Resources for Preferred Path Routes in IGPs

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Last updated 2019-11-18 (latest revision 2019-05-16)
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Preferred Path Routing (PPR) is concerned with setting up the route for a given prefix as specified in the path description along with a corresponding data plane/forwarding identifier PPR-ID. This document specifies an extension to PPR, a mechanism to perform resource reservations nodes on Preferred Path Routes (PPR) for IGPs (IS-IS, OSPFv2, OSPFv3). This is done by specifying the resources that need to be reserved along the path using PPR path attributes.


Uma Chunduri (
Richard Li (
Kevin Smith (

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