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Taking the M320 Host Subsystem Offline

The host subsystem is taken offline and brought online as a unit. Before you replace a CB or a Routing Engine, you must take the host subsystem offline.

Normally, if two host subsystems are installed in the router, RE0 functions as the master and RE1 functions as the backup. You can remove the backup host subsystem (or either of its components) without interrupting the functioning of the router. If you take the master host subsystem offline, the backup host subsystem becomes the master (the router might reboot, depending on your configuration). If the router has only one host subsystem, taking the host subsystem offline causes the router to shut down.

Table 1 explains the effect of taking the host subsystem offline.

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 each Routing Engine.

Note: For information about configuring graceful Routing Engine switchover, graceful restart, and nonstop active routing, see the Junos High Availability Configuration Guide.

Note: The first supported release for graceful Routing Engine switchover and nonstop active routing on the M320 router is Junos OS Release 6.2 and Junos OS Release 8.4, respectively. However, for graceful Routing Engine switchover we recommend Junos OS Release 7.0 or later. Graceful restart software requirements are dependent on the routing protocols configured on the router. For the minimum software requirements for graceful restart, see the Junos High Availability Configuration Guide.

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.
   • 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
     ...
     

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

   Note: Router performance might change if the standby 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.

3. On the console or other management device connected to the Routing Engine that is paired with the CB 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 SIB might continue forwarding traffic for approximately five minutes after the request system halt command has been issued.

Replacing an M320 CB

• Removing an M320 CB
• Installing an M320 CB

Removing an M320 CB

The routercan have one or two CBs. They are located in the upper rear of the chassis in the slots marked CB0 and CB1. Each weighs approximately 3.4 lb (1.5 kg).

Caution: Before you replace a CB, you must take the host subsystem offline. If there is only one host subsystem, taking the host subsystem offline shuts down the router. See Taking the M320 Host Subsystem Offline.

Caution: If the CB to be replaced is associated with the Routing Engine currently functioning as the master Routing engine, switch it to the backup before removing the CB. See Taking the M320 Host Subsystem Offline.

To remove a CB, follow this procedure (see Figure 1):

1. Take the host subsystem offline. See Taking the M320 Host Subsystem Offline.
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 to an M Series, MX Series, or T Series Router.
4. If applicable, disconnect the cables plugged into the ports labeled EXTERNAL CLOCK INPUTS.
5. Loosen the captive screws (using a Phillips (+) screwdriver, number 2) on the ejector handles on both sides of the CB faceplate.
6. Flip the ejector handles outward to unseat the CB.
7. Grasp the ejector handles and slide the CB about halfway out of the chassis.
8. Place one hand underneath the CB to support it and slide it completely out of the chassis.
9. Place the CB on the antistatic mat.
10. If you are not replacing the CB now, install a blank panel over the empty slot.

Installing an M320 CB

To install a CB (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. Carefully align the sides of the CB with the guides inside the chassis.
3. Slide the CB into the chassis, carefully ensuring that it is correctly aligned.
4. Grasp both ejector handles, and press them inward to seat the CB.
5. Tighten the captive screws on the ejector handles, using a Phillips (+) screwdriver, number 2.
6. If applicable, reconnect the cable previously plugged into the CIP port.
7. If power is applied to the Routing Engine and its corresponding CB is functioning normally, the CB comes online automatically. To verify that the CB is functioning normally, check the LEDs on its faceplate. The green OK LED should light steadily a few minutes after the CB is installed. If the FAIL LED is lit steadily, remove and install the CB again. If the FAIL LED still lights steadily, the CB is not functioning properly. Contact your customer support representative.

   To check the status of the CB, use the CLI command:

   
   

   user@host> show chassis environment cb

Replacing an M320 PC Card

• Removing an M320 PC Card
• Installing an M320 PC Card

Removing an M320 PC Card

The slots labeled PC CARD on the Routing Engine faceplate accept a Type I PC Card, as defined in the PC Card Standard published by the Personal Computer Memory Card International Association (PCMCIA). The router is shipped with a PC Card that contains Junos OS. The PC Card can be used to copy Junos OS from the PC Card onto the Routing Engine. You can also copy Junos OS from the Routing Engine onto a PC Card, for example, to create a backup copy of upgrade software that you have obtained from Juniper Networks. Instructions for copying software to a PC Card are available at the Juniper Networks Support Web site (http://www.juniper.net/support/). After logging in, navigate to the Customer Support Center, then to the download page for Junos OS.

Note: The software on a PC Card is loaded only onto the Routing Engine into which the PC Card is inserted. It is not automatically copied to the other Routing Engine.

The PC card is inserted into one of the two slots—0 or 1—labeled PC CARD on the Routing Engine. To remove the PC card (see Figure 3):

1. Have ready an antistatic mat, placed 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. For more information about ESD, see Preventing Electrostatic Discharge Damage to an M Series, MX Series, or T Series Router.
3. On the Routing Engine faceplate, press the eject button on the right side of the PC card slot once to release the button. Press again to release the PC card.
4. The PC card pops partially out of the slot. Grasp the card and pull it completely out of the slot.
5. Place the PC card on the antistatic mat.

Installing an M320 PC Card

To install a PC card (see Figure 4):

1. Insert the PC card into either PC card slot on the Routing Engine, with the Juniper Networks logo facing downward.

   Caution: Be sure to insert the PC card with the label facing downward. Inserting the PC card incorrectly might damage the Routing Engine.

   Caution: Do not install more than one PC card in the Routing Engine.

2. Press the card firmly all the way into the slot.
3. To verify the PC card is installed correctly, check that the corresponding slot LED (labeled 0 or 1 SLOT) is lit.

Replacing a DIMM Module in M320 Routing Engines

1. Removing a M320 DIMM Module
2. Installing a M320 DIMM Module

Removing a M320 DIMM Module

The DIMM modules are located on the top of the Routing Engine. To remove a DIMM module:

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. Remove the Routing Engine.
4. Depending on which Routing Engine you are using, there are two different procedures for ejecting the DIMMs:
   • For Routing Engines with an ejector on one side of the DIMM, press the plastic ejector of the DIMM module. The edge of the module raises upward.
   • For Routing Engines with ejectors on each side of the DIMM, press the plastic ejectors on both sides of the DIMM module.
5. Grasp the DIMM module, being careful not to touch any electrical components on the module, and firmly pull it out of the slot on the Routing Engine.
6. Place the DIMM module on the antistatic mat or in the electrostatic bag.
7. Push the plastic ejectors to close the empty DIMM module slot.

Installing a M320 DIMM Module

To insert a DIMM module into the Routing Engine:

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. Remove the DIMM module from its electrostatic bag.
3. To open the empty DIMM slot, press the plastic ejectors open.
4. Grasp the DIMM module by the edges, being careful not to touch any electrical components.
5. Pressing firmly on both ends, push the module into the slot until the ejectors return completely to the closed position.
6. Install the Routing Engine.
7. You can view the the SDRAM configuration and verify the DIMM was installed correctly by issuing the show chassis routing-engine command.

Replacing an M320 Routing Engine

• Removing an M320 Routing Engine
• Installing an M320 Routing Engine

Removing an M320 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 weighs approximately 2.4 lb (1.1 kg).

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. See Taking the M320 Host Subsystem Offline.

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. See Taking the M320 Host Subsystem Offline.

To remove a Routing Engine from a CB, follow this procedure (see Figure 6):

1. Take the host subsystem offline as described in Taking the M320 Host Subsystem Offline.
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 to an M Series, MX Series, or T Series Router.
4. If applicable, loosen the screws on the extractor handles at either end of the Routing Engine faceplate, using a Phillips screwdriver.
5. Press the red tabs on the ejector handles on both sides of the Routing Engine faceplate.
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 of your hands underneath the Routing Engine to support it and slide it completely out of the chassis.
9. Place the Routing Engine on the antistatic mat.
10. If you are not replacing the Routing Engine now, install a blank panel over the empty slot.

Installing an M320 Routing Engine

To install a Routing Engine (see Figure 7):

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 to an M Series, MX Series, or T Series Router.
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, using a Phillips screwdriver. Be sure to tighten the screws enough to seat the Routing Engine properly.
8. After the Routing Engine boots, verify that it is installed correctly by checking the RE0 and RE1 LEDs on the craft interface. If the router is operational and the Routing Engine is functioning properly, the green OK LED lights steadily. If the red FAIL LED lights steadily instead, remove and install the Routing Engine again (see Removing an M320 Routing Engine and Installing an M320 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 OS manuals.