Linear Protection Switching in MPLS-TP
draft-zulr-mpls-tp-linear-protection-switching-07
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MPLS Working Group H. van Helvoort, Ed.
Internet-Draft Huawei Technologies
Intended status: Standards Track J. Ryoo, Ed.
Expires: November 07, 2013 ETRI
H. Zhang
Huawei Technologies
F. Huang
Alcatel-Lucent Shanghai Bell
H. Li
China Mobile
A. D'Alessandro
Telecom Italia
May 06, 2013
Linear Protection Switching in MPLS-TP
draft-zulr-mpls-tp-linear-protection-switching-07.txt
Abstract
This document specifies a linear protection switching mechanism for
MPLS-TP. This mechanism supports 1+1 unidirectional/bidirectional
protection switching and 1:1 bidirectional protection switching. It
is purely supported by MPLS-TP data plane, and can work without any
control plane.
This document is a product of a joint Internet Engineering Task Force
(IETF) / International Telecommunications Union Telecommunications
Standardization Sector (ITU-T) effort to include an MPLS Transport
Profile within the IETF MPLS and PWE3 architectures to support the
capabilities and functionalities of a packet transport network as
defined by the ITU-T.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
van Helvoort, et al. Expires November 07, 2013 [Page 1]
Internet-Draft Linear Protection Switching in MPLS-TP May 2013
This Internet-Draft will expire on November 07, 2013.
Copyright Notice
Copyright (c) 2013 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Linear protection switching overview . . . . . . . . . . . . 4
2.1. Protection architecture types . . . . . . . . . . . . . . 4
2.1.1. 1+1 architecture . . . . . . . . . . . . . . . . . . 4
2.1.2. 1:1 architecture . . . . . . . . . . . . . . . . . . 4
2.1.3. 1:n architecture . . . . . . . . . . . . . . . . . . 4
2.2. Protection switching type . . . . . . . . . . . . . . . . 5
2.3. Protection operation type . . . . . . . . . . . . . . . . 5
3. Protection switching trigger conditions . . . . . . . . . . . 5
3.1. Fault conditions . . . . . . . . . . . . . . . . . . . . 6
3.2. External commands . . . . . . . . . . . . . . . . . . . . 6
3.2.1. End-to-end commands . . . . . . . . . . . . . . . . . 6
3.2.2. Local commands . . . . . . . . . . . . . . . . . . . 7
4. Protection switching schemes . . . . . . . . . . . . . . . . 7
4.1. 1+1 unidirectional protection switching . . . . . . . . . 7
4.2. 1+1 bidirectional protection switching . . . . . . . . . 8
4.3. 1:1 bidirectional protection switching . . . . . . . . . 9
5. APS protocol . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1. APS PDU format . . . . . . . . . . . . . . . . . . . . . 10
5.2. APS transmission . . . . . . . . . . . . . . . . . . . . 13
5.3. Hold-off timer . . . . . . . . . . . . . . . . . . . . . 13
6. Protection switching logic . . . . . . . . . . . . . . . . . 14
7. Protection switching state transition table . . . . . . . . . 16
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