ISIS Segment Routing Flexible Algorithm

Document Type Replaced Internet-Draft (individual)
Authors Peter Psenak  , Shraddha Hegde  , Clarence Filsfils  , Arkadiy Gulko 
Last updated 2018-02-16
Replaced by draft-ietf-lsr-flex-algo
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Expired & archived
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Stream Stream state (No stream defined)
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IESG IESG state Replaced by draft-ietf-lsr-flex-algo
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


IGP protocols traditionally compute best paths over the network based on the IGP metric assigned to the links. Many network deployments use RSVP-TE based or Segment Routing based Traffic Engineering to enforce traffic over a path that is computed using different metrics or constraints than the shortest IGP path. Various mechanisms are used to steer the traffic towards such traffic engineered paths. This document proposes a solution that allows IGPs themselves to compute constraint based paths over the network without the use of the above mentioned traffic engineering technologies.


Peter Psenak (
Shraddha Hegde (
Clarence Filsfils (
Arkadiy Gulko (

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