Sticky mac cisco port security

Port Security Sticky AND Static MAC Address Entries

Persistent MAC address learning is disabled by default. You enable this feature on interfaces.

Network Resources

Prevent traffic losses for trusted workstations and servers because the interface does not have to relearn the addresses from ingress traffic after a restart. Protect the switch against security attacks.

Understanding Persistent MAC Learning (Sticky MAC)

The interface is secured because after the limit has been reached, additional devices cannot connect to the port. By configuring persistent MAC learning along with MAC limiting, you enable interfaces to learn MAC addresses of trusted workstations and servers from the time when you connect the interface to your network until the limit for MAC addresses is reached, and ensure that after this limit is reached, new devices will not be allowed to connect to the interface even if the switch restarts.

Mac Address Tables

As an alternative to using persistent MAC learning with MAC limiting, you can statically configure each MAC address on each port or allow the port to continuously learn new MAC addresses after restarts or interface-down events. Allowing the port to continuously learn MAC addresses represents a security risk. While a switch is restarting or an interface is coming back up, there might be a short delay before the interface can learn more MAC addresses. This delay occurs while the system re-enters previously learned persistent MAC addresses into the forwarding database for the interface.

Interfaces must be configured in access mode use the port-mode configuration statement or, for switches operating on the Enhanced Layer 2 Software ELS configuration style, the interface-mode configuration statement.

Switchport Port Security Explained With Examples

You cannot enable persistent MAC learning on an interface on which You cannot enable persistent MAC learning on an interface that is part of a redundant trunk group. You cannot enable persistent MAC learning on an interface on which no-mac-learning is enabled. If you move a device within your network that has a persistent MAC address entry on the switch, use the clear ethernet-switching table command to clear the persistent MAC address entry from the interface.

If you move the device and do not clear the persistent MAC address from the original port it was learned on, then the new port will not learn the MAC address of the device and the device will not be able to connect. 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.

Cisco CCNA – Port Security and Configuration

Two ways to approach this: no switchport port-security mac-address sticky Or switchport port-security mac-address Your config shows a max of 5 sticky mac's. Do you show five there? You could if you wanted to, strip the interface down to a bare interface and then re-add the switchport port security lines if what "Network Guy" say doesn't work. I will say this is the long way to do solve your problem. The other thing that just came to mind is maybe you have a dynamic sticky mac instead of a static one. I was wrong.

The commands you posted should let the port work. We manage the network ad we set the policy.


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The previous IT folks did not have anything established. That is something that I will have to work on, but not just now. Yes it's configured for a Max of 5 sticky MACs then reset the count.

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How to configure Port Security (mac sticky) on Cisco Switches

Dynamic sticky? The reason I ask regarding policy is because if there's nothing established right now that requires port security being enabled, I would disable it for now until you understand what is going on, then work from there. Plug in a laptop in that port again, wait for it to come down, then do sh int statu err-di again. The config on that port should let the laptop connect as is.


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  • Only other thing I would imagine is wrong is the vlan not existing on the switch.