Cisco ASA Audit Event: 216005

216005: Duplex mismatch resulted in transmitter backup

Cisco ASA is a security device that provides the combined capabilities of a firewall, an antivirus, and an intrusion prevention system. It also facilitates virtual private network (VPN) connections.It helps to detect threats and stop attacks before they spread through the network.

Message: %ASA-1-216005:ERROR: Duplex-mismatch on interface_name resulted in transmitter lockup. A soft reset of the switch was performed.

Event 216005 is generated when a duplex mismatch on the port causes a problem in which the port can no longer transmit packets. This message applies only to the ASA 5505. The interface name that had been locked up is specified in the message.

How could you resolve this situation?

Correct the duplex mismatch by either setting both devices to autor ecover or hard coding the duplex mismatch for both devices to be the same.

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