3Com 5500-EI PWR Install Manual page 796

Network diagram
Figure 1-1 Network diagram for UDP Helper configuration
Configuration procedure
# Enable Switch A to receive directed broadcasts to a directly connected network.
<SwitchA> system-view
[SwitchA] ip forward-broadcast
# Enable UDP Helper on Switch A.
[SwitchA] udp-helper enable
# Configure the switch to forward broadcasts containing the destination UDP port number 137. (By
default, the device enabled with UDP Helper forwards the broadcasts containing the destination UDP
port number 137.)
[SwitchA] udp-helper port 137
# Specify the destination server IP address on Vlan-interface 1.
[SwitchA] interface Vlan-interface 1
[SwitchA-Vlan-interface1] udp-helper server 192.168.10.2
# Enable the UDP Helper TTL-keep function on Switch A.
[SwitchA] udp-helper ttl-keep enable
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