H3C Technologies H3C S12500 Series Switches - Manual (Page 145)

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# Enable the forwarding broadcast packets with the UDP destination port 55.
[SwitchA] udp-helper port 55
# Specify the public IP address of the destination server as 10.2.1.1 on VLAN-interface 1.
[SwitchA] interface vlan-interface 1
[SwitchA-Vlan-interface1] ip address 10.110.1.1 16
[SwitchA-Vlan-interface1] udp-helper server 10.2.1.1