Segment Routing Centralized BGP Egress Peer Engineering
draft-ietf-spring-segment-routing-central-epe-06

Document Type Active Internet-Draft (spring WG)
Last updated 2017-08-30 (latest revision 2017-06-20)
Replaces draft-filsfils-spring-segment-routing-central-epe
Stream IETF
Intended RFC status Informational
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Document shepherd Bruno Decraene
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Network Working Group                                   C. Filsfils, Ed.
Internet-Draft                                           S. Previdi, Ed.
Intended status: Informational                       Cisco Systems, Inc.
Expires: December 22, 2017                                      E. Aries
                                                        Juniper Networks
                                                            D. Afanasiev
                                                                  Yandex
                                                           June 20, 2017

        Segment Routing Centralized BGP Egress Peer Engineering
            draft-ietf-spring-segment-routing-central-epe-06

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 a
   minor extension to the existing link-state routing protocols.

   This document illustrates the application of Segment Routing to solve
   the BGP Egress Peer Engineering (BGP-EPE) requirement.  The SR-based
   BGP-EPE solution allows a centralized (Software Defined Network, SDN)
   controller to program any egress peer policy at ingress border
   routers or at hosts within the domain.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

Filsfils, et al.        Expires December 22, 2017               [Page 1]
Internet-Draft       Segment Routing Centralized EPE           June 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
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 22, 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Problem Statement . . . . . . . . . . . . . . . . . . . .   3
   2.  BGP Peering Segments  . . . . . . . . . . . . . . . . . . . .   6
   3.  Distribution of Topology and TE Information using BGP-LS  . .   6
     3.1.  PeerNode SID to D . . . . . . . . . . . . . . . . . . . .   7
     3.2.  PeerNode SID to E . . . . . . . . . . . . . . . . . . . .   8
     3.3.  PeerNode SID to F . . . . . . . . . . . . . . . . . . . .   8
     3.4.  First PeerAdj to F  . . . . . . . . . . . . . . . . . . .   8
     3.5.  Second PeerAdj to F . . . . . . . . . . . . . . . . . . .   9
     3.6.  Fast Reroute (FRR)  . . . . . . . . . . . . . . . . . . .   9
   4.  BGP-EPE Controller  . . . . . . . . . . . . . . . . . . . . .  10
     4.1.  Valid Paths From Peers  . . . . . . . . . . . . . . . . .  10
     4.2.  Intra-Domain Topology . . . . . . . . . . . . . . . . . .  11
     4.3.  External Topology . . . . . . . . . . . . . . . . . . . .  11
     4.4.  SLA characteristics of each peer  . . . . . . . . . . . .  12
     4.5.  Traffic Matrix  . . . . . . . . . . . . . . . . . . . . .  12
     4.6.  Business Policies . . . . . . . . . . . . . . . . . . . .  12
     4.7.  BGP-EPE Policy  . . . . . . . . . . . . . . . . . . . . .  12
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