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IS-IS Optimal Distributed Flooding for Dense Topologies

Document Type Replaced Internet-Draft (candidate for lsr WG)
Expired & archived
Authors Russ White , Shraddha Hegde , Tony Przygienda
Last updated 2022-11-22 (Latest revision 2022-07-11)
Replaces draft-white-distoptflood
Replaced by draft-ietf-lsr-distoptflood
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state Call For Adoption By WG Issued
Document shepherd (None)
IESG IESG state Replaced by draft-ietf-lsr-distoptflood
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


In dense topologies (such as data center fabrics based on the Clos and butterfly topologies, though not limited to these), IGP flooding mechanisms designed for sparse topologies can "overflood," or carry too many copies of topology and reachability information to fabric devices. This results in slower convergence times and higher resource utilization. The modifications to the flooding mechanism in the Intermediate System to Intermediate System (IS-IS) link state protocol described in this document reduce resource utilization significantly, while increasing convergence performance in dense topologies. Note that a Clos fabric is used as the primary example of a dense flooding topology throughout this document. However, the flooding optimizations described in this document apply to any topology.


Russ White
Shraddha Hegde
Tony Przygienda

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