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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 zones command to check the status of the two cooling zones. The output is similar to the following:

user@host> show chassis zones