Definition of P2MP PW TLV for Label Switched Path (LSP) Ping Mechanisms
RFC 8339
Internet Engineering Task Force (IETF) P. Jain, Ed.
Request for Comments: 8339 Cisco Systems, Inc.
Category: Standards Track S. Boutros
ISSN: 2070-1721 VMWare, Inc.
S. Aldrin
Google Inc.
March 2018
Definition of P2MP PW TLV for Label Switched Path (LSP) Ping Mechanisms
Abstract
Label Switched Path (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 (PWs) using LSP Ping.
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/rfc8339.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Jain, et al. Standards Track [Page 1]
RFC 8339 P2MP PW TLV for LSP Ping March 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Specification of Requirements . . . . . . . . . . . . . . 3
2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 4
3. Identifying a P2MP PW . . . . . . . . . . . . . . . . . . . . 5
3.1. P2MP Pseudowire Sub-TLV . . . . . . . . . . . . . . . . . 5
4. Encapsulation of OAM Ping Packets . . . . . . . . . . . . . . 6
5. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Controlling Echo Responses . . . . . . . . . . . . . . . . . 7
7. Security Considerations . . . . . . . . . . . . . . . . . . . 7
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
9.1. Normative References . . . . . . . . . . . . . . . . . . 8
9.2. Informative References . . . . . . . . . . . . . . . . . 9
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
Jain, et al. Standards Track [Page 2]
RFC 8339 P2MP PW TLV for LSP Ping March 2018
1. Introduction
A Point-to-Multipoint (P2MP) Pseudowire (PW) emulates the essential
attributes of a unidirectional P2MP Telecommunications service such
as P2MP ATM over a Public Switched Network (PSN). Requirements for
P2MP PWs are described in [RFC7338]. P2MP PWs are carried over a
P2MP MPLS LSP. The procedures for P2MP PW signaling using BGP are
described in [RFC7117]; LDP for single segment P2MP PWs is described
in [RFC8338]. Many P2MP PWs can share the same P2MP MPLS LSP; this
arrangement is called an "Aggregate P2MP Tree". An Aggregate P2MP
Tree requires an upstream-assigned label so that on the Leaf PE
(L-PE), the traffic can be associated with a Virtual Private Network
(VPN) or a Virtual Private LAN Service (VPLS) instance. When a P2MP
MPLS LSP carries only one VPN or VPLS service instance, the
arrangement is called an "Inclusive P2MP Tree". For an Inclusive
P2MP Tree, the P2MP MPLS LSP label itself can uniquely identify the
VPN or VPLS service being carried over the P2MP MPLS LSP. The P2MP
MPLS LSP can also be used in the Selective P2MP Tree arrangement to
carry multicast traffic. In a Selective P2MP Tree arrangement,
traffic to each multicast group in a VPN or VPLS instance is carried
by a separate unique P2MP LSP. In an Aggregate Selective P2MP Tree
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