Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Maintaining MX2020 MPCs



The router can have up to 20 Modular Port Concentrators (MPCs) mounted vertically in the MPC card cage at the front of the chassis. For optimum router performance, verify the condition of the MPCs.


On a regular basis:

  • Check the LEDs on the craft interface directly above each MPC slot. The green LED labeled OK lights steadily when a MPC is functioning normally.

  • Check the OK/FAIL LED on the MPC. For more information, see MX Series Interface Module Reference. If the MPC detects a failure, the MPC sends an alarm message to the Routing Engine.

  • Check the status of installed MPCs by issuing the CLI show chassis fpc command to check the status of installed MPCs. As shown in the sample output, the value Online in the column labeled State indicates that the MPC is functioning normally:

    user@host> show chassis fpc

    For more detailed output, add the detail option. The following example does not specify a slot number, which is optional:

    user@host> show chassis fpc detail
  • Issue the CLI show chassis fpc pic-status command. The MPC slots are numbered from 0 through 9 (bottom), and 10 through 19 (top), left to right:

    user@host> show chassis fpc pic-status

    For further description of the output from the command, see the Junos OS System Basics and Services Command Reference  .