IPv6 Segment Routing Header (SRH)
draft-previdi-6man-segment-routing-header-07

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Document Type Active Internet-Draft (individual)
Last updated 2015-07-20
Replaced by draft-ietf-6man-segment-routing-header
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Network Working Group                                    S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: January 21, 2016                                       B. Field
                                                                 Comcast
                                                                I. Leung
                                                   Rogers Communications
                                                                E. Aries
                                                                Facebook
                                                               E. Vyncke
                                                     Cisco Systems, Inc.
                                                               D. Lebrun
                                        Universite Catholique de Louvain
                                                           July 20, 2015

                   IPv6 Segment Routing Header (SRH)
              draft-previdi-6man-segment-routing-header-07

Abstract

   Segment Routing (SR) allows a node to steer a packet through a
   controlled set of instructions, called segments, by prepending a SR
   header to the packet.  A segment can represent any instruction,
   topological or service-based.  SR allows to enforce a flow through
   any path (topological, or application/service based) while
   maintaining per-flow state only at the ingress node to the SR domain.

   Segment Routing can be applied to the IPv6 data plane with the
   addition of a new type of Routing Extension Header.  This draft
   describes the Segment Routing Extension Header Type and how it is
   used by SR capable nodes.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

Previdi, et al.         Expires January 21, 2016                [Page 1]
Internet-Draft      IPv6 Segment Routing Header (SRH)          July 2015

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on January 21, 2016.

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   document authors.  All rights reserved.

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Table of Contents

   1.  Structure of this document  . . . . . . . . . . . . . . . . .   3
   2.  Segment Routing Documents . . . . . . . . . . . . . . . . . .   3
   3.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Data Planes supporting Segment Routing  . . . . . . . . .   4
     3.2.  Illustration  . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Abstract Routing Model  . . . . . . . . . . . . . . . . . . .   8
     4.1.  Segment Routing Global Block (SRGB) . . . . . . . . . . .   9
     4.2.  Traffic Engineering with SR . . . . . . . . . . . . . . .   9
     4.3.  Segment Routing Database  . . . . . . . . . . . . . . . .  10
   5.  IPv6 Instantiation of Segment Routing . . . . . . . . . . . .  11
     5.1.  Segment Identifiers (SIDs) and SRGB . . . . . . . . . . .  11
       5.1.1.  Node-SID  . . . . . . . . . . . . . . . . . . . . . .  11
       5.1.2.  Adjacency-SID . . . . . . . . . . . . . . . . . . . .  11
     5.2.  Segment Routing Extension Header (SRH)  . . . . . . . . .  12
       5.2.1.  SRH and RFC2460 behavior  . . . . . . . . . . . . . .  15
   6.  SRH Procedures  . . . . . . . . . . . . . . . . . . . . . . .  16
     6.1.  Segment Routing Operations  . . . . . . . . . . . . . . .  16
     6.2.  Segment Routing Node Functions  . . . . . . . . . . . . .  16
       6.2.1.  Ingress SR Node . . . . . . . . . . . . . . . . . . .  17
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