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IS-IS Optimal Distributed Flooding for Dense Topologies

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Russ White , Shraddha Hegde , Shawn Zandi
Last updated 2020-07-27
Replaces draft-white-openfabric
Replaced by draft-white-lsr-distoptflood
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-white-lsr-distoptflood
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This Internet-Draft is no longer active.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 fabric topologies, flooding mechanisms designed for sparse topologies, when used in these dense topologies, can "overflood," or carry too many copies of topology and reachability 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 to a minimum, while increaseing convergence performance in dense topologies. Note that a Clos fabric is used as the primary example of a desne flooding topology throughout this document. However, the flooding optimizations described in this document apply to any dense topology.


Russ White
Shraddha Hegde
Shawn Zandi

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