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Signalling Unnumbered Links in CR-LDP (Constraint-Routing Label Distribution Protocol) (RFC3480)

IP.com Disclosure Number: IPCOM000011470D
Original Publication Date: 2003-Feb-01
Included in the Prior Art Database: 2003-Feb-25
Document File: 9 page(s) / 17K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Kompella: AUTHOR [+3]

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 Constraint-Routing Label Distribution Protocol (CR-LDP), 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 16% of the total text.

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

Request for Comments: 3480� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Y. Rekhter

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

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � A. Kullberg

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � NetPlane Systems

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � February 2003

� � � � � � � � � � � � � � � � Signalling Unnumbered Links in CR-LDP

� � � � � � � � � � � (Constraint-Routing Label Distribution Protocol)

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 Constraint-Routing

� � Label Distribution Protocol (CR-LDP), 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, et al.� � � � � � � � � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3480� � � � � � � � Signalling Unnumbered Links in CR-LDP� � � � February 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 Objects.

� � This document proposes simple procedures and extensions that allow

� � CR-LDP signalling [CR-LDP] 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 unnum...