Removing a Routing Engine from an M10i Router

To remove a Routing Engine (see Figure 10):

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 ...  

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

   The backup Routing Engine immediately assumes Routing Engine functions. If graceful switchover and nonstop routing are configured, packet forwarding and routing are continued without interruption. If the Routing Engines are configured for graceful switchover, but nonstop routing is not configured, there is no interruption to packet forwarding, but routing is interrupted momentarily. If neither graceful switchover nor nonstop routing is configured, packet forwarding halts while the backup 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 and nonstop routing, see the section about Routing Engine redundancy in the JUNOS System Basics Configuration Guide.

   We recommend that you run JUNOS Release 7.0 or later on the M10i router to support graceful switchover.

   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 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 System Basics and Services Command Reference.

   Note: The router might continue forwarding traffic for a few 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. Verify that the router is attached to a proper earth ground.
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 10: Removing a Routing Engine from an M10i Router