Monitoring the Cooling System You monitor and maintain the cooling system to keep an acceptable operating temperature for the router chassis and its components. (See Table 67.) Table 67: Checklist for Monitoring the Cooling System Monitor Cooling System Tasks Command or Action Understanding the Cooling System M5 and M10 Router Cooling Systems M7i Router Cooling System M10i Router Cooling System M20 Router Cooling System M40 Router Cooling System M40e and M160 Router Cooling Systems M320 Router Cooling System T320 Router and T640 Routing Node Cooling Systems Checking the Cooling System Status show chassis environment Checking the Cooling System Alarms Check the Alarm Indicators on the Craft Interface show chassis craft-interface Check the router craft interface. Display Current Cooling System Alarms show chassis alarms Display Cooling System Error Messages in the System Log File show log messages | match fan Maintaining the Air Filter Inspect the air filter. If dirty, clean it; if damaged, replace it. Verifying a Fan Failure Perform a swap test on the fan. If defective, replace it without powering down the router. Verifying an Impeller Failure Feel the impeller air exhaust. If no airflow, replace without powering down the router. Replacing a Cooling System Component Follow the procedure in the appropriate router hardware guide.
You monitor and maintain the cooling system to keep an acceptable operating temperature for the router chassis and its components. (See Table 67.)
show chassis environment
show chassis craft-interface
Check the router craft interface.
show chassis alarms
show log messages | match fan
Inspect the air filter. If dirty, clean it; if damaged, replace it.
Perform a swap test on the fan. If defective, replace it without powering down the router.
Feel the impeller air exhaust. If no airflow, replace without powering down the router.
Follow the procedure in the appropriate router hardware guide.