Extensions to the Path Computation Element Communication Protocol (PCEP) for Backup Egress of a Traffic Engineering Label Switched Path
draft-chen-pce-compute-backup-egress-11

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Internet Engineering Task Force                                  H. Chen
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                             May 4, 2017
Expires: November 5, 2017

Extensions to the Path Computation Element Communication Protocol (PCEP)
     for Backup Egress of a Traffic Engineering Label Switched Path
              draft-chen-pce-compute-backup-egress-11.txt

Abstract

   This document presents extensions to the Path Computation Element
   Communication Protocol (PCEP) for a PCC to send a request for
   computing a backup egress for an MPLS TE P2MP LSP or an MPLS TE P2P
   LSP to a PCE and for a PCE to compute the backup egress and reply to
   the PCC with a computation result for the backup egress.

Status of this Memo

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

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   This Internet-Draft will expire on November 5, 2017.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Conventions Used in This Document  . . . . . . . . . . . . . .  3
   4.  Extensions to PCEP . . . . . . . . . . . . . . . . . . . . . .  3
     4.1.  Backup Egress Capability Advertisement . . . . . . . . . .  4
       4.1.1.  Capability TLV in Existing PCE Discovery Protocol  . .  4
       4.1.2.  Open Message Extension . . . . . . . . . . . . . . . .  5
     4.2.  Request and Reply Message Extension  . . . . . . . . . . .  6
       4.2.1.  RP Object Extension  . . . . . . . . . . . . . . . . .  6
       4.2.2.  External Destination Nodes . . . . . . . . . . . . . .  6
       4.2.3.  Constraints between Egress and Backup Egress . . . . . 11
       4.2.4.  Constraints for Backup Path  . . . . . . . . . . . . . 11
       4.2.5.  Backup Egress Node . . . . . . . . . . . . . . . . . . 11
       4.2.6.  Backup Egress PCEP Error Objects and Types . . . . . . 12
       4.2.7.  Request Message Format . . . . . . . . . . . . . . . . 12
       4.2.8.  Reply Message Format . . . . . . . . . . . . . . . . . 12
   5.  Security  Considerations . . . . . . . . . . . . . . . . . . . 13
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 13
     6.1.  Backup Egress Capability Flag  . . . . . . . . . . . . . . 13
     6.2.  Backup Egress Capability TLV . . . . . . . . . . . . . . . 14
     6.3.  Request Parameter Bit Flags  . . . . . . . . . . . . . . . 14
     6.4.  PCEP Objects . . . . . . . . . . . . . . . . . . . . . . . 14
   7.  Acknowledgement  . . . . . . . . . . . . . . . . . . . . . . . 14
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 15
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 15

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1.  Introduction

   RFC 4655 "A Path Computation Element-(PCE) Based Architecture"
   describes a set of building blocks for constructing solutions to
   compute Point-to-Point (P2P) Traffic Engineering (TE) label switched
   paths across multiple areas or Autonomous System (AS) domains.  A
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