3com 8807 User Guide

Note that:

1 You cannot specify the UDP ports before the function of forwarding UDP 

broadcast packets is enabled. Otherwise, the system prompts error.

2 The dns | netbios-ds | netbios-ns | tacacs | tftp | time keyword refers to six 

default UDP ports. You can specify a default UDP port in one of the two following 
ways:

■

Specifying the port number.

■

Specifying the keyword.

For example, the udp-helper port 53 command speicifies the same port as the 
udp-helper port dns command.

3 The display current-configuration command does not display the default port 

numbers. A default port number is displayed when the function of forwarding 
UDP broadcast packets is disabled on this port.

4 If the undo udp-helper server command is executed without any parameters, all 

destination servers configured on the VLAN interface are removed.

After completing the configuration above, you can execute the display command 
in any view to verify the configuration by checking the displayed information.

Table 676   Display UDP helper

Display the information of the destination 
servers corresponding to the VLAN interface 

display udp-helper { server [ interface 
vlan-interface vlan-id ] | port }