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

Document Type Active Internet-Draft (bess WG)
Last updated 2019-08-21
Replaces draft-drake-bess-datacenter-gateway
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BESS Working Group                                             A. Farrel
Internet-Draft                                        Old Dog Consulting
Intended status: Standards Track                                J. Drake
Expires: February 22, 2020                                      E. Rosen
                                                        Juniper Networks
                                                                K. Patel
                                                            Arrcus, Inc.
                                                                L. Jalil
                                                                 Verizon
                                                         August 21, 2019

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

Abstract

   Data centers are 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 use 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.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

Farrel, et al.          Expires February 22, 2020               [Page 1]
Internet-Draft               SR DC Gateways                  August 2019

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   This Internet-Draft will expire on February 22, 2020.

Copyright Notice

   Copyright (c) 2019 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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   (https://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  SR Domain Gateway Auto-Discovery  . . . . . . . . . . . . . .   5
   4.  Relationship to BGP Link State and Egress Peer Engineering  .   7
   5.  Advertising an SR Domain Route Externally . . . . . . . . . .   7
   6.  Encapsulation . . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   9.  Manageability Considerations  . . . . . . . . . . . . . . . .   9
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     11.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

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