Replacing the M10i Routing Engine

The Routing Engines are hot-pluggable, as described in M10i Field-Replaceable Units (FRUs). If two Routing Engines are installed, removal or failure of the backup Routing Engine does not affect router function. Removal or failure of the master Routing Engine affects forwarding and routing depending on your high availability configuration. For detailed information, see M10i Routing Engine Description. To replace a Routing Engine, perform the following procedures:

1. Removing the M10i Routing Engine
2. Installing the M10i Routing Engine

Removing the M10i Routing Engine

To remove a Routing Engine (see Figure 1):

1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
2. If two Routing Engines are installed, use one of the following two methods to determine which is functioning as master:
   • Note which of the blue MASTER LEDs is lit on the Routing Engine faceplates.
   • Issue the following CLI command. 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                 27 degrees C / 80 degrees F
         CPU temperature             27 degrees C / 80 degrees F
         DRAM                       768 MB
         Memory utilization          45 percent
         CPU utilization:
           User                       0 percent
           Background                 0 percent
           Kernel                     3 percent
           Interrupt                  0 percent
           Idle                      97 percent
         Model                          RE-5.0
         Serial ID                      1000647001
         Start time                     2009-01-28 14:11:50 PST
         Uptime                         21 hours, 51 minutes, 16 seconds
         Load averages:                 1 minute   5 minute  15 minute
                                            0.00       0.02       0.00
     
     Routing Engine status:
       Slot 1:
         Current state                  Backup
         Election priority              Backup (default)
         Temperature                 26 degrees C / 78 degrees F
         CPU temperature             27 degrees C / 80 degrees F
         DRAM                      1536 MB
         Memory utilization          23 percent
         CPU utilization:
           User                       0 percent
           Background                 0 percent
           Kernel                     0 percent
           Interrupt                  0 percent
           Idle                      99 percent
         Model                          RE-850
         Serial ID                      1000648260
         Start time                     2009-01-28 16:18:12 PST
         Uptime                         19 hours, 44 minutes, 51 seconds

3. If you are removing the master Routing Engine and a second Routing Engine is installed, issue the following CLI command to switch mastership to the backup host module:
   user@host> request chassis routing-engine master switch

   Note: Router performance might change if the backup 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 (fxp0 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.

4. On the console or other management device connected to the Routing Engine, enter CLI operational mode and issue the following command to shut down the router software cleanly and preserve Routing Engine state information.
   user@host> request system halt

   Note: Wait until a message appears on the console confirming that the operating system has halted.

   For more information about the command, see the Junos OS System Basics and Services Command Reference.

   Note: The CFEB might continue forwarding traffic for approximately 5 minutes after the request system halt command has been issued.

5. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
6. Loosen the thumbscrews located at each end of the Routing Engine faceplate, using a Phillips screwdriver if necessary.
7. Grasp the handle and slide the unit about halfway out of the chassis.

   Caution: Slide the Routing Engine straight out of the chassis. Damage can result if the Routing Engine gets lodged because of uneven movement.

8. Place one hand under the Routing Engine to support it, slide it completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.

Figure 1: Removing a Routing Engine

Installing the M10i Routing Engine

To install a Routing Engine (see Figure 2):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Place one hand under the Routing Engine to support it and grasp the handle on the faceplate with the other hand.
3. Align the rear of the Routing Engine with the guide rails inside the chassis and slide it in completely.

   Caution: Align the Routing Engine carefully with the guide rails and push it in evenly. Damage can result if the Routing Engine gets lodged in the rails because of uneven movement.

4. Tighten the thumbscrews on the Routing Engine faceplate to secure the Routing Engine.

   The Routing Engine might require several minutes to boot.

5. After the Routing Engine boots, issue the show chassis routing-engine command to verify correct Routing Engine functioning.

Figure 2: Installing a Routing Engine