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The maximum number of secure MAC addresses that can be configured in Cisco Catalyst switches when port security is configured
A secure port has a default of one MAC address. The default can be changed to any value between 1 and 3,000. The upper limit of 3,000 guarantees one MAC address per port and an additional 3,000 across all ports in the system.
In Cisco Catalyst 2900XL/3900XL switches, issue the port security [max-mac-countaddresses] command to set the maximum number of secure addresses that this port can support. The maximum number of addresses that the port can learn is 132.
In Cisco Catalyst 3750 switches, issue the switchport port-security maximumvalue command to set the maximum number of secure MAC addresses for the interface. The maximum number of secure MAC addresses that can be configured on a switch stack is determined by the maximum number of available MAC addresses allowed in the system. This number is determined by the active Switch Database Management (SDM) template. Refer to Configuring SDM Templates for more information.
After the maximum number of secure MAC addresses is set on a port, include the secure addresses in an address table in one of these ways: