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Network Working Group                                         S.  Wadhwa
Internet-Draft                                                J. Moisand
Intended status: Standards Track                          S. Subramanian
Expires: September 10, 2009                             Juniper Networks
                                                                T.  Haag
                                                               T-systems
                                                                N. Voigt
                                                                 Siemens
                                                             R. Maglione
                                                          Telecom Italia
                                                           March 9, 2009


    Protocol for Access Node Control Mechanism in Broadband Networks
                      draft-ietf-ancp-protocol-05

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
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   This Internet-Draft will expire on September 10, 2009.

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   Copyright (c) 2009 IETF Trust and the persons identified as the
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   Please review these documents carefully, as they describe your rights



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   and restrictions with respect to this document.

Abstract

   This document describes proposed extensions to the GSMPv3 protocol to
   allow its use in a broadband environment, as a control plane between
   Access Nodes (e.g.  DSLAM) and Broadband Network Gateways (e.g.
   NAS).  These proposed extensions are required to realize a protocol
   for "Access Node Control" mechanism as described in [ANCP-FRAMEWORK].
   The resulting protocol with the proposed extensions to GSMPv3
   [RFC3292] is referred to as "Access Node Control Protocol" (ANCP).
   This document currently focuses on specific use cases of access node
   control mechanism for topology discovery, line configuration, and OAM
   as described in ANCP framework document [ANCP-FRAMEWORK].  It is
   intended to be augmented by additional protocol specification for
   future use cases considered in scope by the ANCP charter.

   ANCP framework document [ANCP-FRAMEWORK] describes the ANCP use-cases
   in detail.  Illustrative text for the use-cases is included here to
   help the protocol implementer understand the greater context of ANCP
   protocol interactions.






























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Table of Contents

   1.  Specification Requirements . . . . . . . . . . . . . . . . . .  4
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Broadband Access Aggregation . . . . . . . . . . . . . . . . .  5
     3.1.  ATM-based broadband aggregation  . . . . . . . . . . . . .  5
     3.2.  Ethernet-based broadband aggregation . . . . . . . . . . .  7
   4.  Access Node Control Protocol . . . . . . . . . . . . . . . . .  7
     4.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . .  8
     4.2.  ANCP based Access Topology Discovery . . . . . . . . . . .  8
       4.2.1.  Goals  . . . . . . . . . . . . . . . . . . . . . . . .  8
       4.2.2.  Message Flow . . . . . . . . . . . . . . . . . . . . .  9
     4.3.  ANCP based Line Configuration  . . . . . . . . . . . . . . 10
       4.3.1.  Goals  . . . . . . . . . . . . . . . . . . . . . . . . 10
       4.3.2.  Message Flow . . . . . . . . . . . . . . . . . . . . . 11
     4.4.  ANCP based Transactional Multicast . . . . . . . . . . . . 13
       4.4.1.  Goals  . . . . . . . . . . . . . . . . . . . . . . . . 13
       4.4.2.  Message Flow . . . . . . . . . . . . . . . . . . . . . 14
     4.5.  ANCP based OAM . . . . . . . . . . . . . . . . . . . . . . 14
       4.5.1.  Message Flow . . . . . . . . . . . . . . . . . . . . . 15
   5.  Access Node Control Protocol (ANCP)  . . . . . . . . . . . . . 15
     5.1.  ANCP/TCP connection establishment  . . . . . . . . . . . . 19
     5.2.  ANCP Connection keep-alive . . . . . . . . . . . . . . . . 21
     5.3.  Capability negotiation . . . . . . . . . . . . . . . . . . 21
     5.4.  GSMP Message Extensions for Access Node Control  . . . . . 24
       5.4.1.  General Extensions . . . . . . . . . . . . . . . . . . 24
       5.4.2.  Topology Discovery Extensions  . . . . . . . . . . . . 25
       5.4.3.  Line Configuration Extensions  . . . . . . . . . . . . 35
       5.4.4.  OAM Extensions . . . . . . . . . . . . . . . . . . . . 38
       5.4.5.  Multicast Extensions . . . . . . . . . . . . . . . . . 41
         5.4.5.1.  General well known TLVs  . . . . . . . . . . . . . 42
           5.4.5.1.1.  Target TLV . . . . . . . . . . . . . . . . . . 42
           5.4.5.1.2.  Command TLV  . . . . . . . . . . . . . . . . . 43
           5.4.5.1.3.  Status-Info TLV  . . . . . . . . . . . . . . . 44
         5.4.5.2.  Multicast Replication Control Message  . . . . . . 45
         5.4.5.3.  Multicast Status Message . . . . . . . . . . . . . 51
     5.5.  ATM-specific considerations  . . . . . . . . . . . . . . . 53
     5.6.  Ethernet-specific considerations . . . . . . . . . . . . . 54
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 54
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 59
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 60
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 60
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 60
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 60
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 61





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1.  Specification Requirements

   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].


2.  Introduction

   DSL is a widely deployed access technology for Broadband Access for
   Next Generation Networks.  Several specifications like [TR-059],
   [TR-058], [TR-092] describe possible architectures for these access
   networks.  In the scope of these specifications are the delivery of
   voice, video and data services.

   When deploying value-added services across DSL access networks,
   special attention regarding quality of service and service control is
   required, which implies a tighter coordination between network
   elements in the broadband access network without burdening the OSS
   layer.

   This draft defines extensions and modifications to GSMPv3 (specified
   in [RFC3292]) and certain new mechanisms to realize a control plane
   between a service-oriented layer 3 edge device (the NAS) and a layer2
   Access Node (e.g.  DSLAM) in order to perform QoS-related, service-
   related and subscriber-related operations.  The control protocol as a
   result of these extensions and mechanisms is referred to as "Access
   Node Control Protocol" (ANCP).

   ANCP uses the option of transporting GSMPv3 over TCP/IP.  TCP
   encapsulation for GSMPv3 is defined in [RFC3293].  GSMPv3
   encapsulation directly over Ethernet and ATM as defined in [RFC3293]
   is not considered for ANCP.

   ANCP uses a subset of GSMPv3 messages to implement currently defined
   use-cases.  These relevant GSMPv3 messages are identified in section
   Section 5.  GSMPv3 procedures with suitable extensions, as used by
   ANCP, are described in sections Section 5.1, Section 5.2 and
   Section 5.3.  GSMPv3 general extensions and GSMPv3 message specific
   extensions required by ANCP are described in sub-sections of
   Section 5.4.  In addition to specifying extensions and modifications
   to relevant GSMP messages applicable to ANCP, this draft also defines
   the usage of these messages by ANCP.  Not all the fields in relevant
   GSMP messages are used by ANCP.  This draft indicates the value that
   ANCP should set for the fields in these GSMP messages.






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2.1.  Terminology

   o  Access Node (AN): Network device, usually located at a service
      provider central office or street cabinet that terminates access
      (local) loop connections from subscribers.  In case the access
      loop is a Digital Subscriber Line (DSL), the Access Node provides
      DSL signal termination, and is referred to as DSL Access
      Multiplexer (DSLAM).

   o  Network Access Server (NAS): Network element which aggregates
      subscriber traffic from a number of Access Nodes.  The NAS is an
      injection point for policy management and IP QoS in the access
      network.  IT is also referred to as Broadband Network Gateway
      (BNG) or Broadband Remote Access Server (BRAS).

   o  Home Gateway (HGW): Network element that connects subscriber
      devices to the Access Node and the access network.  In case of
      DSL, the Home Gateway is a DSL network termination that could
      either operate as a layer 2 bridge or as a layer 3 router.  In the
      latter case, such a device is also referred to as a Routing
      Gateway (RG).

   o  Net Data Rate: portion of the total data rate of the DSL line that
      can be used to transmit actual user information (e.g.  ATM cells
      of Ethernet frames).  It excludes overhead that pertains to the
      physical transmission mechanism (e.g. trellis coding in case of
      DSL).  This is defined in section 3.39 of ITU-T G.993.2.

   o  DSL line (synch) rate: the total data rate of the DSL line,
      including the overhead attributable to the physical transmission
      mechanism.

   o  DSL multi-pair bonding: method for bonding (or aggregating)
      multiple xDSL lines into a single bi-directional logical link,
      henceforth referred to in this draft as "DSL bonded circuit".  DSL
      "multi-pair" bonding allows an operator to combine the data rates
      on two or more copper pairs, and deliver the aggregate data rate
      to a single customer.  ITU-T recommendations G.998.1 and G.998.2
      respectively describe ATM and Ethernet based multi-pair bonding.


3.   Broadband Access Aggregation

3.1.  ATM-based broadband aggregation

   End to end DSL network consists of network and application service
   provider networks (NSP and ASP networks), regional/access network,
   and customer premises network.  Figure 1 shows ATM broadband access



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   network components.

   The Regional/Access Network consists of the Regional Network, Network
   Access Server, and the Access Network as show in Figure 1.  Its
   primary function is to provide end-to-end transport between the
   customer premises and the NSP or ASP.  The Access Node terminates the
   DSL signal.  It could consist of DSLAM in the central office, or
   remote DSLAM, or a Remote Access Multiplexer (RAM).  Access node is
   the first point in the network where traffic on multiple DSL lines
   will be aggregated onto a single network.  The NAS performs multiple
   functions in the network.

   The NAS is the aggregation point for the subscriber traffic.  It
   provides aggregation capabilities (e.g.  IP, PPP, ATM) between the
   Regional/Access Network and the NSP or ASP.  These include
   traditional ATM-based offerings and newer, more native IP-based
   services.  This includes support for Point-to-Point Protocol over ATM
   (PPPoA) and PPP over Ethernet (PPPoE), as well as direct IP services
   encapsulated over an appropriate layer 2 transport.

   Beyond aggregation, NAS is also the injection point for policy
   management and IP QoS in the Regional/Access Networks.  In order to
   allow IP QoS support over an existing non-IP-aware layer 2 access
   network without using multiple layer 2 QoS classes, a mechanism based
   on hierarchical scheduling is used.  This mechanism defined in
   [TR-059], preserves IP QoS over the ATM network between the NAS and
   the RGs by carefully controlling downstream traffic in the NAS, so
   that significant queuing and congestion does not occur further down
   the ATM network.  This is achieved by using a diffserv-aware
   hierarchical scheduler in the NAS that will account for downstream
   trunk bandwidths and DSL synch rates.

   [ANCP-FRAMEWORK] provides detailed definition and functions of each
   network element in the broadband reference architecture.

















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     Access                   Customer
                       <--- Aggregation -->  <------- Premises ------->
                              Network                   Network

                       +------------------+ +--------------------------+
   +---------+   +---+ | +-----+ +------+ |-|+-----+ +---+ +---------+ |
NSP|         | +-|NAS|-| |ATM  |-|Access| | ||DSL  |-|HGW|-|Subscriber||
---+ Regional| | +---+ | +-----+ | Node | | ||Modem| +---+ |Devices   ||
   |Broadband| | +---+ |         +------+ | |+-----+       +----------+|
ASP|Network  |-+-|NAS| +--------------|---+ +--------------------------+
---+         | | +---+                |     +--------------------------+
   |         | | +---+                |     |+-----+ +---+ +----------+|
   +---------+ +-|NAS|                +-----|| DSL |-|HGW|-|Subscriber||
                 +---+                      ||Modem| +---+ |Devices   ||
                                            |+-----+       +----------+|
                                            +--------------------------+
 HGW   : Home Gateway
 NAS   : Network Access Server


               Figure 1: ATM Broadband Aggregation Topology

3.2.  Ethernet-based broadband aggregation

   The Ethernet aggregation network architecture builds on the Ethernet
   bridging/switching concepts defined in IEEE 802.  The Ethernet
   aggregation network provides traffic aggregation, class of service
   distinction, and customer separation and traceability.  VLAN tagging
   defined in IEEE 802.1Q and being enhanced by IEEE 802.1ad is used as
   standard virtualization mechanism in the Ethernet aggregation
   network.  The aggregation devices are "provider edge bridges" defined
   in IEEE 802.ad.  Stacked VLAN tags provide one possible way to create
   equivalent of "virtual paths" and "virtual circuits" in the
   aggregation network.  The "outer" vlan could be used to create a form
   of "virtual path" between a given DSLAM and a given NAS.  And "inner"
   VLAN tags to create a form of "virtual circuit" on a per DSL line
   basis.  This is 1:1 VLAN allocation model.  An alternative model is
   to bridge sessions from multiple subscribers behind a DSLAM into a
   single VLAN in the aggregation network.  This is N:1 VLAN allocation
   model.  Architectural and topological models of an Ethernet
   aggregation network in context of DSL aggregation are defined in
   [TR-101]


4.  Access Node Control Protocol






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4.1.   Overview

   A dedicated control protocol between NAS and access nodes can
   facilitate "NAS managed" tight QOS control in the access network,
   simplified OSS infrastructure for service management, optimized
   multicast replication to enable video services over DSL, subscriber
   statistics retrieval on the NAS for accounting purposes, and fault
   isolation capability on the NAS for the underlying access technology.
   This dedicated control plane is referred to as "Access Node Control
   Protocol" (ANCP).  This document specifies relevant extensions to
   GSMPv3 as defined [RFC3292] to realize ANCP.

   Following sections discuss the use of ANCP for implementing:

   o  Dynamic discovery of access topology by the NAS to provide tight
      QOS control in the access network.

   o  Pushing to the access-nodes, subscriber and service data retrieved
      by the NAS from an OSS system (e.g. radius server), to simplify
      OSS infrastructure for service management.

   o  Optimized, "NAS controlled and managed" multicast replication by
      access-nodes at L2 layer.

   o  NAS controlled, on-demand access-line test capability (rudimentary
      end-to-end OAM).

   In addition to DSL, alternate broadband access technologies (e.g.
   Metro-Ethernet, Passive Optical Networking, WiMax) will have similar
   challenges to address, and could benefit from the same approach of a
   control plane between a NAS and an Access Node (e.g.  OLT), providing
   a unified control and management architecture for multiple access
   technologies, hence facilitating migration from one to the other
   and/or parallel deployments.

   GSMPv3 is an ideal fit for implementing ANCP.  It is extensible and
   can be run over TCP/IP, which makes it possible to run over different
   access technologies.

4.2.  ANCP based Access Topology Discovery

4.2.1.   Goals

   [TR-059] discusses various queuing/scheduling mechanisms to avoid
   congestion in the access network while dealing with multiple flows
   with distinct QoS requirements.  Such mechanisms require that the NAS
   gains knowledge about the topology of the access network, the various
   links being used and their respective net data rates.  Some of the



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   information required is somewhat dynamic in nature (e.g.  DSL sync
   rate, and therefore also the net data rate), hence cannot come from a
   provisioning and/or inventory management OSS system.  Some of the
   information varies less frequently (e.g. capacity of a DSLAM uplink),
   but nevertheless needs to be kept strictly in sync between the actual
   capacity of the uplink and the image the NAS has of it.

   Following section describes ANCP messages that allow the Access Node
   (e.g.  DSLAM) to communicate to the NAS, access network topology
   information and any corresponding updates.

   Some of the parameters that can be communicated from the DSLAM to the
   NAS include DSL line state, actual upstream and downstream net data
   rates of a synchronized DSL link, maximum attainable upstream and
   downstream net data rates, interleaving delay etc.  Topology
   discovery is specifically important in case the net data rate of the
   DSL line changes over time.  The DSL net data rate may be different
   every time the DSL modem is turned on.  Additionally, during the time
   the DSL modem is active, data rate changes can occur due to
   environmental conditions (the DSL line can get "out of sync" and can
   retrain to a lower value).

4.2.2.  Message Flow

   When a DSL line initially comes up or resynchronizes to a different
   rate, the DSLAM generates and transmits a GSMP PORT UP EVENT message
   to the NAS.  The extension field in the message carries the TLVs
   containing DSL line specific parameters.  On a loss of signal on the
   DSL line, a GSMP PORT DOWN message is generated by the DSLAM to the
   NAS.  In order to provide expected service level, NAS needs to learn
   the initial attributes of the DSL line before the subscriber can log
   in and access the provisioned services for the subscriber.  Figure 2
   summarizes the interaction.


















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            <----- Port UP(EVENT Message)  <----- DSL
                 (default line parameters)       Signal

   1.  NAS ------------------ Access -----------  Home ----- Subscriber
                               Node              Gateway


            <----- Port UP (EVENT Message)  <----- DSL
                  (updated line parameters)      Resynch
   2.  NAS ------------------ Access ----------- Home ------ Subscriber
                               Node             Gateway

           <--- Port DOWN (EVENT Message) <---- DSL
                                              Loss of Signal

   3.  NAS ----------------- Access ------------- Home ----- Subscriber
                              Node              Gateway

       Figure 2: Message flow (ANCP mapping) for topology discovery

   The Event message with PORT UP message type (80) is used for
   conveying DSL line attributes to the NAS.  This message with relevant
   extensions is defined in section Section 5.4.2.

4.3.  ANCP based Line Configuration

4.3.1.   Goals

   Following dynamic discovery of access topology (identification of DSL
   line and its attributes) as assisted by the mechanism described in
   the previous section (topology discovery), the NAS could then query a
   subscriber management OSS system (e.g.  RADIUS server) to retrieve
   subscriber authorization data (service profiles, aka user
   entitlement).  Most of such service mechanisms are typically enforced
   by the NAS itself, but there are a few cases where it might be useful
   to push such service parameter to the DSLAM for local enforcement of
   a mechanism (e.g.  DSL-related) on the corresponding subscriber line.
   One such example of a service parameter that can be pushed to the
   DSLAM for local enforcement is DSL "interleaving delay".  Longer
   interleaving delay (and hence stringent error correction) is required
   for a video service to ensure better video "quality of experience",
   whereas for a VoIP service or for "shoot first" gaming service, a
   very short interleaving delay is more appropriate.  Another relevant
   application is downloading per subscriber multicast channel
   entitlement information in IPTV applications where the DSLAM is
   performing IGMP snooping or IGMP proxy function.  Using ANCP, the NAS
   could achieve the goal of pushing line configuration to the DSLAM by
   an interoperable and standardized protocol.



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   If a subscriber wants to choose a different service, it can require
   an OPEX intensive reconfiguration of the line via a network operator,
   possibly implying a business-to-business transaction between an ISP
   and an access provider.  Using ANCP for line configuration from the
   NAS dramatically simplifies the OSS infrastructure for service
   management, allowing fully centralized subscriber-related service
   data (e.g.  RADIUS server back-end) and avoiding complex cross-
   organization B2B interactions.

   The best way to change line parameters would be by using profiles.
   These profiles (DSL profiles for different services) are pre-
   configured on the DSLAMs.  The NAS can then indicate a reference to
   the right DSL profile via ANCP.  Alternatively, discrete DSL
   parameters can also be conveyed by the NAS in ANCP.

4.3.2.  Message Flow

   Triggered by topology information reporting a new DSL line or
   triggered by a subsequent user session establishment (PPP or DHCP),
   the NAS may send line configuration information (e.g. reference to a
   DSL profile) to the DSLAM using GSMP Port Management messages.  The
   NAS may get such line configuration data from a policy server (e.g.
   RADIUS).  Figure 3 summarizes the interaction.




























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                                  1.DSL Signal
                                   <-----------
           2. Port UP (EVENT Message)
          (Access Topology Discovery)
                  <----------------
                              3. PPP/DHCP Session
                    <--------------------------------
     4. Authorization
    & Authentication
     <-------------------
                    Port Management Message
                    (Line Configuration)
                  5. -------->
   +----------+   +-----+     +-----+    +-------+    +-----------+
   |Radius/AAA|---| NAS |-----| AN  |----|  Home |----|Subscriber |
   |Policy    |   +-----+     +-----+    |Gateway|    +-----------+
   |Server    |                          +-------+
   +----------+




   Figure 3: Message flow - ANCP mapping for Initial Line Configuration

   The NAS may update the line configuration due to a subscriber service
   change (e.g. triggered by the policy server).  Figure 4 summarizes
   the interaction.
























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                                              1. PPP/DHCP Session
                       <------------------------------------------

     +-----------+                      2. Service On Demand
     |           |<-----------------------------------------------
     | Web portal|
     |  OSS etc  | 3.Change of   4.Port Management
     |           | Authorization   Message
     |Radius AAA | -------->     (Updated Line
     |  Policy   |                Config - New Profile)
     |           |          ------------->
     |           |    +------+     +-------+   +---------+  +----------+
     |           |----| NAS  |-----|  AN   |---|  Home   |--|Subscriber|
     |           |    +------+     +-------+   | Gateway |  +----------+
     +-----------+                             +---------+

   Figure 4: Message flow - ANCP mapping for Updated Line Configuration

   The format of relevant extensions to port management message is
   defined in section Section 5.4.3.  The line configuration models
   could be viewed as a form of delegation of authorization from the NAS
   to the DSLAM.

4.4.  ANCP based Transactional Multicast

4.4.1.  Goals

   Typical IP multicast in access networks involves the NAS terminating
   user requests for receiving multicast channels via IGMP.  The NAS
   authorizes the subscriber, and dynamically determines the multicast
   subscription rights for the subscriber.  Based on the user's
   subscription, the NAS can replicate the same multicast stream to
   multiple subscribers.  This leads to a waste of access bandwidth if
   multiple subscribers access network services via the same access-node
   (e.g.  DSLAM).  The amount of multicast replication is of the order
   of number of subscribers rather than the number of access-nodes.  It
   is ideal for NAS to send a single copy of the multicast stream to a
   given access-node, and let the access-node perform multicast
   replication by layer2 means (e.g.  ATM point-to-multipoint cell
   replication or Ethernet data-link bridging) for subscribers behind
   the access-node.  However, operationally, NAS is the ideal choice to
   handle subscriber management functions (authentication,
   authorization, accounting and address management), multicast policies
   such as per-channel authorization, and complex multicast routing
   protocols.  Therefore, some means is needed for the NAS to setup
   multicast replication state in the access-nodes.  In ATM access
   networks, ANCP can be used by the NAS to setup P2MP cross-connects in
   the DSLAMs.  Protocol support for this use-case is defined in section



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   Section 5.4.5

4.4.2.  Message Flow

   The Multicast Replication Control Message is sent by the NAS to the
   AN with a directive to either join or leave one or more multicast
   flows.  The AN will use a Multicast Status Message when conveying the
   outcome of the directive.  The message flows in Figure 5 illustrates
   the behavior of the AN in case of receiving a Multicast Replication
   Control Message.

   +----------+    +-------+     +-----+        ANCP          +-----+
   |Subscriber|    | Home  |     | AN  |<-------------------->| NAS |
   +----------+    |Gateway|     +-----+                      +-----+
         |         +-------+         |                           |
         |            |              | Multicast-Replication-Crl |
         |            |              |(Target,add, Flowi..Flowj) |
         |            |              |<--------------------------|
         |       Mcast Flow 1        |                           |
         |<==========================+                           |
         |            |              |     Multicast-Status      |
         |            |              |-------------------------->|
         |            |              |                           |
         |            |              | Multicast-Replication-Crl |
         |            |              |(Target,delete,Flowi.Flowj)|
         |            |              |<--------------------------|
         |            |              |                           |
         |  <Stop Replication of     X                           |
         |            Mcast Flow 1>  |     Multicast-Status      |
         |            |              |-------------------------->|

              Figure 5: NAS-Controlled Multicast Replication

4.5.  ANCP based OAM

   In a mixed Ethernet and ATM access network (including the local
   loop), it is desirable to provide similar mechanisms for connectivity
   checks and fault isolation, as those used in an ATM based
   architecture.  This can be achieved using an ANCP based mechanism
   until end-to-end Ethernet OAM mechanisms are more widely implemented
   in various network elements.

   A simple solution based on ANCP can provide NAS with an access-line
   test capability and to some extent fault isolation.  Controlled by a
   local management interface the NAS can use an ANCP operation to
   trigger the access-node to perform a loopback test on the local-loop
   (between the access-node and the CPE).  The access-node can respond
   via another ANCP operation the result of the triggered loopback test.



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   In case of ATM based local-loop the ANCP operation can trigger the
   access-node to generate ATM (F4/F5) loopback cells on the local loop.
   In case of Ethernet, the access-node can trigger an Ethernet loopback
   message(per EFM OAM) on the local-loop.

4.5.1.  Message Flow

   "Port Management" message can be used by the NAS to request access
   node to trigger a "remote loopback" test on the local loop.  The
   result of the loopback test can be asynchronously conveyed by the
   access node to the NAS in a "Port Management" response message.  The
   format of relevant extensions to port management message is defined
   in section The format of relevant extensions to port management
   message is defined in section Section 5.4.4.  Figure 6 summarizes the
   interaction.

                  Port Management Message
                  (Remote Loopback          ATM loopback
                   Trigger Request)         OR EFM Loopback
                1.  ---------------->     2. --------->
                                             <--------+
 +-------------+    +-----+       +-------+           +----------------+
 |Radius/AAA   |----|NAS  |-------| DSLAM |-----------|    CPE         |
 |Policy Server|    +-----+       +-------+           | (DSL Modem +   |
 +-------------+                                      |Routing Gateway)|
                                                      +----------------+
                     3. <---------------
                     Port Management Message
                (Remote Loopback Test Response)


                  Figure 6: Message Flow: ANCP based OAM


5.  Access Node Control Protocol (ANCP)

   ANCP uses a subset of GSMPv3 messages described in [RFC3292] to
   implement currently defined use-cases.  GSMPv3 general message
   format, used by all GSMP messages other than adjacency protocol
   messages, is defined in section 3.1.1 of GSMPv3 [RFC3292].  ANCP
   modifies this base GSMPv3 message format.  The modified GSMPv3
   message format is defined as follows:









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       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  | Message Type  | Result|        Code           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Partition ID  |            Transaction Identifier             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |I|      SubMessage Number      |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                          Message Payload                      ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                 Figure 7: Modified GSMPv3 message format

   The 8-bit version field in the base GSMPv3 message header is split
   into two 4 bit fields for carrying the version and a sub-version of
   the GSMP protocol.  ANCP uses version 3 and sub-version 1 of the GSMP
   protocol.  An ANCP implementation SHOULD always set the version field
   to 3, and the sub-version field to 1.  The Result field in the
   message header has been modified to be 4 bits long, and the Code
   field to be 12 bits long.

   Version:

        The version number of the GSMP protocol being used in this
        session.  ANCP uses version 3.

   Sub-Version:

        The sub-version number of the GSMP protocol being used in this
        session.  ANCP uses sub-version 1 of the GSMP protocol.

   Result:

      The Result field derived from GSMP [RFC3292] has the following
      codes:



         Ignore:

            Res = 0x00 - Ignore this field on receipt and follow the
            procedures specified for the received message type.

         Nack:



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            Res = 0x01 - Result code indicating that no response is
            expected to the message other than in cases of failure
            caused during the processing of the message contents or that
            of the contained directive(s).



         AckAll:



            Res = 0x02 - Result code indicating that a response to the
            message is requested in all cases.  It is specifically
            intended to be used in some cases for Request messages only,
            and is not to be used in Event messages.



         Success:



            Res = 0x03 - Set by receiver to indicate successful
            execution of all directives in the corresponding Request
            message.



         Failure:



            Res = 0x4 - Set by receiver in the Response message if one
            or more directives in the corresponding Request message
            fails.



   Message-Type:

      The GSMP and ANCP message type.

   Code:

      This field gives further information concerning the result in a
      response message.  It is mostly used to pass an error code in a
      failure response but can also be used to give further information
      in a success response message or an event message.  In a request



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      message, the code field is not used and is set to zero.  In an
      adjacency protocol message, the Code field is used to determine
      the function of the message.

   Partition ID:

      This field is a 8 bit number which signifies a partition on the
      AN. [ TBD How AN and NAS agree on the partition numbers.  Possible
      options:

      1 - The partition ID could be configured on the AN and learnt by
      NAS in the adjacency message;

      2 - The partition ID could be statically configured on the NAS as
      part of configuring the neighbor information.]

   Transaction ID:

      24-bit field set by the sender of a Request message to associate a
      Response message with the original Request message.  The receiver
      of a Request message reflects the transaction ID from the Request
      message in the corresponding Response message.  For event
      messages, the transaction identifier SHOULD be set to zero.  The
      Transaction Identifier is not used, and the field is not present,
      in the adjacency protocol.  The specific use of transaction ID as
      applicable to multicast use case is defined in Section 5.4.5

   I flag:

      An ANCP implementation SHOULD set "I" and subMessage fields to 1
      to signify no fragmentation.

   Length:

      Length of the GSMP message including its header fields and defined
      GSMP message body.

   Additional General Message Information:

   o  Any field in a GSMP message that is unused or defined as
      "reserved" MUST be set to zero by the sender and ignored by the
      receiver;

   o  Flags that are undefined will be designated as: x: reserved.

   Following are the relevant GSMPv3 messages defined in [RFC3292], that
   are currently used by ANCP.  Other than the message types explicitly
   listed below, no other GSMPv3 messages are used by ANCP currently.



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   o  Event Messages

      *  Port UP Message

      *  Port DOWN Message

      These messages are used by ANCP topology discovery use-case.

   o  Port Management Messages

      *  These messages are used by ANCP "line configuration" use-case
         and ANCP OAM use-case.

   o  Adjacency Protocol Messages

      *  These messages are used to bring up a protocol adjacency
         between a NAS and an AN.

   ANCP modifies and extends few basic GSMPv3 procedures.  These
   modifications and extensions are summarized below, and described in
   more detail in the succeeding sections.

   o  ANCP provides support for a capability negotiation mechanism
      between ANCP peers by extending the GSMPv3 adjacency protocol.
      This mechanism and corresponding adjacency message extensions are
      defined in section Section 5.3

   o  TCP connection establishment procedure in ANCP deviates slightly
      from the connection establishment in GSMPv3 as specified in
      [RFC3293].  This is described in section Section 5.1

   o  ANCP makes GSMPv3 messages extensible and flexible by adding a
      general "extension block" to the end of the relevant GSMPv3
      messages.  The "extension block" contains a TLV structure to carry
      information relevant to each ANCP use-case.  The format of the
      "extension block" is defined in section Section 5.4.1.1.

   o

5.1.  ANCP/TCP connection establishment

   ANCP will use TCP for exchanging protocol messages [RFC3293]. defines
   the GSMP message encapsulation for TCP.  The TCP session is initiated
   from the DSLAM (access node) to the NAS (controller).  This is
   necessary to avoid static provisioning on the NAS for all the DSLAMs
   that are being served by the NAS.  It is easier to configure a given
   DSLAM with the single IP address of the NAS that serves the DSLAM.
   This is a deviation from [RFC3293] which indicates that the



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   controller initiates the TCP connection to the switch.

   When GSMP messages are sent over a TCP connection a four-byte TLV
   header field is prepended to the GSMP message to provide delineation
   of GSMP messages within the TCP stream.

       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |        Type (0x88-0C)         |           Length              |
      |-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                         GSMP Message                          ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


         Figure 8: GSMPv3 with TCP/IP Encapsulation message format

   Type

        This 2-byte field indicates the type code of the following
        message.  The type code for GSMP messages is 0x88-0C (i.e., the
        same as GSMP's Ethertype).

   Length

        This 2-byte unsigned integer indicates the total length of the
        GSMP message only.  It does not include the 4-byte TLV header.

   NAS listens for incoming connections from the access nodes.  Port
   6068 is used for TCP connection.  Adjacency protocol messages, which
   are used to synchronize the NAS and access-nodes and maintain
   handshakes, are sent after the TCP connection is established.  ANCP
   messages other than adjacency protocol messages may be sent only
   after the adjacency protocol has achieved synchronization.

   In the case of ATM access, a separate PVC (control channel) capable
   of transporting IP would be configured between NAS and the DSLAM for
   ANCP messages.

   In case of an Ethernet access/aggregation network, a typical practice
   is to send the Access Node Control Protocol messages over a dedicated
   Ethernet Virtual LAN (VLAN) using a separate VLAN identifier (VLAN
   ID).






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5.2.  ANCP Connection keep-alive

   GSMPv3 defines an adjacency protocol.  The adjacency protocol is used
   to synchronize states across the link, to negotiate which version of
   the GSMP protocol to use, to discover the identity of the entity at
   the other end of a link, and to detect when it changes.  GSMP is a
   hard state protocol.  It is therefore important to detect loss of
   contact between switch and controller, and to detect any change of
   identity of switch or controller.  No protocol messages other than
   those of the adjacency protocol may be sent across the link until the
   adjacency protocol has achieved synchronization.  There are no
   changes to the base GSMP adjacency protocol for implementing ANCP.

   The NAS will set the M-flag in the SYN message (signifying it is the
   master).  Once the adjacency is established, periodic adjacency
   messages (type ACK) are exchanged.  The default ACK interval as
   advertised in the adjacency messages is 10 sec for ANCP.  It SHOULD
   be configurable and is an implementation choice.  It is recommended
   that both ends specify the same timer value.  However, it is not
   necessary for the timer values to match.

   The GSMP adjacency message defined in [RFC3292] is extended for ANCP
   and is shown in section 5.3 immediately following this section.  The
   8-bit "version" field in the adjacency protocol messages is modified
   to carry the version and sub-version of the GSMP protocol for version
   negotiation.  ANCP uses version 3 and sub-version 1 of GSMP protocol.
   The semantics and suggested values for Code, "Sender Name", "Receiver
   Name", "Sender Instance", and "Receiver Instance" fields are as
   defined in [RFC3292].  The "Sender Port", and "Receiver Port" should
   be set to 0 by both ends.  The pType field should be set to 0.  The
   pFlag should be set to 1.

   If the adjacency times out on either end, due to not receiving an
   adjacency message for a duration of (3 * Timer value), where the
   timer value is specified in the adjacency message, all the state
   received from the ANCP neighbor should be cleaned up, and the TCP
   connection should be closed.  The NAS would continue to listen for
   new connection requests.  The DSLAM will try to re-establish the TCP
   connection and both sides will attempt to re-establish the adjacency.

   The handling defined above will need some modifications when ANCP
   graceful restart procedures are defined.  These procedures will be
   defined in a separate draft.

5.3.  Capability negotiation

   The adjacency message as defined in [RFC3292] is extended to carry
   technology specific "Capability TLVs".  Both the NAS and the access



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   node will advertise supported capabilities in the originated
   adjacency messages.  If a received adjacency message indicates
   absence of support for a capability that is supported by the
   receiving device, it will turn off the capability locally and will
   send an updated adjacency message with the capability turned off to
   match the received capability set.  This process will eventually
   result in both sides agreeing on the minimal set of supported
   capabilities.  The adjacency will not come up unless the capabilities
   advertised by the controller and the controlled device match.

   After initial synchronization, if at anytime a capability mismatch is
   detected, the adjacency will be brought down (RSTACK will be
   generated by the device detecting the mismatch), and synchronization
   will be re-attempted.

       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   Ver |  Sub  | Message Type  |     Timer     |M|     Code    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          Sender Name                          |
      +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                               |                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
      |                         Receiver Name                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          Sender Port                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         Receiver Port                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | PType | PFlag |               Sender Instance                 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Partition ID  |              Receiver Instance                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Tech Type     | # of TLVs     | Total Length                  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                   Capability TLVs                             ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                                 Figure 9

   The format of capability TLV is:






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      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Capability Type         |   Capability Length             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                                                               ~
      ~                   Capability Data                             ~
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                         Figure 10: Capability TLV

   The Tech Type field type indicates the technology to which the
   capability extension applies.  For access node control in case of DSL
   networks, new type "DSL" is proposed.  The value for this field is
   0x05.  This is the first available value in the range that is not
   currently allocated.  It will need to be reserved with IANA.

   Capability length is the number of actual bytes contained in the
   value portion of the TLV.  The TLV is padded to a 4-octet alignment.
   Therefore, a TLV with no data will contain a zero in the length field
   (if capability data is three octets, the length field will contain a
   three, but the size of the actual TLV is eight octets).  Capability
   data field can be empty if the capability is just a boolean.  In case
   the capability is a boolean, it is inferred from the presence of the
   TLV (with no data).

   Capability data provides the flexibility to advertise more than mere
   presence or absence of a capability.  Capability types can be
   registered with IANA.  Following capabilities are defined for ANCP as
   applied to DSL access:

   1.  Capability Type : Dynamic-Topology-Discovery = 0x01

          Length (in bytes) : 0

          Capability Data : NULL

   2.  Capability Type : Line-Configuration = 0x02

          Length (in bytes) : 0

          Capability Data : NULL

   3.  Capability Type : Transactional-Multicast = 0x03 (controller i.e.
       NAS terminates IGMP messages from subscribers, and via l2 control
       protocol, signals state to the access-nodes (e.g.  DSLAMs) to
       enable layer2 replication of multicast streams.  In ATM access
       network this implies that NAS instructs the access-node to setup



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       a P2MP cross-connect.  The details of this will be covered in a
       separate ID.

          Length (in bytes) : 0

          Capability Data : NULL

   4.  Capability Type : OAM = 0x04

          Length (in bytes) : 0

          Capability Data : NULL

5.4.  GSMP Message Extensions for Access Node Control

5.4.1.  General Extensions

   Extensions to GSMP messages for various use-cases of "Access Node
   Control" mechanism are defined in sections Section 5.4.2 to
   Section 5.4.5.  However, sub-sections Section 5.4.1.1 below define
   extensions to GSMP that have general applicability.

5.4.1.1.  Extension TLV

   In order to provide flexibility and extensibility certain GSMP
   messages such as "PORT MANAGEMENT" and "EVENT" messages defined in
   [RFC3292] have been modified to include an extension block that
   follows a TLV structure.  Individual messages in the following
   sections describe the usage and format of the extension block.

   All Extension TLVs will be designated as follow:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |x|x|x|x|x|x|x|x| Message Type  |   Tech Type   | Block Length  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                         Extension Value                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                         Figure 11: Extension TLV

      x: Reserved Flags






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         These are generally used by specific messages and will be
         defined in those messages.

      Message Type

         An 8-bit field corresponding to the message type where the
         extension block is used.

      Tech Type

         An 8-bit field indicating the applicable technology type value.
         The Message Type plus the Tech Value uniquely define a single
         Extension Type and can be treated as a single 16 bit extension
         type.  "Tech Type" value of 0x05 SHOULD be used by ANCP for DSL
         technology.

            0x00 Extension block not in use.

            0x01 - 0x04 Already in use by various technologies

            0x05 DSL

            0x06 - 0xFE Reserved

            0xFF Base Specification Use

      Block Length

         A 8-bit field indicating the length of the Extension Value
         field in bytes.  When the Tech Type = 0x00, the length value
         MUST be set to 0.

      Extension Value

         A variable length field that is an integer number of 32 bit
         words long.  The Extension Value field is interpreted according
         to the specific definitions provided by the messages in the
         following sections..



5.4.2.  Topology Discovery Extensions

   The GSMP Event message with PORT UP message type (80) is used for
   conveying DSL line attributes to the NAS.  The message SHOULD be
   generated when a line first comes UP, or any of the attributes of the
   line change e.g. the line re-trains to a different rate or one or
   more of the configured line attributes are administratively modified.



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   Also, when the ANCP session first comes up, the DSLAM SHOULD transmit
   a PORT UP message to the NAS for each line that is up.  When a DSL
   line goes down (idle or silent), the DSLAM SHOULD transmit an Event
   message with PORT DOWN message type (81) to the NAS.  It is
   recommended that the DSLAMs use a dampening mechanism per DSL line to
   control the rate of state changes per DSL line, communicated to the
   NAS.

   Not all the fields in GSMP Event message are applicable to ANCP.  The
   fields that are not applicable MUST be set to zero by the ANCP sender
   and ignored by the ANCP receiver.  The fields in the PORT UP and PORT
   DOWN messages to be set by the ANCP sender, and corresponding
   handling by the ANCP receiver is described below.

   The version field MUST be set to 3, and the sub field MUST be set to
   1.  As defined in [RFC3292], the one byte Message Type field MUST be
   set to 80 for PORT UP Event message, and to 81 for PORT DOWN Event
   Message.  The 8 bit Code field MUST be set to 0.  The 4 bit Result
   field MUST be set to 0 (signifying Ignore.)  If a PORT UP message
   with a Result field set to 0 is received by the NAS and the NAS is
   able to process the message correctly, the NAS MUST NOT generate any
   ANCP message in response to the PORT UP.  If the PORT UP message
   received cannot be processed correctly by the NAS (e.g. the message
   is malformed) the NAS MAY respond with an ANCP Error Message (TBD)
   containing the reason of the failure.  The 24-bit Transaction
   Identifier field MUST be set to 0.  The "I" bit and the SubMessage
   field MUST be set to 1 to signify no fragmentation.  The Length field
   is two bytes and MUST contain the length of the message (including
   header and the payload) in bytes.

   The "Port" field, "Port Session Number" field and "Event Sequence
   Number" field are 4 bytes each, and MUST be set to 0 by the ANCP
   sender.  LABEL field in event messages is defined as a TLV in
   [RFC3292].  ANCP does NOT use the Label TLV.  In both PORT UP and
   PORT DOWN event messages an ANCP sender MUST treat the Label field,
   immediately following the "Event Sequence Number" field, as a fixed 8
   byte field, and MUST set these 8 bytes to 0.  The receiver MUST NOT
   interpret the LABEL field as a TLV and MUST ignore the 8 bytes
   immediately following the "Event Sequence Number" field.  In future
   versions of ANCP, if necessary, the un-used fields in GSMP Event
   message, which do not have ANCP specific semantics, can be used
   partially or completely, by re-naming appropriately, and associating
   valid semantics with these fields.

   The Tech Type field is extended with new type "DSL".  The value for
   this field is 0x05.

   In case of bonded copper loops to the customer premise (as per DSL



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   multi-pair bonding described by [G.988.1] and [G.988.2]), the DSLAM
   MUST report the aggregate net data rate and other attributes for the
   "DSL bonded circuit" (represented as a single logical port) to the
   NAS in a PORT UP message.  Any change in the aggregate net data rate
   of the "DSL bonded circuit" (due to a change in net data rate of
   individual constituent DSL lines or due to change in state of the
   individual constituent DSL lines) MUST be reported by the DSLAM to
   the NAS in a PORT UP message.  The DSLAM MUST also report the
   "aggregate" state of the "DSL bonded circuit" to the NAS via PORT UP
   and PORT DOWN messages.

    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  | Message Type  | Result|        Code           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             Port                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Port Session Number                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     Event Sequence Number                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   +                             Label                             +
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |x|x|x|x|x|x|x|x| Message Type  |   Tech Type   | Block Length  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                         Extension Value                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 12

   The format of the "Extension Value" field for Tech Type "DSL" is as
   follows :










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        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
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |     # of TLVs               | Extension Block length (bytes)  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                            TLVs                               ~
       ~                                                               ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                        Figure 13: Extension Value

   The "Extension Value" contains one or more TLVs to identify a DSL
   line and define its characteristics.  A TLV can consist of multiple
   sub-TLVs.  First 2 byte of the "Extension Value" contains the number
   of TLVs that follow.  The next 2 bytes contain the total length of
   the TLVs carried in the extension block in bytes (existing "Block
   Length" field in the GSMP message is limited to 255 bytes and is not
   sufficient).

   General format of a TLV is :


        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                  |          Length               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                            Value                              ~
       ~                                                               ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                          Figure 14:  General TLV

   The value field in each TLV is padded to a 4-octet alignment.  The
   Length field in each TLV contains the actual number of bytes in the
   TLV (not including the padding if present).  If a TLV is not
   understood by the NAS, it is silently ignored.  Currently defined
   types start from 0x01.

   Following TLVs are currently defined:

   1.  Type (Access-Loop-Circuit-ID = 0x01): This is a mandatory TLV and
       contains an identifier of the subscriber's connection to the
       access node (i.e. "local loop").  The "local loop" can be ATM
       based or Ethernet based.  The "Access Loop Circuit ID" has local
       significance at the access node.  The exact usage on the NAS is



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       beyond the scope of this document.  The format used for "local
       loop" identification in ANCP messages MUST be identical to what
       is used by the access nodes in subscriber signaling messages when
       the access nodes act as "signaling relay agents" as outlined in
       [RFC3046] and [TR-101].

          Length : (up to 63 bytes)

          Value : ASCII string

          For an ATM based local loop the string consists of slot/port
          and VPI/VCI information corresponding to the subscriber's DSL
          connection.  Default syntax for the string inserted by the
          access node as per [TR-101] is:

             "Access-Node-Identifier atm slot/port:vpi.vci"

          The Access-Node-Identifier uniquely identifies the access node
          in the access network.  The slot/port and VPI/VCI uniquely
          identifies the DSL line on the access node.  Also, there is
          one to one correspondence between DSL line and the VC between
          the access node and the NAS.

          For local loop which is Ethernet based (and tagged), the
          string consists of slot/port and VLAN tag corresponding to the
          subscriber.  Default syntax for the string inserted by the
          access node as per [TR-101] is:

             "Access-Node-Identifier eth slot/port[:vlan-id]"

   2.  Type (Access-Loop-Remote-Id = 0x02): This is an optional TLV and
       contains an identifier to uniquely identify a user on a local
       loop on the access node.  The exact usage on the NAS is out of
       scope of this document.  It is desirable that the format used for
       the field is similar to what is used by the access nodes in
       subscriber signaling messages when the access nodes act as
       "signaling relay agents" as outlined in [RFC3046] and [TR-101].

          Length : (up to 63 bytes)

          Value : ASCII string

   3.  Type (Access-Aggregation-Circuit-ID-Binary = 0x06)

          Length : (8 bytes)






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          Value : two 32 bit integers

          For ethernet access aggregation, where a per-subscriber
          (stacked) VLAN can be applied (1:1 model defined in [TR-101]),
          the VLAN stack provides a convenient way to uniquely identify
          the DSL line.  The outer VLAN is equivalent to virtual path
          between a DSLAM and the NAS and inner VLAN is equivalent to a
          virtual circuit on a per DSL line basis.  In this scenario,
          any subscriber data received by the access node and
          transmitted out the uplink to the aggregation network will be
          tagged with the VLAN stack assigned by the access node

          This TLV can carry the VLAN tags assigned by the access node
          in the ANCP messages.  The VLAN tags can uniquely identify the
          DSL line being referred to in the ANCP messages, assuming the
          VLAN tags are not in any way translated in the aggregation
          network and are unique across physical ports.  Each 32 bit
          integer (least significant bits) contains a 12 bit VLAN
          identifier (which is part of the VLAN tag defined by IEEE
          802.1Q).

          Also, in case of an ATM aggregation network, where the DSLAM
          is directly connected to the NAS (without an intermediate ATM
          switch), the two values can contain VPI and VCI on the DSLAM
          uplink (and can uniquely identify the DSL line on the DSLAM).

          This is optional.

   4.  Type (Access-Aggregation-Circuit-ID-ASCII = 0x03)

          Length : (up to 63 bytes)

          Value : ASCII string

          This field contains information pertaining to an uplink on the
          access node.  For Ethernet access aggregation, assuming the
          access node assigns VLAN tags (1:1 model), typical format for
          the string is:

             "Access-Node-Identifier eth slot/port [:inner-vlan-
             id][:outer-vlan-id]"

          The slot/port corresponds to the ethernet uplink on the access
          node towards the NAS.







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          For an ATM aggregation network, typical format for the string
          is:

             "Access-Node-Identifier atm slot/port:vpi.vci"

          This TLV allows the NAS to associate the information contained
          in the ANCP messages to the DSL line on the access node.

          If the access node inserts this string in the ANCP messages,
          when referring to local loop characteristics (e.g.  DSL line
          in case of a DSLAM), then it should be able to map the
          information contained in the string uniquely to the local loop
          (e.g.  DSL line).

          On the NAS, the information contained in this string can be
          used to derive an "aggregation network" facing construct (e.g.
          an IP interface) corresponding to the local loop (e.g.  DSL
          line).  The association could be based on "local
          configuration" on the NAS.

          The access node can also convey to the NAS, the
          characteristics (e.g. bandwidth) of the uplink on the access
          node.  This TLV then serves the purpose of uniquely
          identifying the uplink whose characteristics are being
          defined.  A separate set of sub-TLVs will be defined for the
          uplink characteristics (TBD).

          This TLV is optional.

   5.  Type (DSL Line Attributes = 0x04):

          Length : variable (up to 1024 bytes)

          Value : This is a mandatory TLV and consists of one or more
          Sub-TLVs corresponding to DSL line attributes.  No sub-TLVs
          other than the "DSL type" and "DSL line state" SHOULD be
          included in a PORT DOWN message.

          The general format of the sub-TLVs is identical to the general
          TLV format.  The value field in each sub-TLV is padded to a
          4-octet alignment.  The Length field in each sub-TLV contains
          the actual number of bytes in the TLV (not including the
          padding if present).  Current defined sub-TLV types are start
          from 0x81.







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          Following sub-TLVs are currently defined :

          +  Type (DSL-Type = 0x91) : Defines the type of transmission
             system in use.  This is a mandatory TLV.

                Length : (4 bytes)

                Value : (Transmission system : ADSL1 = 0x01, ADSL2 =
                0x02, ADSL2+ = 0x03, VDSL1 = 0x04, VDSL2 = 0x05, SDSL =
                0x06, UNKNOWN = 0x07).

          +  Type (Actual-Net-Data-Upstream = 0x81): Actual upstream net
             data rate on a DSL line.  This is a mandatory TLV.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Actual-Net-Data-Rate-Downstream = 0x82) : Actual
             downstream net data rate on a DSL line.  This is a
             mandatory TLV.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Minimum-Net-Data-Rate-Upstream = 0x83) : Minimum net
             data rate desired by the operator.  This is optional.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Minimum-Net-Data-Rate-Downstream = 0x84) : Minimum
             net data rate desired by the operator.  This is optional.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Attainable-Net-Data-Rate-Upstream = 0x85) : Maximum
             net upstream rate that can be attained on the DSL line.
             This is an optional TLV.

                Length : (4 bytes)






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                Value : (Rate in Kb/sec)

          +  Type (Attainable-Net-Data-Rate-Downstream = 0x86) : Maximum
             net downstream rate that can be attained on the DSL line.
             This is an optional TLV.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Maximum-Net-Data-Rate-Upstream = 0x87) : Maximum net
             data rate desired by the operator.  This is optional.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Maximum-Net-Data-Rate-Downstream = 0x88) : Maximum
             net data rate desired by the operator.  This is optional.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Minimum-Net-Low-Power-Data-Rate-Upstream = 0x89) :
             Minimum net data rate desired by the operator in low power
             state.  This is optional.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Minimum-Net-Low-Power-Data-Rate-Downstream = 0x8A) :
             Minimum net data rate desired by the operator in low power
             state.  This is optional.

                Length : (4 bytes)

                Value : (Rate in Kb/sec)

          +  Type (Maximum-Interleaving-Delay-Upstream = 0x8B) : maximum
             one way interleaving delay.  This is optional.

                Length : (4 bytes)







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                Value : (Time in msec)

          +  Type (Actual-Interleaving-Delay-Upstream = 0x8C) : Value
             corresponding to the interleaver setting.  This is
             optional.

                Length : (4 bytes)

                Value : (Time in msec)

          +  Type (Maximum-Interleaving-Delay-Downstream = 0x8D) :
             maximum one way interleaving delay.  This is optional.

                Length : (4 bytes)

                Value : (Time in msec)

          +  Type (Actual-Interleaving-Delay-Downstream = 0x8E) : Value
             corresponding to the interleaver setting.  This is
             optional.

                Length : (4 bytes)

                Value : (Time in msec)

          +  Type (DSL line state = 0x8F) : The state of the DSL line.
             For PORT UP message, at this time, the TLV is optional
             (since the message type implicitly conveys the state of the
             line).  For PORT DOWN, the TLV is mandatory, since it
             further communicates the state of the line as IDLE or
             SILENT.

                Length : (4 bytes)

                Value : { SHOWTIME = 0x01, IDLE = 0x02, SILENT = 0x03 }

          +  Type (Access Loop Encapsulation = 0x90) : The data link
             protocol and, optionally the encapsulation overhead on the
             access loop.  This is an optional TLV.  However, when this
             TLV is present, the data link protocol MUST minimally be
             indicated.  The encapsulation overhead can be optionally
             indicated.

                Length : (3 bytes)







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                Value : The three bytes (most to least significant) and
                valid set of values for each byte are defined below.

                   Data Link (1 byte): {ATM AAL5 = 0, ETHERNET = 1}

                   Encaps 1 (1 byte): {

                      NA = 0,

                      Untagged Ethernet = 1,

                      Single-tagged Ethernet = 2}

                   Encaps 2 (1 byte):{

                      NA = 0,

                      PPPoA LLC = 1

                      PPPoA NULL = 2,

                      IPoA LLC = 3,

                      IPoA NuLL = 4,

                      Ethernet over AAL5 LLC with FCS = 5,

                      Ethernet over AAL5 LLC without FCS = 6,

                      Ethernet over AAL5 NULL with FCS = 7,

                      Ethernet over AAL5 NULL without FCS = 8}

             If this TLV is present, the Data Link protocol MUST be
             indicated as defined above.  However, the Access Node can
             choose to not convey the encapsulation on the access loop
             by specifying a value of 0 (NA) for the two encapsulation
             fields

5.4.3.  Line Configuration Extensions

   The Port Management message format defined in [RFC3292] has been
   modified to contain an extension block (described above in section
   Section 5.4.1.1) at the end of the message.  Also, the original two
   byte Function field has been modified to contain one byte for the
   Function field indicating a specific action to be taken by the
   recipient of the message, and one byte for X-Function field, which
   could further qualify the action specified in the Function field.



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   Any Function specific data MUST be carried in the extension block.

   Not all the fields in GSMP Port Management message are applicable to
   ANCP.  The fields that are not applicable MUST be set to zero by the
   ANCP sender and ignored by the ANCP receiver.

   The NAS uses the extension block in the Port Management messages to
   convey service attributes of the DSL lines to the DSLAM.  TLVs are
   defined for DSL line identification and service data for the DSL
   lines.  Port number is set to 0 in the message.  A new action type
   "Configure Connection Service Data" (value 0x8) is defined.  The
   "Function" field is set to the action type.  This action type
   indicates to the device being controlled (Access Node i.e.  DSLAM) to
   apply service configuration data contained in the extension value
   (TLVs), to the DSL line (identified by one of the TLVs in the
   extension value).  For the action type "Configure Connection Service
   Data", X-Function field MUST be set to 0.  The Tech Type field is
   extended with new type "DSL".  The value for this field is 0x05.
    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  | Message Type  | Result|        Code           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Partition ID  |            Transaction Identifier             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |I|      SubMessage Number      |           Length              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             Port                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Port Session Number                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     Event Sequence Number                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |R|x|x|x|x|x|x|x|   Duration    |    Function   | X-Function    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Event Flags         |        Flow Control Flags     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |x|x|x|x|x|x|x|x| Message Type  |   Tech Type   | Block Length  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                         Extension Value                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 15

   The format of the "Extension Value" field is as follows:




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        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
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |     # of TLVs               | Extension Block length (bytes)  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                            TLVs                               ~
       ~                                                               ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                        Figure 16: Extension Value

   The "Extension Value" field contains one or more TLVs containing DSL
   line identifier and desired service attributes of the the DSL line.
   First 2 byte of the "Extension Value" contains the number of TLVs
   that follow.  The next 2 bytes contain the total length of the
   extension block in bytes (existing "Block Length" field in the GSMP
   message is limited to 255 bytes and is not sufficient).

   General format of a TLV is:


        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                  |          Length               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                            Value                              ~
       ~                                                               ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                          Figure 17:  General TLV

   The value field is padded to a 4-octet alignment.  The Length field
   in each TLV contains the actual number of bytes in the TLV (not
   including the padding if present).  If a TLV is not understood by the
   access-node, it is silently ignored.  Depending upon the deployment
   scenario, the NAS may specify "Access Loop Circuit-ID" or the "Access
   Aggregation Circuit-ID") as defined in section Section 5.4.1.
   Following TLVs can appear in this message:

   o  Type (Access-Loop-Circuit-ID = 0x01) : defined in section
      Section 5.4.1

   o  Type (Access-Aggregation-Circuit-ID-Binary = 0x06): defined in
      section Section 5.4.1




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   o  Type (Access-Aggregation-Circuit-ID-ASCII = 0x03): defined in
      section Section 5.4.1

   o  Type (Service-Profile-Name = 0x05): Reference to a pre-configured
      profile on the DSLAM that contains service specific data for the
      subscriber.

         Length : (up to 64 bytes)

         Value : ASCII string containing the profile name (NAS learns
         from a policy server after a subscriber is authorized).

      In future, more TLVs MAY be defined for individual service
      attributes of a DSL line (e.g. rates, interleaving delay,
      multicast channel entitlement access-list etc).

5.4.4.  OAM Extensions

   GSMP "Port Management" message (type 32) SHOULD be used by the NAS to
   trigger access node to run a loopback test on the local loop.  The
   message format is defined in section Section 5.4.2.  The version
   field SHOULD be set to 3 and sub-version field SHOULD be set to 1.
   The remaining fields in the GSMP header have standard semantics.  The
   function type used in the request message SHOULD be set to "remote
   loopback" (type = 0x09).  The port, "port session number", "event
   sequence number", duration, "event flags", "flow control flags" and
   code fields SHOULD all be set to 0.  The result field SHOULD be set
   to "AckAll" to indicate requirement for the access node to send a
   success or failure response.  The transaction ID SHOULD contain a
   sequence number inserted by the NAS in each request that it
   generates.

   Not all the fields in GSMP Port Management message are applicable to
   ANCP.  The fields that are not applicable MUST be set to zero by the
   ANCP sender and ignored by the ANCP receiver.

   The extension field format is also defined above in section
   Section 5.4.2.  The extension value field can contain one or more
   TLVs including the access-line identifier on the DSLAM and OAM test
   characteristics desired by the NAS.

   The TLV format is defined above in section Section 5.4.2.  The value
   field is padded to a 4-octet alignment.  The Length field in each TLV
   contains the actual number of bytes in the TLV (not including the
   padding if present).  If a TLV is not understood by the NAS, it is
   silently ignored.  Depending upon the deployment scenario, the NAS
   may specify "Access Loop Circuit-ID" or the "Access Aggregation
   Circuit-ID") as defined in section Section 5.4.1.  Following TLVs can



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   appear in this message:

   o  Type (Access-Loop-Circuit-ID = 0x01) : defined in section
      Section 5.4.1

   o  Type (Access-Aggregation-Circuit-ID-Binary = 0x06): defined in
      section Section 5.4.1

   o  Type (Access-Aggregation-Circuit-ID-ASCII = 0x03): defined in
      section Section 5.4.1

   o  Type (OAM-Loopback-Test-Parameters = 0x07): Parameters related to
      loopback test.  This is an optional TLV.  If this TLV is not
      present in the request message, the DSLAM SHOULD use locally
      determined default values for the test parameters.

         Length : (4 bytes)

         Value : two 1 byte numbers described below (listed in order of
         most to least significant).  Thus, the 4 bytes consist of 1
         byte of Count, followed by 1 byte of Timeout, followed by two
         pad bytes of zero.

         +  Count (1 byte) : Number of loopback cells/messages that
            should be generated on the local loop as part of the
            loopback test.  The NAS SHOULD restrict the "count" to be
            greater than 0 and less than or equal to 32.  The DSLAM
            SHOULD discard the request for a loopback test, if the
            received test parameters contain an out of range value for
            the "count" field.  The DSLAM MAY optionally send a failure
            response to the NAS with the code "invalid test parameter".

         +  Timeout (1 byte) : Upper bound on the time in seconds that
            the NAS would wait for a response from the DSLAM.  If the
            total time taken by the DSLAM to complete a test with
            requested parameters, exceeds the specified "timeout" value,
            it can choose to omit the generation of a response to the
            NAS.  DSLAM SHOULD use a locally determined value for the
            "timeout", if the received value of the "timeout" parameter
            is 0.

   o  Type (Opaque-Data = 0x08) : This is an optional TLV.  If present
      in the request message, the DSLAM SHOULD reflect it back in the
      response unmodified







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         Length : (8 bytes)

         Value : Two 32 bit integers inserted by the NAS (not to be
         interpreted by the DSLAM, but just reflected back in the
         response).

   The access node generates a success or failure response when it deems
   the loopback test to be complete.  "Port Management" message (type
   32) is used.  The result field SHOULD be set to success or failure.
   The function type SHOULD be set to 0x09.  The transaction ID SHOULD
   be copied from the sequence number contained in the corresponding
   request.  The other parameters not explicitly defined here SHOULD be
   set as specified in the request message above.  The code field SHOULD
   be set to a value in the range 0x500 to 0x5ff (to be reserved with
   IANA) to indicate the status of the executed test.  The valid values
   defined are (can be extended in future):

      0x500 : Specified access line does not exist

      0x501 : Loopback test timed out

      0x502 : Reserved

      0x503 : DSL line status showtime

      0x504 : DSL line status idle

      0x505 : DSL line status silent

      0x506 : DSL line status training

      0x507 : DSL line integrity error

      0x508 : DSLAM resource not available

      0x509 : Invalid test parameter

   The Extension value can contain one or more TLVs including the TLV to
   identify the access line on which the test was performed, and details
   from executing the test.  The access line identifier SHOULD be
   identical to what was contained in the request.  The relevant TLVs
   are:

   o  Type (Access-Loop-Circuit-ID = 0x01) : defined in section
      Section 5.4.1

   o  Type (Access-Aggregation-Circuit-ID-Binary = 0x06): defined in
      section Section 5.4.1



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   o  Type (Access-Aggregation-Circuit-ID-ASCII = 0x03): defined in
      section Section 5.4.1

   o  Type (Opaque-Data = 0x08) : Data inserted by the NAS in the
      request reflected back by the DSLAM.

         Length : (up to 8 bytes)

         Value : Two 32 bit integers as received in the request (opaque
         to the DSLAM).

   o  Type (OAM-Loopback-Test-Response-String = 0x09)

         Length : (up to 128 bytes)

         Value : Suitably formatted ASCII string containing useful
         details about the test that the NAS will display for the
         operator, exactly as received from the DSLAM (no manipulation/
         interpretation by the NAS).  This is an optional TLV, but it is
         strongly recommended, that in case of ATM based local loop, the
         DSLAM at the very least indicates via this TLV, the total
         loopback cells generated and the total loopback cells
         successfully received as part of executing the requested
         loopback test.

5.4.5.  Multicast Extensions

   The format of the ANCP Multicast message starts with the common GSMP
   header as in the case of the existing ANCP implementation.  Following
   is the format of this header:

        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  | Message Type  | Result|        Code           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier             |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                          Message Payload                      ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                          Figure 18: ANCP Header



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   The Result field takes one of the values defined in Section 5.

   The Transaction Identifier field is used to distinguish between
   request messages and to associate a response message to a request.
   Applications that require such response correlation MUST set the
   Transaction Identifier to a value in the range (1, 2^24 - 1).  When
   used in this manner, the Transaction Identifier sequencing MUST be
   maintained independently for each ANCP adjacency and per message
   type.  Furthermore, it SHOULD be incremented linearly for each new
   message of the given type, cycling back to 1 after running the full
   range.  Message types not requiring response message correlation
   SHOULD set the Transaction Id field to 0x0.  In the event of an ANCP
   transport protocol failure, all pending ANCP messages destined to the
   disconnected recipient can be discarded until the transport is re-
   established following which the Transaction Identifier is re-
   initialized.

   The value of the Transaction Identifier in a Response message MUST be
   set to that of the respective Request message.  This allows the
   Requester to correlate the Response to the original Request.  The
   Transaction Identifier is not used in ANCP adjacency messages.  Also,
   other ANCP applications not requiring it SHOULD set the Transaction
   Identifier to 0x0 in their messages.

   All TLVs within the ANCP message have to be 32 bit aligned, and when
   necessary padded with 0s to the 32 bit boundary.  The padding is not
   reflected in the message length field.

5.4.5.1.  General well known TLVs

   This section contains the definitions of three general well known
   TLVs.  These TLVs are intended to be re-usable across different
   Multicast messages.

5.4.5.1.1.  Target TLV

   The Target TLV (0x10) is intended to be a general well known TLV
   allowing the representation of different types of objects.  Its use
   is not restricted to any specific Message Type.


        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 = Target          |        Target-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                         Target Info                           ~
       |                                                               |



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       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Target TLV:

             TLV (0x10) indicating the type of target being addressed.
             Numbers TBC.  Tentative 0x1000 for single Access-Port.

   Target TLV Length:

             Length in bytes of Target Info.  Excludes TLV header

   Target Info:

             Target information as defined for each the given target.
             The field can consist of sub-TLVs.

   In its simplest form, when targeting a single access line the Target-
   TLV will be set to a value of (0x10), and carry in its payload one or
   more sub-TLVs identifying the target.  The following example
   illustrates the message format for a single port identified by an
   Access-Loop-Circuit-ID TLV (0x0001) that could be derived from a
   Port-UP message:

        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 = Target          |        Target-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Access-Loop-Circuit-ID=0x0001 |       Circuit-ID Length       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                    Access Loop Circuit ID                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

5.4.5.1.2.   Command TLV

   The Command TLV (0x11) is intended to be a general well known TLV
   allowing the encapsulation of one or more command directives in a TLV
   oriented message.  The semantics of the command are allowed to be
   specified for each message type, ie different message types that
   choose to carry the Command TLV are expected to define the meaning of
   the content of the payload, which could be re-used from those already
   defined elsewhere if appropriate.








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        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        |       Command-TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                         Command Info                          ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |     Additional sub-TLV Type   |   Additional sub-TLV Length   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                   Additional sub-TLV data                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Command TLV:

             TLV (0x11) indicating the contents to be one or more
             command directives.

   Command TLV Length:

             Combined length in bytes of the data in Command Info and
             sub-TLV.  Excludes the Command TLV header

   Commad-Info:

             Command information as defined for each message type.  The
             field can consist of sub-TLVs.

   Additional sub-TLV:

             Additional sub-TLVs can be present in a command TLV.  Any
             such sub-TLVs must directly follow each command.

   Additional sub-TLV Length:

             Number of actual bytes contained in the value portion of
             each additional sub-TLV

5.4.5.1.3.  Status-Info TLV

   The Status-info-TLV is intended to be a general well known TLV used
   to convey the status code regarding commands and/or requests.  The
   format of the Status-Info-TLV (0x012) is shown below.






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        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 = Status-info     |        Status TLV Length      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Result Code   |  Cmnd Nmbr    |      Error Message Length     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Error Message (aligned to 4 bytes length)              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           sub-TLVs...                                         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

   Status-info TLV:

             TLV (0x12) conveying the status or error response of a
             command

   Status TLV Length:

             Specifies the length in bytes of the Status Info TLV
             payload.  Excludes the TLV header

   Result Code:

             Conveys the result code for the command or message, as
             defined by the application.

   Cmnd Nmbr:

             Contains the command number copied from the Request
             message.  The value of 0 is used whenever the error is not
             specific to a command.

   Error Message Length:

             Contains the length of an optional error message or 0 if
             none.

   TLVs:

             This field is of indeterminate length, and contains zero or
             more of the TLVs associated with the Status-info-TLV.

5.4.5.2.  Multicast Replication Control Message

   The Multicast Replication Control Message Type 0x90 (TBC) is sent by
   the NAS to the AN with a directive to either add (join) or delete
   (leave) one or more multicast flows on a target object identified in
   the content of the message.  When a response is needed an AN MUST use



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   the Multicast Status message to convey the outcome of the directive;
   this message type is covered in Section 5.4.5.3.

   The sender of a Multicast Replication Control message MUST set the
   Result field to 0x00 meaning "Ignore".  The sender MUST populate the
   ANCP Transaction Identifier field with a distinct non-zero, linearly
   incrementing value for each Request per adjacency, as described in
   Section 5.4.5 .

   The ANCP Multicast Replication Control message payload contains the
   following TLVs:

        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 = Target TLV      |     Length of Target-Info     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                      Value = Target-Info                      ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |      Type = Command TLV       |    Length of Command Info     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       ~                      Value = Command Info                     ~
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Target:

      See Section 5.4.5.1.1.  The Target TLV (0x10) can only feature
      once in a Multicast Replication Control Message.  Only one such
      TLV is allowed in this message type.

   Length of Target-Info:

             See Section 5.4.5.1.1

   Target Info:

             See Section 5.4.5.1.1

   Command TLV:

             The Command TLV (0x11) contains the multicast flow
             directive(s) for the target and any additional parameters
             passed via sub-TLVs.  See Section 5.4.5.1.2

   Length of Command Info:



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             Includes sub-TLVs.  See Section 5.4.5.1.2

   Command Info:

             Command information as defined in section
             Section 5.4.5.1.2.

   The contents of the Command TLV for the Multicast Replication Control
   Message are defined to be as follows:

       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        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Addr Family   | Encoding Type |  Multicast Source Address     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++++++++++++|
       | Addr Family   | Encoding Type |  Multicast Flow Address       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++++++-+

   Command Code:

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

   Command Length:

             Length in bytes of each 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, 0 otherwise.
                       Not used in delete command.






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             O -



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



             M -

                       When set indicates that multicast flow is SSM and
                       the address-family-element set MUST specify the
                       source and group addresses.  When not set
                       indicates that multicast flow is ASM and address-
                       family-element MUST specify the group address,
                       and the Source Address field is to be omitted.



   Address Family:

             The address family used



   The unicast source address/mask follows the format defined in
   [IANAAEA]

   Encoded-Unicast-address: Takes 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
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Addr Family   | Encoding Type |     Unicast Address           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++++++++

   Encoded-Unicast-address: Takes 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
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Addr Family   | Encoding Type |     Unicast Address           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++++++++

   Encoding Type:






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             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.

             The address as represented by the given Address Family and
             Encoding Type.

   Address:



             The address as represented by the given Address Family and
             Encoding Type.

   The padding will be done after both addresses so that it is 32-bit
   aligned.  As an example for IPv4:

       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
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | CmdCode=0x01  |0 0 1   Flags  |         Command Length        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 0x1| Enc Type  0x0 |    Src Address first 2 bytes  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Src Address last 2 bytes      | AddrFamily 0x1|  Enc Type 0x0 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                   Multicast Address (4 bytes)                 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   In the above example, no padding is required.

   A received Multicast Replication Control Message containing an
   unrecognized Target TLV MUST be communicated to the sender as an
   error in a Multicast Status Message indicating the "Unrecognised port
   Type - 0x04" error.  The reception of a Multicast Replication Control
   Message, or any ANCP message, that is found to have mandatory TLVs
   missing is to be addressed as part of a ANCP base protocol mechanism
   yet to be defined.

   Each Multicast Replication Control Message may contain one or more
   command directives, each encapsulated by their own Command TLVs.  The
   sender MUST use separate Command TLVs for each distinct multicast
   flow.  When successive commands relate to a given Target and flow,
   the state of features controlled or affected by flags as well as by
   optional attributes received in the Multicast Replication Control
   message, are to be interpreted as replacing any such previous state
   for that port and flow.  As an example, successive Multicast
   Replication Control messages containing add commands for a given port



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   and flow, but differing in the accounting flag setting should be
   interpreted as affecting the state of the accounting feature.

   The recipient of a Multicast Replication Control message is to run an
   implicit directive numbering across the multiple directives in the
   message.  The numbering is to start from 0x01 for each directive in a
   given ANCP Multicast Replication Control message, and be restarted
   for subsequent messages.  The recipient MUST process the directives
   in the order of reception, and use the derived directive number in
   any response messages, besides the Transaction ID.

   The processing/execution of multiple directives contained in a single
   Multicast Control message MUST be interrupted at the first error, and
   the remaining commands in the Multicast Replication Control message
   discarded.  In such a case a Multicast Status message MUST be sent
   indicating the command number that resulted in the error along with
   the error code.

   When the strict sequenced processing of the directives in a single
   Multicast Control message is not required the directives MUST be
   distributed across separate Multicast Replication Control messages.

   Each command directive is equipped with an 8-bit Flags field that
   allows specification of Multicast ASM or SSM modes of operation, and
   an indication of other features or conditions attached to this
   command (e.g.  To enable accounting for the flow, etc).  Unassigned
   flags are reserved for future use, and could in the future be subject
   of the capability negotiation.  When receiving a Multicast
   Replication Control Message containing an unrecognized Flag set (to
   1), a recipient MUST interpret it as an error, and generate an
   Multicast Status message indicating the error.

   The multicast flow subject to the command is specified by means of
   one or two well known Address Family designators ([IANAAEA]), the
   IPv4-Address-Family (0x01) and the IPv6-Address-Family (0x02).  When
   the M flag is set the two Address-Family tuples MUST be present in
   the strict order specifying the multicast flow source and group
   respectively.  When the M flag is cleared only one Address-Family is
   allowed, specifying the multicast flow.

   For future extensibility, each command may also have additional TLVs
   appended following the command and multicast flow information
   (referred to as "TLVs" in the message format above).  Unrecognized
   TLVs SHOULD be silently discarded.  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":




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       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       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | 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      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | AddrFamily 01 | EncType 0x0   |  Mcast Flow: 233.252.0.3      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



5.4.5.3.  Multicast Status Message

   The Multicast Status Message (Message Type 0x91 - TBC) is sent by the
   AN to the NAS in response to a Multicast Replication Control Message
   and its command directives.  A Multicast Status message MUST use the
   same ANCP Transaction ID as that in the original Multicast
   Replication Control Message.  The Success or Failure status is
   reported in the Result field of the ANCP header as described in
   Section 5.4.5.

   A Multicast Status Message indicating Success SHOULD simply consist



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   only of the base ANCP header with no body, however the message MAY
   contain one or more TLVs that are meant to communicate any relevant
   information to an application.  The payload of a Multicast Status
   Message indicating Failure MUST contain an Status-Info TLV (0x12), as
   defined in Section 5.4.5.1.3, as its first TLV and SHOULD be followed
   by the Target TLV and Port-info.  Other TLVs MAY be present.  A
   Multicast Status message indicating Failure MUST be sent whenever a
   Multicast Control message cannot be fulfilled or results in an
   execution error.  The Cmnd Nmbr parameter in the Status-Info TLV
   contained by the Multicast Status Message is to indicate the number
   of the command in the Multicast Replication Control Message that
   resulted in an error.

        0x00 - Success

        0x01 - Malformed message

        0x02 - Command not supported

        0x03 - Flag set but not supported

        0x04 - Unrecognized Target

        0x05 - Unsupported Address Family

        0x06 - Malformed flow address

        0x07 - No resources

        0x08 - Unknown Target

        0x09 - Target down

        0x0a - Configuration error (such as Port not enabled for
        multicast)

        0x0b - Multicast flow does not exist

        0x0c - Unsupported address encoding

        0x0d - Additional info needed to execute command (payload MAY
        contain an indication of the expected info)

        0x0e - Multicast flow count exceeded







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        0x0f - M Flag set, but no IP Source address provided

        0x10 - Transaction-id out of sequence

   An example of a failure message for an invalid address, including the
   Target TLV for a 4 byte "Access Loop Circuit ID", followed by TLV
   padding, is as follows:

       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           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Partition ID  |            Transaction Identifier = 0001      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |I|      SubMessage Number      |           Length              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Status-info-TLV=0x12  |      Status-TLV-Length        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Result Code  |  Cmd Number   |    Error Message Length       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           Error Message (padded to 4) if Length > 0           |
       +---------------------------------------------------------------+
       |     Target TLV=0x10           |        Target-Length          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |     Access Loop ID type       |     Access-Loop ID  Length    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                            circuit ID                         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

5.5.  ATM-specific considerations

   The topology discovery and line configuration involve the DSL line
   attributes.  For ATM based access networks, the DSL line on the DSLAM
   is identified by the port and PVP/PVC corresponding to the
   subscriber.  The DSLAMs are connected to the NAS via an ATM access
   aggregation network.  Since, the DSLAM (access-node) is not directly
   connected to the NAS, the NAS needs a mechanism to learn the DSL line
   identifier (more generally referred to as "Access Loop Circuit-ID")
   corresponding to a subscriber.  The "Access loop circuit-ID" has no
   local significance on the NAS.  The ANCP messages for topology
   discovery and line configuration carry opaque "Access loop
   Circuit-ID" which has only local significance on the DSLAMs.

   The access loop circuit identifier can be carried as an ASCII string
   in the ANCP messages.  This allows ANCP to be decoupled from the
   specifics of the underlying access technology being controlled.  On



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   the other hand, this requires a NAS mechanism by which such
   identifier can be correlated to the context of an "aggregation
   network" facing IP interface (corresponding to the subscriber) on the
   NAS.  This would typically require local configuration of such IP
   interfaces, or of the underlying ATM interfaces.

5.6.  Ethernet-specific considerations

   One possible way of approaching the use of Ethernet technology in the
   access aggregation network is to recreate the equivalent of Virtual
   Paths (VPs) and Virtual Circuits (VCs) by using stacked Virtual LAN
   tags.  As an example, one could use an "outer" VLAN to create a form
   of "virtual path" between a given DSLAM and a given NAS.  And then
   use "inner" VLAN tags to create a form of "virtual circuit" on a per
   DSL line basis.  In this case, VLAN tags conveyed in topology
   discovery and line configuration messages will allow to uniquely
   identify the DSL line in a straightforward manner, assuming the VLAN
   tags are not translated in some way by the aggregation network, and
   are unique across physical ports.

   However, some carriers do not wish to use this "connection oriented"
   approach.  Therefore, an alternative model is to bridge sessions from
   multiple subscribers behind a DSLAM to a single VLAN in the
   aggregation network.  This is the N:1 model.  In this model, or in
   the case where user traffic is sent untagged, the access node needs
   to insert the exact identity of the DSL line in the topology
   discovery and line configuration messages, and then hve a mechanism
   by which this can be correlated to the context of an "aggregation
   network" facing IP interface (for the subscriber) on the NAS.  This
   can either be based on local configuration on the NAS, or on the fact
   that such DSLAM (access node) typically inserts the "Access Loop
   Circuit ID" in subscriber signaling messages relayed to the NAS (i.e.
   DHCP or PPPoE discovery messages).

   Section Section 5.4.1 defines "Access Loop Circuit ID".


6.  IANA Considerations

   This document defines the following additions to the GSMPv3 Message
   Type Name Space registry:

        +-------------------------------+--------+---------------+
        | Message                       | Number | Reference     |
        +-------------------------------+--------+---------------+
        | Multicast Replication Control | 90     | This document |
        | Multicast Status              | 91     | This document |
        +-------------------------------+--------+---------------+



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   This document defines the following modification to the Global Switch
   Management Protocol version 3 (GSMPv3) Result Type Name Space
   registry:

         +--------------+------------------------+---------------+
         | Result Value | Result Type Name       | Reference     |
         +--------------+------------------------+---------------+
         | 0            | Ignore (from Reserved) | This document |
         +--------------+------------------------+---------------+

   This document defines the following addition to the GSMPv3 Message
   Function Name Space registry [editor's note GMSPv3 did not define a
   Name Space for Function even if RFC3292 defines values for function
   field]:

           +----------------+-----------------+---------------+
           | Function Value | Function Name   | Reference     |
           +----------------+-----------------+---------------+
           | 0x09           | Remote loopback | This document |
           +----------------+-----------------+---------------+

   This document reserves the range 0x500 to 0x5ff of GSMPv3 Failure
   Response Message Name Space registry to indicate the status of the
   executed test for OAM use case described in Section 5.4.4.  The
   initial entries are as follows:

   +-------------------------+----------------------------+------------+
   | Failure Response        | Failure Response Message   | Reference  |
   | Message Value           | Name                       |            |
   +-------------------------+----------------------------+------------+
   | 0x500                   | Specified access line does | This       |
   |                         | not exist                  | document   |
   | 0x501                   | Loopback test timed out    | This       |
   |                         |                            | document   |
   | 0x502                   | Reserved                   | This       |
   |                         |                            | document   |
   | 0x503                   | DSL line status showtime   | This       |
   |                         |                            | document   |
   | 0x0504                  | DSL line status idle       | This       |
   |                         |                            | document   |
   | 0x0505                  | DSL line status silent     | This       |
   |                         |                            | document   |
   | 0x0506                  | DSL line status training   | This       |
   |                         |                            | document   |
   | 0x507                   | DSL line integrity error   | This       |
   |                         |                            | document   |
   | 0x0508                  | DSLAM resource not         | This       |
   |                         | available                  | document   |



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   | 0x509                   | Invalid test parameter     | This       |
   |                         |                            | document   |
   +-------------------------+----------------------------+------------+

   This document defines a new ANCP Tech Type Name Space registry.  The
   initial entries are as follows:

   +----------------+-----------------------------------+--------------+
   | Tech Type      | Tech Type Name                    | Reference    |
   | Value          |                                   |              |
   +----------------+-----------------------------------+--------------+
   | 0x00           | Extension block not in use        | This         |
   |                |                                   | document     |
   | 0x01 - 0x04    | Already in use by various         | This         |
   |                | technologies                      | document     |
   | 0x05           | DSL                               | This         |
   |                |                                   | document     |
   | 0x06 - 0xFE    | Reserved                          | This         |
   |                |                                   | document     |
   | 0xFF           | Base Specification Use            | This         |
   |                |                                   | document     |
   +----------------+-----------------------------------+--------------+

   This document defines a new ANCP Status-Info Result Code registry.
   The initial entries are as follows:

   +-----------------------------------------------+-------+-----------+
   | Result Code                                   | Value | Reference |
   +-----------------------------------------------+-------+-----------+
   | Success                                       | 0x00  | This      |
   |                                               |       | document  |
   | Malformed message                             | 0x01  | This      |
   |                                               |       | document  |
   | Command not supported                         | 0x02  | This      |
   |                                               |       | document  |
   | Flag set but not supported                    | 0x03  | This      |
   |                                               |       | document  |
   | Unrecognized Target                           | 0x04  | This      |
   |                                               |       | document  |
   | Unsupported Address Family                    | 0x05  | This      |
   |                                               |       | document  |
   | Malformed flow address                        | 0x06  | This      |
   |                                               |       | document  |
   | No resources                                  | 0x07  | This      |
   |                                               |       | document  |
   | Unknown Target                                | 0x08  | This      |
   |                                               |       | document  |




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   | Target down                                   | 0x09  | This      |
   |                                               |       | document  |
   | Configuration error (such as Port not enabled | 0x0a  | This      |
   | 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 provided | 0x0f  | This      |
   |                                               |       | document  |
   | Transaction-id out of sequence                | 0x010 | This      |
   |                                               |       | document  |
   +-----------------------------------------------+-------+-----------+

   This document defines a new ANCP Command Code registry.  The initial
   entries are as follows:

   +-----------------------------+--------------------+---------------+
   | Command Code Directive Name | Command Code Value | Reference     |
   +-----------------------------+--------------------+---------------+
   | Reserved                    | 0x00               | This document |
   | Add                         | 0x01               | This document |
   | Delete                      | 0x02               | This document |
   | Delete All                  | 0x03               | This document |
   +-----------------------------+--------------------+---------------+

   This document defines a new ANCP TLV Type registry.  The initial
   entries are as follows:


















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   +--------------------------------------+-----------+---------------+
   | TLV Name                             | Type Code | Reference     |
   +--------------------------------------+-----------+---------------+
   | Access-Loop-Circuit-ID               | 0x01      | This document |
   | Access-Loop-Remote-Id                | 0x02      | This document |
   | Access-Aggregation-Circuit-ID-ASCII  | 0x03      | This document |
   | DSL Line Attributes                  | 0x04      | This document |
   | Service-Profile-Name                 | 0x05      | This document |
   | Access-Aggregation-Circuit-ID-Binary | 0x06      | This document |
   | OAM-Loopback-Test-Parameters         | 0x07      | This document |
   | Opaque-Data                          | 0x08      | This document |
   | OAM-Loopback-Test-Response-String    | 0x09      | This document |
   | Reserved                             | 0x0a-0x0f | This document |
   | Target                               | 0x10      | This document |
   | Command                              | 0x11      | This document |
   | Status-Info                          | 0x012     | This document |
   +--------------------------------------+-----------+---------------+

   This document defines a new ANCP Capability registry.  The initial
   entries are as follows:

   +----------------------------+----------------------+---------------+
   | Capability Type Name       | Capability Type Code | Reference     |
   +----------------------------+----------------------+---------------+
   | Dynamic-Topology-Discovery | 0x01                 | This document |
   | Line-Configuration         | 0x02                 | This document |
   | Transactional-Multicast    | 0x03                 | This document |
   | OAM                        | 0x04                 | This document |
   +----------------------------+----------------------+---------------+

   This document defines a new ANCP sub-TLV Type registry.  The initial
   entries are as follows:



















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   +--------------------------------------------+--------+-------------+
   | sub-TLV Name                               | Type   | Reference   |
   |                                            | Code   |             |
   +--------------------------------------------+--------+-------------+
   | Actual-Net-Data-Upstream                   | 0x81   | This        |
   |                                            |        | document    |
   | Actual-Net-Data-Rate-Downstream            | 0x82   | This        |
   |                                            |        | document    |
   | Minimum-Net-Data-Rate-Upstream             | 0x83   | This        |
   |                                            |        | document    |
   | Minimum-Net-Data-Rate-Downstream           | 0x84   | This        |
   |                                            |        | document    |
   | Attainable-Net-Data-Rate-Upstream          | 0x85   | This        |
   |                                            |        | document    |
   | Attainable-Net-Data-Rate-Downstream        | 0x86   | This        |
   |                                            |        | document    |
   | Maximum-Net-Data-Rate-Upstream             | 0x87   | This        |
   |                                            |        | document    |
   | Maximum-Net-Data-Rate-Downstream           | 0x88   | This        |
   |                                            |        | document    |
   | Minimum-Net-Low-Power-Data-Rate-Upstream   | 0x89   | This        |
   |                                            |        | document    |
   | Minimum-Net-Low-Power-Data-Rate-Downstream | 0x8A   | This        |
   |                                            |        | document    |
   | Maximum-Interleaving-Delay-Upstream        | 0x8B   | This        |
   |                                            |        | document    |
   | Actual-Interleaving-Delay-Upstream         | 0x8C   | This        |
   |                                            |        | document    |
   | Maximum-Interleaving-Delay-Downstream      | 0x8D   | This        |
   |                                            |        | document    |
   | Actual-Interleaving-Delay-Downstream       | 0x8E   | This        |
   |                                            |        | document    |
   | DSL line state                             | 0x8F   | This        |
   |                                            |        | document    |
   | Access Loop Encapsulation                  | 0x90   | This        |
   |                                            |        | document    |
   | DSL-Type                                   | 0x91   | This        |
   |                                            |        | document    |
   +--------------------------------------------+--------+-------------+


7.  Security Considerations

   Security of the ANCP protocol is discussed in [ANCP-SEC]







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8.  Acknowledgements

   The authors would like to thank everyone that has provided comments
   or inputs to this document.  In particular, the authors acknowledge
   the inputs provided by Peter Arberg, Josef Froehler, Derek Harkness,
   Kim Hyldgaard, Sandy Ng, Robert Peschi, Michel Platnic, Tom Taylor
   and the work done by Philippe Champagne, Wojciech Dec and Stefaan De
   Cnodder regarding multicast extensions.


9.  References

9.1.  Normative References

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

   [RFC3046]  Patrick, M., "DHCP Relay Agent Information Option",
              January 2001.

   [RFC3292]  Doria, A. and et all, "General Switch Management Protocol
              (GSMP) V3", June 2002.

   [RFC3293]  Worster, T., Doria, A., and and J. Buerkle, "General
              Switch Management Protocol (GSMP) Packet Encapsulations
              for Asynchronous Transfer Mode (ATM), Ethernet and
              Transmission Control Protocol (TCP)", June 2002.

9.2.  Informative References

   [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-08.txt, , February 2009.

   [ANCP-SEC]
              Moustafa, H., Tschofenig, T., and S. De Cnodder, "Security
              Threats and Security Requirements for the Access Node
              Control Protocol (ANCP)",
              draft-ietf-ancp-security-threats-07.txt work in progress,
              March 2009.

   [G.988.1]  "ITU-T recommendation G.998.1, ATM-based multi-pair
              bonding", 2005.

   [G.988.2]  "ITU-T recommendation G.998.2, Ethernet-based multi-pair
              bonding,", 2005.



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

   [TR-058]   Elias, M. and S. Ooghe, "DSL Forum TR-058, Multi-Service
              Architecture & Framework Requirements", September 2003.

   [TR-059]   Anschutz, T., "DSL Forum TR-059, DSL Evolution -
              Architecture Requirements for the Support of QoS-Enabled
              IP Services", September 2003.

   [TR-092]   "DSL Forum TR-092, Broadband Remote access server
              requirements document", 2005.

   [TR-101]   Cohen et al, "Architecture & Transport: "Migration to
              Ethernet Based DSL Aggregation", DSL Forum TR-101", 2005.


Authors' Addresses

   Sanjay Wadhwa
   Juniper Networks
   10 Technology Park Drive
   Westford, MA  01886
   USA

   Phone:
   Fax:
   Email: swadhwa@juniper.net


   Jerome Moisand
   Juniper Networks
   10 Technology Park Drive
   Westford, MA  01886
   USA

   Phone:
   Fax:
   Email: jmoisand@juniper.net












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   Swami Subramanian
   Juniper Networks
   10 Technology Park Drive
   Westford, MA  01886
   USA

   Phone:
   Fax:
   Email: ssubramanian@juniper.net


   Thomas Haag
   T-systems


   Phone:
   Fax:
   Email: thomas.haag@t-systems.com


   Norber Voigt
   Siemens


   Phone:
   Fax:
   Email: norbert.voigt@siemens.com


   Roberta Maglione
   Telecom Italia
   via Reiss Romoli 274
   Torino
   Italy

   Phone:
   Email: roberta.maglione@telecomitalia.it














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