Maintaining the MX2020 Cooling System Zones
Purpose
For optimum router performance, verify the status of the two cooling zones of the chassis. Both Zone 0 and Zone 1 cool the Control Board and Routing Engine (CB-RE). Zone 1 consist of ten MPCs (10 through 19) and their respective MICs, along with the top half of the CB-REs and SFBs. Zone 1 is cooled by fan trays 2 and 3. Zone 0 consists of ten MPCs (0 through 9), and their respective MICs, along with the bottom half of CB-REs and SFBs. Zone 0 is cooled by fan trays 0 and 1. Two fan trays are at the bottom of the chassis, and two fan trays are at the top of the chassis.
Action
On a regular basis:
Check the LEDs on the craft interface for upper and lower fan trays. The green status LEDs labeled 0 and 1, for lower fan trays, and 2 and 3 for the upper fan trays light steadily when a fan tray is functioning normally.
During normal operation:
The green LEDs next to the fan trays 0, 1, 2, and 3 on the craft interface light steadily when the fan tray is functioning normally for that zone.
Issue the
show chassis zonescommand to check the status of the two cooling zones. The output is similar to the following:
user@host> show chassis zones
ZONE 0 Status
Driving FRU FPC 9
Temperature 62 degrees C / 143 degrees F
Condition WARM TEMP
Num Fans Missing 0
Num Fans Failed 0
Fan Duty Cycle 30
ZONE 1 Status
Driving FRU FPC 19
Temperature 64 degrees C / 147 degrees F
Condition WARM TEMP
Num Fans Missing 0
Num Fans Failed 0
Fan Duty Cycle 30