H3C Technologies H3C S5560 Series Switches User Manual

Page 149

134

Step Command

Remarks

Enter system view.

system-view

N/A

Enable UDP helper.

udp-helper enable

By default, UDP helper is
disabled.

Specify a UDP port.

udp-helper port { port-number | dns |
netbios-ds | netbios-ns | tacacs | tftp |
time }

By default, no UDP port is
specified.

Enter interface view.

interface interface-type interface-number N/A

Specify a destination

server for UDP helper to
convert broadcast to

unicast.

udp-helper server ip-address [ global |
vpn-instance vpn-instance-name ]

By default, no destination server
is specified.
If you specify multiple

destination servers, UDP helper
creates one copy for each

server.
Use this command on the

interface that receives
broadcast packets.

Configuring UDP helper to convert broadcast to

multicast

You can configure UDP helper to convert broadcast packets with specific UDP port numbers to multicast

packets.
Upon receiving a UDP broadcast packet, UDP helper uses the configured UDP ports to match the UDP

destination port number of the packet.

•

If a match is found, UDP helper duplicates the packet and modifies the destination IP address of the
copy to the configured multicast address. Then UDP helper forwards the packet to the multicast
group.

•

If no match is found, UDP helper does not process the packet.

To configure UDP helper to convert broadcast to multicast: