1.1.1 debugging udp-helper
Syntax
debugging udp-helper { event | packet [ receive | send ] }
undo debugging
udp-helper { event | packet [ receive | send ]
}
View
User view
Parameter
event:
Enables/disables debugging for UDP-Helper events.
packet:
Enables/disables debugging for sending/receiving UDP-Helper packets.
receive:
Enables/disables debugging for receiving UDP-Helper packets.
send:
Enables/disables debugging for sending UDP-Helper packets.
Description
Use the debugging udp-helper command
to enable debugging for UDP-Helper.
Use the undo debugging udp-helper
command to disable debugging for UDP-Helper.
By default, debugging for UDP-Helper is
disabled.
Example
# Enable debugging for sending/receiving
UDP-Helper packets.
<H3C> debugging udp-helper
packet
Syntax
display udp-helper
server [ interface vlan-interface vlan-id ]
View
Any view
Parameter
vlan-id: ID
of a VLAN.
Description
Use the display udp-helper server command
to display the information about the configured destination servers connected
to a specified VLAN interface and the number of the packets forwarded to each
destination server. If you do not specified the vlan-id argument, the
corresponding information about all the VLAN interfaces is displayed.
Example
# Display the information about the
configured destination servers connected to VLAN 1 interface and the number of
the packets forwarded to the destination servers.
<H3C> display udp-helper server
interface Vlan-interface 1
Interface name Server address Packets
sent
Vlan-interface1 192.1.1.2 0
The information
above shows that the server with its IP address being 192.1.1.2 is configured
as a destination server and is connected to VLAN 1 interface, and no packets
are forwarded to it so far.
1.1.3 reset
udp-helper packet
Syntax
reset udp-helper packet
View
User view
Parameter
None
Description
Use the reset udp-helper packet
command to clear the statistics about the packets forwarded by UDP-Helper.
Example
# Clear the statistics about the packets
forwarded by UDP-Helper.
<H3C> reset udp-helper packet
Syntax
udp-helper enable
undo udp-helper enable
View
System view
Parameter
None
Description
Use the udp-helper enable command to
enable the UDP-Helper function.
Use the undo udp-helper enable
command to disable the UDP-Helper function.
By default, UDP-Helper is disabled.
Example
# Enable UDP-Helper.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] udp-helper enable
Syntax
udp-helper
port { port | dns | netbios-ds | netbios-ns
| tacacs | tftp | time }
undo udp-helper
port { port | dns | netbios-ds | netbios-ns
| tacacs | tftp | time }
View
System view
Parameter
port: number
of a UDP port to be configured as a UDP-Helper destination port, in the range 1
to 65535 (except for 67 and 68).
dns:
Specifies the DNS UDP port (port 53) as a UDP-Helper destination port.
netbios-ds:
Specifies the NetBIOS-DS UDP port (port 138) as a UDP-Helper destination port.
netbios-ns:
Specifies the NetBIOS-NS UDP port (port 137) as a UDP-Helper destination port.
tacacs:
Specifies the TACACS UDP port (port 49) as a UDP-Helper destination port.
tftp:
Specifies the TFTP UDP port (port 69) as a UDP-Helper destination port.
time:
Specifies the time service UDP port (port 37) as a UDP-Helper destination port.
Description
Use the udp-helper port command to
specify a UDP-Helper destination port.
Use the undo udp-helper port command
to disable a port from being a UDP-Helper destination port.
With UDP-Helper enabled, UDP broadcast
packets with their destination port being the six default UDP ports (that is,
port 69, 53, 37, 137, 138, and 49) are forwarded to the configured destination
servers by default. After the UDP-Helper function is disabled, all the
configured UDP-Helper destination ports are cancelled, including the default
UDP ports.
Note that before configuring udp-helper
port, you must enable UDP-Helper.
Example
# Configure the DNS UDP port as a
UDP-Helper destination port.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] udp-helper port dns
1.1.6
udp-helper server
Syntax
udp-helper server ip-address
undo udp-helper server [ ip-address ]
View
VLAN interface view
Parameter
ip-address: IP
address of the device to be configured as a destination server, in dotted
decimal notation.
Description
Use the udp-helper server command to
specify a destination server for the UDP broadcast packets to be forwarded.
Use the undo udp-helper server command
to remove a configured destination server.
No destination server is configured by
default.
Currently, you can configure up to 20
destination servers on a VLAN interface.
Note that if you do not provide the ip-address
argument when executing the undo udp-helper server command, all the
destination servers configured on the VLAN interface are removed.
Related command: display udp-helper
server.
Example
# Configure the device with its IP address
being 192.1.1.2 as a destination server for the UDP broadcast packets to be
forwarded on VLAN 1 interface.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] nterface Vlan-interface 1
[H3C-Vlan-interface1] udp-helper
server 192.1.1.2
