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ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and GMPLS Traffic Engineering
RFC 5316

Network Working Group                                            M. Chen
Request for Comments: 5316                                      R. Zhang
Category: Standards Track                   Huawei Technologies Co., Ltd
                                                                 X. Duan
                                                            China Mobile
                                                           December 2008

      ISIS Extensions in Support of Inter-Autonomous System (AS)
                   MPLS and GMPLS Traffic Engineering

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) 2008 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.

Abstract

   This document describes extensions to the ISIS (ISIS) protocol to
   support Multiprotocol Label Switching (MPLS) and Generalized MPLS
   (GMPLS) Traffic Engineering (TE) for multiple Autonomous Systems
   (ASes).  It defines ISIS-TE extensions for the flooding of TE
   information about inter-AS links, which can be used to perform inter-
   AS TE path computation.

   No support for flooding information from within one AS to another AS
   is proposed or defined in this document.

Chen, et al.                Standards Track                     [Page 1]
RFC 5316            ISIS Extensions for Inter-AS TE        December 2008

Table of Contents

   1. Introduction ....................................................2
      1.1. Conventions Used in This Document ..........................3
   2. Problem Statement ...............................................3
      2.1. A Note on Non-Objectives ...................................4
      2.2. Per-Domain Path Determination ..............................4
      2.3. Backward Recursive Path Computation ........................6
   3. Extensions to ISIS-TE ...........................................7
      3.1. Inter-AS Reachability TLV ..................................7
      3.2. TE Router ID ...............................................9
      3.3. Sub-TLV Detail .............................................9
           3.3.1. Remote AS Number Sub-TLV ............................9
           3.3.2. IPv4 Remote ASBR ID Sub-TLV ........................10
           3.3.3. IPv6 Remote ASBR ID Sub-TLV ........................11
           3.3.4. IPv4 TE Router ID sub-TLV ..........................11
           3.3.5. IPv6 TE Router ID sub-TLV ..........................12
   4. Procedure for Inter-AS TE Links ................................12
      4.1. Origin of Proxied TE Information ..........................14
   5. Security Considerations ........................................14
   6. IANA Considerations ............................................15
      6.1. Inter-AS Reachability TLV .................................15
      6.2. Sub-TLVs for the Inter-AS Reachability TLV ................15
      6.3. Sub-TLVs for the IS-IS Router Capability TLV ..............17
   7. Acknowledgments ................................................17
   8. References .....................................................17
      8.1. Normative References ......................................17
      8.2. Informative References ....................................17

1.  Introduction

   [ISIS-TE] defines extensions to the ISIS protocol [ISIS] to support
   intra-area Traffic Engineering (TE).  The extensions provide a way of
   encoding the TE information for TE-enabled links within the network
   (TE links) and flooding this information within an area.  The
   extended IS reachability TLV and traffic engineering router ID TLV,
   which are defined in [ISIS-TE], are used to carry such TE
   information.  The extended IS reachability TLV has several nested
   sub-TLVs that describe the TE attributes for a TE link.

   [ISIS-TE-V3] and [GMPLS-TE] define similar extensions to ISIS [ISIS]
   in support of IPv6 and GMPLS traffic engineering, respectively.

   Requirements for establishing Multiprotocol Label Switching (MPLS) TE
   Label Switched Paths (LSPs) that cross multiple Autonomous Systems
   (ASes) are described in [INTER-AS-TE-REQ].  As described in [INTER-

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