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MX10004 Switch Fabric Board Maintenance

Each Juniper Networks MX10004 router contains a minimum of three and a maximum of six JNP10004-SF2 Switch Fabric Boards (SFBs). These boards are installed vertically, mid-chassis, between the line cards and the Routing and Control Boards (RCBs) in the front and the fan trays in the rear. The topics in this section describe how to install or remove the switch fabric boards in a router.

How to Handle and Store MX10004 Switch Fabric Board

The MX10004 SFBs have fragile components. To prevent damage to the SFBs, be sure you follow safe handling practices.

How to Hold an SFB

You install Juniper Networks Switch Fabric Boards (SFBs) vertically and hold them vertically until they are clear of the router. Then, you rotate them 90 degrees and place them on an antistatic mat or in an antistatic bag for storage. See Figure 1.

Figure 1: JNP10004-SF2 Switch Fabric Board JNP10004-SF2 Switch Fabric Board

The proper method of holding an SFB is to:

  1. Hold the SFB by the ejectors while keeping the SFB vertical, and slide the SFB about three-quarters of the way out of the chassis.
  2. Place one hand underneath the SFB to support it and slide it completely out of the chassis.
    CAUTION:

    Hold the SFB by the ejectors. Never hold the SFB by the connector edge. The connectors are fragile and the SFB won’t align and seat properly if the connector is damaged.
    CAUTION:

    Keep SFBs separate. Don’t stack SFBs on top of one another or on top of any other component.

How to Store a Switch Fabric Board

You must store Juniper Networks Switch Fabric Boards (SFBs) either in the chassis or in a spare shipping container, horizontally, and sheet-metal side down. Do not stack these units on top of one another or on top of any other component. Place each unit separately in an antistatic bag or on an antistatic mat placed on a flat, stable surface.

Note:

We recommend that two people insert the SFB into the bag because these units are heavy and antistatic bags are fragile.
Note:

The JNP10004-SF2 SFBs are shipped with protective plastic covers on the fabric interface connectors. The plastic covers keep the connectors clean and free of dust and other particles. When you remove JNP10004-SF2 SFB from the router, re-insert the protective plastic covers on the fabric interface connectors and then place the SFB in an antistatic bag or on an antistatic mat placed on a flat, stable surface.

To store an SFB in an antistatic bag if two people are available to lift the unit:

  1. Hold the unit horizontally with the faceplate toward you.
  2. Slide the opening of the bag over the connector edge.

To store an SFB in an antistatic bag if you must insert the SFB into a bag by yourself:

  1. Lay the unit horizontally on an antistatic mat that is on a flat, stable surface with the sheet-metal side down.

  2. Orient the unit with the faceplate toward you.

  3. Carefully insert the connector edge into the opening of the bag and pull the bag toward you to cover the unit.

Install an MX10004 Switch Fabric Board

A Juniper Networks MX10004 router has up to six SFBs that are located in the middle of the chassis behind the fan trays. SIB 0 through SIB 2 are located behind the left fan tray, and SIB 3 through SIB 5 are located behind the right fan tray. You must remove the appropriate fan tray to install an SFB. See Remove an MX10004 Fan Tray.

Note:

When replacing the fans or SFBs at 40° C chassis ambient temperature, ensure that the fans run at 100% fan speed for at least 10 minutes before replacing the fans or SFBs.

Use the test chassis fan tray 0 speed full-speed and test chassis fan tray 1 speed full-speed commands to set the chassis fans to 100% speed.

After replacing the fans or SFBs, set the fans to normal speed using the test chassis fan tray 0 speed normal and test chassis fan tray 1 speed normal command.

If you plan to replace one or more Switch Fabric Boards (SFBs), make sure you calculate the time required to remove the fan tray, add or replace the SFBs, and install the fan tray in the chassis. To calculate the time allowed for replacing a SFB, see Table 1.

Table 1: Switch Fabric Board Removal Alarm Times

Line Card Type

Ambient Temperature (°C)

Traffic (%)

Duration

MX10K-LC9600

25

100%

2 min 23 sec

35

100%

1 min 26 sec

40

100%

1 min 36 sec

MX10K-LC2101

33

100%

3 min 28 sec

40

100%

2 min 4 sec

MX10K-LC480

40

100%

6 min

Ensure that you have the following equipment before you install an SFB:

  • Antistatic bag or antistatic mat

  • Electrostatic discharge (ESD) grounding strap

  • Phillips (+) number 2 screwdriver (optional)

  • Replacement SFB

To install an MX10004 Switch Fabric Board:

  1. Place an antistatic bag or an antistatic mat on a flat, stable surface.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist and connect the other end of the strap to an ESD point on the chassis. An ESD point is located next to the protective earthing terminal and below the bottom power supply on the rear of the MX10004 (see Figure 2).
    Figure 2: ESD Point on the Rear of the MX10004 ESD Point on the Rear of the MX10004
      1
    —

    ESD point

    		 
  3. Remove the appropriate fan tray (see Remove an MX10004 Fan Tray).
    CAUTION:

    Do not remove both fan trays at the same time. Remove and replace one fan tray at a time. If you remove both fan trays, the system triggers a thermal alarm and shuts down the router.
  4. Either remove the failing SFB (see Remove an MX10004 Switch Fabric Board) or remove the cover by grasping each side of the plate and pulling straight out (see Figure 3).
    Figure 3: Remove an SFB Cover on an MX10004 Remove an SFB Cover on an MX10004
  5. Remove the protective plastic covers that are on the fabric interface connectors of the SFB. Save the plastic covers for future use (see Figure 4).
    Figure 4: Remove Protective Plastic Covers from JNP10004-SF2 SFB Interface Connectors Remove Protective Plastic Covers from JNP10004-SF2 SFB Interface Connectors
  6. Lift the SFB by the handle with one hand and support the lower edge with the other hand.
  7. Hold the SFB vertically and slide the SFB into the open slot until the ejector handles engage and start to close.
  8. Grasp the two ejector handles and fold them inward until they latch to seat the SFB (see Figure 5).
    Figure 5: Install an MX10004 Switch Fabric Board Install an MX10004 Switch Fabric Board
  9. Tighten the captive screws at the top and bottom of the SFB by hand or with a Phillips screwdriver (see Figure 6).
    Figure 6: Tighten the Captive Screws on the SFB Tighten the Captive Screws on the SFB
  10. Install the appropriate fan tray (see Install an MX10004 Fan Tray).
  11. Set the fans to normal speed using the test chassis fan tray speed 0 normal and test chassis fan tray speed 1 normal command.
  12. Bring the SFB online using the request chassis sfb slot slot-number online command.

    You can check the status of the SFB using the show chassis sfb and the show chassis fabric summary commands.

    Note:

    If you completely powered off the SFB using the set chassis sfb slot-number offline command, you must delete the configuration to bring the SFB online. To delete the configuration and bring a replacement SFB online, use the delete chassis sfb slot-number offline command.
    Note:

    Hyper-mode is the default forwarding mode on the JNP10004-SF2 SFB.

Remove an MX10004 Switch Fabric Board

A Juniper Networks MX10004 router has up to six Switch Fabric Boards (SFBs) that are located in the middle of the chassis behind the fan trays. SIB 0 through SIB 2 are located behind the left fan tray and SIB 3 through SIB 5 are located behind the right fan tray. You must remove the appropriate fan tray to access the failing SFB. See Remove an MX10004 Fan Tray.

If you plan to replace one or more Switch Fabric Boards (SFBs), make sure you calculate the time required to remove the fan tray, add or replace the SFBs, and install the fan tray in the chassis. To calculate the time allowed for replacing a SFB, see Table 1.

Ensure that you have the following equipment on hand before replacing a SFB:

  • Electrostatic bag or antistatic mat

  • Electrostatic discharge (ESD) grounding strap

  • Phillips (+) number 2 screwdriver (optional)

  • Replacement SFB or SFB cover (JNP10K-SF-BLNK) for the empty slot

CAUTION:

Do not remove the SFB unless you have a replacement SFB or a SFB cover (JNP10004-SF-BLNK) available.
Note:

If you are not installing another SFB into the empty card slot within a short time, install the SFB cover into the slot to maintain proper airflow in the card cage.
Note:

When replacing the fans or SFBs at 40° C chassis ambient temperature, ensure that the fans run at 100% fan speed for at least 10 minutes before replacing the fans or SFBs. Use the test chassis fan tray 0 speed full-speed and test chassis fan tray 1 speed full-speed commands to set the chassis fans to 100% speed.

After replacing the fans or SFBs, set the fans to normal speed using the test chassis fan tray 0 speed normal and test chassis fan tray 1 speed normal command.

To remove an MX10004 Switch Fabric Board:

  1. Take the SFB offline using the request chassis sfb slot slot-number offline command.
    Note:

    If you suspect the SFB is faulty and want to ensure that packets do not flow through the SFB, power off the SFB instead of taking the SFB offline. To power down the SFB, use the set chassis sfb slot-number offline command. Before you bring a new SFB in that slot online, you must delete the old configuration using the delete chassis sfb slot slot-number offline command.
  2. Place an electrostatic bag or an antistatic mat on a flat, stable surface.
  3. Wrap and fasten one end of the ESD grounding strap around your bare wrist and connect the other end of the strap to an ESD point on the chassis. An ESD point is located next to the protective earthing terminal and below the bottom power supply on the rear of the MX10004 (see Figure 7).
    Figure 7: ESD Point on the Rear of the MX10004 ESD Point on the Rear of the MX10004
      1
    —

    ESD point

    		 
  4. Remove the appropriate fan tray (see Remove an MX10004 Fan Tray).
    CAUTION:

    Do not remove both fan trays at the same time. Remove and replace one fan tray at a time. If you remove both fan trays, the system triggers a thermal alarm and shuts down the chassis.
  5. Loosen the captive screws at the top and bottom of the SFB by hand or with a Phillips screwdriver. See Figure 8.
    Figure 8: Loosen the Captive Screws on the SFB Loosen the Captive Screws on the SFB
  6. Grasp both handles and spread them apart. The SFB slides about a quarter of the way out of the slot. See Figure 9.
    Figure 9: Join the Ejector Handles Join the Ejector Handles
  7. Grasp the ejector handles with one hand and place your other hand under the SFB for support as you slide the SFB out of the slot.
    CAUTION:

    The SFB surface and handles may be hot. Allow a few minutes for the surface and handles to cool by pulling the SFB halfway out of the chassis. Wear proper protective, heat-resistant gloves while removing an SFB.
  8. Support the SFB as you rotate the SFB 90 degrees and place it on the antistatic mat with the printed circuit board (PCB) facing upward. Be careful to handle the SFB by the ejectors. Be careful not to bump or handle the SFB by the connectors. If you don’t have an antistatic mat, have another person help you slide the antistatic bag over the SFB before you place it on a stable surface.
    CAUTION:

    Do not stack hardware components on top of one another after you remove them. Place each component on an antistatic mat resting on a stable, flat surface.
  9. Re-insert the protective plastic covers on the fabric interface connectors of the SFB to keep the connectors clean and free of dust and other particles (see Figure 10).
    Figure 10: Insert the Protective Plastic Covers on the JNP10004-SF2 SFB Interface Connectors Insert the Protective Plastic Covers on the JNP10004-SF2 SFB Interface Connectors