Router#show interface serial 0/0 | Displays status and stats of interface |
Serial 0/0 is up, line protocol is up | First part refers to physical status. Second part refers to logical status |
...<output cut>... | |
Possible output results: | |
Serial 0/0 is up, line protocol is up | Interface is up and working |
Serial 0/0 is up, line protocol is down | Keepalive or connection problem (no clockrate, bad encapsulation) |
Serial 0/0 is down, line protocol is down | Interface problem, or other end has not been configured |
Serial 0/0 is administratively down, line protocol is down | Interface is disabledshut down |