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Label Switched Path Stitching with Generalized Multiprotocol Label Switching Traffic Engineering (GMPLS TE)
RFC 5150

Network Working Group                                        A. Ayyangar
Request for Comments: 5150                                   K. Kompella
Category: Standards Track                               Juniper Networks
                                                             JP. Vasseur
                                                     Cisco Systems, Inc.
                                                               A. Farrel
                                                      Old Dog Consulting
                                                           February 2008

                  Label Switched Path Stitching with
Generalized Multiprotocol Label Switching Traffic Engineering (GMPLS TE)

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.

Abstract

   In certain scenarios, there may be a need to combine several
   Generalized Multiprotocol Label Switching (GMPLS) Label Switched
   Paths (LSPs) such that a single end-to-end (e2e) LSP is realized and
   all traffic from one constituent LSP is switched onto the next LSP.
   We will refer to this as "LSP stitching", the key requirement being
   that a constituent LSP not be allocated to more than one e2e LSP.
   The constituent LSPs will be referred to as "LSP segments" (S-LSPs).

   This document describes extensions to the existing GMPLS signaling
   protocol (Resource Reservation Protocol-Traffic Engineering (RSVP-
   TE)) to establish e2e LSPs created from S-LSPs, and describes how the
   LSPs can be managed using the GMPLS signaling and routing protocols.

   It may be possible to configure a GMPLS node to switch the traffic
   from an LSP for which it is the egress, to another LSP for which it
   is the ingress, without requiring any signaling or routing extensions
   whatsoever and such that the operation is completely transparent to
   other nodes.  This will also result in LSP stitching in the data
   plane.  However, this document does not cover this scenario of LSP
   stitching.

Ayyangar, et al.            Standards Track                     [Page 1]
RFC 5150              LSP Stitching with GMPLS TE          February 2008

Table of Contents

   1. Introduction ....................................................2
      1.1. Conventions Used in This Document ..........................3
   2. Comparison with LSP Hierarchy ...................................3
   3. Usage ...........................................................4
      3.1. Triggers for LSP Segment Setup .............................4
      3.2. Applications ...............................................5
   4. Routing Aspects .................................................5
   5. Signaling Aspects ...............................................6
      5.1. RSVP-TE Signaling Extensions ...............................7
           5.1.1. Creating and Preparing an LSP Segment for
                  Stitching ...........................................7
                  5.1.1.1. Steps to Support Penultimate Hop
                           Popping ....................................8
           5.1.2. Stitching the e2e LSP to the LSP Segment ............9
           5.1.3. RRO Processing for e2e LSPs ........................10
           5.1.4. Teardown of LSP Segments ...........................11
           5.1.5. Teardown of e2e LSPs ...............................11
      5.2. Summary of LSP Stitching Procedures .......................12
           5.2.1. Example Topology ...................................12
           5.2.2. LSP Segment Setup ..................................12
           5.2.3. Setup of an e2e LSP ................................13
           5.2.4. Stitching of an e2e LSP into an LSP Segment ........13
   6. Security Considerations ........................................14
   7. IANA Considerations ............................................15
      7.1. Attribute Flags for LSP_ATTRIBUTES Object .................15
      7.2. New Error Codes ...........................................15
   8. Acknowledgments ................................................16
   9. References .....................................................16
      9.1. Normative References ......................................16
      9.2. Informative References ....................................17

1.  Introduction

   A stitched Generalized Multiprotocol Label Switching (GMPLS) Traffic
   Engineering (TE) Label Switched Path (LSP) is built from a set of
   different "LSP segments" (S-LSPs) that are connected together in the

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