Use this command to configure the minimum amount of time between Shortest Path First (SPF) processing on an IS-IS instance.
| interval | Specifies the time delay (in milli-seconds) between successive SPFs. Valid values are 0 - 5000 milli-seconds. Default value is 33 milli-seconds. |
None.
IS-IS router configuration.
When a topology change occurs the SPF calculation is run. The SPF calculation is not run when external routes change.
The SPF calculation is CPU intensive. For a network with a large area and frequent topology changes you may want to increase the minimum time between SPF calculations. Increasing the SPF interval reduces the processor load, but potentially slows the rate of convergence.
The “no” form of this command resets the minimum interval between consecutive SPFs to the default value of 33 milli-seconds.
This example shows how to set the interval between consecutive SPFs to 75 milli-seconds:
System(rw)->configure System(rw-config)->router isis System(rw-config-isis)->spf-interval 75 System(rw-config-isis)->
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