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Troubleshooting Commands and Outputs
Troubleshooting Commands and Outputs
show interface serial 0Serial 0 is Up / Line protocol is up: Interface is working.
Serial 0 is Up / Line protocol is down: Layer 1 is up, Layer 2 is down (clocking or mismatching frame types).
Serial 0 is Down / Line protocol is down: Layer 1 down. (Fault or remote end is shut down.)
Administratively down/Line protocol is down: Interface is shut down and must be no shut.
