BGP-LS extensions for Segment Routing BGP Egress Peer Engineering
draft-ietf-idr-bgpls-segment-routing-epe-13

Document Type Active Internet-Draft (idr WG)
Last updated 2017-06-20
Replaces draft-previdi-idr-bgpls-segment-routing-epe
Stream IETF
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Network Working Group                                    S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: December 22, 2017                                      K. Patel
                                                            Arrcus, Inc.
                                                                  S. Ray
                                                  Individual Contributor
                                                                 J. Dong
                                                     Huawei Technologies
                                                           June 20, 2017

   BGP-LS extensions for Segment Routing BGP Egress Peer Engineering
              draft-ietf-idr-bgpls-segment-routing-epe-13

Abstract

   Segment Routing (SR) leverages source routing.  A node steers a
   packet through a controlled set of instructions, called segments, by
   prepending the packet with an SR header.  A segment can represent any
   instruction, topological or service-based.  SR allows to enforce a
   flow through any topological path and service chain while maintaining
   per-flow state only at the ingress node of the SR domain.

   The Segment Routing architecture can be directly applied to the MPLS
   dataplane with no change on the forwarding plane.  It requires minor
   extension to the existing link-state routing protocols.

   This document outline a BGP-LS extension for exporting BGP peering
   node topology information (including its peers, interfaces and
   peering ASs) in a way that is exploitable in order to compute
   efficient BGP Peering Engineering policies and strategies.

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].

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 December 22, 2017               [Page 1]
Internet-Draft    Segment Routing EPE BGP-LS Extensions        June 2017

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on December 22, 2017.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Segment Routing Documents . . . . . . . . . . . . . . . . . .   3
   3.  BGP Peering Segments  . . . . . . . . . . . . . . . . . . . .   4
   4.  Link NLRI for BGP-EPE Connectivity Description  . . . . . . .   5
     4.1.  BGP Router ID and Member ASN  . . . . . . . . . . . . . .   5
     4.2.  Mandatory BGP-EPE Node Descriptors  . . . . . . . . . . .   6
     4.3.  Optional BGP-EPE Node Descriptors . . . . . . . . . . . .   7
     4.4.  Link Attributes . . . . . . . . . . . . . . . . . . . . .   7
   5.  Peer-Node and Peer-Adj SIDs . . . . . . . . . . . . . . . . .   9
     5.1.  Peer-Node-SID . . . . . . . . . . . . . . . . . . . . . .  10
     5.2.  Peer-Adj-SID  . . . . . . . . . . . . . . . . . . . . . .  11
     5.3.  Peer-Set-SID  . . . . . . . . . . . . . . . . . . . . . .  12
   6.  Illustration  . . . . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Reference Diagram . . . . . . . . . . . . . . . . . . . .  12
     6.2.  Peer-Node-SID for Node D  . . . . . . . . . . . . . . . .  14
     6.3.  Peer-Node-SID for Node F  . . . . . . . . . . . . . . . .  15
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