BGP Color-Aware Routing(CAR)
draft-dskc-bess-bgp-car-00

Document Type Active Internet-Draft (individual)
Authors Dhananjaya Rao  , Swadesh Agrawal  , Clarence Filsfils  , Ketan Talaulikar 
Last updated 2021-02-22
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BESS WorkGroup                                                    D. Rao
Internet-Draft                                                S. Agrawal
Intended status: Standards Track                             C. Filsfils
Expires: August 26, 2021                                   K. Talaulikar
                                                           Cisco Systems
                                                       February 22, 2021

                      BGP Color-Aware Routing(CAR)
                       draft-dskc-bess-bgp-car-00

Abstract

   This document describes a BGP based routing solution to establish
   end-to-end intent-aware paths across a multi-domain service provider
   transport network.  This solution is called BGP Color-Aware Routing
   (BGP CAR).

Status of This Memo

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   This Internet-Draft will expire on August 26, 2021.

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   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Rao, et al.              Expires August 26, 2021                [Page 1]
Internet-Draft        BGP Color-Aware Routing(CAR)         February 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Objectives  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Concepts  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Color . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Colored vs Color-Aware  . . . . . . . . . . . . . . . . .   4
     2.3.  Color Domains . . . . . . . . . . . . . . . . . . . . . .   4
     2.4.  BGP Color-Aware Routing . . . . . . . . . . . . . . . . .   5
   3.  BGP extensions for CAR  . . . . . . . . . . . . . . . . . . .   5
     3.1.  Why a new SAFI is required  . . . . . . . . . . . . . . .   5
     3.2.  Data Model of New SAFI  . . . . . . . . . . . . . . . . .   5
     3.3.  Extensible, future-proof encoding . . . . . . . . . . . .   6
     3.4.  BGP CAR Family  . . . . . . . . . . . . . . . . . . . . .   6
       3.4.1.  BGP CAR SAFI NLRI Format  . . . . . . . . . . . . . .   7
       3.4.2.  CAR NLRI Type . . . . . . . . . . . . . . . . . . . .   8
       3.4.3.  Local-Color-Mapping (LCM) Extended Community  . . . .  12
     3.5.  BGP transport CAR Route Origination . . . . . . . . . . .  13
     3.6.  BGP CAR Next-Hop Processing . . . . . . . . . . . . . . .  13
       3.6.1.  Validation  . . . . . . . . . . . . . . . . . . . . .  13
       3.6.2.  Resolution  . . . . . . . . . . . . . . . . . . . . .  14
     3.7.  AIGP Metric Computation . . . . . . . . . . . . . . . . .  15
     3.8.  Multiple color domains  . . . . . . . . . . . . . . . . .  15
   4.  Steering a Colored Service Route onto an (E, C) BGP CAR route  17
     4.1.  E2E BGP transport CAR intent realized using IGP FA  . . .  17
     4.2.  E2E BGP transport CAR intent realized using SR Policy . .  19
     4.3.  BGP transport CAR intent realized in a section of the
           network . . . . . . . . . . . . . . . . . . . . . . . . .  21
     4.4.  Transit network domains that do not support CAR . . . . .  23
   5.  Color Mapping Scenarios . . . . . . . . . . . . . . . . . . .  24
     5.1.  Single color domain containing network domains with N:N
           color distribution  . . . . . . . . . . . . . . . . . . .  24
     5.2.  Single color domain containing network domains with N:M
           color distribution  . . . . . . . . . . . . . . . . . . .  25
     5.3.  Multiple color domains  . . . . . . . . . . . . . . . . .  25
   6.  Intent Use-cases  . . . . . . . . . . . . . . . . . . . . . .  26
   7.  Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
     7.1.  Data plane does not have to scale to Colors * PEs . . . .  27
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