3Com WX3000 Common Multicast Configuration, Configuring a Multicast MAC Address Entry

3 Common Multicast Configuration

Common Multicast Configuration

Configuring a Multicast MAC Address Entry

In Layer 2 multicast, the system can add multicast forwarding entries dynamically through a Layer 2 multicast protocol. Alternatively, you can statically bind a port to a multicast MAC address entry by configuring a multicast MAC address entry manually.

Generally, when receiving a multicast packet for a multicast group not yet registered on the device, the device will flood the packet within the VLAN to which the port belongs. You can configure a static multicast MAC address entry to avoid this.

Follow these steps to configure a multicast MAC address entry in system view:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Create a multicast MAC	mac-address multicast	Required
	mac-address interface	The mac-addressargument must
address entry
	interface-list vlan vlan-id	be a multicast MAC address.

Follow these steps to configure a multicast MAC address entry in Ethernet port view:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Enter Ethernet port view	interface interface-type	—
	interface-number
Create a multicast MAC	mac-address multicast	Required
		The mac-addressargument must
address entry.	mac-address vlan vlan-id
		be a multicast MAC address.

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If the multicast MAC address entry to be created already exists, the system gives you a prompt. If you want to add a port to a multicast MAC address entry created through the mac-address multicast command, you need to remove the entry first, create this entry again, and then add the specified port to the forwarding ports of this entry.

You cannot enable link aggregation on a port on which you have configured a multicast MAC address, and you cannot configure a multicast MAC address on an aggregation port.

You cannot configure a multicast MAC address starting with 01005e in an IGMP-Snooping-enabled VLAN. You can do that if IGMP Snooping is not enabled in the VLAN.

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