Redundancy Mechanism for Inter-domain VPLS Service
RFC 7309
Internet Engineering Task Force (IETF) Z. Liu
Request for Comments: 7309 China Telecom
Category: Standards Track L. Jin
ISSN: 2070-1721
R. Chen
ZTE Corporation
D. Cai
S. Salam
Cisco
July 2014
Redundancy Mechanism for Inter-domain VPLS Service
Abstract
In many existing Virtual Private LAN Service (VPLS) inter-domain
deployments (based on RFC 4762), pseudowire (PW) connectivity offers
no Provider Edge (PE) node redundancy, or offers PE node redundancy
with only a single domain. This deployment approach incurs a high
risk of service interruption, since at least one domain will not
offer PE node redundancy. This document describes an inter-domain
VPLS solution that provides PE node redundancy across domains.
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 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/rfc7309.
Liu, et al. Standards Track [Page 1]
RFC 7309 Redundancy for VPLS Inter-domain July 2014
Copyright Notice
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This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 3
3. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Network Use Case . . . . . . . . . . . . . . . . . . . . . . 4
5. PW Redundancy Application Procedure for Inter-domain
Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1. ICCP Switchover Condition . . . . . . . . . . . . . . . . 6
5.1.1. Inter-domain PW Failure . . . . . . . . . . . . . . . 6
5.1.2. PE Node Isolation . . . . . . . . . . . . . . . . . . 6
5.1.3. PE Node Failure . . . . . . . . . . . . . . . . . . . 6
5.2. Inter-domain Redundancy with Two PWs . . . . . . . . . . 6
5.3. Inter-domain Redundancy with Four PWs . . . . . . . . . . 7
6. Management Considerations . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 10
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Normative references . . . . . . . . . . . . . . . . . . 10
10.2. Informative references . . . . . . . . . . . . . . . . . 10
Liu, et al. Standards Track [Page 2]
RFC 7309 Redundancy for VPLS Inter-domain July 2014
1. Introduction
In many existing Virtual Private LAN Service (VPLS) deployments based
on [RFC4762], pseudowire (PW) connectivity offers no Provider Edge
(PE) node redundancy, or offers PE node redundancy with only a single
domain. This deployment approach incurs a high risk of service
interruption, since at least one domain will not offer PE node
redundancy. This document describes an inter-domain VPLS solution
that provides PE node redundancy across domains. The redundancy
mechanism will provide PE node redundancy and link redundancy in both
domains. The PE throughout the document refers to a routing and
bridging capable PE defined in [RFC4762], Section 10. The domain in
this document refers to an autonomous system (AS), or other
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