Configuring UDP Helper

Before configuring UDP helper, configure a reachable route from the switch to the destination server.

Run system-view
The system view is displayed.
Run udp-helper enable
UDP helper is enabled.
(Optional) Run udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs | tftp | time }
The UDP destination port to which UDP broadcast packets are relayed is specified.

After UDP helper is enabled, the switch relays the UDP packets with the following destination ports by default: Time (37), TACACS (49), DNS (53), TFTP (69), NetBIOS-NS (137), and NetBIOS-DS (138). If the UDP destination port you want to specify is among the six ports, skip this step.
Run interface interface-type interface-number
The interface view is displayed.

The interface must be a VLANIF interface.
Run udp-helper server ip-address
The destination server for UDP helper is specified.

Run the display udp-helper port command to check the UDP port numbers of the packets that need to be relayed.