Preferred Path Routing (PPR) in IS-IS

The information below is for an old version of the document
Document Type Expired Internet-Draft (individual)
Authors Uma Chunduri  , Richard Li  , Russ White  , Jeff Tantsura  , Luis Contreras  , Yingzhen Qu 
Last updated 2019-01-03 (latest revision 2018-07-02)
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This Internet-Draft is no longer active.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) mechanism to simplify the path description of data plane traffic in Segment Routing (SR) deployments. PPR aims to mitigate the MTU and data plane processing issues that may result from SR packet overheads; and also supports traffic measurement, accounting statistics and further attribute extensions along the paths. Preferred Path Routing is achieved through the addition of descriptions to IS-IS advertised prefixes, and mapping those to a PPR data-plane identifier.


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

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