Dual-Homing Coordination for MPLS Transport Profile (MPLS-TP) Pseudowires Protection
RFC 8185
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Type |
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RFC - Proposed Standard
(June 2017; No errata)
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Last updated |
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2017-06-26
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Replaces |
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draft-cheng-pwe3-mpls-tp-dual-homing-coordination
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Stream |
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IETF
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plain text
pdf
html
bibtex
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Reviews |
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Stewart Bryant
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Shepherd write-up |
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Show
(last changed 2016-08-23)
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| IESG |
IESG state |
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RFC 8185 (Proposed Standard)
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Consensus Boilerplate |
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Yes
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Telechat date |
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Responsible AD |
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Deborah Brungard
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Send notices to |
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"Stewart Bryant" <stewart.bryant@gmail.com>
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| IANA |
IANA review state |
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Version Changed - Review Needed
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IANA action state |
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RFC-Ed-Ack
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Internet Engineering Task Force (IETF) W. Cheng
Request for Comments: 8185 L. Wang
Category: Standards Track H. Li
ISSN: 2070-1721 China Mobile
J. Dong
Huawei Technologies
A. D'Alessandro
Telecom Italia
June 2017
Dual-Homing Coordination
for MPLS Transport Profile (MPLS-TP) Pseudowires Protection
Abstract
In some scenarios, MPLS Transport Profile (MPLS-TP) pseudowires (PWs)
(RFC 5921) may be statically configured when a dynamic control plane
is not available. A fast protection mechanism for MPLS-TP PWs is
needed to protect against the failure of an Attachment Circuit (AC),
the failure of a Provider Edge (PE), or a failure in the Packet
Switched Network (PSN). The framework and typical scenarios of dual-
homing PW local protection are described in RFC 8184. This document
proposes a dual-homing coordination mechanism for MPLS-TP PWs that is
used for state exchange and switchover coordination between the dual-
homing PEs for dual-homing PW local protection.
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/rfc8185.
Cheng, et al. Standards Track [Page 1]
RFC 8185 Dual-Homing Coordination for MPLS-TP PWs June 2017
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Overview of the Proposed Solution . . . . . . . . . . . . . . 4
4. Protocol Extensions for Dual-Homing MPLS-TP PW Protection . . 5
4.1. Information Exchange Between Dual-Homing PEs . . . . . . 5
4.2. Protection Procedures . . . . . . . . . . . . . . . . . . 9
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
6. Security Considerations . . . . . . . . . . . . . . . . . . . 13
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1. Normative References . . . . . . . . . . . . . . . . . . 14
7.2. Informative References . . . . . . . . . . . . . . . . . 15
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17
Cheng, et al. Standards Track [Page 2]
RFC 8185 Dual-Homing Coordination for MPLS-TP PWs June 2017
1. Introduction
[RFC6372], [RFC6378], and [RFC7771] describe the framework and
mechanism of MPLS Transport Profile (MPLS-TP) linear protection,
which can provide protection for the MPLS Label Switched Path (LSP)
and pseudowires (PWs) between the edge nodes. These mechanisms
cannot protect against the failure of the Attachment Circuit (AC) or
the edge nodes. [RFC6718] and [RFC6870] specify the PW redundancy
framework and mechanism for protecting the AC or edge node against
failure by adding one or more edge nodes, but it requires PW
switchover in case of an AC failure; also, PW redundancy relies on
Packet Switched Network (PSN) protection mechanisms to protect
against the failure of PW.
In some scenarios such as mobile backhauling, the MPLS PWs are
provisioned with dual-homing topology in which at least the Customer
Edge (CE) node on one side is dual-homed to two Provider Edge (PE)
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