ac failure or link failure

niba10

hey i have some question how i can tell the cause of
a switch / router went down by ac power or his links went down ?
it possible?

OctalDump

Are there lights on? Are cables still connected?

Also, checking uptime will tell you how long since last power on.

EdTheLad

"show version" will tell you the uptime of a device i.e you will know if it reloaded. Check the logs to see if a link went down, "show log".

niba10

oh sorry i mean how i can detect it from telnet /ssh

shortstop20

Login to the switch.

Type "show version".