1-2To do… Use the command… RemarksEnter interface view interface interface-typeinterface-number —Specify the destinationserver to which UDP packetsare to be forwardedudp-helper server ip-addressRequiredNo destination server is specifiedby default.z The UDP Helper enabled device cannot forward DHCP broadcast packets. That is to say, the UDPport number cannot be set to 67 or 68.z For the dns, netbios-ds, netbios-ns, tacacs, tftp, and time keywords, you can specify portnumbers or the corresponding parameters. For example, udp-helper port 53 and udp-helper portdns 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 theseUDP port numbers.z You can configure up to 20 destination servers on an interface.Displaying and Maintaining UDP HelperTo do… Use the command… RemarksDisplays the information offorwarded UDP packetsdisplay udp-helper server[ interface interface-typeinterface-number ]Available in any viewClear statistics about packetsforwarded reset udp-helper packet Available in user viewUDP Helper Configuration ExamplesUDP Helper Configuration ExampleNetwork requirementsOn Switch A, configure UDP helper to forward broadcast packets (with UDP destination port number 55and destination IP address 255.255.255.255 or 10.110.255.255 to the destination server 10.2.1.1/16.
