MPLS Label Switched Path (LSP) Pseudowire (PW) Status Refresh Reduction for Static PWs
RFC 8237

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Internet Engineering Task Force (IETF)                        L. Martini
Request for Comments: 8237                                   Monoski LLC
Category: Standards Track                                     G. Swallow
ISSN: 2070-1721                                                     SETC
                                                           E. Bellagamba
                                                                Ericsson
                                                            October 2017

             MPLS Label Switched Path (LSP) Pseudowire (PW)
                Status Refresh Reduction for Static PWs

Abstract

   This document describes a method for generating an aggregated
   pseudowire (PW) status message transmitted for a statically
   configured PW on a Multiprotocol Label Switching (MPLS) Label
   Switched Path (LSP) to indicate the status of one or more PWs carried
   on the LSP.

   The method for transmitting the PW status information is not new;
   however, this protocol extension allows a Service Provider (SP) to
   reliably monitor the individual PW status while not overwhelming the
   network with multiple periodic status messages.  This is achieved by
   sending a single cumulative summary status verification message for
   all the PWs grouped in the same LSP.

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 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8237.

Martini, et al.              Standards Track                    [Page 1]
RFC 8237          MPLS LSP PW Status Refresh Reduction      October 2017

Copyright Notice

   Copyright (c) 2017 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
   (https://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.

Martini, et al.              Standards Track                    [Page 2]
RFC 8237          MPLS LSP PW Status Refresh Reduction      October 2017

Table of Contents

   1. Introduction ....................................................3
      1.1. Requirements Language ......................................4
      1.2. Terminology ................................................4
      1.3. Notational Conventions .....................................5
   2. PW Status Refresh Reduction Protocol ............................5
      2.1. Protocol States ............................................5
           2.1.1. INACTIVE ............................................5
           2.1.2. STARTUP .............................................6
           2.1.3. ACTIVE ..............................................6
      2.2. Timer Value Change Transition Procedure ....................6
   3. PW Status Refresh Reduction Procedure ...........................7
   4. PW Status Refresh Reduction Message Encoding ....................8
   5. PW Status Refresh Reduction Control Messages ...................11
      5.1. Notification Message ......................................12
      5.2. PW Configuration Message ..................................12
           5.2.1. MPLS-TP Tunnel ID ..................................13
           5.2.2. PW ID Configured List ..............................14
           5.2.3. PW ID Unconfigured List ............................15
   6. PW Provisioning Verification Procedure .........................15
      6.1. PW ID List Advertising and Processing .....................16
   7. Security Considerations ........................................16
   8. IANA Considerations ............................................17
      8.1. PW Status Refresh Reduction Message Types .................17
      8.2. PW Configuration Message Sub-TLVs .........................17
      8.3. PW Status Refresh Reduction Notification Codes ............18
      8.4. PW Status Refresh Reduction Message Flags .................18
      8.5. G-ACh Registry Allocation .................................19
      8.6. Guidance for Designated Experts ...........................19