does port security dynamically learn mac addresses without sticky

Port Security restricts a port’s ingress traffic by limiting the MAC addresses that are allowed to send traffic into the port. “Sticky learning” combines dynamically learned and statically configured addresses. Port security is configured on untrusted user ports. You can use port security with dynamically learned and static MAC addresses. It’s a Cisco-proprietary feature on Catalyst switches (disabled by default). Enabling port security limits MAC flooding attacks and locks down the port.Ĭonfigure port security to define the number of MAC addresses allowed on a given port. To prevent MAC Address flooding, Port Security can be used. Once MAC addresses are assigned to a secure port, the port does not forward frames with source MAC addresses outside the group of defined addresses. Port Security on interfaces that use voice VLANsīy limiting the number of permitted MAC addresses on a port, port security can be used to control unauthorized expansion of the network. Mitigating MAC Spoofing and MAC Table Overflow Attacks Is there someone who already experience this kind of bug and, is there a different way to disable sticky learning without upgrading the IOS on all my switches. I dosent find any issue on the cisco website. I have change the IOS for 12.2-40 and it seem to solve the problem. So the port stay in Err-disable mode until we deactivate the port-security or, change the default of the port-security option from 1 to 2 mac. Even clear port-security sticky Dosent work. The mac address change but, I am not able to reset the sticky learning for the new mac. The problem occur when we change the network card or the device itself. Usually, we use sticky learning for printers and a maximum of one mac address. Switchport port-security mac-address sticky Here is an example of my port configuration. I am working on a 3560 series switch with 12.2-25 SEE1 IOS image. I have some trouble releasing the mac-address learned sticky on an interface.

Does port security dynamically learn mac addresses without sticky