• Supported Platforms
• M120 Routers

• Related Topics
• M120 Router Chassis Description
• M120 Host Subsystem Description
• Taking the M120 Host Subsystem Offline
• Replacing an M120 CB
• Replacing an M120 Routing Engine

Maintaining the M120 Host Subsystem

Purpose

For optimum router performance, verify the condition of the host subsystem. The host subsystem comprises a Routing Engine installed directly into a CB.

Action

On a regular basis:

• Check the LEDs on the craft interface to view information about the status of the Routing Engines. For more information about the LEDs and the display, see M120 Craft Interface Description.
• Check the LEDs on the CB faceplate to see information about them.
• Check the LEDs on the Routing Engine faceplate to see information about them.
• 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

  Routing Engine status:
      
    Slot 0:
      Current state                  Master
      Election priority              Master (default)
      Temperature                 56 degrees C / 132 degrees F
      CPU temperature             63 degrees C / 145 degrees F
      DRAM                      3584 MB
      Memory utilization          12 percent
      CPU utilization:
        User                       0 percent
        Background                 0 percent
        Kernel                     6 percent
        Interrupt                  0 percent
        Idle                      93 percent
      Model                          RE-A-2000
      Serial ID                      1000642871
      Start time                     2006-08-29 10:06:11 PDT
      Uptime                         57 minutes, 49 seconds
      Load averages:                 1 minute   5 minute  15 minute
                                         0.00       0.03       0.00
  Routing Engine status:
    Slot 1:
      Current state                  Backup
      Election priority              Backup (default)
      Temperature                 45 degrees C / 113 degrees F
      CPU temperature             52 degrees C / 125 degrees F
      DRAM                      3584 MB
      Memory utilization          10 percent
      CPU utilization:
        User                       0 percent
        Background                 0 percent
        Kernel                     0 percent
        Interrupt                  0 percent
        Idle                     100 percent
      Model                          RE-A-2000
      Serial ID                      1000636825
      Start time                     2006-08-29 09:34:59 PDT
      Uptime                         1 hour, 28 minutes, 51 seconds

• 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 Master
    Temperature                67 degrees C / 152 degrees F
    Power
      1.2 V                     1218 mV
      1.5 V                     1498 mV
      2.5 V                     2520 mV
      3.3 V                     3332 mV
      5.0 V                     5066 mV
      3.3 V bias                3296 mV
    Bus Revision               15
    FPGA Revision              20
  CB 1 status:
    State                      Online Standby
    Temperature                66 degrees C / 150 degrees F
    Power
      1.2 V                     1214 mV
      1.5 V                     1501 mV
      2.5 V                     2510 mV
      3.3 V                     3306 mV
      5.0 V                     5111 mV
      3.3 V bias                3296 mV
    Bus Revision               15
    FPGA Revision              20

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