Disabling incremental shortcut SPF optimizations

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 disable-partial-spf-opt command to disable partial SPF optimizations.
   

   device(config-isis-router)# disable-incremental-spf-opt
   

The following example disables incremental SPF optimizations.

device# configure terminal
device(config)# router isis
device(config-isis-router)# disable-incremental-spf-opt