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Pseudowire (PW) Endpoint Fast Failure Protection (RFC8104) Disclosure Number: IPCOM000249671D
Original Publication Date: 2017-Mar-01
Included in the Prior Art Database: 2017-Mar-16
Document File: 86 page(s) / 95K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Y. Shen: AUTHOR [+3]


Per [RFC3985], [RFC8077], and [RFC5659], a pseudowire (PW) or PW segment can be thought of as a connection between a pair of forwarders hosted by two PEs, carrying an emulated Layer 2 service over a packet switched network (PSN). In the single-segment PW (SS-PW) case, a forwarder binds a PW to an attachment circuit (AC). In the multi-segment PW (MS-PW) case, a forwarder on a terminating PE (T-PE) binds a PW segment to an AC, while a forwarder on a switching PE (S-PE) binds one PW segment to another PW segment. In each direction between the PEs, PW packets are transported by a PSN tunnel, which is also called a transport tunnel.

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Internet Engineering Task Force (IETF)                           Y. Shen Request for Comments: 8104                              Juniper Networks Category: Standards Track                                    R. Aggarwal ISSN: 2070-1721                                             Arktan, Inc.                                                            W. Henderickx                                                                    Nokia                                                                 Y. Jiang                                            Huawei Technologies Co., Ltd.                                                               March 2017

             Pseudowire (PW) Endpoint Fast Failure Protection


   This document specifies a fast mechanism for protecting pseudowires    (PWs) transported by IP/MPLS tunnels against egress endpoint    failures, including egress attachment circuit (AC) failure, egress    provider edge (PE) failure, multi-segment PW terminating PE failure,    and multi-segment PW switching PE failure.  Operating on the basis of    multihomed customer edge (CE), redundant PWs, upstream label    assignment, and context-specific label switching, the mechanism    enables local repair to be performed by the router upstream adjacent    to a failure.  The router can restore a PW in the order of tens of    milliseconds, by rerouting traffic around the failure to a protector    through a pre-established bypass tunnel.  Therefore, the mechanism    can be used to reduce traffic loss before global repair reacts to the    failure and the network converges on the topology changes due to the    failure.

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

 Shen, et al.                 Standards Track                    [Page 1]
 RFC 8104           PW Endpoint Fast Failure Protection        March 2017

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