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Preferred Path Loop-Free Alternate (pLFA)

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Stewart Bryant , Uma Chunduri , Toerless Eckert
Last updated 2022-11-10 (Latest revision 2022-05-09)
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Fast re-route (FRR) is a technique that allows productive forwarding to continue in a network after a failure has occurred, but before the network has has time to re-converge. This is achieved by forwarding a packet on an alternate path that will not result in the packet looping. Preferred Path Routing (PPR) provides a method of injecting explicit paths into the routing protocol. The use of PPR to support FRR has a number of advantages. This document describes the advantages of using PPR to provide a loop-free alternate FRR path, and provides a framework for its use in this application.


Stewart Bryant
Uma Chunduri
Toerless Eckert

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)