Configuring the Interval for Sending Hello Messages

The IS-IS protocol maintains neighbor relationships with neighboring devices through the sending and receiving of Hello messages. When neighboring devices do not receive the Hello message sent by the local end for a period of time, it will be considered that the neighbor has expired. The command set protocols isis area-tag <text> interface <interface-name> hello-interval <hello-interval> can be used to specify the interval time for sending Hello messages on an IS-IS interface. The hello-interval <hello-interval> value is an integer ranging from 1 to 600 seconds. The default value is 3 seconds.

The following commands configure the interval time for sending Hello messages on an IS-IS interface.