BGP Flexible Color-Based Tunnel Selection
draft-shen-idr-flexible-color-tunnel-selection-01

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Internet Engineering Task Force                               Yimin Shen
Internet-Draft                                          Juniper Networks
Intended status: Standards Track                              Ravi Singh
Expires: August 6, 2020                           Individual Contributor
                                                             Yuji Kamite
                                                      NTT Communications
                                                        February 3, 2020

               BGP Flexible Color-Based Tunnel Selection
           draft-shen-idr-flexible-color-tunnel-selection-01

Abstract

   This document discusses color-based tunnel selection for BGP payload
   prefixes.  It defines a set of extended mapping modes, and describes
   how to use them to construct tunnel selection schemes for flexible
   tunnel selection.  Tunnel selection schemes can be implemented as
   policies on routers performing tunnel selection, or signaled by next
   hop routers or a central controller by using the BGP extensions
   specified in this document.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Specification of Requirements . . . . . . . . . . . . . . . .   4
   3.  Extended Mapping Modes  . . . . . . . . . . . . . . . . . . .   4
   4.  Tunnel Selection Scheme and Operation . . . . . . . . . . . .   6
   5.  Provisioning of Tunnel Selection Schemes  . . . . . . . . . .   7
   6.  BGP Tunnel Encapsulation Attribute Extensions . . . . . . . .   8
     6.1.  Wildcard Tunnel Type  . . . . . . . . . . . . . . . . . .   8
     6.2.  Color Tunnel Selection Scheme Sub-TLV . . . . . . . . . .   8
       6.2.1.  Extended Mapping Mode Sub-sub-TLV . . . . . . . . . .   9
       6.2.2.  Encoding  . . . . . . . . . . . . . . . . . . . . . .  10
       6.2.3.  Decoding  . . . . . . . . . . . . . . . . . . . . . .  10
     6.3.  Association between Color Tunnel Selection Scheme Sub-TLV
           and Tunnel Type . . . . . . . . . . . . . . . . . . . . .  11
   7.  Relationship with Color-Only Bits of Color Extended Community  11
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     11.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   In an overlay network using BGP for payload prefix distribution,
   transporting the packets of a payload prefix from a BGP router to the
   next BGP router relies on the selection of a transport tunnel.  This
   selection may be based on various attributes of the prefix, such as
   BGP next hop, color, and information in the Tunnel Encapsulation
   Attribute [BGP-TUNNEL-ENCAP], etc.

   In one tunnel selection model, color is used as a primary criterion
   along with BGP next hop or tunnel endpoint address (contained in a
   Tunnel Endpoint sub-TLV of the Tunnel Encapsulation Attribute).  This
   model is referred to as "color-based" tunnel selection in this
   document.  The model is gaining many use cases today due to its
   general applicability.  In particular, color as a generic notion may
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