SR Policies Extensions for Path Segment and Bidirectional Path in BGP-LS
draft-li-idr-bgp-ls-sr-policy-path-segment-03

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Interdomain Routing Working Group                                  C. Li
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                                 H. Chen
Expires: February 9, 2020                                  China Telecom
                                                                 M. Chen
                                                                 J. Dong
                                                                   Z. Li
                                                     Huawei Technologies
                                                          August 8, 2019

SR Policies Extensions for Path Segment and Bidirectional Path in BGP-LS
             draft-li-idr-bgp-ls-sr-policy-path-segment-03

Abstract

   This document specifies the way of collecting configuration and
   states of SR policies carrying Path Segment and bidirectional path
   information by using BPG-LS.  Such information can be used by
   external conponents for many use cases such as performance
   measurement, path re-optimization and end-to-end protection.

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 RFC 2119 [RFC2119].

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 February 9, 2020.

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Copyright Notice

   Copyright (c) 2019 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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Carrying SR Path Sub-TLVs in BGP-LS . . . . . . . . . . . . .   3
     3.1.  SR Path Segment Sub-TLV . . . . . . . . . . . . . . . . .   5
     3.2.  Sub-TLVs for Bidirectional Path . . . . . . . . . . . . .   6
       3.2.1.  SR Bidirectional Path Sub-TLV . . . . . . . . . . . .   6
       3.2.2.  SR Reverse Path Segment List Sub-TLV  . . . . . . . .   7
   4.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  BGP-LS TLVs . . . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  BGP-LS SR Segment Descriptors . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Segment routing (SR) [RFC8402] is a source routing paradigm that
   allows the ingress node steers packets into a specific path according
   to the Segment Routing Policy
   [I-D.ietf-spring-segment-routing-policy].

   However, the SR Policies defined in
   [I-D.ietf-spring-segment-routing-policy] only supports unidirectional
   SR paths and there is no path ID in a Segment List to identify an SR
   path.  For identifying an SR path and supporting bidirectional path
   [I-D.ietf-spring-mpls-path-segment], new policies carrying Path
   Segment and bidirectional path information are defined in

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   [I-D.li-idr-sr-policy-path-segment-distribution], as well as the
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