308 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring static MAC entries
9
Disabling the automatic learning of MAC addresses
By default, when a packet with an unknown Source MAC address is received on a port, the Dell
PowerConnect device learns this MAC address on the port.
You can prevent a physical port from learning MAC addresses by entering the following command.
PowerConnect(config)#interface ethernet 3/1
PowerConnect(config-if-e1000-3/1)#mac-learn-disable
Syntax: [no] mac-learn disable
Use the no form of the command to allow a physical port to learn MAC addresses.
Configuration notes and feature limitations
• This command is not available on virtual routing interfaces. Also, if this command is configured
on the primary port of a trunk, MAC address learning will be disabled on all the ports in the
trunk.
• Entering the mac-learn-disable command on tagged ports disables MAC learning for that port
in all VLANs to which that port is a member. For example, if tagged port 3/1 is a member of
VLAN 10, 20, and 30 and you issue the mac-learn-disable command on port 3/1, port 3/1 will
not learn MAC addresses, even if it is a member of VLAN 10, 20, and 30.
Displaying the MAC address table
To display the MAC table, enter the following command.
In the output of the show mac-address command, the Type column indicates whether the MAC
entry is static or dynamic. A static entry is one you create using the static-mac-address command.
A dynamic entry is one that is learned by the software from network traffic.
The show mac-address command output does not include MAC addresses for management ports,
since these ports do not support typical MAC learning and MAC-based forwarding.
Configuring static MAC entries
Static MAC addresses can be assigned to Dell PowerConnect devices.
PowerConnect#show mac-address
Total active entries from all ports = 3
Total static entries from all ports = 1
MAC-Address Port Type VLAN
1234.1234.1234 15 Static 1
0004.8038.2f24 14 Dynamic 1
0004.8038.2f00 13 Dynamic 1
0010.5a86.b159 10 Dynamic 1
