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The answer is that UDLD will change the port state to err-disable. This is a message that means that the port will automatically be disabled from the Cisco Catalyst switch. Take note that when a port is shut down, this means that the port will not receive anything. It will not be able to send details as well.

Take note that if this is not induced, there are various methods that can be done in order for the port to recover from this error message. The faster that this issue is solved, the more that the port can be used again to receive and send traffic again.