Network Working Group J. Dong
Internet-Draft M. Chen
Intended status: Standards Track Huawei Technologies
Expires: October 20, 2013 G. Mirsky
Ericsson
April 18, 2013
LDP Extensions for Lock Instruct and Loopback of Pseudowire in MPLS
Transport Profile
draft-dong-pwe3-mpls-tp-li-lb-03
Abstract
This document specifies extensions to the Label Distribution Protocol
(LDP) to support provisioning of lock instruct and loopback mechanism
for MPLS-TP Pseudowires.
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
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on October 20, 2013.
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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 . . . . . . . . . . . . . . . . . . . . . . 3
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 Lock Instruct
(LI) and Loopback (LB) mechanisms, and an LI OAM message can be used
for additional lock coordination between the MEPs. Management plane
based LI and LB is 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 to provision LI and LB functions. Unlike other OAM
mechanisms, LI and LB would modify the forwarding plane of a PW, thus
without the involvement of control plane this may result in
inconsistency between control plane and data plane. Besides, with
control plane based mechanism, it does not need to rely on the TTL
expiration to make the OAM requests reach particular MIP or MEP.
There are some existing control plane based OAM provisioning
mechanisms for MPLS-TP. For example, [I-D.ietf-pwe3-oam-config]
datatracker.ietf.org