Router# configure terminal Router(config)#interface tunnel0 Router(config-if)#keepalive 5 4 !--- The syntax of this command is keepalive [seconds [retries]]. !--- Keepalives are sent every 5 seconds and 4 retries. !--- Keepalives must be missed before the tunnel is shut down. !--- The default values are 10 seconds for the interval and 3 retries.
Document ID: 64565 http://www.cisco.com/en/US/tech/tk827/tk369/technologies_tech_note09186a008048cffc.shtml