Intermediate System to Intermediate System (IS-IS) Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS) (RFC4205)
Original Publication Date: 2005-Oct-01
Included in the Prior Art Database: 2005-Oct-26
Internet Society Requests For Comment (RFCs)
K. Kompella: AUTHOR [+3]
This document specifies encoding of extensions to the IS-IS routing protocol in support of Generalized Multi-Protocol Label Switching (GMPLS).
Network Working Group K. Kompella,
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
provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright (C) The Internet Society (2005).
specifies encoding of extensions to the IS-IS routing
protocol in support of Generalized Multi-Protocol Label Switching
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.
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:
Type Length Name
4 8 Link Local/Remote Identifiers
20 2 Link Protection Type
21 variable Interface Switching Capability
Kompella & Rekhter Informational [Page 1]
RFC 4205 IS-IS Extensions for MPLS October 2005
We further add one new TLV to the TE TLVs:
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