UDP Helper Configuration 105
Note:
■ After you have configured DHCP Relay, the Switch automatically configure
UDP-Helper whether the Switch is a single unit or in a fabric. The UDP-Helper
configuration remains when you remove the DHCP Relay configuration.
■ If you remove UDP-Helper configuration when the DHCP Relay configuration
still remains, the Switch will display the following prompt
This may result in
DHCP Relay errors
, and you will need to confirm if you really want to remove
the UDP-Helper configuration.
Enabling/Disabling UDP Helper Function
When the UDP Helper function is enabled, you can configure the UDP ports where
UDP function is required and the relay function is enabled at UDP ports 69, 53, 37,
137, 138, and 49. When the function is disabled, the relay function configured at
all UDP ports, including the default six ports, is disabled.
Perform the following configuration in System View.
By default, the UDP Helper function is disabled.
Configuring UDP Port with Replay Function
When the UDP relay function is enabled, by default the system forwards the
broadcast packets on the UDP ports listed in
Tabl e 101. You can configure up to
256 UDP ports with the relay function.
Perform the following configuration in System View.
Tab le 100 Enabling/Disabling UDP Helper function
Operation Command
Enable UDP Helper function udp-helper enable
Disable UDP Helper function undo udp-helper enable
Tab le 101 Default UDP Ports List
Protocol UDP port ID
Trivial File Transfer Protocol (TFTP) 69
Domain Name System (DNS) 53
Time service 37
NetBIOS Name Service (NetBIOS-NS) 137
NetBIOS Datagram Service (NetBIOS-DS) 138
Terminal Access Controller Access Control System (TACACS) 49
Tab le 102 Configuring UDP Port with Replay Function
Operation Command
Configure UDP port with
replay function
udp-helper port {
port
| dns | netbios-ds |
netbios-ns | tacacs | tftp | time}
Remove the configuration undo udp-helper port {
port
| dns | netbios-ds |
netbios-ns | tacacs | tftp | time }
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