV Header.

   Address Family, Encoding type and Unicast Address:

             Contains the IP address of the sender of the join/leave
             message (e.g.  IGMP/MLD Join/Leave) that triggered the AN
             to include the corresponding Command TLV in an Admission
             Control message.  The IP address is encoded as per
             [IANAAEA].

5.9.  Request-Source-MAC sub-TLV

   This document defines the new Request-Source-MAC sub-TLV.

   The Request-Source-MAC sub-TLV MAY be included in a Command TLV
   inside an Admission Control message.

   The Request-Source-MAC sub-TLV is illustrated below:


        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |sub-TLV Type=Request-Source-MAC  |Request-S-MAC sub-TLV Length |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  TBD                                                          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Request-Source-MAC sub-TLV Type:

             sub-TLV (0x93) indicating the contents to be a Request-
             Source-MAC sub-TLV.

   Request-Source-MAC sub- TLV Length:

             Combined length in bytes of the data inside sub-TLV.
             Excludes the sub-TLV Header.

   TBD:




Le Faucheur, et al.      Expires April 29, 2010                [Page 44]

Internet-Draft          ANCP Multicast Extensions           October 2009


             Contains the IEEE MAC address of the sender of the join/
             leave message (e.g.  IGMP/MLD Join/Leave) that triggered
             the AN to include the corresponding Command TLV in an
             Admission Control message.  The IP address is encoded as
             per TBD.

5.10.  Multicast-Flow TLV

   This document defines the new Multicast-Flow TLV.

   The Multicast-Flow TLV MAY be included in a Multicast Flow Query
   Request or Response message as specified in Section 4.9.

   The Multicast-Flow TLV is illustrated below:

        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |TLV Type = Multicast-Flow      |          TLV Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Addr Family   | Encoding Type | Multicast Flow Source Address |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Multicast Flow Source Address (Cont'd)  ...                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Addr Family   | Encoding Type | Multicast Flow Group Address  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Multicast Flow Group Address (Cont'd)  ...                    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  ...                          | Padding to 32-bit boundary    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                            Multicast-Flow TLV

   Multicast-Flow TLV Type:

             TLV (0x19) : indicating that this is a Multicast-Flow TLV

   Multicast-Flow TLV Length:

             Length in bytes of the Value field of the TLV.  Excludes
             the TLV Header (Type and Length).

   Addr Family, Encoding Type, Multicast Flow Source Address, Multicast
   Flow Group Address and Padding are encoded as specified for the
   corresponding field of the Command TLV in Section 4.3.






Le Faucheur, et al.      Expires April 29, 2010                [Page 45]

Internet-Draft          ANCP Multicast Extensions           October 2009


6.  Multicast Capabilities

   Section 5.3 of [I-D.ietf-ancp-protocol] defines a capability
   negotiation mechanism as well as a number of capabilities.  This
   section defines four new capabilities in support of different modes
   of multicast operation:

   o  NAS-initiated replication (capability type 0x05);

   o  conditional access with white and black lists (capability type
      0x06);

   o  conditional access with grey lists (capability type 0x07);

   o  bandwidth delegation (capability type 0x08).

   The "Capability Data" field within the Capability TLV for all of
   these capabilities is empty.

   The remainder of this section consists of three sub-sections.
   Section 6.1 specifies the protocol elements that must be implemented
   in order to support each capability.  Section 6.2 specifies the
   procedures that apply to each capability on its own.  Section 6.3
   specifies how the capabilities interact if more than one multicast
   capability is included in the set of capabilities negotiated between
   the AN and the NAS.

   Note that if a request contains content that is not supported
   (according to the tables in Section 6.1) by the negotiated set of
   multicast capabilities, the appropriate response is to return a
   Generic Response message indicating Failure (0x4) with an appropriate
   code value (e.g., 0x84 "TLV or value not supported by negotiated
   capability set").  The body of the message MUST contain a Status-Info
   TLV.  See Sections 5.4.5.1 and 5.4.5.2 in [I-D.ietf-ancp-protocol]
   for more details.

6.1.  Required Protocol Support

   This section specifies the protocol elements that must be implemented
   to support each of the four multicast capabilities.  Support of
   multiple multicast capabilities requires implementation of the union
   of the sets of protocol elements applying to each of the individual
   capabilities in the supported set.

6.1.1.  Protocol Requirements For NAS-initiated Replication

   Table 1 specifies the protocol elements within Section 4 and
   Section 5 that must be implemented to support the NAS-initiated



Le Faucheur, et al.      Expires April 29, 2010                [Page 46]

Internet-Draft          ANCP Multicast Extensions           October 2009


   replication multicast capability.

   +--------------+----------------------------------------------------+
   | Reference    | Protocol Element                                   |
   +--------------+----------------------------------------------------+
   | Section 4.1  | Provisioning message with MRepCtl_CAC TLV          |
   |              |                                                    |
   | Section 4.2  | Port Management message with Bandwidth-Allocation  |
   |              | TLV.                                               |
   |              |                                                    |
   | Section 4.3  | Multicast Replication Control message              |
   |              |                                                    |
   | Section 4.9  | Multicast Flow Query Request and Response messages |
   |              |                                                    |
   | Section 5.2  | Command Number TLV                                 |
   |              |                                                    |
   | Section 5.5  | MRepCtl-CAC TLV                                    |
   |              |                                                    |
   | Section 5.10 | Multicast-Flow TLV                                 |
   +--------------+----------------------------------------------------+

   Table 1: Protocol Support Requirements For NAS-initiated Replication

6.1.2.  Protocol requirements For Conditional Access With White and
        Black Lists

   Table 2 specifies the protocol elements within Section 4 and
   Section 5 that must be implemented to support the conditional access
   with white and black lists multicast capability.






















Le Faucheur, et al.      Expires April 29, 2010                [Page 47]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +--------------+----------------------------------------------------+
   | Reference    | Protocol Element                                   |
   +--------------+----------------------------------------------------+
   | Section 4.1  | Provisioning message with                          |
   |              | Multicast-Service-Profile TLV, White and Black     |
   |              | lists only, and White-List-CAC TLV                 |
   |              |                                                    |
   | Section 4.2  | Port Management message with                       |
   |              | Multicast-Service-Profile-Name and                 |
   |              | Bandwidth-Allocation TLVs.                         |
   |              |                                                    |
   | Section 4.9  | Multicast Flow Query Request and Response messages |
   |              |                                                    |
   | Section 5.1  | Multicast-Service-Profile TLV, White and Black     |
   |              | lists only                                         |
   |              |                                                    |
   | Section 5.3  | Bandwidth-Allocation TLV                           |
   |              |                                                    |
   | Section 5.4  | White-List-CAC TLV                                 |
   |              |                                                    |
   | Section 5.7  | Multicast-Service-Profile-Name TLV                 |
   |              |                                                    |
   | Section 5.10 | Multicast-Flow TLV                                 |
   +--------------+----------------------------------------------------+

    Table 2: Protocol Support Requirements For Conditional Access with
                           White and Black Lists

6.1.3.  Protocol requirements For Conditional Access With Grey Lists

   Table 3 specifies the protocol elements within Section 4 and
   Section 5 that must be implemented to support the conditional access
   with grey lists multicast capability.


















Le Faucheur, et al.      Expires April 29, 2010                [Page 48]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +--------------+----------------------------------------------------+
   | Reference    | Protocol Element                                   |
   +--------------+----------------------------------------------------+
   | Section 4.1  | Provisioning message with                          |
   |              | Multicast-Service-Profile TLV, Grey lists only,    |
   |              | and MRepCtl_CAC TLV                                |
   |              |                                                    |
   | Section 4.2  | Port Management message with                       |
   |              | Multicast-Service-Profile-Name and                 |
   |              | Bandwidth-Allocation TLVs.                         |
   |              |                                                    |
   | Section 4.3  | Multicast Replication Control message              |
   |              |                                                    |
   | Section 4.4  | Multicast Admission Control Message                |
   |              |                                                    |
   | Section 4.9  | Multicast Flow Query Request and Response messages |
   |              |                                                    |
   | Section 5.1  | Multicast-Service-Profile TLV, Grey lists only     |
   |              |                                                    |
   | Section 5.2  | Command Number TLV                                 |
   |              |                                                    |
   | Section 5.3  | Bandwidth-Allocation TLV                           |
   |              |                                                    |
   | Section 5.5  | MRepCtl-CAC TLV                                    |
   |              |                                                    |
   | Section 5.7  | Multicast-Service-Profile-Name TLV                 |
   |              |                                                    |
   | Section 5.8  | Request-Source-IP sub-TLV                          |
   |              |                                                    |
   | Section 5.9  | Request-Source-MAC sub-TLV                         |
   |              |                                                    |
   | Section 5.10 | Multicast-Flow TLV                                 |
   +--------------+----------------------------------------------------+

    Table 3: Protocol Support Requirements For Conditional Access with
                                Grey Lists

6.1.4.  Protocol requirements For Delegated Bandwidth

   Table 4 specifies the protocol elements within Section 4 and
   Section 5 that must be implemented to support the delegated bandwidth
   multicast capability.









Le Faucheur, et al.      Expires April 29, 2010                [Page 49]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +--------------+----------------------------------------------------+
   | Reference    | Protocol Element                                   |
   +--------------+----------------------------------------------------+
   | Section 4.2  | Port Management message with Bandwidth-Allocation  |
   |              | TLV.                                               |
   |              |                                                    |
   | Section 4.5  | Bandwidth Reallocation Request Message             |
   |              |                                                    |
   | Section 4.6  | Bandwidth Transfer Message                         |
   |              |                                                    |
   | Section 4.7  | Delegated Bandwidth Query Request Message          |
   |              |                                                    |
   | Section 4.8  | Delegated Bandwidth Query Response Message         |
   |              |                                                    |
   | Section 4.9  | Multicast Flow Query Request and Response messages |
   |              |                                                    |
   | Section 5.3  | Bandwidth-Allocation TLV                           |
   |              |                                                    |
   | Section 5.6  | Bandwidth-Request TLV                              |
   |              |                                                    |
   | Section 5.10 | Multicast-Flow TLV                                 |
   +--------------+----------------------------------------------------+

      Table 4: Protocol Support Requirements For Delegated Bandwidth

6.2.  Capability-Specific Procedures for Providing Multicast Service

   This section describes multicast service procedures for each
   capability as if it were the only multicast capability within the
   negotiated set.  Procedures involving combinations of multicast
   capabilities are described in Section 6.3.

   The use of the Multicast Flow Query Request and Response messages to
   determine the association between multicast flows and ports is common
   to all multicast capabilities.  No additional text is required here,
   beyond that already given in Section 4.9 to describe the use of those
   messages.

6.2.1.  Procedures For NAS-initiated Replication

   NAS-initiated replication MAY be negotiated to support a mode of
   operation where IGMP/MLD requests are terminated on the NAS.
   Alternatively, it MAY be negotiated to allow the NAS to respond to
   requests sent by other means (e.g., through application signalling)
   that require the replication of multicast channels to a given access
   line.

   The NAS MAY enable admission control at the AN for Nas-initiated



Le Faucheur, et al.      Expires April 29, 2010                [Page 50]

Internet-Draft          ANCP Multicast Extensions           October 2009


   replication.  To do this, it MUST include the MRepCtl-CAC TLV in a
   Provisioning message sent to the AN.  It MUST also include a
   Bandwidth-Allocation TLV in a Port Management message for each access
   line.

   The procedures associated with NAS-initiated replication are
   straightforward.  To initiate replication, the NAS MUST send a
   Multicast Replication Control message to the AN, containing one or
   more commands adding flows, as described in section ReplicSend.  If
   it does admission control itself, it MUST set the R flag in the Add
   commands.  If it has enabled admission control in the AN and wishes
   the AN to perform admission control for the flows, it MUST clear the
   R flag in the Command TLV requesting the flow addition.  To terminate
   replication the NAS MUST send a a Multicast Replication Control
   message where the commands delete instead of adding them flows.

6.2.2.  Procedures For Conditional Access With Black and White Lists

6.2.2.1.  Provisioning

   The NAS provisions named multicast service profiles containing White
   and Black lists on the AN using the Provisioning message containing
   one or more Multicast-Service-Profile TLVs.  The NAS MAY update the
   contents of these profiles from time to time as required, by sending
   additional Provisioning messages with Multicast-Service-Profile TLVs
   containing incremental modifications to the existing White and Black
   lists or replacements for them.

   The NAS assigns a specific multicast service profile to an individual
   access line using the Port Management message containing a Multicast-
   Service-Profile-Name TLV.

   The NAS MAY choose to enable admission control at the AN for White-
   listed flows.  To do this, it MUST send a Provisioning message as
   described in section provisioning, which includes the White-List-CAC
   TLV.  It MUST also provide a multicast bandwidth allocation for each
   access line by including a Bandwidth-Allocation TLV in a Port
   Management message.

6.2.2.2.  Multicast Service Procedures

   The conditional access with White and Black lists capability assumes
   that IGMP/MLD requests are terminated on the AN.  When the AN
   receives a "join" request, it MUST check to see whether the requested
   flow is White-listed or Black-listed as described below.  Requests
   for Black-listed flows MUST be discarded.  If the NAS has enabled
   admission control on the given access line as described in the
   previous section, but the flow would cause the amount of committed



Le Faucheur, et al.      Expires April 29, 2010                [Page 51]

Internet-Draft          ANCP Multicast Extensions           October 2009


   multicast bandwidth to exceed the provisioned limit, the request MUST
   be discarded.  Flows passing these checks are replicated to the
   access line.

   To determine if a requested flow is White-listed, the AN searches for
   a best match to the flow in the applicable multicast service profile.
   Matching is done on the prefixes specified in the profile, ignoring
   the address bits of lower order than those in the prefix.

   If the requested multicast flow matches multiple lists associated
   with the access line, then the most specific match will be considered
   by the AN.  If the most specific match occurs in multiple lists, the
   Black list entry takes precedence over the White list.  In this
   context, the most specific match is defined as:

   o  first, most specific match (longest prefix length) on the
      multicast flow address (i.e., on G of <S,G>)

   o  then, most specific match (longest prefix length) on the multicast
      source address (i.e. on S of <S,G>)

   If the requested multicast flow is not part of any list, the join
   message SHOULD be discarded by the AN.  This default behavior can
   easily be changed by means of a "catch-all" statement in the White
   list.  For instance, adding (<S=*,G=*>) in the White List would make
   the default behavior to accept join messages for a multicast flow
   that has no other match on any list.

   When the AN receives a "leave" request, it terminates replication of
   the multicast flow.

6.2.3.  Procedures For Conditional Access With Grey Lists

6.2.3.1.  Provisioning

   The NAS provisions named multicast service profiles containing Grey
   lists on the AN using the Provisioning message containing one or more
   Multicast-Service-Profile TLVs.  The NAS MAY update the contents of
   these profiles from time to time as required, by sending additional
   Provisioning messages with Multicast-Service-Profile TLVs containing
   incremental modifications to the existing Grey lists or replacements
   for them.

   The NAS assigns a specific multicast service profile to an individual
   access line using the Port Management message containing a Multicast-
   Service-Profile-Name TLV.

   The NAS can enable admission control at the AN for Grey-listed flows.



Le Faucheur, et al.      Expires April 29, 2010                [Page 52]

Internet-Draft          ANCP Multicast Extensions           October 2009


   To do this, it MUST include the MRepCtl-CAC TLV in a Provisioning
   message sent to the AN.  It MUST also provide a Bandwidth-Allocation
   TLV in a Port Management message for each access line.

6.2.3.2.  Multicast Service Procedures

   The conditional access with Grey lists capability assumes that IGMP/
   MLD requests are terminated on the AN.  When the AN receives a "join"
   request, it MUST determine whether there is a match to the requested
   flow in the Grey list of the multicast service profile provisioned
   against the given access line.  If there is no match, the request is
   discarded.  Otherwise, the AN MUST send a Multicast Admission Control
   message to the NAS with content identifying the access line and the
   multicast flow to be added.  As indicated in Section 4.4, the AN MAY
   add information identifying the requestor by IP address and/or MAC
   address.

   If the NAS decides to enable the flow, it MUST send a Multicast
   Replication Control request to the AN to replicate the flow to the
   access line with the Result field set to Nack (0x1), as described in
   section ReplicSend.  If admission control has been enabled at the AN
   for flows added by Multicast Replication Control messages, the NAS
   MAY invoke admission control for a specific flow at the AN by
   clearing the R flag in the Command TLV that adds the flow.

   When the AN receives the Multicast Replication Control request, it
   performs admission control if admission control has been enabled and
   invoked by the clearing of the R flag.  If admitting the flow would
   cause the committed multicast bandwidth at the access line to exceed
   the provisioned limit, the AN reports an error to the NAS as
   described in section ReplicRecv.  Otherwise it replicates the
   multicast flow as requested.

   If the NAS decides not to permit the flow, it MAY send a Multicast
   Replication Control message in response to the Multicast Admission
   Control message to allow the AN to update its internal records.  The
   content of this message is described in Section 4.4.2.

   When the AN receives a "leave" request, it MUST terminate replication
   of the flow to the access line.  It MUST then send a Multicast
   Admission Control message to the NAS indicating the deletion.  The
   NAS updates its internal records but MUST NOT respond to the message.

6.2.4.  Procedures For Delegated Bandwidth







Le Faucheur, et al.      Expires April 29, 2010                [Page 53]

Internet-Draft          ANCP Multicast Extensions           October 2009


6.2.4.1.  Provisioning

   The NAS SHOULD provision an initial amount of delegated multicast
   bandwidth for each access line using the Port Management message
   containing the Bandwidth-Allocation TLV.  (If it fails to do so and a
   value has not been provisioned on the AN by other means, the AN will
   be forced to request a bandwidth allocation as soon as it receives a
   "join" request.)

6.2.4.2.  Multicast Service Procedures

   The delegated bandwidth capability assumes that IGMP/MLD requests are
   terminated on the AN.  When the AN receives a "join" request, it
   checks whether it has sufficient remaining uncommitted multicast
   bandwidth on the access line to accommodate the new multicast flow.
   If not, it MAY send a request to the NAS for an increased allocation
   of delegated bandwidth, using the Bandwidth Reallocation Request
   message.  The NAS MUST return a Bandwidth Transfer message indicating
   whether it has granted the request, and if so, what is the new amount
   of delegated bandwidth.

   If the AN has sufficient uncommitted multicast capacity to admit the
   request, either originally or as the result of a successful request
   to the NAS, it replicates the requested flow to the access line.
   Otherwise it discards the request.

   When the AN receives a "leave" request for an active flow, it ceases
   replication.

   The NAS or AN MAY at some point detect that their respective views of
   the amount of delegated bandwidth are inconsistent.  If so, they can
   recover using procedures described in Section 4.5 and Section 4.6.
   As a further aid to synchronization, either the NAS or the AN MAY
   from time to time check the peer's view of the amount of delegated
   bandwidth using the Delegated Bandwidth Query message.

   The NAS or AN MAY at any time release bandwidth to the peer using an
   autonomous Bandwidth Transfer message.  The contents of this message
   are described in Section 4.6.

6.3.  Combinations of Multicast Capabilities

6.3.1.  Combination of NAS-Initiated Replication with Other Capabilities

   NAS-initiated replication can coexist with the other capabilities,
   but some means must exist to prevent double replication of flows.
   The simplest way to do this is to terminate all IGMP/MLD requests on
   the AN, so that NAS-initiated replication is stimulated by signalling



Le Faucheur, et al.      Expires April 29, 2010                [Page 54]

Internet-Draft          ANCP Multicast Extensions           October 2009


   through other channels.  Other arrangements are possible, but need
   not be discussed here.

   Assuming the necessary separation of responsibilities, the only point
   of interaction between NAS-initiated replication and the other
   multicast capabilities is in the area of admission control.
   Specifically, inclusion of the MRepCtl-CAC TLV in a Provisiong
   message enables admission control for flows added by Multicast
   Replication Control messages, regardless of whether they are part of
   NAS-initiated replication or Grey list multicast service processing.
   The NAS can control whether the AN does admission control for
   individual flows by its setting or clearing of the R flag in the
   Command TLV.  It is up to the NAS to choose how video bandwidth will
   be allocated between itself and the AN, and to choose which
   allocation must support specific requests.

6.3.2.  Conditional Access With White, Black, and Grey Lists

   If conditional access with White and Black lists is combined with
   conditional access with Grey lists, provisioning of the multicast
   service profiles is as described in Section 6.2.2.1 except that
   multicast service profiles will also include Grey lists.  Admission
   control is enabled independently for White lists by including the
   White-list-CAC TLV in the Provisioning message and for Grey lists by
   including the MRepCtl-CAC TLV in the Provisioning message.  The
   Bandwidth-Allocation TLV provisions an amount that applies to both
   White- and Grey- listed flows if admission control is enabled for
   both.

   With regard to multicast service procedures, one point of difference
   from the individual capabilities must be noted.  This is an
   interaction during the profile matching procedure.  The AN MUST seek
   the best match amongst multiple lists as described in
   Section 6.2.2.2.  However, if there are multiple matches of equal
   precision, the order of priority is Black list first, Grey list
   second, and White list last.

   Once profile matching has been completed, processing of a "join"
   request is as described in Section 6.2.2.2 for White or Black listed
   flows or Section 6.2.3.2 for Grey listed flows.  Requests that do not
   match any list SHOULD be discarded.

   When the AN receives a "leave" request, it MUST terminate replication
   of the flow to the access line.  If the flow was Grey-listed, the AN
   MUST then send a Multicast Admission Control message to the NAS
   indicating the deletion.  Thus the AN needs to retain the fact that
   the flow was Grey-listed for the life of the flow.




Le Faucheur, et al.      Expires April 29, 2010                [Page 55]

Internet-Draft          ANCP Multicast Extensions           October 2009


6.3.3.  Conditional Access Combined With Delegated Bandwidth

   If either or both conditional access capabilities are combined with
   the delegated bandwidth capability, the AN always does admission
   control.  Delegated bandwith simply provides a means for flexible
   sharing of video bandwidth between the AN and the NAS or Policy
   Server.  The provisioning, admission, and bandwidth management
   procedures of Section 6.2.4 apply in addition to the procedures in
   Section 6.2.2, Section 6.2.3, or Section 6.3.2 as applicable.










































Le Faucheur, et al.      Expires April 29, 2010                [Page 56]

Internet-Draft          ANCP Multicast Extensions           October 2009


7.  Security Considerations

   The security considerations of ANCP are discussed in
   [I-D.ietf-ancp-protocol] and in [I-D.ietf-ancp-security-threats].















































Le Faucheur, et al.      Expires April 29, 2010                [Page 57]

Internet-Draft          ANCP Multicast Extensions           October 2009


8.  IANA Considerations

   This document defines the following additional values within the
   GSMPv3 Message Type Name Space registry:

        +--------------------------------+--------+---------------+
        | Message                        | Number | Source        |
        +--------------------------------+--------+---------------+
        | Multicast Replication Control  | 90     | This document |
        |                                |        |               |
        | Multicast Status               | 91     | This document |
        |                                |        |               |
        | Multicast Admission Control    | 92     | This document |
        |                                |        |               |
        | Bandwidth Reallocation Request | 94     | This document |
        |                                |        |               |
        | Bandwidth Transfer             | 95     | This document |
        |                                |        |               |
        | Delegated Bandwidth Query      | 96     | This document |
        |                                |        |               |
        | Multicast Flow Query           | 97     | This document |
        +--------------------------------+--------+---------------+

   This document defines the following values for the ANCP Status-Info
   Result Code Registry :


























Le Faucheur, et al.      Expires April 29, 2010                [Page 58]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +----------------------------------------------+--------+-----------+
   | Status                                       | Number | Reference |
   +----------------------------------------------+--------+-----------+
   | Command not supported                        | 0x02   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | Flag set but not supported                   | 0x03   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | Unsupported Address Family                   | 0x05   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | Malformed flow address                       | 0x06   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | Configuration error (such as Port not        | 0x0a   | This      |
   | enabled for multicast)                       |        | document  |
   |                                              |        |           |
   | Multicast flow does not exist                | 0x0b   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | Unsupported address encoding                 | 0x0c   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | Additional info needed to execute command    | 0x0d   | This      |
   | (payload MAY contain an indication of the    |        | document  |
   | expected info)                               |        |           |
   |                                              |        |           |
   | Multicast flow count exceeded                | 0x0e   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | M Flag set, but no IP Source address         | 0x0f   | This      |
   | provided                                     |        | document  |
   |                                              |        |           |
   | Invalid preferred bandwidth amount           | 0x11   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | bandwidth delegation not activated           | 0x12   | This      |
   |                                              |        | document  |
   |                                              |        |           |
   | Delegated bandwidth reset required           | 0x13   | This      |
   |                                              |        | document  |
   +----------------------------------------------+--------+-----------+

   This document defines the following additional values within the ANCP
   TLV Type Registry:





Le Faucheur, et al.      Expires April 29, 2010                [Page 59]

Internet-Draft          ANCP Multicast Extensions           October 2009


      +--------------------------------+-----------+---------------+
      | TLV Name                       | Type Code | Reference     |
      +--------------------------------+-----------+---------------+
      | Multicast-Service-Profile      | 0x13      | This document |
      |                                |           |               |
      | Bandwidth-Delegation-Control   | 0x14      | This document |
      |                                |           |               |
      | Bandwidth-Allocation           | 0x15      | This document |
      |                                |           |               |
      | Bandwidth-Request              | 0x16      | This document |
      |                                |           |               |
      | Bandwidth-Status               | 0x17      | This document |
      |                                |           |               |
      | Multicast-Service-Profile-Name | 0x18      | This document |
      |                                |           |               |
      | Multicast-Flow                 | 0x19      | This document |
      +--------------------------------+-----------+---------------+

   This document defines the following values for the ANCP Command Code
   registry:

   +-------------------------------------+----------------+------------+
   | Command Code Directive Name         | Command Code   | Reference  |
   |                                     | Value          |            |
   +-------------------------------------+----------------+------------+
   | Add                                 | 0x01           | This       |
   |                                     |                | document   |
   |                                     |                |            |
   | Delete                              | 0x02           | This       |
   |                                     |                | document   |
   |                                     |                |            |
   | Delete All                          | 0x03           | This       |
   |                                     |                | document   |
   |                                     |                |            |
   | Admission Control Reject            | 0x04           | This       |
   |                                     |                | document   |
   |                                     |                |            |
   | Conditional Access Reject           | 0x05           | This       |
   |                                     |                | document   |
   |                                     |                |            |
   | Admission Control and Conditional   | 0x06           | This       |
   | Access Reject                       |                | document   |
   +-------------------------------------+----------------+------------+

   This document defines the following additional values to the ANCP
   sub-TLV Type registry:





Le Faucheur, et al.      Expires April 29, 2010                [Page 60]

Internet-Draft          ANCP Multicast Extensions           October 2009


            +--------------------+-----------+---------------+
            | sub-TLV Name       | Type Code | Reference     |
            +--------------------+-----------+---------------+
            | Request-Source-IP  | 0x92      | This document |
            |                    |           |               |
            | Request-Source-MAC | 0x93      | This document |
            +--------------------+-----------+---------------+












































Le Faucheur, et al.      Expires April 29, 2010                [Page 61]

Internet-Draft          ANCP Multicast Extensions           October 2009


9.  Acknowledgements

   The authors would like to acknowledge Wojciech Dec for providing
   useful input to this document, Robert Rennison for his help in
   shaping the definition of the Multicast-Service-Profile TLV, Shridhar
   Rao for his comments and suggestions and Aniruddha A for his proposal
   that formed the base of the Multicast Flow Reporting solution.
   Philippe Champagne, Sanjay Wadhwa and Stefaan De Cnodder provided
   substantial contributions on the solution for the NAS initiated
   multicast control use case.









































Le Faucheur, et al.      Expires April 29, 2010                [Page 62]

Internet-Draft          ANCP Multicast Extensions           October 2009


10.  References

10.1.  Normative References

   [I-D.ietf-ancp-framework]
              Ooghe, S., Voigt, N., Platnic, M., Haag, T., and S.
              Wadhwa, "Framework and Requirements for an Access Node
              Control Mechanism in Broadband  Multi-Service Networks",
              draft-ietf-ancp-framework-12 (work in progress),
              October 2009.

   [I-D.ietf-ancp-protocol]
              Wadhwa, S., Moisand, J., Subramanian, S., Haag, T., Voigt,
              N., and R. Maglione, "Protocol for Access Node Control
              Mechanism in Broadband Networks",
              draft-ietf-ancp-protocol-07 (work in progress),
              October 2009.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2710]  Deering, S., Fenner, W., and B. Haberman, "Multicast
              Listener Discovery (MLD) for IPv6", RFC 2710,
              October 1999.

   [RFC3376]  Cain, B., Deering, S., Kouvelas, I., Fenner, B., and A.
              Thyagarajan, "Internet Group Management Protocol, Version
              3", RFC 3376, October 2002.

   [RFC3810]  Vida, R. and L. Costa, "Multicast Listener Discovery
              Version 2 (MLDv2) for IPv6", RFC 3810, June 2004.

10.2.  Informative References

   [I-D.ietf-ancp-security-threats]
              Moustafa, H., Tschofenig, H., and S. Cnodder, "Security
              Threats and Security Requirements for the Access Node
              Control  Protocol (ANCP)",
              draft-ietf-ancp-security-threats-08 (work in progress),
              July 2009.

   [I-D.morin-mboned-igmpmld-error-feedback]
              Morin, T. and B. Haberman, "IGMP/MLD Error Feedback",
              draft-morin-mboned-igmpmld-error-feedback-02 (work in
              progress), November 2008.

   [IANAAEA]  "http://www.iana.org/assignments/address-family-numbers",
              2005.



Le Faucheur, et al.      Expires April 29, 2010                [Page 63]

Internet-Draft          ANCP Multicast Extensions           October 2009


   [RFC4601]  Fenner, B., Handley, M., Holbrook, H., and I. Kouvelas,
              "Protocol Independent Multicast - Sparse Mode (PIM-SM):
              Protocol Specification (Revised)", RFC 4601, August 2006.
















































Le Faucheur, et al.      Expires April 29, 2010                [Page 64]

Internet-Draft          ANCP Multicast Extensions           October 2009


Appendix A.  Example of Messages and Message Flows

   This section provides example message flows.

A.1.  Multicast Conditional Access and CAC without AN bandwidth
      delegation

   This section describes ANCP operations when multicast flows are
   subject to multicast Conditional Access and Admission Control without
   bandwidth delegation.

A.1.1.  List/Profile Provisioning

   The AN provisioning is performed by NAS using a Provisioning message
   that contains White/Black/Grey lists and their corresponding
   "Multicast Service Profile Name".  To indicate to the AN that it need
   not perform any CAC operation on those flows, the Provisioning
   message also conveys an indication that bandwidth delegation is to be
   deactivated.  The corresponding message flow is illustrated in
   Figure 13.

 +----------+      +---------+               +-----+             +-----+
 |Subscriber|      |  Home   |               | AN  |             | NAS |
 +----------+      | Gateway |               +-----+             +-----+
      |            +---------+                 |                     |
      |                 |                      |                     |
      |                 |                      |(M1) Provisioning    |
      |                 |                      | (Mcast S Prof name, |
      |                 |                      |     White List,     |
      |                 |                      |      Grey List,     |
      |                 |                      |      Black List,    |
      |                 |                      | Bw Del Deactivated) |
      |                 |                      |<--------------------|


        Figure 13: Provisioning AN with White/Grey/Black Lists for
                            Conditional Access

   The Provisioning message M1 contains:

   o  an ANCP Header with:

      *  Message-Type = 93 - Provisioning

      *  Result= 0x00

      *  Transaction-ID = Transaction-ID maintained by NAS




Le Faucheur, et al.      Expires April 29, 2010                [Page 65]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  a Multicast-Service-Profile TLV containing:

      *  a Multicast-Service-Profile-Name sub-TLV

      *  an Empty White-List in our example (and hence no White-List
         sub-TLV)

      *  a Grey-List sub-TLV containing a catch-all entry for IPv4 (in
         our example)

      *  an Empty Black-List in our example (and hence no Black-List
         sub-TLV)

   The Provisioning message M1 is illustrated below:

       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=93 | 0x00  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0008      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Mcast-Service-Prof TLV Type   | Mcast-Service-Prof TLV Length |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | sub-TLV Type = 0x0001         |       sub-TLV Length          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Multicast service profile name             ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | sub-TLV Type = 0x0003         |   sub-TLV Length = 0x06       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | IP ver = 0x00                 |       List length = 0x02      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Grp PLen=0x00 | Src PLen=0x00 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                                 Figure 14








Le Faucheur, et al.      Expires April 29, 2010                [Page 66]

Internet-Draft          ANCP Multicast Extensions           October 2009


A.1.2.  Profile Mapping

   As soon as the AN port comes up, the AN sends an ANCP PORT_UP message
   to the NAS specifying the Access Loop Circuit ID.  The NAS replies
   with an ANCP PORT_MNGT message that, together with the other
   parameters, includes the Multicast Service Profile Name to be
   associated to that Port.  The corresponding message flow is
   illustrated in Figure 15.

 +----------+      +---------+               +-----+             +-----+
 |Subscriber|      |  Home   |               | AN  |             | NAS |
 +----------+      | Gateway |               +-----+             +-----+
      |            +---------+                 |                     |
      |                 |                      |                     |
      |                 |                      |                     |
      |                 |      DSL Synch.      |                     |
      |                 |--------------------->|                     |
      |                 |                      |(M1)PORT_UP(Port ID) |
      |                 |                      |-------------------->|
      |                 |                      |                    (*)
      |                 |                      |(M2) PORT_MNGT       |
      |                 |                      |    (Port ID,        |
      |                 |                      |Mcast S Profile Name)|
      |                 |                      |<--------------------|


(*) The NAS may optionally seek direction from an external
    Autorization/Policy Server

               Figure 15: Associating Profile ID to AN Port

A.1.3.  Successful Join/Leave Operations

   The message flows in Figure 16 illustrates the ANCP message flow in
   case of a simple join and leave for a multicast flow that matches the
   grey list and when the "bandwidth delegation" mechanism is not
   activated in the AN.  In that case the AN queries the NAS that
   performs Conditional Access and Admission Control.













Le Faucheur, et al.      Expires April 29, 2010                [Page 67]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +----------+    +-------+   +-----+    ANCP    +-----+
   |Subscriber|    | Home  |   | AN  |<---------->| NAS |
   +----------+    |Gateway|   +-----+            +-----+
         |         +-------+     |                   |
         |           |           |                   |
         |      Join(Grey-Fl)    |     Admission     |
         |-----------+---------->|      Control (M1) |
         |           |           |------------------>|
         |           |           |                   |
         |           |           |     Multicast     |
         |           |           |     Replication  (*)
         |           |           |     Control (M2)  |
         |     Mcast Grey Flow   |<------------------|
         |<======================+                   |
         |           |           |                   |
         ~           ~           ~                   ~
         |           |           |                   |
         |     Leave(Grey-Fl)    |     Admission     |
         |-----------+---------->|      Control (M3) |
         |           |           |------------------>|
         |           |           |                   |



   Grey-Fl   : Multicast Flow matching an entry in Grey List
               (bandwidth delegation not activated on AN)

   (*) The NAS may optionally seek direction from an external
       Autorization/Policy Server

                Figure 16: Successful Join/Leave Operations

   The Multicast Admission Control message M1 contains:

   o  an ANCP Header with:

      *  Message-Type = 92 - Multicast Admission Control

      *  Result= 0x00

      *  Transaction-ID = Transaction-ID maintained by AN

   o  a Target TLV identifying the AN Port

   o  a Command TLV containing:

      *  a Command Code = Add




Le Faucheur, et al.      Expires April 29, 2010                [Page 68]

Internet-Draft          ANCP Multicast Extensions           October 2009


      *  R = 0

      *  O = 0

      *  the multicast flow for which the IGMP Join was received by AN=
         (192.0.2.1, 233.252.2.2)

      *  a Request-Source-IP sub-TLV containing the IGMP join source IP
         (192.0.2.100).

   The Multicast Admission Control message M1 is illustrated below:

       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=92 | 0x00  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0001      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type = 0x1000 (Target)      |        Target TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type = 0xTBD (Command) TLV   |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0x01 |0 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.2     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
       |Type = (Request-S-IP) sub-TLV  | Request-S-IP sub-TLV Length   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Source : 192.0.2.100         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+



   The Multicast Replication Control message M2 contains:





Le Faucheur, et al.      Expires April 29, 2010                [Page 69]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  an ANCP Header with:

      *  Message-Type = 90 - Multicast Replication Control

      *  Result= 0x00

      *  Transaction-ID = Transaction-ID maintained by NAS

   o  a Target TLV identifying the AN Port

   o  a Command TLV containing:

      *  a Command Code = Add

      *  R= 1 (since in our example the flow resources have been
         admitted by NAS)

      *  O = 0 (since in our example flow accounting is not required)

      *  the multicast flow for which the IGMP Join was received by AN=
         (192.0.2.1, 233.252.2.2)

      *  a Request-Source-IP sub-TLV containing the IGMP join source IP
         (192.0.2.100).

   The Multicast Admission Control message M2 is illustrated below:

























Le Faucheur, et al.      Expires April 29, 2010                [Page 70]

Internet-Draft          ANCP Multicast Extensions           October 2009


       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=90 | 0x00  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0009      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type = 0x1000 (Target)      |        Target TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type = 0xTBD (Command) TLV   |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0x01 |1 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.2     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
       |Type = (Request-S-IP) sub-TLV  | Request-S-IP sub-TLV Length   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Source : 192.0.2.100         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+



   The Multicast Admission Control message M3 contains:

   o  an ANCP Header with:

      *  Message-Type = 92 - Multicast Admission Control

      *  Result= 0x00

      *  Transaction-ID = Transaction-ID maintained by AN

   o  a Target TLV identifying the AN Port

   o  a Command TLV containing:





Le Faucheur, et al.      Expires April 29, 2010                [Page 71]

Internet-Draft          ANCP Multicast Extensions           October 2009


      *  a Command Code = Delete

      *  R = 0

      *  O = 0

      *  the multicast flow for which the IGMP leave was received by AN=
         (192.0.2.1, 233.252.2.2)

      *  a Request-Source-IP sub-TLV containing the IGMP join source IP
         (192.0.2.100).

   The Multicast Admission Control message M3 is illustrated below:






































Le Faucheur, et al.      Expires April 29, 2010                [Page 72]

Internet-Draft          ANCP Multicast Extensions           October 2009


       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=92 | 0x00  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0002      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type = 0x1000 (Target)      |        Target TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID 0x0002 |        Circuit-ID Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type = 0xTBD (Command) TLV   |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0x02 |0 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.2     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
       |Type = 0xTBD (Request-S.) TLV  |    Request-S.-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |Type = (Request-S-IP) sub-TLV  | Request-S-IP sub-TLV Length   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Source : 192.0.2.100         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+



A.1.4.  Admission Control Reject without NAS Response

   The message flow in Figure 17 illustrates the ANCP message flow in
   case of a join that is rejected by the NAS because of admission
   control and without explicit response from the NAS.  In that case,
   the multicast flow is never replicated simply by virtue of the NAS
   not requesting replication.









Le Faucheur, et al.      Expires April 29, 2010                [Page 73]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +----------+    +-------+   +-----+    ANCP    +-----+
   |Subscriber|    | Home  |   | AN  |<---------->| NAS |
   +----------+    |Gateway|   +-----+            +-----+
         |         +-------+     |                   |
         |           |           |                   |
         |      Join(Grey-Fl)    |     Admission     |
         |-----------+---------->|      Control (M1) |
         |           |           |------------------>|
         |           |           |                   |
         |           |           |                  (*)
         |           |           |                   |
         |     Mcast Grey Flow   |                   |
         |       not replicated  x                   |
         |           |           |                   |


   Grey-Fl   : Multicast Flow matching an entry in Grey List
               (bandwidth delegation not activated on AN)

   (*) The NAS may optionally seek direction from an external
       Autorization/Policy Server

         Figure 17: Admission Control Reject without NAS Response

   The Multicast Admission Control message M1 contains:

   o  an ANCP Header with:

      *  Message-Type = 92 - Multicast Admission Control

      *  Result= 0x00

      *  Transaction-ID = Transaction-ID maintained by AN

   o  a Target TLV identifying the AN Port

   o  a Command TLV containing:

      *  a Command Code = Add

      *  R = 0

      *  O = 0

      *  the multicast flow for which the IGMP join was received by AN=
         (192.0.2.1, 233.252.2.3).





Le Faucheur, et al.      Expires April 29, 2010                [Page 74]

Internet-Draft          ANCP Multicast Extensions           October 2009


      *  a Request-Source-IP sub-TLV containing the IGMP join source IP
         (192.0.2.100).

   The Multicast Admission Control message M1 is illustrated below:

       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=92 | 0x00  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0003      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type = 0x1000 (Target)      |        Target TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type = 0xTBD (Command) TLV   |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0x01 |0 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.3     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
       |Type = (Request-S-IP) sub-TLV  | Request-S-IP sub-TLV Length   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Source : 192.0.2.100         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+



A.1.5.  Admission Control Reject with NAS Response

   The message flow in Figure 18 illustrates the ANCP message flow in
   case of a join that is rejected by the NAS because of admission
   control and with explicit response from the NAS.  In that case, the
   multicast flow is not replicated by virtue of the NAS explicitely
   signaling to the AN that the multicast flow is not to be replicated.






Le Faucheur, et al.      Expires April 29, 2010                [Page 75]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +----------+    +-------+   +-----+    ANCP    +-----+
   |Subscriber|    | Home  |   | AN  |<---------->| NAS |
   +----------+    |Gateway|   +-----+            +-----+
         |         +-------+     |                   |
         |           |           |                   |
         |      Join(Grey-Fl)    |     Admission     |
         |-----------+---------->|      Control (M1) |
         |           |           |------------------>|
         |           |           |                   |
         |           |           |     Multicast    (*)
         |           |           |     Replication   |
         |           |           |     Control (M2)  |
         |     Mcast Grey Flow   |<------------------|
         |       not replicated  x                   |
         |           |           |                   |


   Grey-Fl   : Multicast Flow matching an entry in Grey List
               (bandwidth delegation not activated on AN)

   (*) The NAS may optionally seek direction from an external
       Autorization/Policy Server

           Figure 18: Admission Control Reject with NAS Response

   The Multicast Admission Control message M1 contains:

   o  an ANCP Header with:

      *  Message-Type = 92 - Multicast Admission Control

      *  Result= 0x00

      *  Transaction-ID = Transaction-ID maintained by AN

   o  a Target TLV identifying the AN Port

   o  a Command TLV containing:

      *  a Command Code = Add

      *  R = 0

      *  O = 0

      *  the multicast flow for which the IGMP join was received by AN=
         (192.0.2.1, 233.252.2.4).




Le Faucheur, et al.      Expires April 29, 2010                [Page 76]

Internet-Draft          ANCP Multicast Extensions           October 2009


      *  a Request-Source-IP sub-TLV containing the IGMP join source IP
         (192.0.2.100).

   The Multicast Admission Control message M1 is illustrated below:

       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=92 | 0x00  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0004      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type = 0x1000 (Target)      |        Target TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type = 0xTBD (Command) TLV   |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0x01 |0 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.4     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
       |Type = (Request-S-IP) sub-TLV  | Request-S-IP sub-TLV Length   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Source : 192.0.2.100         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+



   The Multicast Replication Control message M2 contains:

   o  an ANCP Header with:

      *  Message-Type = 90 - Multicast Replication Control

      *  Result= 0x00

      *  Transaction-ID = Transaction-ID maintained by NAS




Le Faucheur, et al.      Expires April 29, 2010                [Page 77]

Internet-Draft          ANCP Multicast Extensions           October 2009


   o  a Target TLV identifying the AN Port

   o  a Command TLV containing:

      *  a Command Code = Admission Control Reject (since in our example
         the flow is rejected by NAS because of bandwidth admission
         control and not because of conditional access)

      *  R= 0 (since in our example the flow resources have not been
         admitted by NAS)

      *  O = 0 (since in our example flow accounting is not required)

      *  the multicast flow (192.0.2.1, 233.252.2.4)

      *  a Request-Source-IP sub-TLV containing the IGMP join source IP
         (192.0.2.100).

   The Multicast Admission Control message M2 is illustrated below:
































Le Faucheur, et al.      Expires April 29, 2010                [Page 78]

Internet-Draft          ANCP Multicast Extensions           October 2009


       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Type (0x88-0C)         |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Vers  |  Sub  |MessageType=90 | 0x00  |        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0010      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type = 0x1000 (Target)      |        Target TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type = 0xTBD (Command) TLV   |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Cmd Code=0xTBD|0 0 1          |      Command Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.4     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
       |Type = (Request-S-IP) sub-TLV  | Request-S-IP sub-TLV Length   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Source : 192.0.2.100         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+



A.2.  Example Flows For bandwidth delegation

   As noted in TBD, the operation of bandwidth delegation is
   supplemental to the operation of request processing in the absence of
   bandwidth delegation.  Thus the same flows shown in the previous
   section continue to hold, except that the AN does multicast call
   admission before doing grey and white list processing.  The example
   flows of this section are therefore limited to the incremental
   operations of bandwidth delegation.  They include initial
   provisioning, a successful request from the AN for an increase in
   total multicast bandwidth, an autonomous transfer of the borrowed
   bandwidth back to the NAS, and the initiation of the bandwidth reset
   procedure [text to be modified] by the NAS when it finds that the
   amount of total multicast bandwidth passed by the AN is larger than
   its current view of that amount.



Le Faucheur, et al.      Expires April 29, 2010                [Page 79]

Internet-Draft          ANCP Multicast Extensions           October 2009


A.2.1.  Activation and Provisioning of total multicast Bandwidth

   Activation of bandwidth delegation occurs at the level of the AN as a
   whole and is done by including a Bandwidth-Delegation-Control TLV in
   the Provisioning message with the E-flag set to 1.  The message flow
   is as shown in Figure 13.  In place of Figure 14 we have the
   following content within the Provisioning message:

                       1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type (0x88-0C)         |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  |MessageType=93 | 0x00  |        Code           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier = 0008      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Mcast-Service-Prof TLV Type   | Mcast-Service-Prof TLV Length |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | sub-TLV Type = 0x0001         |       sub-TLV Length          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Multicast service profile name             ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | sub-TLV Type = 0x0003         |   sub-TLV Length = 0x06       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | IP ver = 0x00                 |       List length = 0x02      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Grp PLen=0x00 | Src PLen=0x00 |           Padding = 0x00      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | TLV Type = Band-Del-Control   |       TLV Length = 0x04       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |E|      Reserved  = 0x00       |        Reserved  = 0x00       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 19

   Once bandwidth delegation has been activated, the NAS must provision
   the amount of total multicast bandwidth for each access line (unless
   it is pre-configured on the AN).  This requires a Port Management
   message with a Bandwidth-Allocation TLV.  The same Port Management
   message may be used to provision other information, such as the
   multicast service profile name applicable to the access line.  The
   information flow is therefore similar to that in Figure 15.  In the
   following figure, an initial allocation of 8000 kbits/s is provided.



Le Faucheur, et al.      Expires April 29, 2010                [Page 80]

Internet-Draft          ANCP Multicast Extensions           October 2009


    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  | Msg Type = 32 |Rslt =1|        Code = 0       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             Port = 0                          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Port Session Number                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     Event Sequence Number                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |R|x|x|x|x|x|x|x|   Duration    |    Func = 8   | X-Func = 0    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Event Flags         |        Flow Control Flags     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |x|x|x|x|x|x|x|x| Msg Type = 32 | Tech Type = 5 | Block Len = 0 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     # of TLVs = 2             | Ext Block length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |      TLV Type = 0x01          |  Access-Loop-Cct-ID length    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                 Access-Loop-Circuit-ID                        ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  TLV Type = Bandwidth-Alloc   |         TLV length = 4        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                 Delegated amount = 8000                       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       Figure 20: Port Management Message Allocating total multicast
                                 Bandwidth

A.2.2.  Successful Request For More Multicast Bandwidth

   Suppose that the AN allocates all 8000 kbits/s of its total multicast
   amount and receives a Join request requiring another 2000 kbits/s.
   The AN issues a Bandwidth Reallocation Request message where the
   required amount field is set to acquire this amount of additional
   bandwidth.  Since the request is framed in terms of total total
   multicast bandwidth, required amount is 10000 kbits/s.  Suppose that
   the AN is configured with a policy that causes it to request enough
   for one additional channel as a preferred amount.  Hence the
   preferred amount is set to 12000 kbits/s.  The Bandwidth Reallocation



Le Faucheur, et al.      Expires April 29, 2010                [Page 81]

Internet-Draft          ANCP Multicast Extensions           October 2009


   Request message has the following format:

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  | MsgTyp = 94   |Rslt=0 |        Code = 0       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    TLV Type = Target          |        Target-TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID=0x0001 |       Circuit-ID Length       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID                     ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |TLV Type = Bandwidth-Request   |          TLV Length = 8       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Required amount =  10000                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Preferred amount = 12000                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

         Figure 21: Example Bandwidth Reallocation Request Message

   In response to this request, the NAS is willing to grant the full
   preferred amount.  (It could have granted any value between 10000 and
   12000, or it could have rejected the request.)  The Bandwidth
   Transfer message sent as a response indicates that the new total
   multicast bandwidth amount is 12000 kbits/s, as shown in the next
   figure.

















Le Faucheur, et al.      Expires April 29, 2010                [Page 82]

Internet-Draft          ANCP Multicast Extensions           October 2009


    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  | MsgTyp = 95   |Rslt=3 |        Code = 0       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    TLV Type = Target          |        Target-TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID=0x0001 |       Circuit-ID Length       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID                     ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |TLV Type = Bandwidth-Alloc     |          TLV Length = 4       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Delegated amount = 12000                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     Figure 22: Example Bandwidth Transfer Message (Success Response)

A.2.3.  Failed Autonomous Transfer With Reset

   Suppose the AN decides after an interval that it should return 2000
   kbits/s of the 4000 kbits/s that it acquired from the NAS in the
   previous transaction.  It therefore issues a Bandwidth Transfer
   message of its own.  This message differs from the message in
   Figure 22 in two ways.  First, because this is an autonomous transfer
   rather than a response, the Result field in the header is set to
   Ignore (0x0).  Secondly, the Delegated amount is reduced to 10000
   kbits/s.

   Now suppose that somehow the NAS forgot that it passed an additional
   4000 kbits/s to the AN.  Thus its current view of the amount of total
   multicast bandwidth is 8000 kbits/s.  The 10000 kbits/s appearing in
   the Bandwidth Transfer message is higher than this, so there is
   clearly a disgareement between the NAS and the AN.  The NAS chooses
   to initiate the reset procedure, perhaps because it is close to
   committing all of its available video bandwidth for unicast service.
   As the initial step in this procedure, it issues a Multicast Status
   message indicating that a reset of the total multicast amount is
   required.  This is shown in the following figure.






Le Faucheur, et al.      Expires April 29, 2010                [Page 83]

Internet-Draft          ANCP Multicast Extensions           October 2009


   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type (0x88-0C)         |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  |MessageType=91 | 0x4   |        Code = 0       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Status-info-TLV=TBD    |      Status-TLV-Length        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Rslt Code = xx | Cmd No = 1    |    Error Message Length       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Error Message (padded to 4) if Length > 0           |
   +---------------------------------------------------------------+
   |    TLV Type = Target          |        Target-TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID=0x0001 |       Circuit-ID Length       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID                     ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |TLV Type = Bandwidth-Alloc     |          TLV Length = 4       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Delegated amount = 8000                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The Result Code field within the Status-Info TLV contains the value:
   total multicast bandwidth reset required (0xTBD).

        Figure 23: Example Initiation of Multicast Bandwidth Reset

   The NAS stops processing video service requests for the given access
   line when it sends this message.  Similarly, the AN stops processing
   multicast video service requests when it receives the message.  [To
   think about: can service requests that release bandwidth be safely
   processed?  Probably.]  The next step is up to the NAS: it sends a
   bandwidth delegation Query Request message to the AN.  The Result
   field in the header is set to Ignore (0x0) as usual for multicast-
   related messages.  The Target TLV is a copy of the one received in
   the original Bandwidth Transfer message.  The message is shown in the
   following figure:







Le Faucheur, et al.      Expires April 29, 2010                [Page 84]

Internet-Draft          ANCP Multicast Extensions           October 2009


    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  | MsgTyp = 96   |Rslt=0 |        Code = 0       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    TLV Type = Target          |        Target-TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID=0x0001 |       Circuit-ID Length       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID                     ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       Figure 24: Example Delegated Bandwidth Query Request Message

   The AN returns a Delegated Bandwidth Query Response message showing
   that it believes that the amount of total multicast bandwidth is
   10000 kbits/s and it has committed 8000 kbits/s of it.  The Result
   field in the header shows Success (0x3) to distinguish the response.
   [... in case we decide to make the query bidirectional ...]


























Le Faucheur, et al.      Expires April 29, 2010                [Page 85]

Internet-Draft          ANCP Multicast Extensions           October 2009


    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  | MsgTyp = 96   |Rslt=3 |        Code = 0       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    TLV Type = Target          |        Target-TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID=0x0001 |       Circuit-ID Length       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID                     ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |TLV Type = Bandwidth-Request   |          TLV Length = 8       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Delegated amount =  10000                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Committed amount =  8000                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       Figure 25: Example Delegated Bandwidth Query Response Message

   The NAS decides to reset the total multicast bandwidth amount to 8000
   kbits/s.  It issues a Port Management message looking exactly like
   the one in Figure 20.  Once it sends this message, it resumes
   processing service requests for the access line concerned.
   Similarly, the AN resumes request processing after it receives the
   Port Management message and resets its view of the current total
   multicast bandwidth.  In the short run, this means that it will have
   to ask for more bandwidth if it receives another Join request.  [It
   seems reasonable that the AN would not do so for a period of time
   after a reset or a response to a Bandwidth Reallocation Request that
   grants less than the preferred amount.  Should we establish a timer?]

A.3.  Example Flows For Multicast Flow Reporting

A.3.1.  Per Port Multicast Flow Reporting

   Figure 26 illustrate a message flow in the case where the NAS queries
   the AN about which multicast flow is active on port 10, on port 20
   and on port 11 of the AN.






Le Faucheur, et al.      Expires April 29, 2010                [Page 86]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +----------+    +-------+   +-----+    ANCP    +-----+
   |Subscriber|    | Home  |   | AN  |<---------->| NAS |
   +----------+    |Gateway|   +-----+            +-----+
         |         +-------+     |                   |
         |           |           |  Multicast Flow   |
         |           |           |  Query Request    |
         |           |           |      (M1)         |
         |           |           |<------------------|
         |           |           |                   |
         |           |           | Multicast Flow    |
         |           |           | Query Response    |
         |           |           |      (M2)         |
         |           |           |------------------>|
         |           |           |                   |
         |           |           |                   |



               Figure 26: Per Port Multicast Flow Reporting

   The Multicast Flow Query Request message (M1) is illustrated in
   Figure 27.





























Le Faucheur, et al.      Expires April 29, 2010                [Page 87]

Internet-Draft          ANCP Multicast Extensions           October 2009


    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  | Msg Type = 97 |Rslt=00|        Code = 0       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type = 0x1000 (Target)      |        Target TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID (port10)            ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type = 0x1000 (Target)      |        Target TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID (port20)            ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type = 0x1000 (Target)      |        Target TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID (port11)            ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Figure 27: Multicast Flow Query Request message for per-port Mulicast
                              Flow Reporting

   The Multicast Flow Query Response message (M2) is illustrated in
   Figure 28.  It indicates that there is one active multicast flow
   [(192.0.2.1, 233.252.2.4)] on port 10, no active multicast flow on
   port 20 and two active multicast flows [(192.0.2.1, 233.252.2.4) and
   (192.0.2.2, 233.252.2.10)] on port 11.


    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers  |  Sub  | Msg Type = 97 |Rslt=00|        Code = 0       |



Le Faucheur, et al.      Expires April 29, 2010                [Page 88]

Internet-Draft          ANCP Multicast Extensions           October 2009


   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type = 0x1000 (Target)      |        Target TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID (port10)             ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Type=0x19 (Multicast-Flow) TLV | Multicast Flow-TLV Length     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.4     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
   |   Type = 0x1000 (Target)      |        Target TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID (port20)             ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type = 0x1000 (Target)      |        Target TLV Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Access-Loop-Circuit-ID 0x0001 |        Circuit-ID Length      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                    Access Loop Circuit ID (port11)            ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Type=0x19 (Multicast-Flow) TLV | Multicast Flow-TLV Length     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.1      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.4     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+
   |Type=0x19 (Multicast-Flow) TLV | Multicast Flow-TLV Length     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | AddrFamily 01 | EncType 0x0   |  Mcast Source: 192.0.2.2      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | AddrFamily 01 | EncType 0x0   |  Mcast Flow : 233.252.2.10    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+--+




Le Faucheur, et al.      Expires April 29, 2010                [Page 89]

Internet-Draft          ANCP Multicast Extensions           October 2009


       Figure 28: Multicast Flow Query Response message for per-port
                          Mulicast Flow Reporting

















































Le Faucheur, et al.      Expires April 29, 2010                [Page 90]

Internet-Draft          ANCP Multicast Extensions           October 2009


Authors' Addresses

   Francois Le Faucheur
   Cisco Systems
   Greenside, 400 Avenue de Roumanille
   Sophia Antipolis  06410
   France

   Phone: +33 4 97 23 26 19
   Email: flefauch@cisco.com


   Roberta Maglione
   Telecom Italia
   Via Reiss Romoli 274
   Torino  10148
   Italy

   Phone:
   Email: roberta.maglione@telecomitalia.it


   Tom Taylor
   Huawei Technologies
   1852 Lorraine Ave
   Ottawa, Ontario  K1H 6Z8
   Canada

   Phone: +1 613 680 2675
   Email: tom111.taylor@bell.net





















Le Faucheur, et al.      Expires April 29, 2010                [Page 91]


Html markup produced by rfcmarkup 1.107, available from http://tools.ietf.org/tools/rfcmarkup/