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Versions: (draft-palle-pce-stateful-pce-initiated-p2mp-lsp) 00 01 02 03 04 05 06 07 08 09 draft-ietf-pce-stateful-pce-p2mp

PCE Working Group                                               U. Palle
Internet-Draft                                                  D. Dhody
Intended status: Standards Track                     Huawei Technologies
Expires: July 13, 2016                                         Y. Tanaka
                                                      NTT Communications
                                                                  Z. Ali
                                                           Cisco Systems
                                                               V. Beeram
                                                        Juniper Networks
                                                        January 10, 2016


  Path Computation Element (PCE) Protocol Extensions for Stateful PCE
 usage for Point-to-Multipoint Traffic Engineering Label Switched Paths
                  draft-palle-pce-stateful-pce-p2mp-08

Abstract

   The Path Computation Element (PCE) has been identified as an
   appropriate technology for the determination of the paths of point-
   to-multipoint (P2MP) TE LSPs.  This document provides extensions
   required for Path Computation Element communication Protocol (PCEP)
   so as to enable the usage of a stateful PCE capability in supporting
   P2MP TE LSPs.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

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

   This Internet-Draft will expire on July 13, 2016.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.





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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Supporting P2MP TE LSP for Stateful PCE . . . . . . . . . . .   4
     3.1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Objectives  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Functions to Support P2MP TE LSPs for Stateful PCEs . . . . .   4
   5.  Architectural Overview of Protocol Extensions . . . . . . . .   5
     5.1.  Extension of PCEP Messages  . . . . . . . . . . . . . . .   5
     5.2.  Capability Advertisement  . . . . . . . . . . . . . . . .   6
     5.3.  IGP Extensions for Stateful PCE P2MP Capabilities
           Advertisement . . . . . . . . . . . . . . . . . . . . . .   6
     5.4.  State Synchronization . . . . . . . . . . . . . . . . . .   7
     5.5.  LSP Delegation  . . . . . . . . . . . . . . . . . . . . .   7
     5.6.  LSP Operations  . . . . . . . . . . . . . . . . . . . . .   7
       5.6.1.  Passive Stateful PCE  . . . . . . . . . . . . . . . .   7
       5.6.2.  Active Stateful PCE . . . . . . . . . . . . . . . . .   8
   6.  PCEP Object Extensions  . . . . . . . . . . . . . . . . . . .   8
     6.1.  Extension of LSP Object . . . . . . . . . . . . . . . . .   8
     6.2.  P2MP-LSP-IDENTIFIER TLV . . . . . . . . . . . . . . . . .   8
     6.3.  S2LS Object . . . . . . . . . . . . . . . . . . . . . . .  11
   7.  PCEP Message Extensions . . . . . . . . . . . . . . . . . . .  12
     7.1.  The PCRpt Message . . . . . . . . . . . . . . . . . . . .  12
     7.2.  The PCUpd Message . . . . . . . . . . . . . . . . . . . .  13
     7.3.  The PCReq Message . . . . . . . . . . . . . . . . . . . .  14
     7.4.  The PCRep Message . . . . . . . . . . . . . . . . . . . .  15
     7.5.  Example . . . . . . . . . . . . . . . . . . . . . . . . .  16
       7.5.1.  P2MP TE LSP Update Request  . . . . . . . . . . . . .  16
       7.5.2.  P2MP TE LSP Report  . . . . . . . . . . . . . . . . .  16
     7.6.  Report and Update Message Fragmentation . . . . . . . . .  17
       7.6.1.  Report Fragmentation Procedure  . . . . . . . . . . .  18
       7.6.2.  Update Fragmentation Procedure  . . . . . . . . . . .  18
   8.  Non-Support of P2MP TE LSPs for Stateful PCE  . . . . . . . .  18
   9.  Manageability Considerations  . . . . . . . . . . . . . . . .  19
     9.1.  Control of Function and Policy  . . . . . . . . . . . . .  19
     9.2.  Information and Data Models . . . . . . . . . . . . . . .  19



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     9.3.  Liveness Detection and Monitoring . . . . . . . . . . . .  19
     9.4.  Verify Correct Operations . . . . . . . . . . . . . . . .  19
     9.5.  Requirements On Other Protocols . . . . . . . . . . . . .  20
     9.6.  Impact On Network Operations  . . . . . . . . . . . . . .  20
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
     10.1.  PCE Capabilities in IGP Advertisements . . . . . . . . .  20
     10.2.  STATEFUL-PCE-CAPABILITY TLV  . . . . . . . . . . . . . .  20
     10.3.  Extension of LSP Object  . . . . . . . . . . . . . . . .  21
     10.4.  Extension of PCEP-Error Object . . . . . . . . . . . . .  21
     10.5.  PCEP TLV Type Indicators . . . . . . . . . . . . . . . .  22
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  22
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  23
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  23
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  23
     13.2.  Informative References . . . . . . . . . . . . . . . . .  24
   Appendix A.  Contributor Addresses  . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  26

1.  Introduction

   As per [RFC4655], the Path Computation Element (PCE) is an entity
   that is capable of computing a network path or route based on a
   network graph, and applying computational constraints.  A Path
   Computation Client (PCC) may make requests to a PCE for paths to be
   computed.

   [RFC4857] describes how to set up point-to-multipoint (P2MP) Traffic
   Engineering Label Switched Paths (TE LSPs) for use in Multiprotocol
   Label Switching (MPLS) and Generalized MPLS (GMPLS) networks.  The
   PCE has been identified as a suitable application for the computation
   of paths for P2MP TE LSPs ([RFC5671]).

   The PCEP is designed as a communication protocol between PCCs and
   PCEs for point-to-point (P2P) path computations and is defined in
   [RFC5440].  The extensions of PCEP to request path computation for
   P2MP TE LSPs are described in [RFC6006].

   Stateful PCEs are shown to be helpful in many application scenarios,
   in both MPLS and GMPLS networks, as illustrated in
   [I-D.ietf-pce-stateful-pce-app].  These scenarios apply equally to
   P2P and P2MP TE LSPs.  [I-D.ietf-pce-stateful-pce] provides the
   fundamental extensions needed for stateful PCE to support general
   functionality for P2P TE LSP.  Complementarily, this document focuses
   on the extensions that are necessary in order for the deployment of
   stateful PCEs to support P2MP TE LSPs.






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1.1.  Requirements Language

   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.  Terminology

   Terminology used in this document is same as terminology used in
   [I-D.ietf-pce-stateful-pce] and [RFC6006].

3.  Supporting P2MP TE LSP for Stateful PCE

3.1.  Motivation

   [I-D.ietf-pce-stateful-pce-app] presents several use cases,
   demonstrating scenarios that benefit from the deployment of a
   stateful PCE including optimization, recovery, etc which are equally
   applicable to P2MP TE LSPs.  [I-D.ietf-pce-stateful-pce] defines the
   extensions to PCEP for P2P TE LSPs.  Complementarily, this document
   focuses on the extensions that are necessary in order for the
   deployment of stateful PCEs to support P2MP TE LSPs.

   In addition to that, the stateful nature of a PCE simplifies the
   information conveyed in PCEP messages since it is possible to refer
   to the LSPs via PLSP-ID ([I-D.ietf-pce-stateful-pce]).  For P2MP this
   is an added advantage, where the size of message is much larger.
   Incase of stateless PCE, a modification of P2MP tree requires
   encoding of all leaves along with the paths in PCReq message, but
   using a stateful PCE with P2MP capability, the PCEP message can be
   used to convey only the modifications (the other information can be
   retrieved from the P2MP LSP identifier in the LSP database (LSPDB)).

3.2.  Objectives

   The objectives for the protocol extensions to support P2MP TE LSP for
   stateful PCE are same as the objectives described in section 3.2 of
   [I-D.ietf-pce-stateful-pce].

4.  Functions to Support P2MP TE LSPs for Stateful PCEs

   [I-D.ietf-pce-stateful-pce] specifies new functions to support a
   stateful PCE.  It also specifies that a function can be initiated
   either from a PCC towards a PCE (C-E) or from a PCE towards a PCC
   (E-C).

   This document extends these functions to support P2MP TE LSPs.




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   Capability Advertisement (E-C,C-E):  both the PCC and the PCE must
      announce during PCEP session establishment that they support PCEP
      Stateful PCE extensions for P2MP using mechanisms defined in
      Section 5.2.

   LSP State Synchronization (C-E):  after the session between the PCC
      and a stateful PCE with P2MP capability is initialized, the PCE
      must learn the state of a PCC's P2MP TE LSPs before it can perform
      path computations or update LSP attributes in a PCC.

   LSP Update Request (E-C):  a stateful PCE with P2MP capability
      requests modification of attributes on a PCC's P2MP TE LSP.

   LSP State Report (C-E):  a PCC sends an LSP state report to a PCE
      whenever the state of a P2MP TE LSP changes.

   LSP Control Delegation (C-E,E-C):  a PCC grants to a PCE the right to
      update LSP attributes on one or more P2MP TE LSPs; the PCE becomes
      the authoritative source of the LSP's attributes as long as the
      delegation is in effect (See Section 5.7 of
      [I-D.ietf-pce-stateful-pce]); the PCC may withdraw the delegation
      or the PCE may give up the delegation at any time.

5.  Architectural Overview of Protocol Extensions

5.1.  Extension of PCEP Messages

   New PCEP messages are defined in [I-D.ietf-pce-stateful-pce] to
   support stateful PCE for P2P TE LSPs.  In this document these
   messages are extended to support P2MP TE LSPs.

   Path Computation State Report (PCRpt):  Each P2MP TE LSP State Report
      in a PCRpt message can contain actual P2MP TE LSP path attributes,
      LSP status, etc.  An LSP State Report carried on a PCRpt message
      is also used in delegation or revocation of control of a P2MP TE
      LSP to/from a PCE.  The extension of PCRpt message is described in
      Section 7.1.

   Path Computation Update Request (PCUpd):  Each P2MP TE LSP Update
      Request in a PCUpd message MUST contain all LSP parameters that a
      PCE wishes to set for a given P2MP TE LSP.  An LSP Update Request
      carried on a PCUpd message is also used to return LSP delegations
      if at any point PCE no longer desires control of a P2MP TE LSP.
      The PCUpd message is described in Section 7.2.







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5.2.  Capability Advertisement

   During PCEP Initialization Phase, as per Section 7.1.1 of
   [I-D.ietf-pce-stateful-pce], PCEP speakers advertises Stateful
   capability via Stateful PCE Capability TLV in open message.  Two new
   flags are defined for the STATEFUL-PCE-CAPABILITY TLV defined in
   [I-D.ietf-pce-stateful-pce] and updated in
   [I-D.ietf-pce-pce-initiated-lsp] and
   [I-D.ietf-pce-stateful-sync-optimizations].

   Two new bits N (P2MP-CAPABILITY) and M (P2MP-LSP-UPDATE-CAPABILITY)
   are added in this document:

   N (P2MP-CAPABILITY - 1 bit):  if set to 1 by a PCC, the N Flag
      indicates that the PCC is willing to send P2MP LSP State Reports
      whenever P2MP LSP parameters or operational status changes.; if
      set to 1 by a PCE, the N Flag indicates that the PCE is interested
      in receiving LSP State Reports whenever LSP parameters or
      operational status changes.  The P2MP-CAPABILITY Flag must be
      advertised by both a PCC and a PCE for PCRpt messages P2MP
      extension to be allowed on a PCEP session.

   M (P2MP-LSP-UPDATE-CAPABILITY - 1 bit):  if set to 1 by a PCC, the M
      Flag indicates that the PCC allows modification of P2MP LSP
      parameters; if set to 1 by a PCE, the M Flag indicates that the
      PCE is capable of updating P2MP LSP parameters.  The P2MP-LSP-
      UPDATE-CAPABILITY Flag must be advertised by both a PCC and a PCE
      for PCUpd messages P2MP extension to be allowed on a PCEP session.

   A PCEP speaker should continue to advertise the basic P2MP capability
   via mechanisms as described in [RFC6006].

5.3.  IGP Extensions for Stateful PCE P2MP Capabilities Advertisement

   When PCCs are LSRs participating in the IGP (OSPF or IS-IS), and PCEs
   are either LSRs or servers also participating in the IGP, an
   effective mechanism for PCE discovery within an IGP routing domain
   consists of utilizing IGP advertisements.  Extensions for the
   advertisement of PCE Discovery Information are defined for OSPF and
   for IS-IS in [RFC5088] and [RFC5089] respectively.

   The PCE-CAP-FLAGS sub-TLV, defined in [RFC5089], is an optional sub-
   TLV used to advertise PCE capabilities.  It MAY be present within the
   PCED sub-TLV carried by OSPF or IS-IS.  [RFC5088] and [RFC5089]
   provide the description and processing rules for this sub-TLV when
   carried within OSPF and IS-IS, respectively.





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   The format of the PCE-CAP-FLAGS sub-TLV is included below for easy
   reference:

   Type: 5

   Length: Multiple of 4.

   Value: This contains an array of units of 32 bit flags with the most
   significant bit as 0.  Each bit represents one PCE capability.

   PCE capability bits are defined in [RFC5088].  This document defines
   new capability bits for the stateful PCE with P2MP as follows:

               Bit                  Capability
               TBD                  Active Stateful PCE with P2MP
               TBD                  Passive Stateful PCE with P2MP

   Note that while active and passive stateful PCE with P2MP
   capabilities may be advertised during discovery, PCEP Speakers that
   wish to use stateful PCEP MUST negotiate stateful PCEP capabilities
   during PCEP session setup, as specified in the current document.  A
   PCC MAY initiate stateful PCEP capability negotiation at PCEP session
   setup even if it did not receive any IGP PCE capability
   advertisements.

5.4.  State Synchronization

   State Synchronization operations described in Section 5.6 of
   [I-D.ietf-pce-stateful-pce] are applicable for P2MP TE LSPs as well.

5.5.  LSP Delegation

   LSP delegation operations described in Section 5.7 of
   [I-D.ietf-pce-stateful-pce] are applicable for P2MP TE LSPs as well.

5.6.  LSP Operations

5.6.1.  Passive Stateful PCE

   LSP operations for passive stateful PCE described in Section 5.8.1 of
   [I-D.ietf-pce-stateful-pce] are applicable for P2MP TE LSPs as well.

   The Path Computation Request and Response message format for P2MP TE
   LSPs is described in Section 3.4 and Section 3.5 of [RFC6006]
   respectively.

   The Request and Response message for P2MP TE LSPs are extended to
   support encoding of LSP object, so that it is possible to refer to a



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   LSP with a unique identifier and simplify the PCEP message exchange.
   For example, incase of modification of one leaf in a P2MP tree, there
   should be no need to carry the full P2MP tree in PCReq message.

   The extension for the Request and Response message for passive
   stateful operations on P2MP TE LSPs are described in Section 7.3 and
   Section 7.4.  The extension for the Path Computation LSP State Report
   (PCRpt) message is described in Section 7.1.

5.6.2.  Active Stateful PCE

   LSP operations for active stateful PCE described in Section 5.8.2 of
   [I-D.ietf-pce-stateful-pce] are applicable for P2MP TE LSPs as well.

   The extension for the Path Computation LSP Update (PCUpd) message for
   active stateful operations on P2MP TE LSPs are described in
   Section 7.2.

6.  PCEP Object Extensions

   The PCEP TLV defined in this document is compliant with the PCEP TLV
   format defined in [RFC5440].

6.1.  Extension of LSP Object

   LSP Object is defined in Section 7.3 of [I-D.ietf-pce-stateful-pce].
   It specifies PLSP-ID to uniquely identify an LSP that is constant for
   the life time of a PCEP session.  Similarly for P2MP tunnel, PLSP-ID
   identify a P2MP TE LSP uniquely.  This document adds the following
   flags to the LSP Object:

   N (P2MP bit):  If the bit is set to 1, it specifies the message is
      for P2MP TE LSP which MUST be set in PCRpt or PCUpd message for a
      P2MP TE LSP.

   F (Fragmentation bit):  If the bit is set to 1, it specifies the
      message is fragmented.

   If P2MP bit is set, the following P2MP-LSP-IDENTIFIER TLV MUST be
   present in LSP object.

6.2.  P2MP-LSP-IDENTIFIER TLV

   The P2MP LSP Identifier TLV MUST be included in the LSP object in
   PCRpt message for RSVP-TE signaled P2MP TE LSPs.  If the TLV is
   missing, the PCE will generate an error with error-type 6 (mandatory
   object missing) and error-value TBD (P2MP-LSP-IDENTIFIERS TLV
   missing) and close the PCEP session.



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   The P2MP LSP Identifier TLV MAY be included in the LSP object in
   PCUpd message for RSVP-TE signaled P2MP TE LSPs.  The special value
   of all zeros for this TLV is used to refer to all paths pertaining to
   a particular PLSP-ID.

   There are two P2MP LSP Identifier TLVs, one for IPv4 and one for
   IPv6.

   The format of the IPV4-P2MP-LSP-IDENTIFIER TLV is shown in the
   following figure:

    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=[TBD]          |           Length=16           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                   IPv4 Tunnel Sender Address                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             LSP ID            |           Tunnel ID           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        Extended Tunnel ID                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             P2MP ID                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



               Figure 1: IPV4-P2MP-LSP-IDENTIFIER TLV format

   The type (16-bit) of the TLV is [TBD] to be assigned by IANA.  The
   length (16-bit) has a fixed value of 16 octets.  The value contains
   the following fields:

   IPv4 Tunnel Sender Address:  contains the sender node's IPv4 address,
      as defined in [RFC3209], Section 4.6.2.1 for the LSP_TUNNEL_IPv4
      Sender Template Object.

   LSP ID:  contains the 16-bit 'LSP ID' identifier defined in
      [RFC3209], Section 4.6.2.1 for the LSP_TUNNEL_IPv4 Sender Template
      Object.

   Tunnel ID:  contains the 16-bit 'Tunnel ID' identifier defined in
      [RFC3209], Section 4.6.1.1 for the LSP_TUNNEL_IPv4 Session Object.

   Extended Tunnel ID:  contains the 32-bit 'Extended Tunnel ID'
      identifier defined in [RFC3209], Section 4.6.1.1 for the
      LSP_TUNNEL_IPv4 Session Object.




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   P2MP ID:  contains the 32-bit 'P2MP ID' identifier defined in
      Section 19.1.1 of [RFC4875]for the P2MP LSP Tunnel IPv4 SESSION
      Object.

   The format of the IPV6-P2MP-LSP-IDENTIFIER TLV is shown in the
   following figure:


    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=[TBD]          |           Length=40           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   +                                                               +
   |                  IPv6 tunnel sender address                   |
   +                          (16 octets)                          +
   |                                                               |
   +                                                               +
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             LSP ID            |           Tunnel ID           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   +                                                               +
   |                       Extended Tunnel ID                      |
   +                          (16 octets)                          +
   |                                                               |
   +                                                               +
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             P2MP ID                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


               Figure 2: IPV6-P2MP-LSP-IDENTIFIER TLV format

   The type of the TLV is [TBD] to be assigned by IANA.  The length
   (16-bit) has a fixed length of 40 octets.  The value contains the
   following fields:

   IPv6 Tunnel Sender Address:  contains the sender node's IPv6 address,
      as defined in [RFC3209], Section 4.6.2.2 for the LSP_TUNNEL_IPv6
      Sender Template Object.

   LSP ID:  contains the 16-bit 'LSP ID' identifier defined in
      [RFC3209], Section 4.6.2.2 for the LSP_TUNNEL_IPv6 Sender Template
      Object.



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   Tunnel ID:  contains the 16-bit 'Tunnel ID' identifier defined in
      [RFC3209], Section 4.6.1.2 for the LSP_TUNNEL_IPv6 Session Object.

   Extended Tunnel ID:  contains the 128-bit 'Extended Tunnel ID'
      identifier defined in [RFC3209], Section 4.6.1.2 for the
      LSP_TUNNEL_IPv6 Session Object.

   P2MP ID:  As defined above in IPV4-P2MP-LSP-IDENTIFIERS TLV.

   Tunnel ID remains constant over the life time of a tunnel.

6.3.  S2LS Object

   The S2LS (Source-to-Leaves) Object is used to report RSVP-TE state of
   one or more destiantions (leaves) encoded within the END-POINTS
   object for a P2MP TE LSP.  It MUST be carried in PCRpt message along
   with END-POINTS object when N bit is set in LSP object.

   S2LS Object-Class is [TBD].

   S2LS Object-Types is 1.

   The format of the S2LS object is shown in the following figure:


    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             Flags                       |    O|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   //                      Optional TLVs                          //
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                       Figure 3: S2LS object format

   Flags(32 bits):

   O(Operational - 3 bits)  the O Field represents the operational
      status of the group of destinations.  The values are as per
      Operational field in LSP object defined in Section 7.3 of
      [I-D.ietf-pce-stateful-pce].

   When N bit is set in LSP object then the O field in LSP object
   represents the operational status of the full P2MP TE LSP and the O




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   field in S2LS object represents the operational status of a group of
   destinations encoded within the END-POINTS object.

   Future documents MAY define optional TLVs that MAY be included in the
   S2LS Object.

7.  PCEP Message Extensions

7.1.  The PCRpt Message

   As per Section 6.1 of [I-D.ietf-pce-stateful-pce], PCRpt message is
   used to report the current state of a P2P TE LSP.  This document
   extends the PCRpt message in reporting the status of P2MP TE LSP.

   The format of PCRpt message is as follows:


   <PCRpt Message> ::= <Common Header>
                     <state-report-list>
   Where:

   <state-report-list> ::= <state-report>
                         [<state-report-list>]

   <state-report> ::= [<SRP>]
                       <LSP>
                       <end-point-path-pair-list>
                       <attribute-list>
   Where:

   <end-point-path-pair-list>::=
                      [<END-POINTS>]
                      [<S2LS>]
                      <intended_path>
                      [<actual_path>]
                      [<end-point-path-pair-list>]

   <intended_path> ::= (<ERO>|<SERO>)
              [<intended_path>]

   <actual_path> ::= (<RRO>|<SRRO>)
              [<actual_path>]

   <attribute-list> is defined in [RFC5440] and
   extended by PCEP extensions.






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   The P2MP END-POINTS object defined in [RFC6006]is mandatory for
   specifying address of P2MP leaves grouped based on leaf types.

   o  New leaves to add (leaf type = 1)

   o  Old leaves to remove (leaf type = 2)

   o  Old leaves whose path can be modified/reoptimized (leaf type = 3)

   o  Old leaves whose path must be left unchanged (leaf type = 4)

   When reporting the status of a P2MP TE LSP, the destinations are
   grouped in END-POINTS object based on the operational status (O field
   in S2LS object) and leaf type (in END-POINTS).  This way the leaves
   that share the same operational status are grouped together.  For
   reporing the status of delegated P2MP TE LSP, leaf-type = 3, where as
   for non-delegated P2MP TE LSP, leaf-type = 4 is used.

   For delegated P2MP TE LSP configuration changes are reported via
   PCRpt message.  For example, adding of new leaves END-POINTS (leaf-
   type = 1) is used where as removing of old leaves (leaf-type = 2) is
   used.

   Note that we preserve compatibility with the
   [I-D.ietf-pce-stateful-pce] definition of <state-report>.  At least
   one instance of <END-POINTS> MUST be present in this message for P2MP
   LSP.

   During state synchronization, the PCRpt message must report the
   status of the full P2MP TE LSP.

   The S2LS object MUST be carried in PCRpt message along with END-
   POINTS object when N bit is set in LSP object for P2MP TE LSP.  If
   the S2LS object is missing, the receiving PCE MUST send a PCErr
   message with Error-type=6 (Mandatory Object missing) and Error-
   value=TBD (S2LS object missing).  If the END-POINTS object is
   missing, the receiving PCE MUST send a PCErr message with Error-
   type=6 (Mandatory Object missing) and Error-value=3 (END-POINTS
   object missing) (defined in [RFC5440].

7.2.  The PCUpd Message

   As per Section 6.2 of [I-D.ietf-pce-stateful-pce], PCUpd message is
   used to update P2P TE LSP attributes.  This document extends the
   PCUpd message in updating the attributes of P2MP TE LSP.

   The format of a PCUpd message is as follows:




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      <PCUpd Message> ::= <Common Header>
                          <update-request-list>

      Where:

      <update-request-list> ::= <update-request>
                                [<update-request-list>]

      <update-request> ::= <SRP>
                           <LSP>
                           <end-point-path-pair-list>

   <attribute-list>
      Where:

      <end-point-path-pair-list>::=
                      [<END-POINTS>]
                      <path>
                      [<end-point-path-pair-list>]

      <path> ::= (<ERO>|<SERO>)
                 [<path>]

      <attribute-list> is defined in [RFC5440] and
      extended by PCEP extensions.


   Note that we preserve compatibility with the
   [I-D.ietf-pce-stateful-pce] definition of <update-request>.

   The PCC MAY use the make-before-break or sub-group-based procedures
   described in [RFC4875] based on a local policy decision.

   The END-POINTS object MUST be carried in PCUpd message when N bit is
   set in LSP object for P2MP TE LSP.  If the END-POINTS object is
   missing, the receiving PCC MUST send a PCErr message with Error-
   type=6 (Mandatory Object missing) and Error-value=3 (END-POINTS
   object missing) (defined in [RFC5440].

7.3.  The PCReq Message

   As per Section 3.4 of [RFC6006], PCReq message is used for a P2MP
   path computation request.  This document extends the PCReq message
   such that a PCC MAY include the LSP object in the PCReq message if
   the stateful PCE P2MP capability has been negotiated on a PCEP
   session between the PCC and a PCE.

   The format of PCReq message is as follows:



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      <PCReq Message>::= <Common Header>
                         <request>
      where:
      <request>::= <RP>
                   <end-point-rro-pair-list>
                   [<LSP>]
                   [<OF>]
                   [<LSPA>]
                   [<BANDWIDTH>]
                   [<metric-list>]
                   [<IRO>]
                   [<LOAD-BALANCING>]

      where:
      <end-point-rro-pair-list>::=<END-POINTS>[<RRO-List>][<BANDWIDTH>]
                                  [<end-point-rro-pair-list>]

      <RRO-List>::=(<RRO>|<SRRO>)[<BANDWIDTH>][<RRO-List>]
      <metric-list>::=<METRIC>[<metric-list>]

7.4.  The PCRep Message

   As per Section 3.5 of [RFC6006], PCRep message is used for a P2MP
   path computation reply.  This document extends the PCRep message such
   that a PCE MAY include the LSP object in the PCRep message if the
   stateful PCE P2MP capability has been negotiated on a PCEP session
   between the PCC and a PCE.

   The format of PCRep message is as follows:






















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      <PCRep Message>::= <Common Header>
                         <response>

      <response>::=<RP>
                   [<end-point-path-pair-list>]
                   [<NO-PATH>]
                   [<attribute-list>]

      where:

      <end-point-path-pair-list>::=
                      [<END-POINTS>]<path>[<end-point-path-pair-list>]

      <path> ::= (<ERO>|<SERO>) [<path>]

      <attribute-list>::=[<LSP>]
                         [<OF>]
                         [<LSPA>]
                         [<BANDWIDTH>]
                         [<metric-list>]
                         [<IRO>]

7.5.  Example

7.5.1.  P2MP TE LSP Update Request

   LSP Update Request message is sent by an active stateful PCE to
   update the P2MP TE LSP parameters or attributes.  An example of a
   PCUpd message for P2MP TE LSP is described below:


              Common Header
              SRP
              LSP with P2MP flag set
              END-POINTS for leaf type 3
                ERO list

   In this example, a stateful PCE request updation of path taken by
   some of the leaves in a P2MP tree.  The update request uses the END-
   POINT type 3 (modified/reoptimized).  The ERO list represents the
   S2LS path after modification.  The update message does not need to
   encode the full P2MP tree in this case.

7.5.2.  P2MP TE LSP Report

   LSP State Report message is sent by a PCC to report or delegate the
   P2MP TE LSP.  An example of a PCRpt message for a delegated P2MP TE
   LSP is described below to add new leaves to an existing P2MP TE LSP:



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              Common Header
              LSP with P2MP flag set
              END-POINTS for leaf type 1
                S2LS (O=DOWN)
                ERO list (empty)

   An example of a PCRpt message for P2MP TE LSP is described below to
   prune leaves from an existing P2MP TE LSP:


              Common Header
              LSP with P2MP flag set
              END-POINTS for leaf type 2
                S2LS (O=UP)
                ERO list

   An example of a PCRpt message for a delegated P2MP TE LSP is
   described below to report status of leaves in an existing P2MP TE
   LSP:


              Common Header
              LSP with P2MP flag set
              END-POINTS for leaf type 3
                S2LS (O=UP)
                ERO list
              END-POINTS for leaf type 3
                S2LS (O=DOWN)
                ERO list

   An example of a PCRpt message for a non-delegated P2MP TE LSP is
   described below to report status of leaves:


              Common Header
              LSP with P2MP flag set
              END-POINTS for leaf type 4
                S2LS (O=ACTIVE)
                ERO list
              END-POINTS for leaf type 4
                S2LS (O=DOWN)
                ERO list

7.6.  Report and Update Message Fragmentation

   The total PCEP message length, including the common header, is 16
   bytes.  In certain scenarios the P2MP report and update request may
   not fit into a single PCEP message (e.g. initial report or update).



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   The F-bit is used in the LSP object to signal that the initial report
   or update was too large to fit into a single message and will be
   fragmented into multiple messages.  In order to identify the single
   report or update, each message will use the same PLSP-ID.

   Fragmentation procedure described below for report or update message
   is similar to [RFC6006]which describes request and response message
   fragmentation.

7.6.1.  Report Fragmentation Procedure

   If the initial report is too large to fit into a single report
   message, the PCC will split the report over multiple messages.  Each
   message sent to the PCE, except the last one, will have the F-bit set
   in the LSP object to signify that the report has been fragmented into
   multiple messages.  In order to identify that a series of report
   messages represents a single report, each message will use the same
   PLSP-ID.

   To indicate P2MP message fragmentation errors associated with a P2MP
   Report, a Error-Type (18) and a new error-value TBD is used if a PCE
   has not received the last piece of the fragmented message, it should
   send an error message to the PCC to signal that it has received an
   incomplete message (i.e., "Fragmented Report failure").

7.6.2.  Update Fragmentation Procedure

   Once the PCE computes and updates a path for some or all leaves in a
   P2MP TE LSP, an update message is sent to the PCC.  If the update is
   too large to fit into a single update message, the PCE will split the
   update over multiple messages.  Each update message sent by the PCE,
   except the last one, will have the F-bit set in the LSP object to
   signify that the update has been fragmented into multiple messages.
   In order to identify that a series of update messages represents a
   single update, each message will use the same PLSP-ID and SRP-ID-
   number.

   To indicate P2MP message fragmentation errors associated with a P2MP
   Update request, a Error-Type (18) and a new error-value TBD is used
   if a PCC has not received the last piece of the fragmented message,
   it should send an error message to the PCE to signal that it has
   received an incomplete message (i.e., "Fragmented Update failure").

8.  Non-Support of P2MP TE LSPs for Stateful PCE

   The PCEP protocol extensions described in this document for stateful
   PCEs with P2MP capability MUST NOT be used if PCE has not advertised
   its stateful capability with P2MP as per Section 5.2.  If the PCEP



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   Speaker on the PCC supports the extensions of this draft (understands
   the P2MP flag in the LSP object) but did not advertise this
   capability, then upon receipt of PCUpd message from the PCE, it
   SHOULD generate a PCErr with error-type 19 (Invalid Operation),
   error-value TBD (Attempted LSP Update Request for P2MP if active
   stateful PCE capability for P2MP was not advertised).  If the PCEP
   Speaker on the PCE supports the extensions of this draft (understands
   the P2MP flag in the LSP object) but did not advertise this
   capability, then upon receipt of a PCRpt message from the PCC, it
   SHOULD generate a PCErr with error-type 19 (Invalid Operation),
   error-value TBD (Attempted LSP State Report for P2MP if stateful PCE
   capability for P2MP was not advertised) and it will terminate the
   PCEP session.

   If a Stateful PCE receives a P2MP TE LSP report message and the PCE
   does not understand the P2MP flag in the LSP object, and therefore
   the PCEP extensions described in this document, then the Stateful PCE
   would act as per [I-D.ietf-pce-stateful-pce].

9.  Manageability Considerations

   All manageability requirements and considerations listed in
   [RFC5440], [RFC6006] and [I-D.ietf-pce-stateful-pce] apply to PCEP
   protocol extensions defined in this document.  In addition,
   requirements and considerations listed in this section apply.

9.1.  Control of Function and Policy

   A PCE or PCC implementation MUST allow configuring the stateful PCEP
   capability and the LSP Update capability for P2MP LSPs.

9.2.  Information and Data Models

   The PCEP MIB module SHOULD be extended to include advertised P2MP
   stateful capabilities, P2MP synchronization status, and P2MP
   delegation status etc.

9.3.  Liveness Detection and Monitoring

   Mechanisms defined in this document do not imply any new liveness
   detection and monitoring requirements in addition to those already
   listed in [RFC5440].

9.4.  Verify Correct Operations

   Mechanisms defined in this document do not imply any new operation
   verification requirements in addition to those already listed in
   [RFC5440], [RFC6006] and [I-D.ietf-pce-stateful-pce].



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9.5.  Requirements On Other Protocols

   Mechanisms defined in this document do not imply any new requirements
   on other protocols.

9.6.  Impact On Network Operations

   Mechanisms defined in this document do not have any impact on network
   operations in addition to those already listed in [RFC5440],
   [RFC6006] and [I-D.ietf-pce-stateful-pce].

10.  IANA Considerations

   This document requests IANA actions to allocate code points for the
   protocol elements defined in this document.

10.1.  PCE Capabilities in IGP Advertisements

   IANA is requested to allocate new bits in "PCE Capability Flags"
   registry for stateful PCE with P2MP capability as follows:



                 Bit      Meaning               Reference
                 TBD      Active Stateful       [This I-D]
                          PCE with P2MP
                 TBD      Passive Stateful      [This I-D]
                          PCE with P2MP

10.2.  STATEFUL-PCE-CAPABILITY TLV

   The following values are defined in this document for the Flags field
   in the STATEFUL-PCE-CAPABILITY-TLV (defined in
   [I-D.ietf-pce-stateful-pce]) in the OPEN object:


       Bit    Description           Reference

       TBD     P2MP-CAPABILITY      This.I-D
       TBD     P2MP-LSP-UPDATE-     This.I-D
               CAPABILITY










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10.3.  Extension of LSP Object

   This document requests that a registry is created to manage the Flags
   field of the LSP object (defined in [I-D.ietf-pce-stateful-pce]).
   New values are to be assigned by Standards Action [RFC5226].  Each
   bit should be tracked with the following qualities:

   o  Bit number (counting from bit 0 as the most significant bit)

   o  Capability description

   o  Defining RFC

   The following values are defined in this document:


       Bit    Description           Reference

       TBD     P2MP                 This.I-D
       TBD     Fragmentation        This.I-D




10.4.  Extension of PCEP-Error Object

   A new 19 (recommended values) defined in section 8.5 of
   [I-D.ietf-pce-stateful-pce].  The error-type 6 is defined in
   [RFC5440] and error-type 18 in [RFC6006].  This document extend the
   new Error-Values for those error types for the following error
   conditions:




















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       Error-Type  Meaning
          6        Mandatory Object missing
                     Error-value=TBD: S2LS object missing
                     Error-value=TBD: P2MP-LSP-IDENTIFIER TLV missing
          18       P2MP Fragmentation Error
                     Error-value= TBD. Fragmented Report
                         failure
                     Error-value= TBD. Fragmented Update
                         failure
          19       Invalid Operation
                     Error-value= TBD. Attempted LSP State Report
                         for P2MP if stateful PCE capability
                         for P2MP was not advertised
                     Error-value= TBD. Attempted LSP Update Request
                         for P2MP if active stateful PCE capability
                         for P2MP was not advertised



   Upon approval of this document, IANA is requested to make the
   assignment of a new error value for the existing "PCEP-ERROR Object
   Error Types and Values" registry located at
   http://www.iana.org/assignments/pcep/pcep.xhtml#pcep-error-object.

10.5.  PCEP TLV Type Indicators

   Upon approval of this document, IANA is requested to make the
   assignment of a new value for the existing "PCEP TLV Type Indicators"
   registry located at http://www.iana.org/assignments/pcep/
   pcep.xhtml#pcep-tlv-type-indicators.  This document defines the
   following new PCEP TLVs:


          Value     Meaning                           Reference
            TBD     P2MP-IPV4-LSP-IDENTIFIERS         This.I-D
            TBD     P2MP-IPV6-LSP-IDENTIFIERS         This.I-D



11.  Security Considerations

   The stateful operations on P2MP TE LSP are more CPU-intensive and
   also utilize more link bandwidth.  In the event of an unauthorized
   stateful P2MP operations, or a denial of service attack, the
   subsequent PCEP operations may be disruptive to the network.
   Consequently, it is important that implementations conform to the
   relevant security requirements of [RFC5440], [RFC6006] and




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   [I-D.ietf-pce-stateful-pce].  Further [I-D.ietf-pce-pceps] discusses
   an experimental approach to provide secure transport for PCEP.

12.  Acknowledgments

   Thanks to Quintin Zhao, Avantika and Venugopal Reddy for his
   comments.

13.  References

13.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC3209]  Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V.,
              and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP
              Tunnels", RFC 3209, DOI 10.17487/RFC3209, December 2001,
              <http://www.rfc-editor.org/info/rfc3209>.

   [RFC5088]  Le Roux, JL., Ed., Vasseur, JP., Ed., Ikejiri, Y., and R.
              Zhang, "OSPF Protocol Extensions for Path Computation
              Element (PCE) Discovery", RFC 5088, DOI 10.17487/RFC5088,
              January 2008, <http://www.rfc-editor.org/info/rfc5088>.

   [RFC5089]  Le Roux, JL., Ed., Vasseur, JP., Ed., Ikejiri, Y., and R.
              Zhang, "IS-IS Protocol Extensions for Path Computation
              Element (PCE) Discovery", RFC 5089, DOI 10.17487/RFC5089,
              January 2008, <http://www.rfc-editor.org/info/rfc5089>.

   [RFC5440]  Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
              Element (PCE) Communication Protocol (PCEP)", RFC 5440,
              DOI 10.17487/RFC5440, March 2009,
              <http://www.rfc-editor.org/info/rfc5440>.

   [RFC6006]  Zhao, Q., Ed., King, D., Ed., Verhaeghe, F., Takeda, T.,
              Ali, Z., and J. Meuric, "Extensions to the Path
              Computation Element Communication Protocol (PCEP) for
              Point-to-Multipoint Traffic Engineering Label Switched
              Paths", RFC 6006, DOI 10.17487/RFC6006, September 2010,
              <http://www.rfc-editor.org/info/rfc6006>.

   [I-D.ietf-pce-stateful-pce]
              Crabbe, E., Minei, I., Medved, J., and R. Varga, "PCEP
              Extensions for Stateful PCE", draft-ietf-pce-stateful-
              pce-13 (work in progress), December 2015.



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   [I-D.ietf-pce-stateful-sync-optimizations]
              Crabbe, E., Minei, I., Medved, J., Varga, R., Zhang, X.,
              and D. Dhody, "Optimizations of Label Switched Path State
              Synchronization Procedures for a Stateful PCE", draft-
              ietf-pce-stateful-sync-optimizations-04 (work in
              progress), November 2015.

13.2.  Informative References

   [RFC4655]  Farrel, A., Vasseur, J., and J. Ash, "A Path Computation
              Element (PCE)-Based Architecture", RFC 4655,
              DOI 10.17487/RFC4655, August 2006,
              <http://www.rfc-editor.org/info/rfc4655>.

   [RFC4857]  Fogelstroem, E., Jonsson, A., and C. Perkins, "Mobile IPv4
              Regional Registration", RFC 4857, DOI 10.17487/RFC4857,
              June 2007, <http://www.rfc-editor.org/info/rfc4857>.

   [RFC4875]  Aggarwal, R., Ed., Papadimitriou, D., Ed., and S.
              Yasukawa, Ed., "Extensions to Resource Reservation
              Protocol - Traffic Engineering (RSVP-TE) for Point-to-
              Multipoint TE Label Switched Paths (LSPs)", RFC 4875,
              DOI 10.17487/RFC4875, May 2007,
              <http://www.rfc-editor.org/info/rfc4875>.

   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              DOI 10.17487/RFC5226, May 2008,
              <http://www.rfc-editor.org/info/rfc5226>.

   [RFC5671]  Yasukawa, S. and A. Farrel, Ed., "Applicability of the
              Path Computation Element (PCE) to Point-to-Multipoint
              (P2MP) MPLS and GMPLS Traffic Engineering (TE)", RFC 5671,
              DOI 10.17487/RFC5671, October 2009,
              <http://www.rfc-editor.org/info/rfc5671>.

   [I-D.ietf-pce-stateful-pce-app]
              Zhang, X. and I. Minei, "Applicability of a Stateful Path
              Computation Element (PCE)", draft-ietf-pce-stateful-pce-
              app-05 (work in progress), October 2015.

   [I-D.ietf-pce-pce-initiated-lsp]
              Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "PCEP
              Extensions for PCE-initiated LSP Setup in a Stateful PCE
              Model", draft-ietf-pce-pce-initiated-lsp-05 (work in
              progress), October 2015.





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   [I-D.ietf-pce-pceps]
              Lopez, D., Dios, O., Wu, W., and D. Dhody, "Secure
              Transport for PCEP", draft-ietf-pce-pceps-06 (work in
              progress), November 2015.















































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Appendix A.  Contributor Addresses

   Yuji Kamite
   NTT Communications Corporation
   Granpark Tower
   3-4-1 Shibaura, Minato-ku
   Tokyo  108-8118
   Japan

   EMail: y.kamite@ntt.com

Authors' Addresses

   Udayasree Palle
   Huawei Technologies
   Divyashree Techno Park, Whitefield
   Bangalore, Karnataka  560037
   India

   EMail: udayasree.palle@huawei.com


   Dhruv Dhody
   Huawei Technologies
   Divyashree Techno Park, Whitefield
   Bangalore, Karnataka  560037
   India

   EMail: dhruv.ietf@gmail.com


   Yosuke Tanaka
   NTT Communications Corporation
   Granpark Tower
   3-4-1 Shibaura, Minato-ku
   Tokyo  108-8118
   Japan

   EMail: yosuke.tanaka@ntt.com


   Zafar Ali
   Cisco Systems

   EMail: zali@cisco.com






Palle, et al.             Expires July 13, 2016                [Page 26]


Internet-Draft                STATEFUL-P2MP                 January 2016


   Vishnu Pavan Beeram
   Juniper Networks

   EMail: vbeeram@juniper.net















































Palle, et al.             Expires July 13, 2016                [Page 27]


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