Maintaining the M320 Host Subsystem

Purpose

For optimum router performance, verify the condition of the host subsystem. The host subsystem comprises a Routing Engine and up to two adjacent CBs functioning together.

Action

On a regular basis:

• Check the host subsystem LEDs (RE0 and RE1) on the craft interface. If the red RE0 or RE1 LED is lit, look at the LED display to get more information about the cause of the problem. For more information about the LEDs and the display, see M320 Craft Interface Description.
• Check the LED display on the craft interface to view information about the router temperature and the status of the Routing Engines.
• Check the LEDs on the CB faceplate to see information about the CB.
• To check the status of the Routing Engines, issue the show chassis routing-engine command. The output is similar to the following:
  user@host> show chassis routing-engine

  Routing Engine status:
      Slot 0:
        Current state                  Backup
        Election priority              Master (default)
        Temperature                 50 degrees C / 122 degrees F
        DRAM                      2048 MB
        Memory utilization          10 percent
        CPU utilization:
          User                      25 percent
          Background                 0 percent
          Kernel                    38 percent
          Interrupt                  4 percent
          Idle                      33 percent
        Model                          RE-4.0
        Serial ID                      212058900125
        Start time                     2003-09-30 16:34:15 PDT
        Uptime                         18 hours, 57 minutes, 9 seconds
    Routing Engine status:
      Slot 1:
        Current state                  Master
        Election priority              Backup (default)
        Temperature                 29 degrees C / 84 degrees F
        DRAM                      2048 MB
        Memory utilization          11 percent
        CPU utilization:
          User                       0 percent
          Background                 0 percent
          Kernel                     1 percent
          Interrupt                  0 percent
          Idle                      99 percent
        Model                          RE-4.0
        Serial ID                      212047100107
        Start time                     2003-09-30 13:04:27 PDT
        Uptime                         22 hours, 27 minutes, 8 seconds
        Load averages:                 1 minute   5 minute  15 minute
                                         0.01       0.01       0.00

• To check the status of the CBs, issue the show chassis environment cb command. The output is similar to the following:
  user@host> show chassis environment cb

  CB 0 status:
     State                           Online Standby
     Temperature                  33 degrees C / 91 degrees F
     Power:
       1.8 V                    1816 mV
       2.5 V                    2477 mV
       3.3 V                    3278 mV
       4.6 V                    4615 mV
       5.0 V                    5023 mV
       12.0 V                  11511 mV
       3.3 V bias               3286 mV
       8.0 V bias               7257 mV
     BUS Revision                 16
     FPGA Revision                39
   CB 1 status:
     State                           Online Master
     Temperature                  28 degrees C / 82 degrees F
     Power:
       1.8 V                    1809 mV
       2.5 V                    2471 mV
       3.3 V                    3304 mV
       4.6 V                    4610 mV
       5.0 V                    5003 mV
       12.0 V                  11555 mV
       3.3 V bias               3301 mV
       8.0 V bias               7413 mV
     BUS Revision                 12
     FPGA Revision                15

For more information about using the CLI, see the Junos OS manuals.