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:
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 number. | udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs | tftp | time } | By default, no UDP port numbers are specified. |
4. Enter interface view. | interface interface-type interface-number | N/A |
5. Specify a destination multicast address for UDP helper to convert broadcast to multicast. | udp-helper broadcast-map multicast-address [ acl acl-number ] | By default, no destination multicast address is specified for UDP helper. If you specify multiple multicast addresses, UDP helper creates one copy for each address. Use this command on the interface that receives broadcast packets. |