PCEP Extensions for Associated Bidirectional Segment Routing (SR) Paths
draft-ietf-pce-sr-bidir-path-02

Document Type Active Internet-Draft (pce WG)
Last updated 2020-03-13
Replaces draft-li-pce-sr-bidir-path
Stream IETF
Intended RFC status (None)
Formats plain text xml pdf htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
PCE Working Group                                                  C. Li
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: September 14, 2020                                     W. Cheng
                                                            China Mobile
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                                Q. Xiong
                                                         ZTE Corporation
                                                          March 13, 2020

PCEP Extensions for Associated Bidirectional Segment Routing (SR) Paths
                    draft-ietf-pce-sr-bidir-path-02

Abstract

   The Path Computation Element Communication Protocol (PCEP) provides
   mechanisms for Path Computation Elements (PCEs) to perform path
   computations in response to Path Computation Clients (PCCs) requests.
   Segment routing (SR) leverages the source routing and tunneling
   paradigms.  The Stateful PCEP extensions allow stateful control of
   Segment Routing Traffic Engineering (TE) Paths.  Furthermore, PCEP
   can be used for computing SR TE paths in the network.

   This document defines PCEP extensions for grouping two unidirectional
   SR Paths (one in each direction in the network) into a single
   Associated Bidirectional SR Path.  The mechanisms defined in this
   document can also be applied using a Stateful PCE for both PCE-
   Initiated and PCC-Initiated LSPs, as well as when using a Stateless
   PCE.

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 https://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 September 14, 2020.

Li, et al.             Expires September 14, 2020               [Page 1]
Internet-Draft PCEP for Associated Bidirectional SR Paths     March 2020

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  PCEP Extensions . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Double-sided Bidirectional with Reverse LSP Association
           Group . . . . . . . . . . . . . . . . . . . . . . . . . .   5
       3.1.1.  Bidirectional LSP Association Group TLV . . . . . . .   5
   4.  PCEP Procedures . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  PCE Initiated Associated Bidirectional SR Paths . . . . .   7
     4.2.  PCC Initiated Associated Bidirectional SR Paths . . . . .   7
     4.3.  Stateless PCE . . . . . . . . . . . . . . . . . . . . . .   9
     4.4.  Bidirectional (B) Flag  . . . . . . . . . . . . . . . . .  10
     4.5.  State Synchronization . . . . . . . . . . . . . . . . . .  10
     4.6.  Error Handling  . . . . . . . . . . . . . . . . . . . . .  10
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .  10
     5.1.  Huawei's Commercial Delivery  . . . . . . . . . . . . . .  11
     5.2.  ZTE's Commercial Delivery . . . . . . . . . . . . . . . .  11
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  Manageability Considerations  . . . . . . . . . . . . . . . .  12
     7.1.  Control of Function and Policy  . . . . . . . . . . . . .  12
     7.2.  Information and Data Models . . . . . . . . . . . . . . .  12
     7.3.  Liveness Detection and Monitoring . . . . . . . . . . . .  12
     7.4.  Verify Correct Operations . . . . . . . . . . . . . . . .  12
     7.5.  Requirements On Other Protocols . . . . . . . . . . . . .  12
Show full document text