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Intermediate System to Intermediate System (IS-IS) Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS) (RFC4205)

IP.com Disclosure Number: IPCOM000130545D
Original Publication Date: 2005-Oct-01
Included in the Prior Art Database: 2005-Oct-26
Document File: 12 page(s) / 22K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Kompella: AUTHOR [+4]

Abstract

This document specifies encoding of extensions to the IS-IS routing protocol in support of Generalized Multi-Protocol Label Switching (GMPLS).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 12% of the total text.

Network Working Group                                   K. Kompella, Ed.
Request for Comments: 4205                               Y. Rekhter, Ed.
Updates: 3784                                           Juniper Networks
Category: Informational                                     October 2005


     Intermediate System to Intermediate System (IS-IS) Extensions
    in Support of Generalized Multi-Protocol Label Switching (GMPLS)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document specifies encoding of extensions to the IS-IS routing
   protocol in support of Generalized Multi-Protocol Label Switching
   (GMPLS).

1.  Introduction

   This document specifies extensions to the IS-IS routing protocol in
   support of carrying link state information for Generalized Multi-
   Protocol Label Switching (GMPLS).  The set of required enhancements
   to IS-IS are outlined in [GMPLS-ROUTING].  Support for unnumbered
   interfaces assumes support for the "Point-to-Point Three-Way
   Adjacency" IS-IS Option type [ISIS-3way].

   In this section we define the enhancements to the Traffic Engineering
   (TE) properties of GMPLS TE links that can be announced in IS-IS Link
   State Protocol Data Units.

   In this document, we enhance the sub-TLVs for the extended IS
   reachability TLV (see [ISIS-TE]) in support of GMPLS.  Specifically,
   we add the following sub-TLVs:

      Sub-TLV Type      Length      Name
                 4           8      Link Local/Remote Identifiers
                20           2      Link Protection Type
                21      variable    Interface Switching Capability
                                    Descriptor


Kompella & Rekhter           Informational                      [Page 1]
RFC 4205               IS-IS Extensions for MPLS            October 2005


   We further add one new TLV to the TE TLVs:

          TLV Type      Length    Name
               138      variable  Shared Risk Link Group

   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].

1.1.  Link Local/Remote Identifiers

   A Link Local Interface Identifiers is a sub-TLV of the extended IS
   reachability TLV.  The type of this sub-TLV is 4, and length is eight
   octets. ...