Advertising Segment Routing Traffic Engineering Policies in BGP
draft-previdi-idr-segment-routing-te-policy-02

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Last updated 2016-10-30 (latest revision 2016-05-27)
Replaces draft-sreekantiah-idr-segment-routing-te
Replaced by draft-ietf-idr-segment-routing-te-policy
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Network Working Group                                    S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                          A. Sreekantiah
Expires: May 3, 2017                                        S. Sivabalan
                                                     Cisco Systems, Inc.
                                                               P. Mattes
                                                               Microsoft
                                                                E. Rosen
                                                        Juniper Networks
                                                                  S. Lin
                                                                  Google
                                                        October 30, 2016

    Advertising Segment Routing Traffic Engineering Policies in BGP
             draft-previdi-idr-segment-routing-te-policy-02

Abstract

   This document defines a new BGP SAFI with a new NLRI in order to
   advertise a Segment Routing Traffic Engineering Policy (SR TE
   Policy).  An SR TE Policy is a set of explicit paths represented by
   one or more segment lists.  The SR TE Policy is advertised along with
   the Tunnel Encapsulation Attribute for which this document also
   defines new sub-TLVs.  An SR TE policy is advertised with the
   information that will be used by the node receiving the advertisement
   in order to instantiate the policy in its forwarding table and to
   steer traffic according to the policy.

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
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   This Internet-Draft will expire on May 3, 2017.

Previdi, et al.            Expires May 3, 2017                  [Page 1]
Internet-Draft     Segment Routing TE Policies in BGP       October 2016

Copyright Notice

   Copyright (c) 2016 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  . . . . . . . . . . . . . . . . . . . . . . . .   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.  Weight Sub-TLV  . . . . . . . . . . . . . . . . . . .   9
       2.4.4.  Segment List Sub-TLV  . . . . . . . . . . . . . . . .  10
       2.4.5.  Segment Sub-TLV . . . . . . . . . . . . . . . . . . .  11
   3.  SR TE Policy Operations . . . . . . . . . . . . . . . . . . .  20
     3.1.  Configuration and Advertisement of SR TE Policies . . . .  20
     3.2.  Multipath Operation . . . . . . . . . . . . . . . . . . .  21
     3.3.  Binding SID TLV . . . . . . . . . . . . . . . . . . . . .  21
     3.4.  Reception of an SR TE Policy  . . . . . . . . . . . . . .  21
       3.4.1.  Acceptance of a SR TE Policy Update . . . . . . . . .  22
       3.4.2.  Usable SR TE Policy . . . . . . . . . . . . . . . . .  23
       3.4.3.  Instantiation of an SR TE Policy  . . . . . . . . . .  24
       3.4.4.  Propagation of an SR TE Policy  . . . . . . . . . . .  25
     3.5.  Steering Traffic into a SR TE Policy  . . . . . . . . . .  25
     3.6.  Flowspec and SR TE Policies . . . . . . . . . . . . . . .  26
   4.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  26
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
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