Data Channel Status Confirmation Extensions for the Link Management Protocol
RFC 5818

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Internet Engineering Task Force (IETF)                             D. Li
Request for Comments: 5818                                         H. Xu
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                              S. Bardalai
                                                                 Fujitsu
                                                               J. Meuric
                                                          France Telecom
                                                             D. Caviglia
                                                                Ericsson
                                                              April 2010

              Data Channel Status Confirmation Extensions
                    for the Link Management Protocol

Abstract

   This document defines simple additions to the Link Management
   Protocol (LMP) to provide a control plane tool that can assist in the
   location of stranded resources by allowing adjacent Label-Switching
   Routers (LSRs) to confirm data channel statuses and provide triggers
   for notifying the management plane if any discrepancies are found.
   As LMP is already used to verify data plane connectivity, it is
   considered to be an appropriate candidate to support this feature.

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/rfc5818.

Li et al.                    Standards Track                    [Page 1]
RFC 5818              Data Channel Statuses and LMP           April 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
   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
   2. Specification of Requirements ...................................4
   3. Problem Explanation .............................................4
      3.1. Mismatch Caused by Manual Configuration ....................4
      3.2. Mismatch Caused by LSP Deletion ............................5
      3.3. Failed Resources ...........................................6
   4. Motivation ......................................................6
   5. Extensions to LMP ...............................................7
      5.1. Confirm Data Channel Status Messages .......................7
           5.1.1. ConfirmDataChannelStatus Messages ...................8
           5.1.2. ConfirmDataChannelStatusAck Messages ................8
           5.1.3. ConfirmDataChannelStatusNack Messages ...............8
      5.2. Data Channel Status Subobject ..............................9
      5.3. Message Construction ......................................10
      5.4. Backward Compatibility ....................................10
   6. Procedures .....................................................11
   7. Security Considerations ........................................12
   8. IANA Considerations ............................................12
      8.1. LMP Message Types .........................................12
      8.2. LMP Data Link Object Subobject ............................13
      8.3. LMP Error_Code Class Type .................................13
   9. Acknowledgments ................................................13
   10. References ....................................................13
      10.1. Normative References .....................................13
      10.2. Informative References ...................................14
   Contributor's Address .............................................14

Li et al.                    Standards Track                    [Page 2]
RFC 5818              Data Channel Statuses and LMP           April 2010

1.  Introduction

   Generalized Multiprotocol Label Switching (GMPLS) networks are
   constructed from Traffic Engineering (TE) links connecting Label