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Replacing Host Subsystem Components

To replace a host subsystem, use the following procedures:

Taking the Host Subsystem Offline

The host subsystem is taken offline and brought online as a unit. Before you replace an SCB or a Routing Engine, you must take the host subsystem offline. Taking the host subsystem offline causes the device to shut down.

To take the host subsystem offline:

  1. On the console or other management device connected to the Routing Engine that is paired with the SCB you are removing, enter CLI operational mode and issue the following command. The command shuts down the Routing Engine cleanly, so its state information is preserved:

    user@host> request system halt

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

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

Replacing an SCB

The services gateway can have up to two SCBs. They are located in the front of the chassis in the slots marked 0 and 1. With a Routing Engine installed, the SCB weighs approximately 9.6 lb (4.4 kg).

Before you replace an SCB or a Routing Engine, you must power off the services gateway (see Powering Off the Services Gateway). To replace an SCB, use the following procedures:

Operating and Positioning the SCB Ejectors

Removing an SCB

To remove an SCB (see Figure 48):

Note: The SCB and Routing Engine are removed as a unit. You can also remove the Routing Engine separately.

  1. Power off the device. See Powering Off the Services Gateway.
  2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
  3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Preventing Electrostatic Discharge Damage.
  4. Rotate the ejector handles simultaneously counterclockwise to unseat the SCB.
  5. Grasp the ejector handles and slide the SCB about halfway out of the chassis.
  6. Place one hand underneath the SCB to support it and slide it completely out of the chassis.
  7. Place the SCB on the antistatic mat.
  8. If you are not replacing the SCB now, install a blank panel over the empty slot.

Figure 48: Removing an SCB

Image g030247.gif

Installing an SCB

To install an SCB (see Figure 49):

  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. For more information about ESD, see Preventing Electrostatic Discharge Damage.
  2. Power off the device as described in Powering Off the Services Gateway.
  3. Carefully align the sides of the SCB with the guides inside the chassis.
  4. Slide the SCB into the chassis until you feel resistance, carefully ensuring that it is correctly aligned.
  5. Grasp both ejector handles and rotate them simultaneously clockwise until the SCB is fully seated.
  6. Place the ejector handles in the proper position, vertically and toward the center of the board.
  7. Power on the services gateway as described in Powering On an AC-Powered Services Gateway or Powering On a DC-Powered Services Gateway. The OK LED on the power supply faceplate should blink, then light steadily.
  8. To verify that the SCB is functioning normally, check the LEDs on its faceplate. The green OK/FAIL LED should light steadily a few minutes after the SCB is installed. If the OK/FAIL LED is red, remove and install the SCB again (see Removing an SCB and Installing an SCB). If the OK/FAIL LED still lights steadily, the SCB is not functioning properly. Contact your customer support representative.

    To check the status of the SCB:


    user@host> show chassis environment cb
    CB 0 status:
      State                      Online Master
      Temperature                30 degrees C / 86 degrees F
      Power 1
        1.2 V                     1202 mV
        1.5 V                     1511 mV
        1.8 V                     1798 mV
        2.5 V                     2481 mV
        3.3 V                     3306 mV
        5.0 V                     4956 mV
        12.0 V                   12084 mV
        1.25 V                    1250 mV
        3.3 V SM3                 3287 mV
        5.0 V RE                  5046 mV
        12.0 V RE                11910 mV
      Power 2
        11.3 V bias PEM          11292 mV
        4.6 V bias MidPlane       4833 mV
        11.3 V bias FPD          11156 mV
        11.3 V bias POE 0        11253 mV
        11.3 V bias POE 1        11272 mV
      Bus Revision               42
      FPGA Revision              1
    CB 1 status:
      State                      Online
      Temperature                31 degrees C / 87 degrees F
      Power 1
        1.2 V                     1205 mV
        1.5 V                     1508 mV
        1.8 V                     1817 mV
        2.5 V                     2507 mV
        3.3 V                     3306 mV
        5.0 V                     5053 mV
        12.0 V                   12200 mV
        1.25 V                    1256 mV
        3.3 V SM3                 3306 mV
        5.0 V RE                  5091 mV
        12.0 V RE                    0 mV
      Power 2
        11.3 V bias PEM          11214 mV
        4.6 V bias MidPlane       4821 mV
        11.3 V bias FPD          11350 mV
        11.3 V bias POE 0        11350 mV
        11.3 V bias POE 1        11330 mV
      Bus Revision               42
      FPGA Revision              0

Figure 49: Installing an SCB

Image g030248.gif

Replacing a Routing Engine

The routing engine is located within the SCBs in the slots located at the horizontally along the bottom of the chassis marked 0 or 1. .

To replace the Routing Engine, perform the following procedures:

Removing a Routing Engine

Caution: Before you replace a Routing Engine, you must power off the device. See Powering Off the Services Gateway.

To remove a Routing Engine (see Figure 50):

  1. Power off the device. See Powering Off the Services Gateway.
  2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
  3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Preventing Electrostatic Discharge Damage.
  4. Loosen the captive screws at each end of the Routing Engine faceplate.
  5. Flip the ejector handles outward to unseat the Routing Engine.
  6. Grasp the Routing Engine by the ejector handles and slide it about halfway out of the chassis.
  7. Place one hand underneath the Routing Engine to support it and slide it completely out of the chassis.
  8. Place the Routing Engine on the antistatic mat.

    Note: To maintain proper airflow through the chassis, do not leave an SCB installed in the chassis without a Routing Engine for extended periods of time. If a Routing Engine is removed, a replacement Routing Engine should be installed as soon as possible.

Figure 50: Removing a Routing Engine

Image g030250.gif

Installing a Routing Engine

To install a Routing Engine into an SCB (see Figure 51):

  1. If you have not already done so, power off the device. See Powering Off the Services Gateway.
  2. Ensure that the ejector handles are not in the locked position. If necessary, flip the ejector handles outward.
  3. Place one hand underneath the Routing Engine to support it.
  4. Carefully align the sides of the Routing Engine with the guides inside the opening on the SCB.
  5. Slide the Routing Engine into the SCB until you feel resistance, and then press the Routing Engine's faceplate until it engages the connectors.
  6. Press both of the ejector handles inward to seat the Routing Engine.
  7. Tighten the captive screws on the left and right of the Routing Engine.
  8. Power on the services gateway as described in Powering On an AC-Powered Services Gateway or Powering On a DC-Powered Services Gateway. The OK LED on the power supply faceplate should blink, then light steadily.

The Routing Engine might require several minutes to boot.

After the Routing Engine boots, verify that it is installed correctly by checking the RE0 and RE1 LEDs on the craft interface. If the services gateway is operational and the Routing Engine is functioning properly, the green ONLINE LED lights steadily. If the red FAIL LED lights steadily instead, remove and install the Routing Engine again (see Removing a Routing Engine and Installing a Routing Engine). If the red FAIL LED still lights steadily, the Routing Engine is not functioning properly. Contact your customer support representative.

To check the status of the Routing Engine, use the CLI command:


user@host> show chassis routing-engine
Routing Engine status:      Slot 0:     Current state                 Master ...   

For more information about using the CLI, see the JUNOS software manuals.

Figure 51: Installing a Routing Engine

Image g030249.gif

Replacing Connections to Routing Engine Interface Ports

The ports on the Routing Engine connect it to external management devices (see Figure 52).

Figure 52: Routing Engine Interface Ports

Image g004034.gif

 

To replace the cables that connect to the ports, perform the procedures described in the following sections:

Replacing the Management Ethernet Cable

To connect the Routing Engine to a network for out-of-band management, connect an Ethernet cable with RJ-45 connectors to the ETHERNET port on the Routing Engine. One such cable is provided with the device. For cable specifications, see Routing Engine Interface Cable and Wire Specifications. Follow this procedure:

  1. Press the tab on the connector and pull the connector straight out of the port. Figure 53 shows the connector.
  2. Disconnect the cable from the network device.
  3. Plug one end of the replacement cable into the ETHERNET port. Figure 52 shows the external device ports on the Routing Engine.
  4. Plug the other end of the cable into the network device.

Figure 53: Cable Connectors

Image g003781.gif

Replacing the Console or Auxiliary Cable

To use a system console to configure and manage the Routing Engine, connect it to the CONSOLE port on the Routing Engine. To use a laptop, modem, or other auxiliary device, connect it to the AUX port on the Routing Engine. Both ports accept a cable with an RJ-45 connector. One RJ-45/DB-9 cable is provided with the device. If you want to connect a device to both ports, you must supply another cable. For cable specifications, see Routing Engine Interface Cable and Wire Specifications.

To connect a management console or auxiliary device:

  1. Turn off the power to the console or auxiliary device.
  2. Press the tab on the connector and pull the connector straight out of the port.
  3. Disconnect the cable from the console or auxiliary device.
  4. Plug one end of the replacement Ethernet cable into the CONSOLE or AUX port. Figure 52 shows the external device ports on the Routing Engine.
  5. Plug the female DB-9 end into the console or auxiliary device's serial port.

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