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Label Distribution Protocol (LDP) 'Typed Wildcard' Forward Equivalence Class (FEC)
RFC 5918

Internet Engineering Task Force (IETF)                          R. Asati
Request for Comments: 5918                                 Cisco Systems
Category: Standards Track                                       I. Minei
ISSN: 2070-1721                                         Juniper Networks
                                                               B. Thomas
                                                             August 2010

           Label Distribution Protocol (LDP) 'Typed Wildcard'
                    Forward Equivalence Class (FEC)

Abstract

   The Label Distribution Protocol (LDP) specification for the Wildcard
   Forward Equivalence Class (FEC) element has several limitations.
   This document addresses those limitations by defining a Typed
   Wildcard FEC Element and associated procedures.  In addition, it
   defines a new LDP capability to address backward compatibility.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5918.

Asati, et al.                Standards Track                    [Page 1]
RFC 5918                LDP 'Typed Wildcard' FEC             August 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Specification Language ..........................................4
   3. The Typed Wildcard FEC Element ..................................4
   4. Procedures for the Typed Wildcard FEC Element ...................5
   5. Typed Wildcard FEC Capability ...................................6
   6. Typed Wildcard FEC Element for Prefix FEC Element ...............7
   7. Typed Wildcard FEC Element for Host and Wildcard FEC Elements ...8
   8. IANA Considerations .............................................8
   9. Security Considerations .........................................8
   10. Acknowledgments ................................................9
   11. References .....................................................9
      11.1. Normative References ......................................9
      11.2. Informative References ....................................9

Asati, et al.                Standards Track                    [Page 2]
RFC 5918                LDP 'Typed Wildcard' FEC             August 2010

1.  Introduction

   LDP [RFC5036] distributes labels for Forwarding Equivalence Classes
   (FECs).  LDP uses FEC TLVs in LDP messages to specify FECs.  An LDP
   FEC TLV includes one or more FEC elements.  A FEC element includes a
   FEC type and an optional type-dependent value.

   RFC 5036 specifies two FEC types (Prefix and Wildcard), and other
   documents specify additional FEC types; e.g., see [RFC4447] and
   [MLDP].

   As specified by RFC 5036, the Wildcard FEC Element refers to all FECs
   relative to an optional constraint.  The only constraint RFC 5036
   specifies is one that limits the scope of the Wildcard FEC Element to

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