Taking the Host Subsystem Offline

1. Determine whether the host subsystem is functioning as the master or as the backup, using one of the two following methods:
   • If the green MASTER LED on the Routing Engine is lit, the corresponding host subsystem is functioning as the master.
   • Issue the following CLI command. The master Routing Engine is designated Master in the Current state field:
     user@host> show chassis routing-engine sfc 0

     sfc0-re0:
     --------------------------------------------------------------------------
     Routing Engine status:
       Slot 0:
         Current state                  Master
         Election priority              Master (default)
         Temperature                 27 degrees C / 80 degrees F
         CPU temperature             42 degrees C / 107 degrees F
         DRAM                      3327 MB
         Memory utilization          12 percent
         CPU utilization:
           User                       0 percent
           Background                 0 percent
           Kernel                     2 percent
           Interrupt                  0 percent
           Idle                      98 percent
         Model                          RE-TXP-SFC
         Serial ID                      737A-1024
         Start time                     2009-05-11 17:39:49 PDT
         Uptime                         3 hours, 45 minutes, 25 seconds
         Last reboot reason             Router rebooted after a normal shutdown.
         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                 29 degrees C / 84 degrees F
         CPU temperature             43 degrees C / 109 degrees F
         DRAM                      3327 MB
         Memory utilization          11 percent
         CPU utilization:
           User                       0 percent
           Background                 0 percent
           Kernel                     0 percent
           Interrupt                  0 percent
           Idle                     100 percent
         Model                          RE-TXP-SFC
         Serial ID                      737A-1024
         Start time                     2009-05-11 17:08:54 PDT
         Uptime                         4 hours, 16 minutes, 52 seconds
         Last reboot reason             0x1:power cycle/failure 
     

2. If the host subsystem is functioning as the master, switch it to backup using the CLI command:
   user@host> request chassis routing-engine master switch sfc 0

   warning: Traffic will be interrupted while the PFE is re-initialized
   Toggle mastership between Routing Engines ? [yes,no] (no) yes 
   
   Resolving mastership...
   Complete. The other Routing Engine becomes the master.
   

   If the Routing Engines are running the same Junos OS Release and are configured for graceful switchover, the standby Routing Engine immediately assumes Routing Engine functions and there is no interruption to packet forwarding. Otherwise, packet forwarding halts while the standby Routing Engine becomes the master and the Packet Forwarding Engine components reset and connect to the new master Routing Engine. For information about configuring graceful switchover, see the Junos OS High Availability Configuration Guide .

   Note: TX Matrix Plus router performance might change if the standby Routing Engine's configuration differs from the former master's configuration. For the most predictable performance, configure the two Routing Engines identically, except for parameters unique to a Routing Engine, such as the hostname defined at the [edit system] hierarchy level and the management interface (em0 or equivalent) defined at the [edit interfaces] hierarchy level. To configure Routing Engine-specific parameters and still use the same configuration on both Routing Engines, include the appropriate configuration statements under the re0 and re1 statements at the [edit groups] hierarchy level and use the apply-groups statement. For instructions, see the Junos OS System Basics Configuration Guide .

3. To halt the router:
   user@host> request system halt sfc 0

   Halt the system ? [yes,no] (no) yes
   
   *** FINAL System shutdown message from user@host ***
   System going down IMMEDIATELY
   Terminated
   ...
   syncing disks... 11 8 done
   The operating system has halted.
   Please press any key to reboot.
   

   Note: The request system halt sfc 0 command halts all Routing Engines on the control plane from which it was issued. To reboot a Routing Engine that has been halted, you must connect through the console. For more information about system commands, see the Junos OS System Basics and Services Command Reference .

   (If two Routing Engines are installed, also issue the command on the backup Routing Engine.) Wait until a message appears on the console confirming that the operating system has halted.

   The command shuts down the Routing Engine cleanly, so its state information is preserved. For more information about the command, see the Junos OS System Basics and Services Command Reference .

   Note: The TXP-F13 SIBs might continue forwarding traffic for approximately five minutes after the request system halt command has been issued.