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

update: vtysh -c "configure terminal" -c "interface $IFNAME" \
          -c "ipv6 ospf6 dead-interval $VAR(@)"
delete: vtysh -c "configure terminal" -c "interface $IFNAME" \
          -c "ipv6 ospf6 dead-interval 40"