Advertising Segment Routing Policies in BGP
draft-previdi-idr-segment-routing-te-policy-06

Document Type Active Internet-Draft (idr WG)
Last updated 2017-06-16 (latest revision 2017-06-15)
Replaces draft-sreekantiah-idr-segment-routing-te
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Network Working Group                                    S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: December 17, 2017                                     P. Mattes
                                                               Microsoft
                                                                E. Rosen
                                                        Juniper Networks
                                                                  S. Lin
                                                                  Google
                                                           June 15, 2017

              Advertising Segment Routing Policies in BGP
             draft-previdi-idr-segment-routing-te-policy-06

Abstract

   This document defines a new BGP SAFI with a new NLRI in order to
   advertise a candidate path of a Segment Routing Policy (SR Policy).
   An SR Policy is a set of candidate paths consisting of one or more
   segment lists.  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.
   This document specifies the way in which BGP may be used to
   distribute candidate paths.  New sub-TLVs for the Tunnel
   Encapsulation Attribute are defined.

Status of This Memo

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   This Internet-Draft will expire on December 17, 2017.

Previdi, et al.         Expires December 17, 2017               [Page 1]
Internet-Draft       Segment Routing Policies in BGP           June 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  SR TE Policy Encoding . . . . . . . . . . . . . . . . . . . .   5
     2.1.  SR TE Policy SAFI and NLRI  . . . . . . . . . . . . . . .   5
     2.2.  SR TE Policy and Tunnel Encapsulation Attribute . . . . .   7
     2.3.  Remote Endpoint and Color . . . . . . . . . . . . . . . .   8
     2.4.  SR TE Policy Sub-TLVs . . . . . . . . . . . . . . . . . .   8
       2.4.1.  Preference sub-TLV  . . . . . . . . . . . . . . . . .   8
       2.4.2.  SR TE Binding SID Sub-TLV . . . . . . . . . . . . . .   9
       2.4.3.  Segment List Sub-TLV  . . . . . . . . . . . . . . . .  10
   3.  Extended Color Community  . . . . . . . . . . . . . . . . . .  21
   4.  SR Policy Operations  . . . . . . . . . . . . . . . . . . . .  21
     4.1.  Configuration and Advertisement of SR TE Policies . . . .  22
     4.2.  Reception of an SR Policy NLRI  . . . . . . . . . . . . .  22
       4.2.1.  Acceptance of an SR Policy NLRI . . . . . . . . . . .  22
       4.2.2.  Usable SR Policy NLRI . . . . . . . . . . . . . . . .  23
       4.2.3.  Passing a usable SR Policy NLRI to the SRTE Process .  24
       4.2.4.  Propagation of an SR Policy . . . . . . . . . . . . .  24
     4.3.  Flowspec and SR Policies  . . . . . . . . . . . . . . . .  24
   5.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  24
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  25
   7.  Implementation Status . . . . . . . . . . . . . . . . . . . .  25
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
     8.1.  Existing Registry: Subsequent Address Family Identifiers
           (SAFI) Parameters . . . . . . . . . . . . . . . . . . . .  26
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