Gateway Auto-Discovery and Route Advertisement for Segment Routing Enabled Domain Interconnection
draft-drake-bess-datacenter-gateway-04

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BESS Working Group                                              J. Drake
Internet-Draft                                                 A. Farrel
Intended status: Standards Track                                E. Rosen
Expires: January 2, 2018                                Juniper Networks
                                                                K. Patel
                                                            Arrcus, Inc.
                                                                L. Jalil
                                                                 Verizon
                                                            July 1, 2017

   Gateway Auto-Discovery and Route Advertisement for Segment Routing
                     Enabled Domain Interconnection
                 draft-drake-bess-datacenter-gateway-04

Abstract

   Data centers have become critical components of the infrastructure
   used by network operators to provide services to their customers.
   Data centers are attached to the Internet or a backbone network by
   gateway routers.  One data center typically has more than one gateway
   for commercial, load balancing, and resiliency reasons.

   Segment routing is a popular protocol mechanism for operating within
   a data center, but also for steering traffic that flows between two
   data center sites.  In order that one data center site may load
   balance the traffic it sends to another data center site it needs to
   know the complete set of gateway routers at the remote data center,
   the points of connection from those gateways to the backbone network,
   and the connectivity across the backbone network.

   Segment routing may also be operated in other domains, such as access
   networks.  Those domains also need to be connected across backbone
   networks through gateways.

   This document defines a mechanism using the BGP Tunnel Encapsulation
   attribute to allow each gateway router to advertise the routes to the
   prefixes in the segment routing domains to which it provides access,
   and also to advertise on behalf of each other gateway to the same
   segment routing 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 [RFC2119].

Drake, et al.            Expires January 2, 2018                [Page 1]
Internet-Draft               SR DC Gateways                    July 2017

Status of This Memo

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  SR Domain Gateway Auto-Discovery  . . . . . . . . . . . . . .   5
   3.  Relationship to BGP Link State and Egress Peer Engineering  .   6
   4.  Advertising an SR Domain Route Externally . . . . . . . . . .   6
   5.  Encapsulation . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Manageability Considerations  . . . . . . . . . . . . . . . .   7
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   8
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