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Signalling Unnumbered Links in Resource ReSerVation Protocol - Traffic Engineering (RSVP-TE) (RFC3477)

IP.com Disclosure Number: IPCOM000011393D
Original Publication Date: 2003-Jan-01
Included in the Prior Art Database: 2003-Feb-18
Document File: 10 page(s) / 20K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Kompella: AUTHOR [+2]

Abstract

Current signalling used by Multi-Protocol Label Switching Traffic Engineering (MPLS TE) does not provide support for unnumbered links. This document defines procedures and extensions to Resource ReSerVation Protocol (RSVP) for Label Switched Path (LSP) Tunnels (RSVP-TE), one of the MPLS TE signalling protocols, that are needed in order to support unnumbered links.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � K. Kompella

Request for Comments: 3477� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Y. Rekhter

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Juniper Networks

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � January 2003

� � � � Signalling Unnumbered Links in Resource ReSerVation Protocol -

� � � � � � � � � � � � � � � � � � � � Traffic Engineering (RSVP-TE)

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) The Internet Society (2003).� All Rights Reserved.

Abstract

� � Current signalling used by Multi-Protocol Label Switching Traffic

� � Engineering (MPLS TE) does not provide support for unnumbered links.

� � This document defines procedures and extensions to Resource

� � ReSerVation Protocol (RSVP) for Label Switched Path (LSP) Tunnels

� � (RSVP-TE), one of the MPLS TE signalling protocols, that are needed

� � in order to support unnumbered links.

Specification of Requirements

� � 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 BCP 14, RFC 2119

� � [RFC2119].

1. Overview

� � Supporting MPLS TE over unnumbered links (i.e., links that do not

� � have IP addresses) involves two components: (a) the ability to carry

� � (TE) information about unnumbered links in IGP TE extensions (ISIS or

� � OSPF), and (b) the ability to specify unnumbered links in MPLS TE

� � signalling.� The former is covered in [GMPLS-ISIS, GMPLS-OSPF].� The

� � focus of this document is on the latter.

Kompella & Rekhter� � � � � � � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3477� � � � � � � � Signalling Unnumbered Links in RSVP-TE� � � � January 2003

� � Current signalling used by MPLS TE does not provide support for

� � unnumbered links because the current signalling does not provide a

� � way to indicate an unnumbered link in its Explicit Route and Record

� � Route Objects.� This document proposes simple procedures and

� � extensions that allow RSVP-TE signalling [RFC3473] to be used with

� � unnumbered links.

2. Link Identifiers

� � An unnumbered link has to be a point-to-point link.� An LSR at each

� � end of an unnumbered link assigns an identifier to that link.� This

� � identifier is a non-zero 32-bit number that is unique within the

� � scope of the LSR that assigns it.� If one is using OSPF or ISIS as

� � the I...