type: u32
help: Interval between hello packets
default: 10
syntax:expression: $VAR(@) >= 1 && $VAR(@) <= 65535; "Must be between 1-65535"
val_help: u32:1-65535; Interval between OSPF hello packets in seconds (default 10)

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