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324 CHAPTER 18: MULTICAST PROTOCOL
Multicast MAC Address
Entry Configuration
In Layer 2 multicast, the system can add multicast forwarding entries dynamically
through Layer 2 multicast protocol. However, you can also manually create a static
multicast address entry to bind a port to a multicast address.
Generally, when receiving a multicast packet whose multicast address has not yet
been registered on the switch, the switch broadcasts the packet in the VLAN.
However, you can configure a static multicast MAC address entry to avoid this case.
Table 322 describes how to configure a multicast MAC address entry.
You can use the corresponding undo command to cancel the creation.
Note that:
■ If the multicast MAC address entry you are creating has already been existed, the
system gives you a prompt.
■ The switch will not learn a manually added multicast MAC address by IGMP
Snooping. The undo mac-address multicast command can only remove
manually created multicast MAC address entries and cannot remove those learned
by the switch.
■ When adding a port to a manually created multicast MAC address entry, you
should first remove the entry, then re-create the entry and specify the port as the
forward port of the entry.
■ The system does not support the configuring of multicast MAC address on an IRF
port. If you do this, the system will give you a prompt that the multicast MAC
address configuration fails.
■ You cannot enable port aggregation on a port where you have configured a
multicast MAC address; and you cannot configure a multicast MAC address on an
aggregated port.
Displaying Multicast
MAC Address
Configuration
You can use the following display command in any view to display the multicast
MAC address entry configuration.
Table 322 Configure a multicast MAC address entry
Operation Command Description
Enter system view system-view —
Add a multicast MAC address
entry
mac-address multicast
mac-address interface
interface-list vlan vlan-id
Required
mac-address must be a
multicast MAC address.
vlan-id is the VLAN ID the port
belongs to.
Enter Ethernet port view interface interface-type
interface-number
—
Add a multicast MAC address
entry.
mac-address multicast
mac-address vlan vlan-id
Required
This command is used in
Ethernet port view. It has the
same effect with the above
command used in system view
with the same port specified.
Table 323 Display multicast MAC address configuration
Operation Command Description
Display all the multicast MAC
address entries added
display mac-address
multicast static [ count |
mac-address vlan vlan-id |
vlan vlan-id ]
You can use the display
command in any view.