Port security mac address sticky

Wired Intelligent Edge (Campus Switching and Routing)

Establish a console session with devices R1 than configure the devices respected hostname s. Assign the IP Address Upon a port security violation, restrict the port. However, this lab can be completed using the Stub Lab.

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  • Understanding and Using Persistent MAC Learning!
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This command is executed in interface configuration mode and statically sets a MAC address that allows traffic with the source MAC to traverse the switch. This command is executed in interface configuration mode and configures the port to dynamically learn the MAC address and automatically configure the MAC address as a static MAC address associated with the port. This command is executed in privileged mode to erase the current secure mac-address table for a specified switch port.

  • Configuring Persistent MAC Learning (ELS)!
  • Port Security.
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How to prevent MAC flooding attacks by configuring switchport port-security

Post a comment Name Comment it up If the original port is down when you move the device, then the new port will learn the MAC address and the device can connect. However, if you do not clear the persistent MAC address on the original port, then when the port restarts, the system reinstalls the persistent MAC address in the forwarding table for that port. If this occurs, the persistent MAC address is removed from the new port and the device loses connectivity.

After you set a new MAC limit for the interface, the system clears existing entries in the MAC address forwarding table associated with the interface. You can enable it to allow dynamically learned MAC addresses to be retained on an interface across restarts of the switch. Help prevent traffic losses for trusted workstations and servers because the interface does not have to relearn the addresses from ingress traffic after a restart.


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Protect the switch against security attacks—use persistent MAC learning in combination with MAC limiting to protect against attacks while still avoiding the need to statically configure MAC addresses. When the initial learning of MAC addresses up to the number specified by the MAC limit is done, new addresses will not be allowed even after a reboot. The port is secured because after the limit has been reached, additional devices cannot connect to the interface.

The first devices that send traffic after you connect are learned during the initial connection period.

Switchport port-security/maximum/mac-address sticky/protect/restrict/shutdown demo

You can monitor the MAC addresses and provide the same level of security as if you statically configured each MAC address on each interface, except with less manual effort. Persistent MAC learning also helps prevent traffic loss for trusted workstations and servers because the interface does not have to relearn the addresses from ingress traffic.