The type of port adapter that you use determines which of the various Cisco IOS® software commands display the E3 error events. Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command.
All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. A section is also provided on Hard Plug Loopback Tests. This document describes the different E3 error events and outlines how to identify and troubleshoot them.
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