Segment Routing PCE Delegation in BGP
draft-wang-idr-sr-policy-pce-delegation-00

Document Type Active Internet-Draft (individual)
Authors Yang Wang  , Hao Li  , Yuanxiang Qiu  , Liping Yang  , Mengxiao Chen 
Last updated 2021-02-02
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Inter-Domain Routing Working Group                            Y. Wang
Internet-Draft                                                  H. Li
Intended status: Standards Track                               Y. Qiu
Expires: August 2, 2021                                       L. Yang
                                                              M. Chen
                                                     H3C Technologies
                                                     February 2, 2021

                Segment Routing PCE Delegation in BGP
              draft-wang-idr-sr-policy-pce-delegation-00

Abstract

   Segment Routing is a source routing paradigm that explicitly 
   indicates the forwarding path for packets at the ingress node. An 
   SR policy is a set of candidate SR paths consisting of one or more 
   segment lists with necessary path attributes. The headend of an SR 
   Policy may learn multiple candidate paths for an SR Policy. 
   Candidate paths may be learned via a number of different mechanisms,
   e.g., CLI, NetConf, PCEP, or BGP.
   
   The Path Computation Element (PCE) provides path computation 
   functions in support of traffic engineering in Multi Protocol Label 
   Switching (MPLS) and Generalized MPLS (GMPLS) networks.    

   Currently, when a controller uses BGP to deploy an SR Policy, there 
   is no way to encode PCE delegation related options. The only way to 
   import a PCE delegation is through local configuration management,
   e.g., Netconf, CLI or gRPC. 
   
   This document defines extensions to BGP to distribute PCE 
   delegation information within an SR policy.
   
Status of This Memo

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

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   This Internet-Draft will expire on August 2, 2021.

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Copyright Notice

   Copyright (c) 2021 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
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   described in the Simplified BSD License.
   
Table of Contents
    
   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  SR Policy for PCE Delegation. . . . . . . . . . . . . . . . .   4
     3.1.  PCE Delegation Sub-TLV  . . . . . . . . . . . . . . . . .   6
   4.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
      9.1.  Normative References . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

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1.  Introduction
    
   Segment routing (SR) [RFC8402] is a source routing paradigm that
   explicitly indicates the forwarding path for packets at the 
   ingress node.  The ingress node steers packets into a specific 
   path according to the Segment Routing Policy (SR Policy) as 
   defined in[I-D.ietf-spring-segment-routing-policy].  In order 
   to distribute SR policies to the headend, 
   [I-D.ietf-idr-segment-routing-te-policy] specifies a mechanism by 
   using BGP.
   
   [RFC5440] describes the Path Computation Element (PCE) Communication 
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