Dual-Homing Protection for MPLS and the MPLS Transport Profile (MPLS-TP) Pseudowires
RFC 8184
Internet Engineering Task Force (IETF) W. Cheng
Request for Comments: 8184 L. Wang
Category: Informational H. Li
ISSN: 2070-1721 China Mobile
S. Davari
Broadcom Corporation
J. Dong
Huawei Technologies
June 2017
Dual-Homing Protection for
MPLS and the MPLS Transport Profile (MPLS-TP) Pseudowires
Abstract
This document describes a framework and several scenarios for a
pseudowire (PW) dual-homing local protection mechanism that avoids
unnecessary switchovers and does not depend on whether a control
plane is used. A Dual-Node Interconnection (DNI) PW is used to carry
traffic between the dual-homing Provider Edge (PE) nodes when a
failure occurs in one of the Attachment Circuits (AC) or PWs. This
PW dual-homing local protection mechanism is complementary to
existing PW protection mechanisms.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
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). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see 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/rfc8184.
Cheng, et al. Informational [Page 1]
RFC 8184 Dual-Homing PW Protection June 2017
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Reference Models of Dual-Homing Local Protection . . . . . . 4
2.1. PE Architecture . . . . . . . . . . . . . . . . . . . . . 4
2.2. Dual-Homing Local Protection Reference Scenarios . . . . 5
2.2.1. One-Side Dual-Homing Protection . . . . . . . . . . . 5
2.2.2. Two-Side Dual-Homing Protection . . . . . . . . . . . 6
3. Generic Dual-Homing PW Protection Mechanism . . . . . . . . . 8
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1. Normative References . . . . . . . . . . . . . . . . . . 9
6.2. Informative References . . . . . . . . . . . . . . . . . 9
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
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RFC 8184 Dual-Homing PW Protection June 2017
1. Introduction
[RFC6372] and [RFC6378] describe the framework and mechanism of MPLS
Transport Profile (MPLS-TP) linear protection, which can provide
protection for the MPLS Label Switched Path (LSP) or pseudowire (PW)
between the edge nodes. This mechanism does not protect against
failure of the Attachment Circuit (AC) or the Provider Edge (PE)
node. [RFC6718] and [RFC6870] describe the framework and mechanism
for PW redundancy to provide protection against AC or PE node
failure. The PW redundancy mechanism is based on the signaling of
the Label Distribution Protocol (LDP), which is applicable to PWs
with a dynamic control plane. [RFC8104] describes a fast local
repair mechanism for PW egress endpoint failures, which is based on
PW redundancy, upstream label assignment, and context-specific label
switching. The mechanism defined in [RFC8104] is only applicable to
PWs with a dynamic control plane.
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