Changing the hello interval for an IS-IS interface

1. Enter the configure terminal command to access global configuration mode.
   

   device# configure terminal

2. Enter the interface ethernet command and specify an interface.
   

   device(config)# interface ethernet 1/2
   

3. Enter the isis hello-interval command with the level-1 parameter, and specify a value, to change the hello interval for Level 1 packets for the interface.
   

   device(conf-if-eth-1/2)# isis hello-interval level-1 20
   

The following example changes the hello interval for Level 1 packets to 20 on a Loopback interface.

device# configure terminal
device(config)# interface ethernet 1/2
device(conf-if-eth-1/2)# isis hello-interval level-1 20