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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...