Advertising Segment Routing Traffic Engineering Policies in BGP
draft-previdi-idr-segment-routing-te-policy-00

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Last updated 2016-03-20
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: September 19, 2016                                 S. Sivabalan
                                                     Cisco Systems, Inc.
                                                               P. Mattes
                                                               Microsoft
                                                          March 18, 2016

    Advertising Segment Routing Traffic Engineering Policies in BGP
             draft-previdi-idr-segment-routing-te-policy-00

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).  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

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   This Internet-Draft will expire on September 19, 2016.

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   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
   Provisions Relating to IETF Documents

Previdi, et al.        Expires September 19, 2016               [Page 1]
Internet-Draft     Segment Routing TE Policies in BGP         March 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  SR TE Policy Encoding . . . . . . . . . . . . . . . . . . . .   4
     2.1.  SR TE Policy SAFI and NLRI  . . . . . . . . . . . . . . .   4
       2.1.1.  SR TE Policies and Add-Paths  . . . . . . . . . . . .   5
     2.2.  SR TE Policy and Tunnel Encapsulation Attribute . . . . .   5
     2.3.  Remote Endpoint and Color . . . . . . . . . . . . . . . .   6
     2.4.  SR TE Policy Sub-TLVs . . . . . . . . . . . . . . . . . .   7
       2.4.1.  SR TE Binding SID Sub-TLV . . . . . . . . . . . . . .   7
       2.4.2.  Weight Sub-TLV  . . . . . . . . . . . . . . . . . . .   8
       2.4.3.  Segment List Sub-TLV  . . . . . . . . . . . . . . . .   9
       2.4.4.  Segment Sub-TLV . . . . . . . . . . . . . . . . . . .   9
   3.  SR TE Policy Operations . . . . . . . . . . . . . . . . . . .  11
     3.1.  Multipath Operation . . . . . . . . . . . . . . . . . . .  12
     3.2.  Binding SID TLV . . . . . . . . . . . . . . . . . . . . .  12
     3.3.  Reception of an SR TE Policy  . . . . . . . . . . . . . .  13
     3.4.  Announcing BGP SR TE Policies . . . . . . . . . . . . . .  14
     3.5.  Flowspec and SR TE Policies . . . . . . . . . . . . . . .  14
   4.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  15
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     7.2.  Informational References  . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   Segment Routing (SR) technology leverages the source routing and
   tunneling paradigms.  [I-D.ietf-spring-segment-routing] describes the
   SR architecture.  [I-D.ietf-spring-segment-routing-mpls] describes
   its instantiation on the MPLS data plane and
   [I-D.ietf-6man-segment-routing-header] describes the Segment Routing
   instantiation over the IPv6 data plane.
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