Every now and then you’ll have to use this command to verify Power Supply and other system environmental status.

ROUTER#sh environment all
SYSTEM POWER SUPPLY STATUS
==========================
Internal Power Supply 1 Type: AC
Internal Power Supply 1 Input Status and 12V Output Status: Fail

Internal Power Supply 2 Type: AC
Internal Power Supply 2 12V Output Status: Normal

SYSTEM FAN STATUS
=================
Fan 1 OK, Low speed setting
Fan 2 OK, Low speed setting
Fan 3 OK, Low speed setting
Fan 4 OK, Low speed setting
Fan 5 OK, Low speed setting

SYSTEM TEMPERATURE STATUS
=========================
Intake Left temperature: 25 Celsius, Normal
Intake Right temperature: 24 Celsius, Normal
Exhaust Right temperature: 24 Celsius, Normal
Exhaust Left temperature: 26 Celsius, Normal
CPU temperature: 55 Celsius, Normal
Power Supply Unit 2 temperature: 27 Celsius, Normal

REAL TIME CLOCK BATTERY STATUS
==============================
Battery OK (checked at power up)

SYSTEM POWER
===============
Motherboard Components Power consumption = 100.8 WPower consumption =
NM/SM slot 4 43.1 W
Total System Power consumption is: 143.9 W

Environmental information last updated 00:00:20 ago