Network Working Group Parag Jain, Ed.
Internet Draft Sami Boutros
Intended status: Standards Track Cisco Systems, Inc.
Expires: January 10, 2014
July 9, 2013
Definition of P2MP PW TLV for LSP-Ping Mechanisms
LSP-Ping is a widely deployed Operation, Administration, and
Maintenance (OAM) mechanism in MPLS networks. This document
describes a mechanism to verify connectivity of Point-to-Multipoint
(P2MP) Pseudowires (PW) using LSP Ping.
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Table of Contents
1. Introduction 2
2. Conventions used in this document 3
3. Terminology 3
4. Identifying a P2MP PW 3
4.1. FEC 130 Pseudowire Sub-TLV 4
5. Operations 4
6. Echo Reply using Downstream Assigned Label 6
7. Controlling Echo Responses 6
8. Security Considerations 6
9. IANA Considerations 6
10. References 6
10.1. Normative References 6
10.2. Informative References 7
11. Acknowledgments 7
A Point-to-Multipoint (P2MP) Pseudowire (PW) emulates the essential
attributes of a unidirectional P2MP Telecommunications service such
as P2MP ATM over PSN. Requirements for P2MP PW are described in
[PPWREQ]. P2MP PWs are carried over P2MP MPLS LSP. The Procedure for
P2MP PW signaling using LDP for single segment P2MP PWs are
described in [PPWPWE3]. Many P2MP PWs can share the same P2MP MPLS
LSP and this arrangement is called Aggregate P-tree. The aggregate
P2MP trees require an upstream assigned label so that on the tail of
the P2MP LSP, the traffic can be associated with a VPN or a VPLS
instance. When a P2MP MPLS LSP carries only one VPN or VPLS service
instance, the arrangement is called Inclusive P-Tree. For Inclusive
P-Trees, P2MP MPLS LSP label itself can uniquely identify the VPN or
VPLS service being carried over P2MP MPLS LSP. The P2MP MPLS LSP can
also be used in Selective P-Tree arrangement for carrying multicast
traffic. In a Selective P-Tree arrangement, traffic to each