BGP Extensions for Unified SID in TE Policy
draft-liu-idr-segment-routing-te-policy-complement-01

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IDR Working Group                                               Yao. Liu
Internet-Draft                                              Shaofu. Peng
Intended status: Standards Track                         ZTE Corporation
Expires: September 28, 2020                               March 27, 2020

              BGP Extensions for Unified SID in TE Policy
         draft-liu-idr-segment-routing-te-policy-complement-01

Abstract

   This document defines extensions to BGP in order to advertise Unified
   SIDs in SR-TE policies.

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   provisions of BCP 78 and BCP 79.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  SR policy with Unified SID  . . . . . . . . . . . . . . . . .   2
     2.1.  BGP Extensions  . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Controller Processing . . . . . . . . . . . . . . . . . .   5
     2.3.  Head-end Processing . . . . . . . . . . . . . . . . . . .   6
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Segment Routing [RFC8402] leverages the source routing paradigm.  An
   ingress node steers a packet through an ordered list of
   instructions,called segments.

   [I-D.ietf-spring-segment-routing-policy] details the concepts of SR
   Policy and steering into an SR Policy.

   [I-D.ietf-idr-segment-routing-te-policy] specifies the way to use BGP
   to distribute one or more of the candidate paths of an SR Policy to
   the headend of that policy.

   With increasing requirements for a shortened identifier in a segment
   routing network with the IPv6 data plane,
   [I-D.mirsky-6man-unified-id-sr] proposed an extension of SRH that
   enables the use of a shorter segment identifier, such as 32-bits
   Label format SID or 32-bits IP address format SID.

   This document defines extensions to BGP in order to advertise Unified
   SIDs in SR-TE policies.

   Firstly, we focus on how to carry 32-bits IP address format U-SID,
   other type of U-SID (such as 16-bits) will be considered in future
   version.

2.  SR policy with Unified SID

   As discussed in [I-D.ietf-spring-srv6-network-programming], the node
   with the SRv6 capability will maintain its local SID table.  A Local
   SID is generally composed of two parts, that is, LOC:FUNCT, or may
   carry arguments at the same time, that is, LOC:FUNCT:ARGS.

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   FUNCT indicates the local function of the packet on the node that
   generates the LOC.ARGS may contain information related to traffic and
   services, or any other information required for executing the
   function.LOC indicates locator.  In most cases, other nodes in the
   network can forward packets to the node that generates this LOC
   according to the corresponding routing table entries.

   The controller plane protocol can also use B:N to represent an LOC,
   where B is SRv6 SID Locator Block and N to represent node N.  In
   other words, the structure of a complete SID is B:N:FUNCT:ARGS.
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