What causes port security violation?

A security violation occurs when the maximum number of MAC addresses has been reached and a new device, whose MAC address is not in the address table attempts to connect to the interface or when a learned MAC address on an interface is seen on another secure interface in the same VLAN.

What are common causes of port security violations?

A security violation occurs if the maximum number of secure MAC addresses have been added to the address table and the port receives traffic from a MAC address that is not in the address table. You can configure the port for one of three violation modes: protect, restrict, or shutdown.

How do I check my port security violations?

Here is a useful command to check your port security configuration. Use show port-security interface to see the port security details per interface. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.

How do I enable ports after security violation?

One method to enable back an interface, after a Port Security violation related shutdown (Errdisable state) is to bring the interface down and again up by issuing the commands “shutdown” and “no shutdown”. Other method is to bring up the switch port automatically after a period of time in Errdisable state.

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What is port security violation?

If the maximum number of secure MAC addresses has been reached, a security violation occurs when a devices with a different MAC addresses tries to attach to that port. In most of today’s scenarios when the switch detects a security violation, the switch automatically shuts down that port.

Can we configure port security on trunk ports?

Port security supports trunks. –On a trunk, you can configure the maximum number of secure MAC addresses both on the trunk and for all the VLANs on the trunk. –You can configure the maximum number of secure MAC addresses on a single VLAN or a range of VLANs.

What is the benefit of port security?

Port Security Benefits

Allows for limiting the number of MAC addresses on a given port. Packets that have a matching MAC address (secure packets) are forwarded; all other packets (unsecure packets) are restricted. Enabled on a per port basis. When locked, only packets with allowable MAC address will be forwarded.

What is the purpose of port security?

Port Security helps secure the network by preventing unknown devices from forwarding packets. When a link goes down, all dynamically locked addresses are freed. The port security feature offers the following benefits: You can limit the number of MAC addresses on a given port.

Which two of the following switch port violation modes will alert you via SNMP that a violation has occurred on a port?

Shutdown and protect mode will alert you via SNMP that a violation has occurred on a port.

How do I disable port security?

To disable port security aging for all secure addresses on a port, use the no switchport port-security aging time interface configuration command.

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Which subcommand overrides the default action to take upon a security violation?

4. (Optional) Use the switchport port-security violation {protect | restrict | shutdown} interface subcommand to override the default action to take upon a security violation (shutdown).