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Maintaining MX480 Host Subsystem Components

 

Maintaining the MX480 Host Subsystem

Purpose

For optimum router performance, verify the condition of the host subsystem. The host subsystem comprises an SCB and a Routing Engine installed directly into an SCB.

Action

On a regular basis:

  • Check the LEDs on the craft interface to view information about the status of the Routing Engines.

  • Check the LEDs on the SCB faceplate.

  • Check the LEDs on the Routing Engine faceplate.

  • To check the status of the Routing Engines, issue the show chassis routing-engine command. The output is similar to the following:

    user@host> show chassis routing-engine
  • To check the status of the SCBs, issue the show chassis environment cb command. The output is similar to the following:

    user@host> show chassis environment cb

To check the status of a specific SCB, issue the show chassis environment cb command and include the slot number of the SCB. The output is similar to the following:

user@host> show chassis environment cb 0

For more information about using the CLI, see the Junos OS manuals.

Replacing an MX480 Routing Engine

  1. Removing an MX480 Routing Engine

  2. Installing an MX480 Routing Engine

Removing an MX480 Routing Engine

Before you remove a Routing Engine, remove the cables that connect to it.

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.

Caution

If the Routing Engine to be replaced is currently functioning as the master Routing engine, switch it to be the backup before removing it.

To remove a Routing Engine from an SCB (see Figure 1):

  1. Take the Routing Engine offline gracefully.
  2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
  3. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  4. Verify that the Routing Engine LEDs are off.
  5. Loosen the captive screws on the left and right of the Routing Engine.
  6. Flip the ejector handles outward to unseat the Routing Engine.
  7. Grasp the Routing Engine by the ejector handles, and slide it about halfway out of the chassis.
  8. Place one hand underneath the Routing Engine to support it, and slide it completely out of the chassis.
  9. 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 1: Removing a Routing Engine
Removing a Routing Engine

Installing an MX480 Routing Engine

To install a Routing Engine into an SCB (Figure 2):

  1. Attach an 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, 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.Caution

    Align the Routing Engine correctly to avoid damaging it.

  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. Connect the management device cables to the Routing Engine.

The Routing Engine might require several minutes to boot.

After the Routing Engine boots, verify that it is installed correctly by checking the FAIL, RE0, and RE1 LEDs on the craft interface. If the router 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. 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

For more information about using the CLI, see the Junos OS documentation.

Note

If enhanced IP network services is configured on the chassis, all routing engines must be rebooted after synchronizing the routing engines. For more information on synchronizing the routing engines, see Synchronizing Routing Engines.

Figure 2: Installing an MX480 Routing Engine
Installing an MX480
Routing Engine

Replacing an SSD Drive on an RE-S-1800

Each RE-S-1800 Routing Engine supports two solid-state drives (SSD) specified by Juniper Networks. The RE-S-1800 ships with one SSD installed in the slot labeled SATA SSD 1. The spare SSD is Juniper part number SSD-32G-RE-S. Figure 3 shows the arrangement of storage drive slots on a RE-S-1800 Routing Engine.

Figure 3: RE-S-1800 Storage Drive Slots
RE-S-1800 Storage Drive Slots

The following drive has been verified to work in the RE-S-1800 Routing Engine:

  • SSD-32G-RE-S

To replace a storage drive:

  1. Disable and deactivate the storage drive.
  2. Remove the storage drive.

    1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an ESD point on the appliance.

      For more information about ESD, see Preventing Electrostatic Discharge Damage in the hardware guide for your router.

    2. Unfasten the thumbscrew that secures the access door in front of the storage drive slots, and open the door.
    3. Slide the lock on the ejector to the unlocked position.
    4. Carefully slide the drive out of the slot.
  3. Reinstall a storage drive.

    1. Carefully align the sides of the drive with the guides in the slot.
    2. Slide the drive into the slot until you feel resistance, carefully ensuring that it is correctly aligned.
    3. Close the access door and tighten the thumbscrew to secure the door.

Replacing an SSD Drive on an RE-S-X6-64G

Each RE-S-X6-64G Routing Engine supports two solid-state drives (SSD) specified by Juniper Networks. The RE-S-X6-64G ships with two SSDs installed in the slot labeled DISK1 and DISK2. Figure 4 shows the arrangement of storage drive slots on a RE-S-X6-64G Routing Engine.

Replacing an SSD drive in a RE-S-X6-64G Routing Engine consists of the following two stages:

  1. Replacing the SSD Drive in the Routing Engine.

  2. Copying vmhost and Junos OS to the replaced SSD.

Figure 4: RE-S-X6-64G Storage Drive Slots
RE-S-X6-64G Storage Drive
Slots

The following drive has been verified to work in the RE-S-X6-64G Routing Engine:

  • 64GB slim SATA SSD

Replacing the SSDs:

  1. To replace an SSD in the slot labeled Disk2:

    1. Make sure that there is no VMHost %d Boot from alternate disk alarm in the output:

      user@host>show chassis alarm

    To replace an SSD in the slot labeled Disk1:

    1. Make sure that the router is booted up and running from an image from disk1.

      Back up the currently running vmhost and Junos OS on disk1 to ensure that both disk1 and disk2 have the same version of vmhost and Junos OS:

      user@host> request vmhost snapshot [partition]

      Note

      Partitioning the target media is optional.

    2. Reboot the router from disk2:

      user@host> request vmhost reboot disk2

    3. Check for the presence of the VMHost %d Boot from alternate disk alarm in the output:

      user@host>show chassis alarm

  2. Offline the Routing Engine by pressing the ONLINE/OFFLINE button.
  3. Remove the SSD.

    1. Attach an ESD grounding strap to your bare wrist, and connect the strap to an ESD point on the appliance.

      For more information about ESD, see Preventing Electrostatic Discharge Damage in the hardware guide for your router.

    2. Unfasten the thumbscrew that secures the access door in front of the storage drive slots, and open the door.
    3. Slide the lock on the ejector to the unlocked position.
    4. Carefully slide the drive out of the slot.
    Figure 5: Removing an SSD in the Routing Engine RE-S-X6-64G
    Removing an SSD in the Routing Engine RE-S-X6-64G
  4. Reinstall an SSD:

    1. Carefully align the sides of the drive with the guides in the slot.
    2. Slide the drive into the slot until you feel resistance, carefully ensuring that it is correctly aligned.
    3. Close the access door and tighten the thumbscrew to secure the door.

  1. Copy Junos OS to the newly replaced SSD:

    If both the SSDs are replaced together:

    1. Install using an USB disk:

      1. Insert the USB disk in the USB slot on the Routing Engine.

      2. After the Routing Engine boots from the USB, press y when you are prompted to confirm Install vmhost and Junos software on Primary and Secondary disk [y/N? on the console.

      3. After the installation is completed, press y when prompted to confirm Reboot now? [y/N]? to reboot from the SSD disk.

      Note

      To prepare a bootable USB disk, see Creating an Emergency Boot Device for Routing Engines with VM Host Support.

    2. Install vmhost using the PXEBoot method:

      1. Set up the PXEBoot server. See Copying VM Host Installation Package to the PXE Boot Server.

      2. Bring the Routing Engine online by pressing the ONLINE/OFFLINE button

      3. During the boot, when you see the message Press Esc for boot options press Esc key to enter into the BIOS menu boot options.

        After the Esc key is pressed, Esc is pressed. Go to boot options. is displayed on the screen.

      4. Using Up or Down arrow keys, navigate to Boot Manager and press the Enter key.

      5. Using Up or Down arrow keys, navigate through the EFI boot devices listed and select EFI Network 0 for IPv4 to boot from the PXEboot server and press the Enter key.

      6. Booting `net boot console is displayed and PXEBoot continues.

        Note

        The booting process may take several minutes.

      7. After the Routing Engine boots, press y when you are prompted to confirm Install vmhost and Junos software on Primary and Secondary disk [y/N? on the console.

      8. After the installation is completed, press y when prompted to confirm Reboot now? [y/N]? to reboot from the SSD disk.

    If only disk2 is replaced:

    1. Bring the Routing Engine online by pressing the ONLINE/OFFLINE button.

    2. The router boots from disk1. To be able to boot from disk2:

      user@host> request vmhost snapshot partition

    If only disk1 is replaced:

    1. Bring the Routing Engine online by pressing the ONLINE/OFFLINE button.

    2. The router boots from disk2 . To be able to boot from disk1:

      user@host> request vmhost snapshot partition

Figure 6: Installing an SSD in the Routing Engine RE-S-X6-64G
Installing an SSD in the Routing Engine RE-S-X6-64G
  1
Carrier
  2
SSD card

Copying vmhost and Junos OS from an USB disk when both the SSDs are replaced together:

Note

To prepare a bootable USB disk, see Creating an Emergency Boot Device for RE-MX-X6, RE-MX-X8 and RE-PTX-X8 Routing Engines.

  1. Insert the USB disk in the USB slot on the Routing Engine.
  2. After the Routing Engine boots from the USB, press y when you are prompted to confirm Install vmhost and Junos software on Primary and Secondary disk [y/N]? on the console.
  3. After the installation is completed, press y when prompted to confirm Reboot now? [y/N]? to reboot from the SSD disk.

Copying vmhost and Junos OS to the SSDs from the PXEBoot server:

  1. Set up the PXEBoot server. See Copying VM Host Installation Package to the PXE Boot Server.
  2. Bring the Routing Engine online by pressing the ONLINE/OFFLINE button.
  3. During the boot, when you see the message Press Esc for boot options press Esc key to enter into the BIOS menu boot options.

    After the Esc key is pressed, Esc is pressed. Go to boot options. is displayed on the screen.

  4. Using Up or Down arrow keys, navigate to Boot Manager and press the Enter key.
  5. Using Up or Down arrow keys, navigate through the EFI boot devices listed and select EFI Network 0 for IPv4 to boot from the PXEboot server and press the Enter key.
  6. Booting `net boot console is displayed and PXEBoot continues.Note

    The booting process may take several minutes.

  7. After the Routing Engine boots, press y when you are prompted to confirm Install vmhost and Junos software on Primary and Secondary disk [y/N]? on the console.

  8. After the installation is completed, press y when prompted to confirm Reboot now? [y/N]? to reboot from the SSD disk.

Copying vmhost and Junos OS when only one disk is replaced:

  1. Bring the Routing Engine online by pressing the ONLINE/OFFLINE button.

  2. The router boots from disk1 if disk2 is replaced. To be able to boot from disk2:

    user@host> request vmhost snapshot partition

    The router boots from disk2 if disk1 is replaced. To be able to boot from disk1:

    user@host> request vmhost snapshot recovery partition

Replacing Connections to MX480 Routing Engine Interface Ports

Replacing the Management Ethernet Cable on an MX Series Router

One Ethernet cable with RJ-45 connectors is provided with the router. To replace the cable connected to the ETHERNET port:

  1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  2. Press the tab on the connector, and pull the connector straight out of the port. Figure 7 shows the connector.
  3. Disconnect the cable from the network device.
  4. Plug one end of the replacement cable into the ETHERNET port. Figure 8 shows the port.
  5. Plug the other end of the cable into the network device.
Figure 7: Cable Connector
 Cable Connector
Figure 8: Ethernet Port
Ethernet Port

Replacing the Console or Auxiliary Cable on an MX480 Router

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 router. If you want to connect a device to both ports, you must supply another cable.

To replace a cable connected to a management console or auxiliary device:

  1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  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 the RJ-45 end of the replacement serial cable into the CONSOLE or AUX port. Figure 9 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.
Figure 9: Auxiliary and Console Ports
Auxiliary and Console
Ports

Upgrading to the RE-S-X6-64G Routing Engine in a Redundant Host Subsystem

A redundant host subsystem consists of a master Routing Engine (RE0) and a backup Routing Engine (RE1). To upgrade the host subsystem to use the RE-S-X6-64G Routing Engine, you must first uninstall the backup Routing Engine and install the RE-S-X6-64G Routing Engine, which then becomes the backup Routing Engine. You then switch over this backup Routing Engine to make it the master Routing Engine. Replace the other Routing Engine and configure it as the backup Routing Engine.

Ensure that the Switch Control Board in the chassis is SCBE2 because the RE-S-X6-64G Routing Engine is not compatible with the Switch Control Boards SCB or SCBE. To upgrade the Switch Control Board to SCBE2, see Upgrading an MX240 to Use the SCBE2-MX, Upgrading an MX480 to Use the SCBE2-MXor Upgrading an MX960 to Use the SCBE2-MX, depending on the chassis on which the Routing Engine is being upgraded.

Note

Save the router configuration before proceeding with the Routing Engine upgrade.

Note

Nonstop active routing (NSR) and graceful Routing Engine switchover (GRES) are not supported during the upgrade and they must be temporarily disabled. Disable NSR by removing the nonstop-routing statement from the [edit routing-options] hierarchy level and by removing the graceful-switchover statement from the [edit chassis redundancy] hierarchy level .

  1. Removing the Routing Engine

  2. Installing the Routing Engine RE-S-X6-64G

  3. Verifying and Configuring the Upgraded Routing Engine as the Master

  4. Verifying and Configuring the Upgraded Routing Engine as the Backup

Removing the Routing Engine

To remove the backup Routing Engine from the chassis (see Figure 10, Figure 11, and Figure 12):

  1. On the external management device connected to the Routing Engine, shut down the host subsystem by using the request system power-off command.
  2. Wait until a message appears on the console confirming that the operating system has halted.
  3. Remove the cables connected to the Routing Engine.
  4. Place an electrostatic bag or antistatic mat on a flat, stable surface. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  5. Verify that the Routing Engine LEDs are off. Loosen the captive screws on the top and bottom of 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. 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 10: Removing a Routing Engine from an MX240 Router
Removing a Routing Engine from
an MX240 Router
Figure 11: Removing a Routing Engine from an MX480 Router
Removing a Routing Engine from an
MX480 Router
Figure 12: Removing a Routing Engine from an MX960 Router
Removing a Routing Engine from an
MX960 Router

Installing the Routing Engine RE-S-X6-64G

To install the Routing Engine RE-S-X6-64G:

  1. Attach an 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, flip the ejector handles outward.
  3. Place one hand underneath the Routing Engine to support it and carefully align the sides of the Routing Engine with the guides inside the opening on the Switch Control Board SCBE2.Note

    The Routing Engine RE-S-X6-64G is supported only on the SCBE2. RE-S-X6-64G is not compatible with the SCB or the SCBE.

  4. Slide the Routing Engine into the SCBE2 until you feel resistance, and then press the Routing Engine's faceplate until it engages the connectors.
  5. Press both of the ejector handles inward to seat the Routing Engine. Tighten the captive screws on the top and bottom of the Routing Engine.
  6. Connect the management device cables to the Routing Engine. After the Routing Engine is installed, the ONLINE LED starts blinking green slowly.
  7. Replace the former master Routing Engine, RE0, with the Routing Engine RE-S-X6-64G. Note

    The Routing Engine RE-S-X6-64G is supported only on the SCBE2. RE-S-X6-64G is not compatible with the SCB or the SCBE.

The Routing Engine might require several minutes to boot. After the Routing Engine boots, verify that it is installed correctly by checking the FAIL, RE0, and RE1 LEDs on the craft interface. If the router is operational and the Routing Engine is functioning properly, the green ONLINE LED on the Routing Engine lights steadily. If the red FAIL LED on the Routing Engine lights steadily instead, remove and install the Routing Engine again. If the red FAIL LED still lights steadily, the Routing Engine is not functioning properly. Contact your customer support representative.

Figure 13: Installing a Routing Engine in an MX240 Router
Installing a Routing Engine in an MX240 Router
Figure 14: Installing a Routing Engine in an MX480 Router
Installing a Routing Engine in an MX480 Router
Figure 15: Installing a Routing Engine in an MX960 Router
Installing a Routing Engine in an MX960 Router

Verifying and Configuring the Upgraded Routing Engine as the Master

After replacing the backup Routing Engine with the RE-S-X6-64G Routing Engine, perform the following steps:

  1. Verify that the SCBE2 and RE-S-X6-64G Routing Engine are online by issuing the show chassis hardware command.
  2. After you install the RE-S-X6-64G Routing Engine into the SCBE2, the Routing Engine gets automatically powered on and comes up in amnesiac mode as it is loaded with factory defaults. After the Routing Engine comes up in amnesiac mode, load the base configuration and commit.
  3. Configure the backup Routing Engine by using the commit synchronize command to copy the configuration to the backup Routing Engine.
  4. Use the request chassis routing-engine master switch command to make the Routing Engine RE-S-X6-64G (RE1) the master Routing Engine. All FPCs reboot after this step.

Verifying and Configuring the Upgraded Routing Engine as the Backup

  1. Use the request chassis routing-engine master switch command to make newly installed RE-S-X6-64G (RE0) the backup Routing Engine.
  2. Use the commit synchronize command to copy the active configuration from the master Routing Engine to the backup Routing Engine.

Upgrading to the RE-S-X6-64G Routing Engine in a Nonredundant Host Subsystem

In a nonredundant host subsystem, only one Routing Engine and one Switch Control Board are present in the chassis. When you are upgrading the Routing Engine, taking the host subsystem offline shuts down the router. To upgrade the host subsystem with the RE-S-X6-64G Routing Engine, you must uninstall the existing Routing Engine and install the RE-S-X6-64G Routing Engine. Ensure that the Switch Control Board in the chassis is SCBE2 because the RE-S-X6-64G Routing Engine is not compatible with the Switch Control Boards SCB or SCBE. To upgrade the Switch Control Board to SCBE2, see Upgrading an MX240 to Use the SCBE2-MX, Upgrading an MX480 to Use the SCBE2-MXor Upgrading an MX960 to Use the SCBE2-MX, depending on the chassis on which the Routing Engine is being upgraded. .

Note

Save the router configuration before proceeding with the Routing Engine upgrade.

  1. Removing the Routing Engine

  2. Installing the Routing Engine RE-S-X6-64G

Removing the Routing Engine

To remove the Routing Engine from the chassis:

  1. On the external management device connected to the Routing Engine, shut down the host subsystem by using the request system power-off command.
  2. Wait until a message appears on the console confirming that the operating system has halted.
  3. Remove the cables connected to the Routing Engine.
  4. Place an electrostatic bag or antistatic mat on a flat, stable surface. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  5. Verify that the Routing Engine LEDs are off. Loosen the captive screws on the top and bottom of 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. 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.

Installing the Routing Engine RE-S-X6-64G

To install the new Routing Engine (RE-S-X6-64G):

  1. Attach an 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, flip the ejector handles outward.
  3. Place one hand underneath the Routing Engine to support it and carefully align the sides of the Routing Engine with the guides inside the opening on the SCBE2.Note

    The Routing Engine RE-S-X6-64G is supported only on the SCBE2. RE-S-X6-64G is not compatible with the SCB or the SCBE.

  4. Slide the Routing Engine into the SCBE2 until you feel resistance, and then press the Routing Engine's faceplate until it engages the connectors.
  5. Press both of the ejector handles inward to seat the Routing Engine. Tighten the captive screws on the top and bottom of the Routing Engine.
  6. Connect the management device cables to the Routing Engine. After the Routing Engine is installed, the ONLINE LED starts blinking green slowly.
  7. Verify that the SCBE2 and RE-S-X6-64G Routing Engine are online by issuing the show chassis hardware command.
  8. After you install the RE-S-X6-64G Routing Engine into the SCBE2, the Routing Engine gets automatically powered on and comes up in amnesiac mode as it is loaded with factory defaults. After the Routing Engine comes up in amnesiac mode, load the base configuration and commit.

The Routing Engine might require several minutes to boot. After the Routing Engine boots, verify that it is installed correctly by checking the FAIL, RE0, and RE1 LEDs on the craft interface. If the router is operational and the Routing Engine is functioning properly, the green ONLINE LED on the Routing Engine lights steadily. If the red FAIL LED lights steadily instead, remove the Routing Engine and reinstall it. If the red FAIL LED on the Routing Engine still lights steadily, the Routing Engine is not functioning properly. Contact your customer support representative.