H3C S3600 Series User Manual

Operation Manual – UDP Helper
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
UDP Helper Configuration
1-2
1.2 Configuring UDP Helper
Table 1-2 Configure UDP Helper
Operation Command Description
Enter system view
system-view
—
Enable UDP Helper
udp-helper enable
Required
Disabled by default
Specify a UDP port
udp-helper port
{ port-number | dns |
netbios-ds | netbios-ns |
tacacs | tftp | time }
Optional
To use the default UDP
ports for relay forwarding,
this command can be
ignored, otherwise, use
this command to perform
configuration as required.
After UDP-Helper is
enabled, the broadcast
packets through ports 53,
138, 137, 49, 69 and 37
are relayed by default.
Enter VLAN interface
view
interface Vlan-interface
vlan-id
—
Configure the destination
server to which the UDP
packets are to be
forwarded
udp-helper server
ip-address
Required
No destination server is
configured by default.
Note that:
z You need to enable the UDP Helper function before specifying any UDP port to
relay UDP broadcast packets; otherwise, the configuration fails.
z The dns, netbios-ds, netbios-ns, tacacs, tftp, and time keywords correspond to
the six default ports. You can configure the default ports by specifying port
numbers or the corresponding parameters. For example, udp-helper port 53 and
udp-helper port dns specify the same port.
z With the UDP Helper function enabled, the six default ports are specified to be
UDP ports to relay UDP broadcast packets, no further configuration is need.
z When you view the configuration information by using the display
current-configuration command, the UDP Helper configuration on default UDP
ports is not displayed. The UDP Helper configuration of a default UDP port is
displayed only when UDP Helper is disabled on the port.
z When the UDP helper function is disabled, all configured UDP ports are disabled,
including the default ports.
z A UDP helper enabled device can have up to 256 UDP port for packet relay.
z A VLAN interface corresponds to a maximum of 20 destination servers.

H3C S3600 Series Specifications

General

Brand	H3C
Model	S3600 Series
Category	Switch
Language	English