Out of a maximum allocated number of MAC addresses on a port, you can manually configure all, allow all to be autoconfigured, or configure some manually and allow the rest to be autoconfigured. 901 (1 + 900) on one port, 101 (1 + 100) on another port, 25 (1 + 24) on a third port, and 1 address on each of the rest of the portsĪfter you allocate the maximum number of MAC addresses on a port, you can either specify the secure MAC address for the port manually or have the port dynamically configure the MAC address of the connected devices.
#Cisco command to find mac address on port plus
The total number of MAC addresses that can be specified per port is limited to the global resource of 1024 plus 1 default MAC address. Allowing Traffic Based on the Host MAC Address Alternatively, you can use port security to filter traffic that is destined to or received from a specific host that is based on the host MAC address. You can use port security to block input to an Ethernet, Fast Ethernet, or Gigabit Ethernet port when the MAC address of the station attempting to access the port is different from any of the MAC addresses that are specified for that port. Monitoring Port Security Understanding How Port Security Works.Configuring Port Security on the Switch.Note For complete syntax and usage information for the commands that are used in this chapter, refer to the Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command Reference.
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