Independent Submission H. van Helvoort, Ed.
Request for Comments: 7347 Huawei Technologies
Category: Informational J. Ryoo, Ed.
ISSN: 2070-1721 ETRI
H. Zhang
Huawei Technologies
F. Huang
Philips
H. Li
China Mobile
A. D'Alessandro
Telecom Italia
September 2014
Pre-standard Linear Protection Switching in
MPLS Transport Profile (MPLS-TP)
Abstract
The IETF Standards Track solution for MPLS Transport Profile
(MPLS-TP) Linear Protection is provided in RFCs 6378, 7271, and 7324.
This document describes the pre-standard implementation of MPLS-TP
Linear Protection that has been deployed by several network operators
using equipment from multiple vendors. At the time of publication,
these pre-standard implementations were still in operation carrying
live traffic.
The specified mechanism supports 1+1 unidirectional/bidirectional
protection switching and 1:1 bidirectional protection switching. It
is purely supported by the MPLS-TP data plane and can work without
any control plane.
van Helvoort, et al. Informational [Page 1]RFC 7347 Pre-standard MPLS-TP Lin. Prot. Switching September 2014Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This is a contribution to the RFC Series, independently of any other
RFC stream. The RFC Editor has chosen to publish this document at
its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
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/rfc7347.
Copyright Notice
Copyright (c) 2014 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
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van Helvoort, et al. Informational [Page 2]RFC 7347 Pre-standard MPLS-TP Lin. Prot. Switching September 2014Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Conventions Used in This Document . . . . . . . . . . . . . . 5
3. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Linear Protection-Switching Overview . . . . . . . . . . . . 6
4.1. Protection Architecture Types . . . . . . . . . . . . . . 6
4.1.1. 1+1 Architecture . . . . . . . . . . . . . . . . . . 6
4.1.2. 1:1 Architecture . . . . . . . . . . . . . . . . . . 6
4.1.3. 1:n Architecture . . . . . . . . . . . . . . . . . . 7
4.2. Protection Switching Type . . . . . . . . . . . . . . . . 7
4.3. Protection Operation Type . . . . . . . . . . . . . . . . 7
5. Protection-Switching Trigger Conditions . . . . . . . . . . . 8
5.1. Fault Conditions . . . . . . . . . . . . . . . . . . . . 8
5.2. External Commands . . . . . . . . . . . . . . . . . . . . 8
5.2.1. End-to-End Commands . . . . . . . . . . . . . . . . . 8
5.2.2. Local Commands . . . . . . . . . . . . . . . . . . . 9
6. Protection-Switching Schemes . . . . . . . . . . . . . . . . 10
6.1. 1+1 Unidirectional Protection Switching . . . . . . . . . 10
6.2. 1+1 Bidirectional Protection Switching . . . . . . . . . 11
6.3. 1:1 Bidirectional Protection Switching . . . . . . . . . 12
7. APS Protocol . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1. APS PDU Format . . . . . . . . . . . . . . . . . . . . . 13
7.2. APS Transmission . . . . . . . . . . . . . . . . . . . . 16
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