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• If a match is found, UDP helper duplicates the packet and modifies the destination IP address of

the copy to the configured unicast address. Then UDP helper forwards the unicast packet to the

unicast address.

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

To configure UDP helper to convert broadcast to unicast:

Step Command Remarks

1. Enter system view.

system-view

N/A

2. Enable UDP helper.

udp-helper enable

By default, UDP helper is

disabled.

3. Specify a UDP port.

udp-helper port

{ port-number |

dns

netbios

netbios-ns

tacacs

tftp

time

}

By default, no UDP port is

specified.

4. Enter interface view.

interface

interface-type interface-number N/A

5. 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.