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Routing Extensions for Discovery of Multiprotocol (MPLS) Label Switch Router (LSR) Traffic Engineering (TE) Mesh Membership
RFC 4972

Document type: RFC - Proposed Standard (July 2007)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4972 (Proposed Standard)
Responsible AD: Ross Callon
Send notices to: ccamp-chairs@tools.ietf.org

Network Working Group                                   JP. Vasseur, Ed.
Request for Comments: 4972                            Cisco Systems, Inc
Category: Standards Track                                JL. Leroux, Ed.
                                                          France Telecom
                                                             S. Yasukawa
                                                                     NTT
                                                              S. Previdi
                                                               P. Psenak
                                                      Cisco Systems, Inc
                                                               P. Mabbey
                                                                 Comcast
                                                               July 2007

       Routing Extensions for Discovery of Multiprotocol (MPLS)
   Label Switch Router (LSR) Traffic Engineering (TE) Mesh Membership

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   The setup of a full mesh of Multi-Protocol Label Switching (MPLS)
   Traffic Engineering (TE) Label Switched Paths (LSP) among a set of
   Label Switch Routers (LSR) is a common deployment scenario of MPLS
   Traffic Engineering either for bandwidth optimization, bandwidth
   guarantees or fast rerouting with MPLS Fast Reroute.  Such deployment
   may require the configuration of a potentially large number of TE
   LSPs (on the order of the square of the number of LSRs).  This
   document specifies Interior Gateway Protocol (IGP) routing extensions
   for Intermediate System-to-Intermediate System (IS-IS) and Open
   Shortest Path First (OSPF) so as to provide an automatic discovery of
   the set of LSRs members of a mesh in order to automate the creation
   of such mesh of TE LSPs.

Vasseur, et al.             Standards Track                     [Page 1]
RFC 4972        Discovery of MPLS LSR TE Mesh Membership       July 2007

Table of Contents

   1. Introduction ....................................................2
   2. Definitions .....................................................3
      2.1. Conventions Used in This Document ..........................4
   3. Description of a TE Mesh-Group ..................................4
   4. TE-MESH-GROUP TLV Formats .......................................4
      4.1. OSPF TE-MESH-GROUP TLV Format ..............................4
      4.2. IS-IS TE-MESH-GROUP Sub-TLV Format .........................7
   5. Elements of Procedure ...........................................9
      5.1. OSPF .......................................................9
      5.2. IS-IS .....................................................10
   6. Backward Compatibility .........................................11
   7. IANA Considerations ............................................11
      7.1. OSPF ......................................................11
      7.2. IS-IS .....................................................11
   8. Security Considerations ........................................12
   9. Acknowledgements ...............................................12
   10. References ....................................................12
      10.1. Normative References .....................................12
      10.2. Informative References ...................................13

1.  Introduction

   There are two well-known approaches in deploying MPLS Traffic
   Engineering:

   (1) The so-called "strategic" approach that consists of setting up a
   full mesh of TE LSPs between a set of LSRs.

   (2) The so-called "tactical" approach, where a set of TE LSPs are
   provisioned on well-identified "hot spots" in order to alleviate a
   congestion resulting, for instance, from an unexpected traffic growth
   in some parts of the network.

   The setup of a full mesh of TE LSPs among a set of LSRs is a common
   deployment scenario of MPLS Traffic Engineering either for bandwidth
   optimization, bandwidth guarantees, or fast rerouting with MPLS Fast
   Reroute.  Setting up a full mesh of TE LSPs between N LSRs requires
   the configuration of a potentially large number of TE LSPs (O(N^2)).
   Furthermore, the addition of any new LSR in the mesh requires the
   configuration of N additional TE LSPs on the new LSR and one new TE
   LSP on every LSR of the existing mesh destined to this new LSR, which

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