3com S7906E Instruccion De Instalación
1-2
To do…
Use the command…
Remarks
Enter interface view
interface interface-type
interface-number
interface-number
—
Specify the destination server
to which UDP packets are to be
forwarded
to which UDP packets are to be
forwarded
udp-helper server ip-address
Required
No destination server is
specified by default.
specified by default.
z
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.
z
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.
z
The configuration of all UDP ports is removed if you disable UDP Helper.
z
You can configure up to 256 UDP port numbers to enable the forwarding of packets with these
UDP port numbers.
z
You can configure up to 20 destination servers on an interface.
Displaying and Maintaining UDP Helper
To do…
Use the command…
Remarks
Displays the information of
forwarded UDP packets
forwarded UDP packets
display udp-helper server
[ interface interface-type
interface-number ]
[ interface interface-type
interface-number ]
Available in any view
Clear statistics about packets
forwarded
forwarded
reset udp-helper packet
Available in user view
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.