Egress Peer Engineering using BGP-LU
draft-gredler-idr-bgplu-epe-12

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Last updated 2020-07-03
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Inter-Domain Routing                                     H. Gredler, Ed.
Internet-Draft                                              RtBrick Inc.
Intended status: Informational                          K. Vairavakkalai
Expires: January 4, 2021                                 C. Ramachandran
                                                          B. Rajagopalan
                                                                E. Aries
                                                  Juniper Networks, Inc.
                                                                 L. Fang
                                                                    eBay
                                                           July 03, 2020

                  Egress Peer Engineering using BGP-LU
                     draft-gredler-idr-bgplu-epe-12

Abstract

   The MPLS source routing paradigm provides path control for both
   intra- and inter- Autonomous System (AS) traffic.  RSVP-TE is
   utilized for intra-AS path control.  This documents outlines how MPLS
   routers may use the BGP labeled unicast protocol (BGP-LU) for doing
   traffic-engineering on inter-AS links.

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.

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   This Internet-Draft will expire on January 4, 2021.

Gredler, et al.          Expires January 4, 2021                [Page 1]
Internet-Draft    Egress Peer Engineering using BGP-LU         July 2020

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   Copyright (c) 2020 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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Motivation, Rationale and Applicability . . . . . . . . . . .   3
   3.  Sample Topology . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Loopback IP addresses and Router-IDs  . . . . . . . . . .   4
     3.2.  Link IP addresses . . . . . . . . . . . . . . . . . . . .   4
   4.  Service Route Advertisement . . . . . . . . . . . . . . . . .   5
   5.  Egress Next-hop Advertisement . . . . . . . . . . . . . . . .   5
     5.1.  iBGP meshing and BGP nexthop rewrite policy . . . . . . .   6
     5.2.  Single-hop eBGP . . . . . . . . . . . . . . . . . . . . .   7
     5.3.  Multi-hop eBGP  . . . . . . . . . . . . . . . . . . . . .   7
     5.4.  Grouping of Peers . . . . . . . . . . . . . . . . . . . .   8
   6.  Egress Link Protection  . . . . . . . . . . . . . . . . . . .   9
     6.1.  FRR backup routes . . . . . . . . . . . . . . . . . . . .   9
       6.1.1.  Local links . . . . . . . . . . . . . . . . . . . . .  10
       6.1.2.  Remote BGP-LU labels  . . . . . . . . . . . . . . . .  10
       6.1.3.  Local IP forwarding tables  . . . . . . . . . . . . .  10
   7.  Dynamic link utilization  . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     11.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Today, BGP-LU [RFC3107] is used both as an intra-AS
   [I-D.ietf-mpls-seamless-mpls] and inter-AS routing protocol.  BGP-LU
   may advertise a MPLS transport path between IGP regions and
   Autonomous Systems.  Those paths may span one or more router hops.
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