Segment Routing with MPLS data plane
draft-ietf-spring-segment-routing-mpls-04

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Document Type Active Internet-Draft (spring WG)
Last updated 2016-03-18
Replaces draft-filsfils-spring-segment-routing-mpls
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Intended RFC status Proposed Standard
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Network Working Group                                   C. Filsfils, Ed.
Internet-Draft                                           S. Previdi, Ed.
Intended status: Standards Track                             A. Bashandy
Expires: September 19, 2016                          Cisco Systems, Inc.
                                                             B. Decraene
                                                            S. Litkowski
                                                                  Orange
                                                            M. Horneffer
                                                        Deutsche Telekom
                                                               R. Shakir
                                                     Jive Communications
                                                             J. Tantsura
                                                                Ericsson
                                                               E. Crabbe
                                                              Individual
                                                          March 18, 2016

                  Segment Routing with MPLS data plane
               draft-ietf-spring-segment-routing-mpls-04

Abstract

   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through a controlled set of instructions, called
   segments, by prepending the packet with an SR header.  A segment can
   represent any instruction, topological or service-based.  SR allows
   to enforce a flow through any topological path and service chain
   while maintaining per-flow state only at the ingress node to the SR
   domain.

   Segment Routing can be directly applied to the MPLS architecture with
   no change in the forwarding plane.  This drafts describes how Segment
   Routing operates on top of the MPLS data plane.

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

Filsfils, et al.       Expires September 19, 2016               [Page 1]
Internet-Draft          Segment Routing with MPLS             March 2016

   working documents as Internet-Drafts.  The list of current Internet-
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   This Internet-Draft will expire on September 19, 2016.

Copyright Notice

   Copyright (c) 2016 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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Illustration  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  MPLS Instantiation of Segment Routing . . . . . . . . . . . .   4
   4.  IGP Segments Examples . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Example 1 . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Example 2 . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.3.  Example 3 . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.4.  Example 4 . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.5.  Example 5 . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Other Examples of MPLS Segments . . . . . . . . . . . . . . .   9
     5.1.  LDP LSP segment combined with IGP segments  . . . . . . .   9
     5.2.  RSVP-TE LSP segment combined with IGP segments  . . . . .  10
   6.  Segment List History  . . . . . . . . . . . . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   8.  Manageability Considerations  . . . . . . . . . . . . . . . .  11
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  11
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
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