RFC 3480 (rfc3480) - Page 1 of 8


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



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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
   [RFC 2119].

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


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