Segment Routing BGP Egress Peer Engineering BGP-LS Extensions
draft-ietf-idr-bgpls-segment-routing-epe-08

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Document Type Active Internet-Draft (idr WG)
Last updated 2017-02-15
Replaces draft-previdi-idr-bgpls-segment-routing-epe
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Network Working Group                                    S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: August 19, 2017                                        K. Patel
                                                            Arrcus, Inc.
                                                                 J. Dong
                                                                 M. Chen
                                                     Huawei Technologies
                                                       February 15, 2017

     Segment Routing BGP Egress Peer Engineering BGP-LS Extensions
              draft-ietf-idr-bgpls-segment-routing-epe-08

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

Previdi, et al.          Expires August 19, 2017                [Page 1]
Internet-Draft  Segment Routing BGP-EPE BGP-LS Extensions  February 2017

   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 August 19, 2017.

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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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.  BGP-EPE Node Descriptors  . . . . . . . . . . . . . . . .   6
     4.3.  Link Attributes . . . . . . . . . . . . . . . . . . . . .   7
   5.  Peer Node and Peer Adjacency Segments . . . . . . . . . . . .   9
     5.1.  Peer Node Segment (Peer-Node-SID) . . . . . . . . . . . .   9
     5.2.  Peer Adjacency Segment (Peer-Adj-SID) . . . . . . . . . .  10
     5.3.  Peer Set Segment  . . . . . . . . . . . . . . . . . . . .  11
   6.  Illustration  . . . . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Reference Diagram . . . . . . . . . . . . . . . . . . . .  12
     6.2.  Peer Node Segment for Node D  . . . . . . . . . . . . . .  14
     6.3.  Peer Node Segment for Node H  . . . . . . . . . . . . . .  14
     6.4.  Peer Node Segment for Node E  . . . . . . . . . . . . . .  14
     6.5.  Peer Adjacency Segment for Node E, Link 1 . . . . . . . .  15
     6.6.  Peer Adjacency Segment for Node E, Link 2 . . . . . . . .  15
   7.  Implementation Status . . . . . . . . . . . . . . . . . . . .  16
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
     8.1.  New BGP-LS Protocol-ID  . . . . . . . . . . . . . . . . .  17
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