Dismiss
The IQ application will be briefly unavailable on Sunday, March 31st, starting at 10:00am ET. Access will be restored as quickly as possible.
Browse Prior Art Database

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: 2019-Feb-14
Document File: 11 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Kompella: AUTHOR [+1]

Related Documents

10.17487/RFC4205: DOI

Abstract

This document specifies encoding of extensions to the IS-IS routing protocol in support of Generalized Multi-Protocol Label Switching (GMPLS). This memo provides information for the Internet community.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 17% 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. The value field of this sub-TLV contains four octets of Link Local Identifier followed by four octets of Link Remote Identifier (see Section "Support for unnumbered links" of [GMPLS-ROUTING]). If the Link Remote Identifier is unknown, it is set to 0.

The following illustrates encoding of the Value field of the Link Local/Remote Identifiers sub-TLV.

0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Remote Identifier | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

The Link Local/Remote Identifiers sub-TLV MUST NOT occur more than once within the extended IS reachability TLV. If the Link Local/Remote Identifiers sub-TLV occurs more than once within the extended IS reachability TLV, the receiver S...

Processing...
Loading...