Disabling incremental shortcut SPF optimizations

You can configure IS-IS to perform a full SPF calculation when any network topology change occurs so that IS-IS always runs full SPF for all such network changes. This task disables incremental SPF optimizations so that IS-IS always runs full SPF for all such network changes.

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
   

Example

The following example disables incremental SPF optimizations.

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