Inter-Domain Traffic Steering with BGP Labeled Colored Unicast (BGP-LCU)
draft-szarecki-idr-bgp-lcu-traffic-steering-00

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IDR Working Group                                                L. Chan
Internet-Draft                                          R. Szarecki, Ed.
Intended status: Standards Track                        Juniper Networks
Expires: January 8, 2020                                    July 7, 2019

Inter-Domain Traffic Steering with BGP Labeled Colored Unicast (BGP-LCU)
             draft-szarecki-idr-bgp-lcu-traffic-steering-00

Abstract

   This document describes technology that enables for Inter-Domain
   signaling of existence of E2E path that satisfy high-level traffic
   treatment behavior intent.  The inter-domain path is built by the BGP
   protocol, as a concatenation of per TE-domain internal paths
   (segments), provisioned by one of existing intra-domain techniques.
   The traffic treatment behavior is encoded as an integer value called
   as "COLOR".  The domain internal paths/tunnels are marked as
   satisfying given traffic treatment behavior.  Then the tunnel
   destination and its COLOR are exchanged between TE-Domains using a
   new BGP LABELED-COLORED-UNICAST NLRI (BGP-LCU) defined in this
   document.

Status of This Memo

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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

Chan & Szarecki          Expires January 8, 2020                [Page 1]
Internet-Draft Inter-Domain Traffic Steering with BGP-LCU      July 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Conventions used in this document . . . . . . . . . . . . . .   4
   3.  Traffic treatment behavior intent (T-intent)  . . . . . . . .   5
     3.1.  COLOR . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  COLOR name spaces . . . . . . . . . . . . . . . . . . . .   6
   4.  Scaling Consideration . . . . . . . . . . . . . . . . . . . .   6
   5.  BGP labeled-colored-unicast NLRI  . . . . . . . . . . . . . .   6
     5.1.  BGP capability negotiation  . . . . . . . . . . . . . . .   6
     5.2.  BGP UPDATE message MP_REACH_NLRI  . . . . . . . . . . . .   7
     5.3.  BGP explicit  WITHDRAWN message . . . . . . . . . . . . .   9
     5.4.  Some BGP attribute considerations . . . . . . . . . . . .  10
       5.4.1.  BGP Next-Hop  . . . . . . . . . . . . . . . . . . . .  10
       5.4.2.  Prefix SID  . . . . . . . . . . . . . . . . . . . . .  10
       5.4.3.  Color Extended Community  . . . . . . . . . . . . . .  10
       5.4.4.  Tunnel encapsulation  . . . . . . . . . . . . . . . .  10
   6.  BGP operation . . . . . . . . . . . . . . . . . . . . . . . .  11
     6.1.  Injection of labeled colored unicast route to BGP . . . .  11
       6.1.1.  Injecting from colored routes . . . . . . . . . . . .  11
       6.1.2.  Injections from non-colored labeled routes  . . . . .  13
       6.1.3.  Injections from non-colored non-labeled routes  . . .  13
     6.2.  Receiving BGP-LCU from eBGP (single hop)  . . . . . . . .  14
     6.3.  Receiving BGP-LCU from iBGP or multihop-eBGP  . . . . . .  14
     6.4.  Advertising BGP-LCU over eBGP session and iBGP session
           with BGP NH changed (NH-self) . . . . . . . . . . . . . .  15
     6.5.  Advertising BGP-LCU over iBGP session when BGP NH remain
           unchanged.  . . . . . . . . . . . . . . . . . . . . . . .  15
     6.6.  Label value assignment procedure  . . . . . . . . . . . .  16
   7.  Deployment and Operation Consideration  . . . . . . . . . . .  16
     7.1.  Building label stack  . . . . . . . . . . . . . . . . . .  16
       7.1.1.  Purpose of multiple-label stack . . . . . . . . . . .  16
       7.1.2.  Ingress recursive resolution  . . . . . . . . . . . .  17
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