Segment Routing Prefix SID extensions for BGP
draft-ietf-idr-bgp-prefix-sid-27

Document Type Active Internet-Draft (idr WG)
Last updated 2018-08-22 (latest revision 2018-06-26)
Replaces draft-keyupate-idr-bgp-prefix-sid
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IDR                                                           S. Previdi
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                          A. Lindem, Ed.
Expires: December 28, 2018                                 Cisco Systems
                                                          A. Sreekantiah

                                                              H. Gredler
                                                            RtBrick Inc.
                                                           June 26, 2018

             Segment Routing Prefix SID extensions for BGP
                    draft-ietf-idr-bgp-prefix-sid-27

Abstract

   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through an ordered list of instructions, called
   segments.  A segment can represent any instruction, topological or
   service-based.  The ingress node prepends an 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 on the ingress node of the SR domain.  An SR domain
   is defined as a single administrative domain for global SID
   assignment.

   This document defines an optional, transitive BGP attribute for
   announcing BGP Prefix Segment Identifiers (BGP Prefix-SID)
   information and the specification for SR-MPLS SIDs.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

Previdi, et al.         Expires December 28, 2018               [Page 1]
Internet-Draft                                                 June 2018

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on December 28, 2018.

Copyright Notice

   Copyright (c) 2018 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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   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  MPLS BGP Prefix SID . . . . . . . . . . . . . . . . . . . . .   4
   3.  BGP Prefix-SID Attribute  . . . . . . . . . . . . . . . . . .   5
     3.1.  Label-Index TLV . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Originator SRGB TLV . . . . . . . . . . . . . . . . . . .   6
   4.  Receiving BGP Prefix-SID Attribute  . . . . . . . . . . . . .   8
     4.1.  MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . .   8
   5.  Advertising BGP Prefix-SID Attribute  . . . . . . . . . . . .  10
     5.1.  MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . .  10
   6.  Error Handling of BGP Prefix-SID Attribute  . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   8.  Manageability Considerations  . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  14
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     12.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

Previdi, et al.         Expires December 28, 2018               [Page 2]
Internet-Draft                                                 June 2018

1.  Introduction

   The Segment Routing (SR) architecture leverages the source routing
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