Preferred Path Routing (PPR) in OSPF
Futurewei
Futurewei
Juniper Networks
Apstra Inc.
Telefonica
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.