OSPF Router Dead Interval of the interface. This is the time elapsed between not hearing a router's Hello PDU before the interface OSPF state is declared down. The dead interval is a timer used to timeout inactive adjacencies. The dead interval value should always be greater than the hello interval value. By default, the interface shall be set to four times the value of the HELLOINT, so the default is 40 seconds. Current configurable range: 1 to 65535.