Configuring IS-IS PSPF exponential back-off

  1. Enter the configure terminal command to access global configuration mode.
    device# configure terminal
  2. Enter the router isis command to enter IS-IS router configuration mode and enable IS-IS on the device.
    device(config)# router isis
    
  3. Enter the partial-spf-interval command with the level-1 parameter, specifying values for the max-wait , initial-wait , and second-wait parameters, to set the maximum interval between SPF recalculationss, the initial SPF calculation delay, and the hold time between the first and second SPF calculation.
    device(config-isis-router)# partial-spf-interval 15 10000 15000
    

The following example specifies that the maximum interval in seconds between SPF recalculations is 15 seconds. The initial SPF calculation delay is 10000 milliseconds and the hold time between the first and second SPF calculation is 15000 milliseconds.

device# configure terminal
device(config)# router isis
device(config-isis-router)# partial-spf-interval 15 10000 15000