MPLS LSP PW status refresh reduction for Static Pseudowires
draft-ietf-pals-status-reduction-00

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Last updated 2016-06-09 (latest revision 2016-02-04)
Replaces draft-ietf-pwe3-status-reduction
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Internet Engineering Task Force                             Luca Martini
Internet Draft                                            George Swallow
Intended status: Standards Track                                   Cisco
Expires: August 2016
                                                        Elisa Bellagamba
                                                                Ericsson

                                                           February 2016

      MPLS LSP PW status refresh reduction for Static Pseudowires

                draft-ietf-pals-status-reduction-00.txt

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
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Abstract

   This document describes a method for generating an aggregated
   pseudowire status message on Multi-Protocol Label Switching (MPLS)
   network Label Switched Path (LSP).

   The method for transmitting the pseudowire (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 of multiple periodic status messages. This

Martini, et al.                                                 [Page 1]
Internet Draft  draft-ietf-pals-status-reduction-00.txt    February 2016

   is achieved by sending a single cumulative summary status
   verification message for all the PWs grouped in the same LSP.

Table of Contents

    1        Introduction  .........................................   3
    1.1      Requirements Language  ................................   3
    1.2      Terminology  ..........................................   3
    1.3      Notational Conventions in Backus-Naur Form  ...........   4
    2        PW status refresh reduction protocol  .................   4
    2.1      Protocol states  ......................................   4
    2.1.1    INACTIVE  .............................................   5
    2.1.2    STARTUP  ..............................................   5
    2.1.3    ACTIVE  ...............................................   5
    2.2      Timer value change transition procedure  ..............   5
    3        PW status refresh reduction procedure  ................   6
    4        PW status refresh reduction Message Encoding  .........   6
    5        PW status refresh reduction Control Messages  .........   9
    5.0.1    Notification message  .................................  10
    5.0.2    PW Configuration Message  .............................  10
    5.0.2.1  MPLS-TP Tunnel ID  ....................................  11
    5.0.2.2  PW ID configured List  ................................  11
    5.0.2.3  PW ID unconfigured List  ..............................  12
    6        PW provisioning verification procedure  ...............  13
    6.1      PW ID List advertising and processing  ................  13
    7        Security Considerations  ..............................  14
    8        IANA Considerations  ..................................  14
    8.1      PW Status Refresh Reduction Message Types  ............  14
    8.2      PW Configuration Message Sub-TLVs  ....................  14
    8.3      PW Status Refresh Reduction Notification Codes  .......  15
    9        References  ...........................................  15
    9.1      Normative References  .................................  15
    9.2      Informative References  ...............................  16
   10        Author's Addresses  ...................................  16

Martini, et al.                                                 [Page 2]
Internet Draft  draft-ietf-pals-status-reduction-00.txt    February 2016

1. Introduction

   When PWs use a Multi Protocol Label Switched (MPLS) network as the
   Packet Switched Network (PSN), they are setup according to [RFC4447]
   static configuration mode and the PW status information is propagated
   using the method described in [RFC6478]. There are 2 basic modes of
   operation described in [RFC6478] section 5.3: Periodic retransmission
   of non-zero status messages, and a simple acknowledge of PW status
   (sec 5.3.1 of [RFC6478]).  The LSP level protocol described below
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