Segment Routing Prefix SID extensions for BGP
draft-ietf-idr-bgp-prefix-sid-07

Document Type Active Internet-Draft (idr WG)
Last updated 2017-10-17
Replaces draft-keyupate-idr-bgp-prefix-sid
Stream IETF
Intended RFC status Proposed Standard
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IDR                                                      S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                               A. Lindem
Expires: April 20, 2018                                   A. Sreekantiah
                                                           Cisco Systems
                                                              H. Gredler
                                                            RtBrick Inc.
                                                        October 17, 2017

             Segment Routing Prefix SID extensions for BGP
                    draft-ietf-idr-bgp-prefix-sid-07

Abstract

   Segment Routing (SR) architecture allows a node to steer a packet
   flow through any topological path and service chain by leveraging
   source routing.  The ingress node prepends a SR header to a packet
   containing a set of segment identifiers (SID).  Each SID represents a
   topological or a service-based instruction.  Per-flow state is
   maintained only at the ingress node of the SR domain.

   This document defines a new optional, transitive BGP attribute for
   announcing BGP Prefix Segment Identifiers (BGP Prefix-SID)
   information.

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]
   only when they appear in all upper case.  They may also appear in
   lower or mixed case as English words, without any normative meaning.

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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Previdi, et al.          Expires April 20, 2018                 [Page 1]
Internet-Draft                                              October 2017

   This Internet-Draft will expire on April 20, 2018.

Copyright Notice

   Copyright (c) 2017 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  BGP-Prefix-SID  . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  MPLS BGP Prefix SID . . . . . . . . . . . . . . . . . . .   4
     2.2.  IPv6 Prefix Segment . . . . . . . . . . . . . . . . . . .   5
   3.  BGP-Prefix-SID Attribute  . . . . . . . . . . . . . . . . . .   5
     3.1.  Label-Index TLV . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  IPv6 SID  . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.3.  Originator SRGB TLV . . . . . . . . . . . . . . . . . . .   7
   4.  Receiving BGP-Prefix-SID Attribute  . . . . . . . . . . . . .   9
     4.1.  MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . .   9
     4.2.  IPv6 Dataplane  . . . . . . . . . . . . . . . . . . . . .  10
   5.  Announcing BGP-Prefix-SID Attribute . . . . . . . . . . . . .  10
     5.1.  MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . .  10
     5.2.  IPv6 Dataplane  . . . . . . . . . . . . . . . . . . . . .  11
   6.  Error Handling of BGP-Prefix-SID Attribute  . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   8.  Manageability Considerations  . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
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