(I will show only the serial interface's configurations, if you need the full router's configurations, please let me know). Serial0 is up, line protocol is down. FastEthernet0 is up, line protocol is down. However if you repeat the same No shut command on a serial interface it with no cable attached it will show as Down.

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By To effectively identify and troubleshoot any problem, including those with your serial connections, you must have the key information about the devices or services you are troubleshooting. There are some show and debug commands you can use to identify configuration or flow issues with serial connections.

Easy Way To Patch A Popcorn Ceiling. Showing The show command displays the configuration and status of your serial ports. In the following code, the items that stand out the most are the line protocols that are reported as down, meaning that the physical connection to the device at the other end of the connection is not established, as well as the encapsulation protocol that is in use, such as HDLC or PPP.