Advertising Segment Routing Policies in BGP
draft-previdi-idr-segment-routing-te-policy-05

Document Type Active Internet-Draft (individual)
Last updated 2017-02-24
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                          A. Sreekantiah
Expires: August 28, 2017                                    S. Sivabalan
                                                     Cisco Systems, Inc.
                                                               P. Mattes
                                                               Microsoft
                                                                E. Rosen
                                                        Juniper Networks
                                                                  S. Lin
                                                                  Google
                                                       February 24, 2017

              Advertising Segment Routing Policies in BGP
             draft-previdi-idr-segment-routing-te-policy-05

Abstract

   This document defines a new BGP SAFI with a new NLRI in order to
   advertise an explicit path of a Segment Routing Policy (SR Policy).
   An SR Policy is a set of dynamic and/or explicit paths each
   represented by one or more segment lists.  The path of the SR Policy
   is advertised along with the Tunnel Encapsulation Attribute for which
   this document also defines new sub-TLVs.

Status of This Memo

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   This Internet-Draft will expire on August 28, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Previdi, et al.          Expires August 28, 2017                [Page 1]
Internet-Draft       Segment Routing Policies in BGP       February 2017

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Table of Contents

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