Segment Routing interoperability with LDP
draft-ietf-spring-segment-routing-ldp-interop-00

The information below is for an old version of the document
Document Type Active Internet-Draft (spring WG)
Last updated 2015-10-15
Replaces draft-filsfils-spring-segment-routing-ldp-interop
Stream IETF
Intended RFC status Proposed Standard
Formats plain text pdf html bibtex
Reviews
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                   C. Filsfils, Ed.
Internet-Draft                                           S. Previdi, Ed.
Intended status: Standards Track                             A. Bashandy
Expires: April 16, 2016                              Cisco Systems, Inc.
                                                             B. Decraene
                                                            S. Litkowski
                                                                  Orange
                                                        October 14, 2015

               Segment Routing interoperability with LDP
            draft-ietf-spring-segment-routing-ldp-interop-00

Abstract

   A Segment Routing (SR) 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.

   The Segment Routing architecture can be directly applied to the MPLS
   data plane with no change in the forwarding plane.  This drafts
   describes how Segment Routing operates in a network where LDP is
   deployed and in the case where SR-capable and non-SR-capable nodes
   coexist.

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/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Filsfils, et al.         Expires April 16, 2016                 [Page 1]
Internet-Draft           Segment Routing and LDP            October 2015

   This Internet-Draft will expire on April 16, 2016.

Copyright Notice

   Copyright (c) 2015 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  SR/LDP Ship-in-the-night coexistence  . . . . . . . . . . . .   3
     2.1.  MPLS2MPLS co-existence  . . . . . . . . . . . . . . . . .   5
     2.2.  IP2MPLS co-existence  . . . . . . . . . . . . . . . . . .   5
   3.  Migration from LDP to SR  . . . . . . . . . . . . . . . . . .   6
   4.  SR and LDP Interworking . . . . . . . . . . . . . . . . . . .   7
     4.1.  LDP to SR . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  SR to LDP . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Leveraging SR benefits for LDP-based traffic  . . . . . . . .   9
     5.1.  Eliminating Directed LDP Session  . . . . . . . . . . . .  11
     5.2.  Guaranteed FRR coverage . . . . . . . . . . . . . . . . .  11
   6.  Inter-AS Option C, Carrier's Carrier and Seamless MPLS  . . .  13
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   8.  Manageability Considerations  . . . . . . . . . . . . . . . .  13
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   11. Contributors' Addresses . . . . . . . . . . . . . . . . . . .  13
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     12.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   Segment Routing, as described in [I-D.ietf-spring-segment-routing],
   can be used on top of the MPLS data plane without any modification as
   described in [I-D.ietf-spring-segment-routing-mpls].

Filsfils, et al.         Expires April 16, 2016                 [Page 2]
Show full document text