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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...