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Replacing a T4000 Routing Engine

 

The router can have one or two Routing Engines. They are located in the upper rear of the chassis in the slots marked RE0 and RE1. Each Routing Engine can weigh up to 2.4 lb (1.1 kg). The backup Routing Engine is hot-removable and hot-insertable.

Caution

Before you replace a Routing Engine, you must take the host subsystem offline. If there is only one host subsystem, taking the host subsystem offline shuts down the router. If the Routing Engine to be replaced is currently functioning as the master Routing Engine, switch it to be the backup before removing it.

  1. Taking the Host Subsystem Offline

  2. Removing a T4000 Routing Engine

  3. Installing a T4000 Routing Engine

Taking the Host Subsystem Offline

To take a 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:
    • Check the Routing Engine LEDs on the craft interface. If the green MASTER LED is lit, the corresponding host subsystem is functioning as the master.

    • Use the show chassis routing-engine command to determine which Routing Engine is the master. In this example, the master Routing Engine in Slot 0 is designated Master in the Current state field:

      user@host> show chassis routing-engine
  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
  3. To halt the router:
    user@host> request system halt

    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.

    Note

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

Removing a T4000 Routing Engine

To remove a Routing Engine (see Figure 2):

  1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
  2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  3. Loosen the captive screws on the corners of the Routing Engine cover.
  4. Grasp the Routing Engine cover by its edges, and pull it free from the chassis (see Figure 1).
  5. If applicable, loosen the screws on the extractor handles at either end of the Routing Engine faceplate, using a Phillips screwdriver.
  6. Press the red tabs on the ejector handles on both sides of the Routing Engine faceplate.
  7. Flip the ejector handles outward to unseat the Routing Engine.
  8. Grasp the Routing Engine by the ejector handles, and slide it about halfway out of the chassis.
  9. Place one of your hands underneath the Routing Engine to support it, and slide it completely out of the chassis.
  10. Place the Routing Engine on the antistatic mat.
  11. If you are not replacing the Routing Engine now, reinstall the Routing Engine cover, and tighten the screws on the corners of the cover to secure it to the chassis.
Figure 1: Removing the Routing Engine Cover
Removing the Routing
Engine Cover
Figure 2: Removing a T4000 C1800 Routing Engine
Removing a T4000 C1800
Routing Engine

Installing a T4000 Routing Engine

To install a Routing Engine (see Figure 3):

  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. Ensure that the ejector handles are not in the locked position. If necessary, press the red tabs and flip the ejector handles outward.
  3. Place one hand underneath the Routing Engine to support it. With the other hand, grasp one of the ejector handles on the faceplate.
  4. Carefully align the sides of the Routing Engine with the guides inside the chassis.
  5. Slide the Routing Engine into the chassis until you feel resistance, then press the Routing Engine's faceplate until it engages the midplane connectors.
  6. Press both the ejector handles inward to seat the Routing Engine.

    The Routing Engine might require several minutes to boot.

  7. If applicable, tighten the screws on the extractor handles, by using a Phillips screwdriver. Be sure to tighten the screws enough to seat the Routing Engine properly.
  8. Press the Routing Engine cover into place, then tighten the captive screws on the corners of the cover to secure it to the chassis (see Figure 4).
Figure 3: Installing a Routing Engine
Installing a Routing Engine
Figure 4: Reinstalling the Routing Engine Cover
Reinstalling the Routing
Engine Cover