Preferred Path Routing (PPR) in OSPF

Document Type Expired Internet-Draft (individual)
Authors Uma Chunduri  , Yingzhen Qu  , Russ White  , Jeff Tantsura  , Luis Contreras 
Last updated 2020-09-09 (latest revision 2020-03-08)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document specifies a Preferred Path Routing (PPR), a routing protocol mechanism to simplify the path description of data plane traffic in Segment Routing (SR) deployments with OSPFv2 and OSPFv3 protocols. PPR aims to mitigate the MTU and data plane processing issues that may result from SR packet overheads; and also supports further extensions along the paths. Preferred path routing is achieved through the addition of path descriptions to the OSPF advertised prefixes, and mapping those to a PPR data-plane identifier.


Uma Chunduri (
Yingzhen Qu (
Russ White (
Jeff Tantsura (
Luis Contreras (

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