"ip forward-protocol udp ..." why???

IP Address: 192.168.30.201
Subnet mask: 255.255.240.0

Broadcast Address: BA = (IP) | ~(SM)

192.168.30.201 |
0.0.15.255
--------------
192.168.31.255

Broadcast Address: 192.168.31.255

Broadcast - A transmission to all interface cards on the network.
* Limited Broadcast - Sent to all NICs on the some network segment as the source NIC. It is represented with the 255.255.255.255 TCP/IP address. This broadcast is not forwarded by routers so will only appear on one network segment.
* Direct broadcast - Sent to all hosts on a network. Routers may be configured to forward directed broadcasts on large networks. For network 192.168.31.0, the broadcast is 192.168.31.255.

It selectively forward limited UDP broadcasts received on an IP interface to a configured IP address.
The default ports forwarded are:

• Time service (port 37)
• TACACS service (port 49)
• Domain Naming System (port 53)
• Trivial File Transfer Protocol (TFTP) (port 69)
• NetBIOS Name Server (port 137)
• NetBIOS Datagram Server (port 138)

Reference:
Cisco IOS IP command referance - "ip forward-protocol"
http://www.comptechdoc.org/independent/networking/guide/netbroadcasting.html