3com 4210 User Manual

C

HAPTER

 29: UDP H

ELPER

 C

ONFIGURATION

 G

UIDE

[SwitchA] udp-helper enable 

# Configure the switch to forward broadcasts containing the destination UDP port 
number 137. (By default, the device, after enabled with UDP Helper, forwards the 
broadcasts containing the destination UDP port number 137.)

[SwitchA] udp-helper port 137 

# Specify the destination server on VLAN-interface 1.

[SwitchA] interface Vlan-interface 1

[SwitchA-Vlan-interface1] udp-helper server 192.168.10.2 

#

ip forward-broadcast

#

udp-helper enable

#

interface Vlan-interface

udp-helper server 192.168.10.2

# 

■

On a Switch 5500, the reception of directed broadcast packets to a directly 
connected network is disabled by default, but this feature must be enabled 
with the ip forward-broadcast command in system view before you can enable 
UDP Helper. For details about the ip forward-broadcast command, refer to “IP 
Addressing Configuration” and “IP Performance Configuration” in the 
Configuration Guide for your product.

■

You need to enable UDP Helper before specifying any UDP port to match UDP 
broadcasts; otherwise, error information is displayed. When the UDP helper 
function is disabled, all the specified UDP ports are disabled, including the 
default ports.

■

You can specify up to 20 destination server addresses on a VLAN interface.