Maintaining Host Module Components

The router can have a Routing Engine in each of the slots labeled RE 0 and RE 1 and a Miscellaneous Control Subsystem (MCS) in each of the slots labeled MCS 0 and MCS 1 at the rear of the chassis, as shown in Figure 3. Each paired Routing Engine and MCS function together as a host module. To maintain the host module, perform the following procedures regularly:

• Check the LCD and the host module LEDs on the craft interface. The LCD reports host module status during normal operation and describes the cause of failures when they occur. The green LEDs labeled ONLINE and MASTER light steadily for the master host module when it is functioning normally. The ONLINE LED also lights for the standby host module if it is installed. For more information about the LEDs and LCD, see Craft Interface.
• Issue the CLI show chassis routing-engine command to check the status of the Routing Engines. As shown in the sample output, the master Routing Engine is designated Master in the Current state field:
  user@host> show chassis routing-engine

  Routing Engine status:
    Slot 0:
      Current state            Master
      Election priority        Master (default)
      Temperature           37 degrees C / 98 degrees F
      DRAM                 768 MB
      Memory utilization    18 percent
      CPU utilization:
        User                 0 percent
        Background           0 percent
        Kernel               2 percent
        Interrupt            0 percent
        Idle                98 percent
      Model                    RE-2.0
      Serial ID                8b00000792898b01
      Start time               2003-04-29 16:09:49 PDT
      Uptime                   16 days, 3 hours, 6 minutes, 34 seconds
      Load averages:           1 minute   5 minute  15 minute
                                   0.00       0.00       0.00
  Routing Engine status:
    Slot 1:  
      Current state            Backup
      Election priority        Backup (default)
      Temperature           36 degrees C / 96 degrees F
      DRAM                 768 MB
      Memory utilization    16 percent
      CPU utilization:
        User                 0 percent  
        Background           0 percent 
        Kernel               0 percent 
        Interrupt            0 percent 
        Idle               100 percent 
      Model                    RE-2.0 
      Serial ID                6d000007c8150801 
      Start time               2003-04-22 10:01:29 PDT 
      Uptime                   16 days, 3 hours, 6 minutes, 34 seconds
  
   

• Issue the CLI show chassis environment mcs command to check the status of the MCSs. As shown in the sample output, the MCS that belongs to the master host module is designated Master in the State field:
  user@host> show chassis environment mcs

  MCS 0 status:
    State                           Online Master   
    Temperature                 48 degrees C / 118 degrees F
    Power:
      3.3 V                   3299 mV
      5.0 V                   4971 mV
      12.0 V                 11770 mV
      5.0 V bias              4989 mV
      8.0 V bias              8246 mV
    BUS Revision                12
    FPGA Revision               13
  MCS 1 status:
    State                           Online Standby
    Temperature                  51 degrees C / 123 degrees F
    Power:
      3.3V                    3316 mV
      5.0 V                   5001 mV
      12.0 V                 11775 mV
      5.0 V bias              5001 mV
      8.0 V bias              8249 mV
    BUS Revision                12
    FPGA Revision               13
   

For further description of the output from the commands, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.