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Link Management Protocol Behavior Negotiation and Configuration Modifications
RFC 6898

Internet Engineering Task Force (IETF)                             D. Li
Request for Comments: 6898                                        Huawei
Updates: 4204, 4207, 4209, 5818                            D. Ceccarelli
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                                L. Berger
                                                                    LabN
                                                              March 2013

           Link Management Protocol Behavior Negotiation and
                      Configuration Modifications

Abstract

   The Link Management Protocol (LMP) is used to coordinate the
   properties, use, and faults of data links in networks controlled by
   Generalized Multiprotocol Label Switching (GMPLS).  This document
   defines an extension to LMP to negotiate capabilities and indicate
   support for LMP extensions.  The defined extension is compatible with
   non-supporting implementations.

   This document updates RFC 4204, RFC 4207, RFC 4209, and RFC 5818.

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/rfc6898.

Li, et al.                   Standards Track                    [Page 1]
RFC 6898                LMP Behavior Negotiation              March 2013

Copyright Notice

   Copyright (c) 2013 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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................4
   2. LMP Message Modifications .......................................4
      2.1. Modified Message Formats ...................................4
      2.2. Processing .................................................5
   3. LMP Behavior Negotiation ........................................6
      3.1. BehaviorConfig C-Type Format ...............................6
      3.2. Processing .................................................7
   4. Backward Compatibility ..........................................7
   5. Security Considerations .........................................8
   6. IANA Considerations .............................................9
      6.1. New LMP Class Type .........................................9
      6.2. New Capabilities Registry ..................................9
   7. Normative References ...........................................10
   8. Acknowledgments ................................................10
   9. Contributors ...................................................10

Li, et al.                   Standards Track                    [Page 2]
RFC 6898                LMP Behavior Negotiation              March 2013

1.  Introduction

   The Link Management Protocol (LMP) [RFC4204] has been successfully
   deployed in networks controlled by Generalized Multiprotocol Label
   Switching (GMPLS).

   New LMP behaviors and protocol extensions have been introduced in a
   number of IETF documents, as set out later in this section.  It is
   likely that future extensions will be made to support additional
   functions.

   In a network, if one LMP-capable node supports a new behavior or
   protocol extension but its adjacent node does not, it is beneficial
   to have a protocol mechanism to discover the capabilities of peer
   nodes so that the right protocol extensions can be selected and the
   correct features can be enabled.  There are no such procedures
   defined in the base LMP specification [RFC4204]. [RFC4209] defined a
   specific mechanism to identify support for the functions specified in
   that document.  This document defines an LMP extension to support the

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