Inter-Domain MPLS and GMPLS Traffic Engineering -- Resource Reservation Protocol-Traffic Engineering (RSVP-TE) Extensions
RFC 5151

Network Working Group                                     A. Farrel, Ed.
Request for Comments: 5151                            Old Dog Consulting
Updates: 3209, 3473                                          A. Ayyangar
Category: Standards Track                               Juniper Networks
                                                             JP. Vasseur
                                                     Cisco Systems, Inc.
                                                           February 2008

          Inter-Domain MPLS and GMPLS Traffic Engineering --
 Resource Reservation Protocol-Traffic Engineering (RSVP-TE) Extensions

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

   This document describes procedures and protocol extensions for the
   use of Resource Reservation Protocol-Traffic Engineering (RSVP-TE)
   signaling in Multiprotocol Label Switching-Traffic Engineering
   (MPLS-TE) packet networks and Generalized MPLS (GMPLS) packet and
   non-packet networks to support the establishment and maintenance of
   Label Switched Paths that cross domain boundaries.

   For the purpose of this document, a domain is considered to be any
   collection of network elements within a common realm of address space
   or path computation responsibility.  Examples of such domains include
   Autonomous Systems, Interior Gateway Protocol (IGP) routing areas,
   and GMPLS overlay networks.

Farrel, et al.              Standards Track                     [Page 1]
RFC 5151      Inter-Domain MPLS & GMPLS RSVP-TE Extensions February 2008

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................3
      1.2. Terminology ................................................4
   2. Signaling Overview ..............................................4
      2.1. Signaling Options ..........................................5
   3. Procedures on the Domain Border Node ............................6
      3.1. Rules on ERO Processing ....................................8
      3.2. LSP Setup Failure and Crankback ...........................10
      3.3. RRO Processing across Domains .............................11
      3.4. Notify Message Processing .................................11
   4. RSVP-TE Signaling Extensions ...................................12
      4.1. Control of Downstream Choice of Signaling Method ..........12
   5. Protection and Recovery of Inter-Domain TE LSPs ................13
      5.1. Fast Recovery Support Using MPLS-TE Fast Reroute (FRR) ....14
           5.1.1. Failure within a Domain (Link or Node Failure) .....14
           5.1.2. Failure of Link at Domain Border ...................14
           5.1.3. Failure of a Border Node ...........................15
      5.2. Protection and Recovery of GMPLS LSPs .....................15
   6. Reoptimization of Inter-Domain TE LSPs .........................16
   7. Backward Compatibility .........................................17
   8. Security Considerations ........................................18
   9. IANA Considerations ............................................20
      9.1. Attribute Flags for LSP_Attributes Object .................20
      9.2. New Error Codes ...........................................20
   10. Acknowledgments ...............................................21
   11. References ....................................................21
       11.1. Normative References ....................................21
       11.2. Informative References ..................................22

Farrel, et al.              Standards Track                     [Page 2]
RFC 5151      Inter-Domain MPLS & GMPLS RSVP-TE Extensions February 2008

1.  Introduction

   The requirements for inter-area and inter-AS (Autonomous System)
   Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) are
   stated in [RFC4105] and [RFC4216], respectively.  Many of these
   requirements also apply to Generalized MPLS (GMPLS) networks.  The
   framework for inter-domain MPLS-TE is provided in [RFC4726].

   This document presents procedures and extensions to Resource
   Reservation Protocol-Traffic Engineering (RSVP-TE) signaling for the
   setup and maintenance of traffic engineered Label Switched Paths (TE
   LSPs) that span multiple domains in MPLS-TE or GMPLS networks.  The
   signaling procedures described in this document are applicable to