LDP Extensions for Pseudowire Binding to Label Switched Path (LSP) Tunnels
RFC 7965
Internet Engineering Task Force (IETF) M. Chen
Request for Comments: 7965 W. Cao
Category: Standards Track Huawei
ISSN: 2070-1721 A. Takacs
Ericsson
P. Pan
August 2016
LDP Extensions for Pseudowire
Binding to Label Switched Path (LSP) Tunnels
Abstract
Many transport services require that user traffic, in the form of
Pseudowires (PWs), be delivered via either a single co-routed
bidirectional tunnel or two unidirectional tunnels that share the
same routes. This document defines an optional extension to the
Label Distribution Protocol (LDP) that enables the binding between
PWs and the underlying Traffic Engineering (TE) tunnels. The
extension applies to both single-segment and multi-segment PWs.
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
http://www.rfc-editor.org/info/rfc7965.
Chen, et al. Standards Track [Page 1]
RFC 7965 Explicit PW-to-LSP Tunnels Binding August 2016
Copyright Notice
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document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 4
3. LDP Extensions . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. PSN Tunnel Binding TLV . . . . . . . . . . . . . . . . . 5
3.1.1. PSN Tunnel Sub-TLV . . . . . . . . . . . . . . . . . 7
4. Theory of Operation . . . . . . . . . . . . . . . . . . . . . 8
5. PSN Binding Operation for SS-PW . . . . . . . . . . . . . . . 9
6. PSN Binding Operation for MS-PW . . . . . . . . . . . . . . . 11
7. PSN Tunnel Select Considerations . . . . . . . . . . . . . . 13
8. Security Considerations . . . . . . . . . . . . . . . . . . . 13
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
9.1. LDP TLV Types . . . . . . . . . . . . . . . . . . . . . . 13
9.1.1. PSN Tunnel Sub-TLVs . . . . . . . . . . . . . . . . . 14
9.2. LDP Status Codes . . . . . . . . . . . . . . . . . . . . 14
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
10.1. Normative References . . . . . . . . . . . . . . . . . . 14
10.2. Informative References . . . . . . . . . . . . . . . . . 15
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
Chen, et al. Standards Track [Page 2]
RFC 7965 Explicit PW-to-LSP Tunnels Binding August 2016
1. Introduction
Pseudo Wire Emulation Edge-to-Edge (PWE3) [RFC3985] is a mechanism to
emulate Layer 2 services, such as Ethernet Point-to-Point circuits.
Such services are emulated between two Attachment Circuits, and the
Pseudowire-encapsulated Layer 2 service payload is transported via
Packet Switching Network (PSN) tunnels between Provider Edges (PEs).
PWE3 typically uses the Label Distribution Protocol (LDP) [RFC5036]
or Resource Reservation Protocol - Traffic Engineering (RSVP-TE)
[RFC3209] Label Switched Paths (LSPs) as PSN tunnels. The PEs select
and bind the Pseudowires to PSN tunnels independently. Today, there
is no standardized protocol-based provisioning mechanism to associate
PWs with PSN tunnels; such associations must be managed via
provisioning or other private methods.
PW-to-PSN Tunnel Binding has become increasingly common and important
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