type: u32
help: Interval after which neighbor is dead
default: 40
syntax:expression: $VAR(@) >= 1 && $VAR(@) <= 65535; "Must be between 1-65535"
val_help: u32:1-65535; OSPF dead interval in seconds (default 40)

update:vtysh -c "configure terminal" -c "interface $IFNAME" -c "ip ospf dead-interval $VAR(@)"
delete:vtysh -c "configure terminal" -c "interface $IFNAME" -c "no ip ospf dead-interval"