Cisco Cisco IOS Software Release 12.2(1)T

The OSPF Shortest Path First Throttling feature makes it possible to configure SPF scheduling in 
millisecond intervals and to potentially delay shortest path first (SPF) calculations during network 
instability. SPF is scheduled to calculate the Shortest Path Tree (SPT) when there is a change in topology. 
One SPF run may include multiple topology change events. 

The interval at which the SPF calculations occur is chosen dynamically and is based on the frequency of 
topology changes in the network. The chosen interval is within the boundary of the user-specified value 
ranges. If network topology is unstable, SPF throttling calculates SPF scheduling intervals to be longer 
until topology becomes stable. 

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12.2(14)S

This feature was introduced.

12.0(23)S

This feature was integrated into Cisco Release 12.0(23)S.

12.2(15)T

This feature was integrated into Cisco IOS Release 12.2(15)T.

For information about platforms supported, refer to Cisco Feature Navigator.