Segment Routing Egress Peer Engineering BGPLS Extensions
draft-previdi-idr-bgpls-segment-routing-epe-01

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Network Working Group                                    S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                                  S. Ray
Expires: April 28, 2015                                         K. Patel
                                                     Cisco Systems, Inc.
                                                                 J. Dong
                                                                 M. Chen
                                                     Huawei Technologies
                                                        October 25, 2014

        Segment Routing Egress Peer Engineering BGPLS Extensions
             draft-previdi-idr-bgpls-segment-routing-epe-01

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 BGPLS extension for exporting BGP egress
   point topology information (including its peers, interfaces and
   peering ASs) in a way that is exploitable in order to compute
   efficient Egress Point 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 April 28, 2015                 [Page 1]
Internet-Draft    Segment Routing EPE BGPLS Extensions      October 2014

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on April 28, 2015.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Segment Routing Documents . . . . . . . . . . . . . . . . . .   3
   3.  BGP Peering Segments  . . . . . . . . . . . . . . . . . . . .   3
   4.  Peer NLRI-Type  . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  BGP Router ID and Member ASN  . . . . . . . . . . . . . .   4
     4.2.  EPE Node Descriptors  . . . . . . . . . . . . . . . . . .   5
     4.3.  Peer Attributes . . . . . . . . . . . . . . . . . . . . .   6
   5.  Peer Node and Peer Adjacency Segments . . . . . . . . . . . .   6
     5.1.  Peer Node Segment (PeerNode SID)  . . . . . . . . . . . .   7
     5.2.  Peer Adjacency Segment (PeerAdj SID)  . . . . . . . . . .   8
     5.3.  Peer Set Segment (PeerSet SID)  . . . . . . . . . . . . .   9
   6.  Illustration  . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Reference Diagram . . . . . . . . . . . . . . . . . . . .   9
       6.1.1.  PeerNode for Node D . . . . . . . . . . . . . . . . .  10
       6.1.2.  PeerNode for Node H . . . . . . . . . . . . . . . . .  11
       6.1.3.  PeerNode for Node E . . . . . . . . . . . . . . . . .  11
       6.1.4.  PeerAdj for Node E, Link 1  . . . . . . . . . . . . .  12
       6.1.5.  PeerAdj for Node E, Link 2  . . . . . . . . . . . . .  12
   7.  BGPLS-EPE TLV/Sub-TLV Code Points Summary . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Manageability Considerations  . . . . . . . . . . . . . . . .  13
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