Displaying And Maintaining Udp Helper; Udp Helper Configuration Example - HP A5120 EI Series Configuration Manual

CAUTION:

A UDP Helper enabled device cannot forward DHCP broadcast packets. The UDP port number cannot be set to
67 or 68.

You can specify a port number or the corresponding parameter for a UDP port to forward packets. For example,
udp-helper port 53 and udp-helper port dns specify the same UDP port number.

The configuration of all UDP ports is removed if you disable UDP Helper.

You can configure up to 256 UDP port numbers to enable the forwarding of packets with these UDP port
numbers.

You can configure up to 20 destination servers on an interface.

Displaying and maintaining UDP Helper

To do...
Displays the information of
forwarded UDP packets
Clear statistics about packets
forwarded

UDP Helper configuration example

Network requirements
As shown in
connects to the subnet 10.1 10.0.0/16.
Configure UDP Helper to forward broadcast packets with UDP destination port number 55 and
destination IP address 255.255.255.255 or 10.1 10.255.255 to the destination server 10.2.1.1/16.
Figure 50 Network diagram for UDP Helper configuration
Vlan-int1
10.110.1.1/16
Switch A
Configuration procedure
NOTE:
Check that a route from Switch A to the subnet 10.2.0.0/16 is available.
# Enable Switch A to receive directed broadcasts.
<SwitchA> system-view
Use the command...
display udp-helper server [ interface
interface-type interface-number ] [ | {
begin | exclude | include } regular-
expression ]
reset udp-helper packet
Figure 50, the IP address of VLAN-interface 1 of Switch A is 10.1 10.1.1/16, and the interface
Vlan-int1
10.2.1.1/16
IP network
Server
Switch B
110
Remarks
Available in any view
Available in user view