Applicability of MPLS Transport Profile for Ring Topologies
RFC 6974
Internet Engineering Task Force (IETF) Y. Weingarten
Request for Comments: 6974
Category: Informational S. Bryant
ISSN: 2070-1721 Cisco Systems
D. Ceccarelli
D. Caviglia
F. Fondelli
Ericsson
M. Corsi
Altran
B. Wu
ZTE Corporation
X. Dai
July 2013
Applicability of MPLS Transport Profile for Ring Topologies
Abstract
This document presents an applicability of existing MPLS protection
mechanisms, both local and end-to-end, to the MPLS Transport Profile
(MPLS-TP) in ring topologies. This document does not propose any new
mechanisms or protocols. Requirements for MPLS-TP protection
especially for protection in ring topologies are discussed in
"Requirements of an MPLS Transport Profile" (RFC 5654) and "MPLS
Transport Profile (MPLS-TP) Survivability Framework" (RFC 6372).
This document discusses how most of the requirements are met by
applying linear protection as defined in RFC 6378 in a ring topology.
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 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/rfc6974.
Weingarten, et al. Informational [Page 1]
RFC 6974 MPLS-TP RP July 2013
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Problem Statement . . . . . . . . . . . . . . . . . . . . 3
1.2. Scope of the Document . . . . . . . . . . . . . . . . . . 4
1.3. Terminology and Notation . . . . . . . . . . . . . . . . . 5
2. Point-to-Point (P2P) Ring Protection . . . . . . . . . . . . . 6
2.1. Wrapping . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2. Steering . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3. SPME for P2P Protection of a Ring Topology . . . . . . . . 10
2.3.1. Path SPME for Steering . . . . . . . . . . . . . . . . 11
2.3.2. Wrapping Link Protection with Segment-Based SPME . . . 12
2.3.3. Wrapping Node Protection . . . . . . . . . . . . . . . 13
2.3.4. Wrapping for Link and Node Protection . . . . . . . . 14
2.4. Analysis of P2P Protection . . . . . . . . . . . . . . . . 15
2.4.1. Recommendations for Protection of P2P Paths
Traversing a Ring . . . . . . . . . . . . . . . . . . 16
3. Point-to-Multipoint Protection . . . . . . . . . . . . . . . . 17
3.1. Wrapping for P2MP LSPs . . . . . . . . . . . . . . . . . . 17
3.1.1. Comparison of Wrapping and ROM-Wrapping . . . . . . . 19
3.1.2. Multiple Failures Comparison . . . . . . . . . . . . . 20
3.2. Steering for P2MP Paths . . . . . . . . . . . . . . . . . 21
3.2.1. Context Labels . . . . . . . . . . . . . . . . . . . . 21
3.2.2. Walk-Through Using Context Labels . . . . . . . . . . 23
4. Coordination Protocol . . . . . . . . . . . . . . . . . . . . 26
5. Conclusions and Recommendations . . . . . . . . . . . . . . . 26
6. Security Considerations . . . . . . . . . . . . . . . . . . . 27
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