Users Guide

SPF throttling slows down the frequency at which route calculations are performed during network instability.
Even though throttling route calculations slows down network convergence, not throttling can result in a network
not functioning as expected. If network topology is unstable, throttling slows down the scheduling of route
calculations until the topology regains its stability.
The first route calculation is controlled by the initial wait interval and the second calculation is controlled by the
second wait interval. Each subsequent wait interval is twice as long as the previous one until the wait interval
reaches the maximum wait time specified (interval seconds). After the network calms down and there are
no triggers for two times the maximum interval, fast behavior is restored (the initial wait time).
Intermediate System to Intermediate System (IS-IS) 775