Example: Configuring UDP helper to convert broadcast to multicast

As shown in Figure 58, VLAN-interface 1 of Switch B can receive multicast packets destined to 225.1.1.1.

Configure UDP helper to convert broadcast to multicast on VLAN-interface 1 of Switch A. This feature enables Switch A to forward broadcast packets with UDP destination port number 55 to the multicast group 225.1.1.1.

	IMPORTANT: By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

Make sure Switch A can reach the subnet 10.2.0.0/16.

# Enable UDP helper.

<SwitchA> system-view
[SwitchA] udp-helper enable

# Enable the UDP port 55 for UDP helper.

[SwitchA] udp-helper port 55

# Configure UDP helper to convert broadcast packets to multicast packets destined for 225.1.1.1.

[SwitchA] interface vlan-interface 1
[SwitchA-Vlan-interface1] ip address 10.110.1.1 16
[SwitchA-Vlan-interface1] udp-helper broadcast-map 225.1.1.1
[SwitchA-Vlan-interface1] quit

# Enable IP multicast routing globally.

[SwitchA] multicast routing 
[SwitchA-mrib] quit

Enable PIM-DIM and IGMP on VLAN-interface 1.

[SwitchA] interface vlan-interface 1
[SwitchA-Vlan-interface1] pim dm
[SwitchA-Vlan-interface1] igmp enable

# Configure VLAN-interface 1 as a static member of the multicast group 225.1.1.1.

[SwitchA-Vlan-interface1] igmp static-group 225.1.1.1
[SwitchA-Vlan-interface1] quit

# Enable PIM-DIM and IGMP on VLAN-interface 2.

[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] pim dm
[SwitchA-Vlan-interface2] igmp enable

# Configure VLAN-interface 2 as a static member of the multicast group 225.1.1.1.

[SwitchA-Vlan-interface2] igmp static-group 225.1.1.1

Verify that you can capture multicast packets from Switch A on Switch B.