Displaying And Maintaining Udp Helper; Udp Helper Configuration Examples; Udp Helper Configuration Example - 3Com 4500G Family Configuration Manual

To do...
Enter interface view
Specify the destination
server to which UDP packets
are to be forwarded
The UDP Helper enabled device cannot forward DHCP broadcast packets. That is to say, the UDP
port number cannot be set to 67 or 68.
For the dns, netbios-ds, netbios-ns, tacacs, tftp, and time keywords, you can specify port
numbers or the corresponding parameters. For example, udp-helper port 53 and udp-helper port
dns specify the same UDP port number.
The configuration of all UDP ports is removed if you disable UDP Helper.
You can configure up to 256 UDP port numbers to enable the forwarding of packets with these
UDP port numbers.
You can configure up to 20 destination servers on an interface.

Displaying and Maintaining UDP Helper

To do...
Displays the information of
forwarded UDP packets
Clear statistics about packets
forwarded

UDP Helper Configuration Examples

UDP Helper Configuration Example

Network requirements
On Switch A, configure UDP helper to forward broadcast packets (with UDP destination port number 55
and destination IP address 255.255.255.255 or 10.110.255.255 to the destination server 10.2.1.1/16.
Use the command...
interface interface-type
interface-number
udp-helper server ip-address
Use the command...
display udp-helper server
[ interface interface-type
interface-number ]
reset udp-helper packet
1-2
Remarks
—
Required
No destination server is specified
by default.
Remarks
Available in any view
Available in user view