3Com 4210, 5500G, 4200G Broadcasts containing the destination UDP port number, Default ports

266CHAPTER 29: UDP HELPER CONFIGURATION GUIDE

[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
Complete Configuration	#
	ip forward-broadcast
	#
	udp-helper enable
	#
	interface Vlan-interface
	udp-helper server 192.168.10.2
	#
Precautions	■ 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.