H3C Technologies H3C S7500E Series Switches - Manual (Page 118)

12-2
To do… Use the command… Remarks
Enable the forwarding of packets
with the specified UDP destination
port number(s)
udp-helper port { port-number | dns
| netbios-ds | netbios-ns | tacacs |
tftp | time }
Required
No UDP port number is
specified by default.
Enter interface view
interface interface-type
interface-number
—
Specify the destination server to
which UDP packets are to be
forwarded
udp-helper server ip-address
Required
No destination server is
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
display udp-helper server
[ interface interface-type
interface-number ]
Available in any view
Clear statistics about packets
forwarded
reset udp-helper packet Available in user view