Configuring the IS-IS flooding mechanism

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 fast-flood command and specify a value to implement IS-IS fast-flood.
   

   device(config-isis-router)# fast-flood 10
   

The following example configures IS-IS to flood 10 LSPs before running SPF.

device# configure terminal
device(config)# router isis
device(config-isis-router)# fast-flood 10