Subject: [bess] Protocol Action: 'Gateway Auto-Discovery and Route Advertisement for Segment Routing Enabled Site Interconnection' to Proposed Standard (draft-ietf-bess-datacenter-gateway-13.txt)

From: The IESG <[email-masked]>
Date: Wed, 28 Jul 2021 15:33:30 -0700

The IESG has approved the following document:
- 'Gateway Auto-Discovery and Route Advertisement for Segment Routing
   Enabled Site Interconnection'
  (draft-ietf-bess-datacenter-gateway-13.txt) as Proposed Standard

This document is the product of the BGP Enabled ServiceS Working Group.

The IESG contact persons are Alvaro Retana, John Scudder and Martin Vigoureux.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-datacenter-gateway/

Technical Summary

   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 protocol mechanism that can be used within a
   data center, and 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.

Working Group Summary

This draft provides a solution to allow the discovery of multiple DC gateway routers
in such scenarios. The document was developed over a period
of time in the BESS WG, but required an extended WG last call to ensure sufficient review,
as well as additional cross review of some points with the IDR WG.

Document Quality

Segment routing for supporting BGP based services between data centers is becoming
widely deployed. The document leverages relatively mature BGP extensions. 

The draft received a number of comments during WG last call which were addressed.

Personnel

Document Shepherd: Matthew Bocci
Responsible Area Director: Martin Vigoureux