Technical Documentation

Supported Platforms
T1600 Routers

Replacing T1600 Host Subsystem Components

Taking the T1600 Host Subsystem Offline

Before you replace a control board or a Routing Engine, you must take the host subsystem offline. The host subsystem is taken offline and brought online as a unit. Normally, if two host subsystems are installed in the router, RE0 functions as the master and RE1 functions as the backup. Table 1 explains the effect of taking the host subsystem offline.

Table 1: Effect of Taking the Host Subsystem Offline

Type of Host Subsystem	Effect of taking the Host Subsystem Offline
Nonredundant host subsystem	The router shuts down.
Backup host subsystem	The functioning of the router is not interrupted. The backup host subsystem is hot-removable and hot-insertable.
Master host subsystem	The backup host subsystem becomes the master. The backup Routing Engine assumes Routing Engine functions. The master host subsystem is hot-pluggable. Removal or failure of the master Routing Engine affects forwarding and routing based on the high availability configuration: Dual Routing Engines without any high availability features enabled—Traffic is interrupted while the Packet Forwarding Engine is reinitialized. All kernel and forwarding processes are restarted. When the switchover to the new master Routing Engine is complete, routing convergence takes place and traffic is resumed. Graceful Routing Engine switchover (GRES) is enabled—Graceful Routing Engine switchover preserves interface and kernel information. Traffic is not interrupted. However, graceful Routing Engine switchover does not preserve the control plane. Neighboring routers detect that the router has restarted and react to the event in a manner prescribed by individual routing protocol specifications. To preserve routing without interruption during a switchover, graceful Routing Engine switchover must be combined with nonstop active routing. Nonstop active routing is enabled (graceful Routing Engine switchover must be configured for nonstop active routing to be enabled)—Nonstop active routing supports Routing Engine switchover without alerting peer nodes that a change has occurred. Nonstop active routing uses the same infrastructure as graceful Routing Engine switchover to preserve interface and kernel information. However, nonstop active routing also preserves routing information and protocol sessions by running the routing protocol process (rpd) on both Routing Engines. In addition, nonstop active routing preserves TCP connections maintained in the kernel. Nonstop active routing is supported on Junos OS Release 8.5 and later for standalone T1600 routers, Junos OS Release 10.0 and later for T1600 routers in a routing matrix. Graceful restart is configured—Graceful restart provides extensions to routing protocols so that neighboring helper routers restore routing information to a restarting router. These extensions signal neighboring routers about the graceful restart and prevent the neighbors from reacting to the router restart and from propagating the change in state to the network during the graceful restart period. Neighbors provide the routing information that enables the restarting router to stop and restart routing protocols without causing network reconvergence. Neighbors are required to support graceful restart. The routing protocol process (rpd) restarts. A graceful restart interval is required. For certain protocols, a significant change in the network can cause graceful restart to stop.

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 switchover and nonstop active routing, see the Junos High Availability Configuration Guide.

To take a host subsystem offline:

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
...
 
```
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
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. For more information about the command, see the Junos System Basics and Services Command Reference.
Note: The SIBs might continue forwarding traffic for approximately 5 minutes after the request system halt command has been issued.

Replacing a T1600 T-CB

Removing a T1600 T-CB

The backup T-CB is hot-removable and hot-insertable.

The router can have up to two T-CBs. They are located in the upper rear of the chassis in the slots marked CB0 and CB1. Each weighs approximately 5 lb (2.3 kg).

Caution: Before you replace a T-CB, 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 T-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 T-CB. See Taking the T1600 Host Subsystem Offline .

To remove a T-CB (see Figure 1):

Take the host subsystem offline. See Taking the T1600 Host Subsystem Offline .
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. For more information about ESD, see T1600 Preventing Electrostatic Discharge Damage.
Loosen the captive screws (using a Phillips (+) screwdriver, number 2) on the ejector handles on both sides of the T-CB faceplate.
Flip the ejector handles outward to unseat the T-CB.
Grasp the ejector handles and slide the T-CB about halfway out of the chassis.
Place one hand underneath the T-CB to support it and slide it completely out of the chassis.
Place the T-CB on the antistatic mat.
If you are not replacing the T-CB now, install a blank panel over the empty slot.

Figure 1: Removing a T-CB

Image g002187.gif

Installing a T1600 T-CB

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

user@host> show chassis environment cb

Figure 2: Installing a T-CB

Image g002188.gif

Replacing a T1600 LCC-CB

Removing a T1600 LCC-CB

The router can have up to two LCC-CBs. They are located in the upper rear of the chassis in the slots marked CB0 and CB1. Each LCC-CB weighs approximately 5 lb (2.3 kg).

Caution: Before you replace an LCC-CB, you must take the host subsystem offline. If there is only one host subsystem, taking the host subsystem offline shuts down the router.

The backup LCC-CB is hot-removable and hot-insertable.

Caution: If the LCC-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 LCC-CB.

To remove a LCC-CB (see Figure 3):

Take the host subsystem offline. See Taking the T1600 Host Subsystem Offline .
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.
Loosen the captive screws (using a Phillips (+) screwdriver, number 2) on the ejector handles on both sides of the LCC-CB faceplate.
Flip the ejector handles outward to unseat the LCC-CB.
Grasp the ejector handles and slide the LCC-CB about halfway out of the chassis.
Place one hand underneath the LCC-CB to support it and slide it completely out of the chassis.
Place the LCC-CB on the antistatic mat.
If you are not replacing the LCC-CB now, install a blank panel over the empty slot.

Figure 3: Removing an LCC-CB

Image g004614.gif

Installing a T1600 LCC-CB

To install an LCC-CB (see Figure 4):

Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
Carefully align the sides of the LCC-CB with the guides inside the chassis.
Slide the LCC-CB into the chassis, carefully ensuring that it is correctly aligned.
Grasp both ejector handles, and press them inward to seat the LCC-CB.
Tighten the captive screws on the ejector handles, using a Phillips (+) screwdriver, number 2.
If applicable, reconnect the cable previously plugged into the CIP port.
If power is applied to the Routing Engine and its corresponding LCC-CB is functioning normally, the LCC-CB comes online automatically. To verify that the LCC-CB is functioning normally, check the LEDs on its faceplate. The green OK LED should light steadily a few minutes after the LCC-CB is installed. If the FAIL LED is lit steadily, remove and install the LCC-CB again. If the FAIL LED still lights steadily, the LCC-CB is not functioning properly. Contact your customer support representative.
To check the status of the LCC-CB, use the CLI command:

user@host> show chassis environment cb

Figure 4: Installing an LCC-CB

Image g004615.gif

Replacing a DIMM Module in T1600 Routing Engines

Removing a T1600 DIMM Module

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

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.
Remove the Routing Engine.
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.
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.
Place the DIMM module on the antistatic mat or in the electrostatic bag.
Push the plastic ejectors to close the empty DIMM module slot.

Installing a T1600 DIMM Module

To insert a DIMM module into the Routing Engine:

Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
Remove the DIMM module from its electrostatic bag.
To open the empty DIMM slot, press the plastic ejectors open.
Grasp the DIMM module by the edges, being careful not to touch any electrical components.
Pressing firmly on both ends, push the module into the slot until the ejectors return completely to the closed position.
Install the Routing Engine.
You can view the the SDRAM configuration and verify the DIMM was installed correctly by issuing the show chassis routing-engine command.

Figure 5: Installing the DIMM Module

Image g003237.gif

Replacing a T1600 Routing Engine

Removing a T1600 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. See Taking the T1600 Host Subsystem Offline .

To remove a Routing Engine (Installing the T1600 Routing Engine and Figure 7):

Take the host subsystem offline as described in Taking the T1600 Host Subsystem Offline .
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. For more information about ESD, see T1600 Preventing Electrostatic Discharge Damage.
Loosen the captive screws on the corners of the Routing Engine cover.
Grasp the Routing Engine cover by its edges and pull it free from the chassis (see Figure 6).
If applicable, loosen the screws on the extractor handles at either end of the Routing Engine faceplate, using a Phillips screwdriver.
Press the red tabs on the ejector handles on both sides of the Routing Engine faceplate.
Flip the ejector handles outward to unseat the Routing Engine.
Grasp the Routing Engine by the ejector handles and slide it about halfway out of the chassis.
Place one of your hands underneath the Routing Engine to support it and slide it completely out of the chassis.
Place the Routing Engine on the antistatic mat.
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 (see Installing the T1600 Routing Engine ).

Figure 6: Removing the Routing Engine Cover

Image g001569.gif

Figure 7: Removing a Routing Engine

Image g001515.gif

Figure 8: Removing a C1800 Routing Engine

Image g004604.gif

Installing the T1600 Routing Engine

To install a Routing Engine (see Figure 9):

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 T1600 Preventing Electrostatic Discharge Damage.
Ensure that the ejector handles are not in the locked position. If necessary, press the red tabs and flip the ejector handles outward.
Place one hand underneath the Routing Engine to support it. With the other hand, grasp one of the ejector handles on the faceplate.
Carefully align the sides of the Routing Engine with the guides inside the chassis.
Slide the Routing Engine into the chassis until you feel resistance, then press the Routing Engine's faceplate until it engages the midplane connectors.
Press both the ejector handles inward to seat the Routing Engine.
The Routing Engine might require several minutes to boot.
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.
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 10).

Figure 9: Installing a Routing Engine

Image g001516.gif

Figure 10: Reinstalling the Routing Engine Cover

Image g001570.gif

Verifying the Installation of the T1600 Routing Engine

If the router is powered on and the Routing Engine's corresponding control board is functioning normally, the Routing Engine comes online automatically. To verify that the Routing Engine is functioning normally:

Check the HOST0 and HOST1 LEDs on the craft interface.
- The green OK LED should light steadily a few minutes after the Routing Engine is installed.
- If the red FAIL LED is lit steadily, remove and install the Routing Engine again (see Removing a T1600 Routing Engine and Installing the T1600 Routing Engine ). Make sure that the Routing Engine is seated properly. If the FAIL LED still lights steadily, the Routing Engine is not functioning properly. Contact your customer support representative.

Verify that the Routing Engine is functioning properly. Display the status of the Routing Engine by issuing the show chassis routing-engine command:

user@host> show chassis routing-engine

Routing Engine status:
  Slot 0:
    Current state                  Master
    Election priority              Master (default)
    Temperature                 32 degrees C / 89 degrees F
    CPU temperature             33 degrees C / 91 degrees F
    DRAM                      2048 MB
    Memory utilization           8 percent
    CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     2 percent
      Interrupt                  0 percent
      Idle                      98 percent
    Model                          RE-4.0
    Serial ID                      P13004101110
    Start time                     2007-04-30 08:38:22 PDT
    Uptime                         2 days, 2 hours, 22 minutes, 43 seconds
    Load averages:                 1 minute   5 minute  15 minute
                                       0.02       0.02       0.00

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

Replacing a T1600 PC Card

Removing a T1600 PC Card

The PC Card is inserted into the slot labeled PC CARD on the Routing Engine. To remove the PC Card (see Figure 11):

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. For more information about ESD, see T1600 Preventing Electrostatic Discharge Damage.
Remove the Routing Engine cover by loosening the captive screws on the corners of its faceplate.
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.
Note: The Routing Engine in your router might have two PC Card slots. In this case, use either slot. Do not install more than one PC Card in the Routing Engine.
The PC Card pops partially out of the slot. Grasp the card and pull it completely out of the slot.
Place the PC Card on the antistatic mat.
If you are not replacing the PC Card now, reinstall the Routing Engine cover and tighten the screws on the corners of the cover to secure it to the chassis.

Figure 11: Removing a PC Card

Image g001518.gif

Installing the T1600 PC Card

To install a PC Card (see Figure 12):

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 T1600 Preventing Electrostatic Discharge Damage.
If the Routing Engine cover is in place, remove the cover by loosening the captive screws on the corners of its faceplate.
Insert the PC Card into the 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.
Note: The Routing Engine 1600 has two PC Card slots. In this case, use either slot. Do not install more than one PC Card in the Routing Engine.
Press the card firmly all the way into the slot.
Reinstall the Routing Engine cover and tighten the screws on the corners of the cover to secure it to the chassis.

Figure 12: Installing a PC Card

Image g001519.gif