Displaying And Maintaining Udp-Helper - 3Com 7757 Configuration Manual

736 C 67: UDP-H
HAPTER
Displaying and
Maintaining
UDP-Helper
C
ELPER ONFIGURATION
Table 592 Configure UDP-Helper
Operation
Configure a UDP port as a
UDP-Helper destination port
Enter VLAN interface view
Configure the destination
server to which the matched
UDP broadcast packets are to
be forwarded
c
CAUTION:
You need to enable the UDP-Helper function before specifying a UDP-Helper
■
destination port.
The dns, netbios-ds, netbios-ns, tacacs, tftp, and time keywords refers to
■
the six default UDP ports. You can configure a default port to be a UDP-Helper
destination port by specifying the corresponding port number or the
corresponding keyword. For example, udp-helper port 53 and udp-helper
port dns specify the same port as a UDP-Helper destination port.
The display current-configuration command does not display the default
■
UDP ports that are configured to be UDP-Helper destination ports.
After UDP-Helper is disabled, all the configured UDP ports are cancelled,
■
including the default ports.
You can configure up to 20 destination servers on a VLAN interface.
■
If the destination server is configured on a VLAN interface, the UDP broadcast
■
packets received from the ports in the VLAN with specific UDP-Helper
destination ports are forwarded to the destination server configured on the
VLAN interface.
After performing the above configurations, you can use the display command in
any view to display the information about the destination servers and the number
of the packets forwarded to each destination server. Verify the configuration by
checking the output information. You can use the reset command in user view to
clear statistics about packets forwarded by UDP-Helper.
Table 593 Display and Maintain UDP-Helper
Operation
Display the information about
the destination servers and
the number of the packets
forwarded to each destination
server
Command
udp-helper port { port | dns |
netbios-ds | netbios-ns |
tacacs | tftp | time }
interface vlan-interface
vlan-id
udp-helper server ip-address Required
Command
display udp-helper server
[ interface vlan-interface
vlan-id ]
Description
This operation is unnecessary
if the port is among the
default UDP ports listed in
Table 591.
With UDP-Helper enabled,
UDP broadcast packets
destined for the ports listed in
Table 591 are relayed by
default.
-
By default, no destination
server is configured
Description
You can use the display
command in any view