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Managing Source Learning

Using Static Multicast MAC Addresses

OmniSwitch AOS Release 6 Network Configuration Guide

page 2-7

Using static multicast MAC addresses allows you to send traffic intended for a single destination multi-
cast MAC address to selected switch ports within a given VLAN. To specify which ports will receive the 
multicast traffic, a static multicast address is assigned to each selected port for a given VLAN. The ports 
associated with the multicast address are then identified as egress ports. When traffic received on ports 
within the same VLAN is destined for the multicast address, the traffic is forwarded only on the egress 
ports that are associated with the multicast address.

When defining a static multicast MAC address for a particular port and VLAN, consider the following:

• A MAC address is considered a multicast MAC address if the least significant bit of the most signifi-

cant octet of the address is enabled. For example, MAC addresses with a prefix of 01, 03, 05, 13, etc., 
are multicast MAC addresses. 

• If a multicast prefix value is not present, then the address is treated as a regular MAC address and not 

allowed when using the mac-address-table static-multicast command. 

• Multicast addresses within the following ranges are not supported:

01:00:5E:00:00:00 to 01:00:5E:7F:FF:FF
01:80:C2:XX.XX.XX
33:33:XX:XX:XX:XX

• Configuring static multicast addresses is only supported on non-mobile ports.

• In addition to configuring the same static multicast address for multiple ports within a given VLAN, it 

is also possible to use the same multicast address across multiple VLANs. 

• The specified port or link aggregate ID must already belong to the specified VLAN. Use the 

vlan port default command to assign a port or link aggregate to a VLAN before you configure the 
static multicast address.

 command is used to define a destination multicast MAC address 

and assign the address to one or more egress ports within a specified VLAN. For example, the following 
command assigns the multicast address 01:25:9a:5c:2f:10 to port 1/24 in VLAN 20:

-> mac-address-table static-multicast 01:25:9a:5c:2f:10 1/24 20

To assign a multicast address to more than one port, enter a range of ports and/or multiple port entries on 
the same command line separated by a space. For example, the following command assigns the multicast 
address 01:25:9a:5c:2f:10 to port 1/24 and ports 2/1 through 2/6 in VLAN 20:

-> mac-address-table static-multicast 01:25:9a:5c:2f:10 1/24 2/1-6 20

Use the no form of the 

 command to delete static multicast MAC 

address entries. For example, the following command deletes a static multicast address that is assigned to 
port 2 on slot 3 for VLAN 855:

-> no mac-address-table static-multicast 01:00:02:CE:10:37 3/2 855