Managing Source Learning Using Static Multicast MAC Addresses
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 3-5
Using Static Multicast MAC Addresses
Using static multicast MAC addresses allows you to send traffic intended for a single destination multicast
MAC address to selected switch ports within a given VLAN. To specify which ports 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.
The mac-learning multicast mac-address command is used to configure a static multicast MAC address.
When defining this type of static 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
significant 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 with the mac-learning vlan multicast mac-address command.
• The 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
• 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.
Configuring Static Multicast MAC Addresses
The mac-learning multicast mac-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-learning vlan 20 port 1/1 multicast mac-address 01:25:9a:5c:2f:10
Use the no form of the mac-learning multicast mac-address command to delete static multicast MAC
address entries:
-> no mac-learning vlan 20 port 1/1 multicast mac-address 01:25:9a:5c:2f:10
If a MAC address, slot/port and VLAN ID are not specified with this form of the command, then all static
multicast addresses are deleted. For example, the following command deletes all static MAC addresses,
regardless of their slot/port or VLAN assignments:
-> no mac-learning multicast
To verify the static MAC address configuration and other table entries, use the show mac-learning and
show mac-learning commands. For more information about these commands, see the OmniSwitch AOS
Release 8 CLI Reference Guide.
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