3Com 5500-SI Configuration Manual page 304

304 C 17: N
HAPTER ETWORK
P O
ROTOCOL PERATION
Table 300 Default UDP Ports List
Protocol
NetBIOS Name Service (NetBIOS-NS)
NetBIOS Datagram Service (NetBIOS-DS)
Terminal Access Controller Access Control System (TACACS)
Perform the following configuration in System View.
Table 301 Configuring UDP Port with Replay Function
Operation
Configure UDP port with
replay function
Remove the configuration
Note that:
You must first enable the UDP Helper function and then configure the UDP port
■
with the relay function. Otherwise, error information will appear.
The parameters
■
respectively refer to the six default ports. You can configure the default UDP port
in two ways: specifying port IDs and specifying the correct parameters. For
example, the
udp-helper port 53
command in function.
port dns
The default UDP ports are not displayed when using the
■
current-configuration
is disabled.
Configuring the Relay Destination Server for Broadcast Packet
You can configure up to 20 relay destination servers for a VLAN interface. If a VLAN
interface is configured with relay destination servers and UDP Helper function is
enabled on the VLAN interface, then the broadcast packets of a designated UDP port
received at the VLAN interface will be unicasted to the destination server.
Perform the following configuration in VLAN Interface View.
Table 302 Configuring the Relay Destination Server for Broadcast Packet
Operation
Configure relay destination server for
broadcast packet
Delete relay destination server for
broadcast packet
Note that:
The
■ undo udp-helper server
destination servers configured on the interface.
By default, no relay destination server for UDP broadcast packets is configured.
■
Command
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 }
dns, netbios-ds, netbios-ns, tacacs, tftp
command is equivalent to the
command. But its ID is displayed after its relay function
Command
udp-helper server ip_address
undo udp-helper server [ip_address ]
command (without any parameter) deletes all
UDP port ID
137
138
49
and
time
udp-helper
display