Preferred Path Routing (PPR) in IS-IS

Document Type Expired Internet-Draft (individual)
Authors Uma Chunduri  , Richard Li  , Russ White  , Jeff Tantsura  , Luis Contreras  , Yingzhen Qu 
Last updated 2021-04-01 (latest revision 2020-09-28)
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This Internet-Draft is no longer active.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 Preferred Path Routing (PPR), an extensible method of providing path based dynamic routing for a number of packet types including IPv4, IPv6 and MPLS. PPR uses a simple encapsulation to add the path identity to the packet. PPR can also be used to mitigate the MTU and data plane processing issues that may result from Segment Routing (SR) packet overhead; and also supports further extensions along the paths.


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.)