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LDP Extensions for Lock Instruct and Loopback of Pseudowire in MPLS Transport Profile
draft-dong-pwe3-mpls-tp-li-lb-06

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Last updated: 2014-04-21
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Network Working Group                                            J. Dong
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: October 23, 2014                                      G. Mirsky
                                                                Ericsson
                                                          April 21, 2014

  LDP Extensions for Lock Instruct and Loopback of Pseudowire in MPLS
                           Transport Profile
                    draft-dong-pwe3-mpls-tp-li-lb-06

Abstract

   This document specifies extensions to the Label Distribution Protocol
   (LDP) to support the provisioning of lock instruct (LI) and loopback
   (LB) mechanisms for MPLS Transport Profile (MPLS-TP) pseudowires
   (PWs).

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on October 23, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dong, et al.            Expires October 23, 2014                [Page 1]
Internet-Draft         LDP Extensions for PW LI&LB            April 2014

   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  LDP Extensions  . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Extensions to MPLS-TP PW OAM Administration TLV . . . . .   3
     2.2.  Extensions to PW Status TLV . . . . . . . . . . . . . . .   3
   3.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Lock Instruct . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Loopback  . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The requirements for Lock Instruct (LI) and Loopback (LB) are
   specified in [RFC5860], and the framework of LI and LB is specified
   in [RFC6371].  [RFC6435] defines management plane based LI and LB
   mechanisms, and LI OAM message is defined for additional lock
   coordination between the Maintenance Entity Group End Points (MEPs).
   Management plane based LI and LB are suitable for scenarios where
   dynamic control plane is not available.

   When a dynamic control plane is used for establishing MPLS-TP
   pseudowires (PWs), it's natural to use and extend the control plane
   protocol for the provisioning of LI and LB functions.  Unlike other
   OAM mechanisms, LI and LB would modify the forwarding plane of PW,
   thus without the involvement of control plane this may result in
   inconsistency between control plane and data plane.  Besides, control
   plane based mechanism does not need to rely on the TTL expiration to
   make the OAM requests reach particular Maintenance Entity Group
   Intermediate Point (MIP) or MEP.

   There are some existing control plane based OAM provisioning

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