To avoid any equipment damage or bodily injury caused by improper use, read the following safety recommendations before installation. Note that the recommendations do not cover every possible hazardous condition.

· Before cleaning the switch, remove all power cords from the switch. Do not clean the switch with wet cloth or liquid.

· Do not place the switch near water or in a damp environment. Prevent water or moisture from entering the switch chassis.

· Do not place the switch on an unstable case or desk. The switch might be severely damaged in case of a fall.

· Ensure good ventilation of the equipment room and keep the air inlet and outlet vents of the switch free of obstruction.

· Connect the yellow-green protection grounding cable before powering on the switch.

· Make sure the power input voltage is as required by the power supply.

· To avoid electrical shocks, do not open the chassis while the switch is operating or when the switch is just powered off.

· During switch installation, wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

Examining the installation environment

To ensure correct operation of your switch, make sure the installation environment meets the requirements listed in Table1-1.

Table1-1 Checking list for the installation environment

Item	Requirements
Ventilation and heat dissipation	CAUTION: To ensure correct operation of your device, make sure the installation environment is adequately ventilated to prevent the switch from overheating. · Ensure a minimum clearance of 10 cm (3.94 in) around the chassis. · Do not install the device near a heat source, for example, a stove or heater. · Ensure air ventilation in the installation environment. · Do not block the ventilation holes in the device or power adapter.
Anti-moisture	CAUTION: Water or moisture might damage the circuits of the device. · Do not place the device near water or in a damp environment. · Install the switch in a clean, dry, and ventilated place where temperature is controlled in a stable range. · Make sure the installation environment is free from water leakage or condensation. If required, install a dehumidification device (such as an air conditioner with a dehumidification function or a dedicated dehumidifier). · Do not operate the device under or near the water source, such as the wash basin, laundry room, or areas with high humidity. · Do not touch the device with wet hands.
Temperature/humidity	For correct operation and long service life of your switch, maintain the temperature and humidity in the equipment room at acceptable ranges. · Lasting high relative humidity can cause poor insulation, electricity leakage, mechanical property change of materials, and metal corrosion. · Lasting low relative humidity can cause washer contraction and ESD and cause issues including loose mounting screws and circuit failure. · High temperature can accelerate the aging of insulation materials and significantly lower the reliability and lifespan of the switch. For the temperature and humidity requirements of the switch, see technical specifications in S5560X-EI Switch Series Hardware Information and Specifications.
Lightning protection	CAUTION: Ground the switch correctly and verify the grounding. For more information, see "Grounding the switch." · If you ground the switch by using a grounding strip, make sure the grounding resistance of the grounding strip in the equipment room is less than 1W. · If you ground the switch by using a grounding conductor buried in the earth ground, make sure the grounding resistance of the grounding conductor in the ground is less than 10W. · Route the signal cables along indoor walls, bury the cables in the earth ground, or thread the cables through steel tubes. Install a signal lightning arrester with a nominal discharge current for a corresponding network interface. · Keep the signal cables far from power cords and lightning rod down conductors. · As a best practice, route power cords indoors. If an AC power cord is routed from outdoors, connect the AC power cord first to a power lightning arrester before leading it to the AC power port on the switch. Make sure the power lightning arrester has a nominal discharge current and the total length of the power cord from the power lighting arrester to the power port on the switch is less than 5 m (16.40 ft). · Ground the switch, rack, independent power modules, and lightning arresters separately. · You must ground optical fibers with reinforcing metal stiffener from outdoors on an optical distribution frame (ODF) or fiber splice enclosure.
Cable routing	CAUTION: Do not run an Ethernet cable and power cord in parallel. · Route different types of cables separately. · Keep power cords a minimum of 5 cm (1.97 in) away from other cables.
ESD prevention	· Ground the switch correctly. · To avoid ESD damage to the device or components, always wear an ESD wrist strap when you install or remove the device or components. · Make sure the wrist strap has good skin contact and is reliably grounded.
Cleanliness	For more information, see "Cleanliness."
Corrosive gas prevention	The installation site must be free from corrosive gases such as acid gases and alkaline gases. For more information, see "Corrosive gas limit."
EMI	· If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE) to filter interference from the power grid. · Keep the device far away from radio transmitting stations, radar stations, and high-frequency devices. · Use electromagnetic shielding, for example, shielded interface cables, when necessary.

Cleanliness

Dust buildup on the chassis might cause electrostatic adsorption and dust corrosion, resulting in poor contact of metal connectors and contact points. This might shorten the device's lifetime and even cause device failure in the worst case. Table1-2 describes the switch requirement for cleanliness.

Table1-2 Switch requirement for cleanliness

Substance	Particle diameter	Concentration limit
Dust particles	≥ 0.5 µm	≤ 1.8 × 10⁷ particles/m³

To maintain cleanliness in the equipment room, follow these guidelines:

· Keep the equipment room away from pollution sources. Do not smoke, eat, or drink in the equipment room.

· Use double-layer glass in windows and seal doors and windows with dust-proof rubber strips. Use screen doors and window screens for doors and windows open to the outside and make sure the external windows are air tight.

· Use dustproof materials for floors, walls, and ceilings and use wallpaper or matt paint that does not produce powders.

· Clean the equipment room regularly and clean the air filters of the rack each month.

· Wear ESD clothing and shoe covers before entering the equipment room, keep the ESD clothing and shoe covers clean, and change them frequently.

Corrosive gas limit

Corrosive gases can accelerate corrosion and aging of metal components. Make sure the corrosive gases do not exceed the concentration limits as shown in Table1-3.

Table1-3 Corrosive gas concentration limits

Gas	Average concentration (mg/m3)	Maximum concentration (mg/m3)
SO2	0.3	1.0
H2S	0.1	0.5
Cl2	0.1	0.3
HCI	0.1	0.5
HF	0.01	0.03
NH3	1.0	3.0
O3	0.05	0.1
NOX	0.5	1.0

CAUTION:

As a best practice, control the corrosive gas concentrations in the equipment room at their average values. Make sure the corrosive gas concentrations do not exceed 30 minutes per day at their maximum values.

To control corrosive gases, use the following guidelines:

· As a best practice, do not build the equipment room in a place with a high concentration of corrosive gases.

· Make sure the equipment room is not connected to sewer, vertical shaft, or septic tank pipelines and keep it far away from these pipelines. The air inlet of the equipment room must be away from such pollution sources.

· Use environmentally friendly materials to decorate the equipment room. Avoid using organic materials that contains harmful gases, such as sulfur or chlorine-containing insulation cottons, rubber mats, sound-proof cottons, and avoid using plasterboards with high sulfur concentration.

· Place fuel (diesel or gasoline) engines separately. Do not place them in the same equipment room with the device. Make sure the exhausted air of the engines will not flow into the equipment room or towards the air inlet of the air conditioners.

· Place batteries separately. Do not place them in the same room with the device.

· Employ a professional company to monitor and control corrosive gases in the equipment room regularly.

Examining the installation site

Before you install the switch, verify that the installation site meets the installation requirements. The switch can operate correctly in an A1 or A2 installation site. Availability issues might occur if you install the switch in an A3, B1, B2, or C installation site.

Table1-4 Installation sites

Category	Definition	Example
A1: indoor controlled environment	· Indoor environments where temperature and humidity are controlled. · Completely enclosed or shielded indoor environments.	Central equipment rooms, IDC equipment rooms, mobile cabins with air conditioners, outdoor air conditioner cabinets, and heat exchanger cabinets.
A2: indoor partially controlled environment	· Indoor environments where temperature and humidity are partially controlled. · Incompletely enclosed or shielded places. · Places far from pollution sources.	Simple equipment rooms, ordinary houses, garages, corridors, and direct ventilation cabinets far from pollution sources, houses without direct exposure to sunlight or rain, railway station platforms, and stadiums.
A3: indoor uncontrolled environment	· Indoor environments where temperature and humidity are uncontrolled. · Incompletely enclosed or shielded places. · Places near pollution sources.	Simple equipment rooms, ordinary houses, garages, corridors, and direct ventilation cabinets near pollution sources, houses without direct exposure to sunlight or rain, railway station platforms, stadiums, uncleaned rooms after decoration, and rooms under decoration.
B1: outdoor general environment	· Unshielded places where the temperature and humidity are not controlled. · Places far from pollution sources.	Completely exposed outdoor places far from pollution sources.
B2: harsh environment	· Unshielded places where the temperature and humidity are not controlled. · Sea environments or outdoor land environments near pollution sources.	Islands, ships, and completely exposed outdoor places near pollution sources.
C: special environments	Special application environments	Buried, underwater, or undersea environments and manholes.

Table1-5 Pollution sources

Category	Radius range
Saline water areas such as oceans and saline lakes	≤ 3.7 km (2.30 miles)
Serious pollution sources such as metallurgic plants, coal mines, and heat and power plants	≤ 3 km (1.86 miles)
Medium pollution sources such as chemical factories, rubber plants, and electroplating factories	≤ 2 km (1.24 miles)
Light pollution sources, such as food factories, tanneries, and heating boilers	≤ 1 km (0.62 miles)

Checking power distribution or power supply environment

Table1-6 Requirements for power distribution or power supply environment

Item	Requirements
Preparation	The power module must be available before you install the switch.
Voltage	The voltage provided to the switch must be within the operating voltage range. For the operating voltage range, see S5560X-EI Switch Series Hardware Information and Specifications.
Power receptacle and cables	· If the external power supply system provides an AC power outlet, use a country-specific AC power cord. Make sure the PE wire of the AC power supply is grounded reliably. · If the external power supply system provides a DC distribution box, prepare DC power cords yourself. · Do not use the power cord provided with the switch on other devices.

Laser safety

WARNING!

The switch is a class 1 laser device. Disconnected optical fibers or transceiver modules might emit invisible laser light. Do not stare into beams or view directly with optical instruments when the switch is operating.

Installation tools

No installation tools are provided with the switch. Prepare the following tools yourself as required:

· ESD wrist strap

· Flat-blade screwdriver

· Phillips screwdriver

· Needle-nose pliers

· Diagonal pliers

· Marker

Installation accessories

Before installation, make sure you have all the required installation accessories. If an installation accessory is damaged or lost, purchase a new one by using the BOM code in Table1-7.

Table1-7 Installation accessories

Code	Description	Quantity	Applicable device models
2150A03X	Front mounting kit, including a pair of front mounting brackets and eight M4 screws	1 pair, provided	All models
2150A0BP	Rear mounting bracket kit, including a pair of rear mounting brackets and two shoulder screws	1 pair, provided	S6520X-26MC-UPWR-SI S6520X-26XC-UPWR-SI S6520X-54XC-UPWR-SI
N/A	M6 screw and cage nut	User supplied	All models
N/A	Rubber feet	Four, provided	All models
N/A	Grounding cable The grounding cable in this figure is for illustration only. Your grounding cable might be slightly different from this one.	1, provided	All models
N/A	Grounding screw	1, provided	All models
N/A	Power module filler panel	1, provided	S6520X-26MC-UPWR-SI S6520X-26XC-UPWR-SI S6520X-54XC-UPWR-SI
N/A	Power module filler panel	1, provided	S6520X-16ST-SI S6520X-24ST-SI S6520X-18C-SI S6520X-26C-SI S6520X-26MC-SI
-	Interface module filler panel The interface module filler panel in this figure is for illustration only. Your interface module filler panel might be slightly different from this one.	2, provided	All models(except for S6520X-10XT-SI and S6520X-16XT-SI switches)
N/A	AC power cord The appearance and parameters for AC power cords vary depending on countries and regions. The AC power cord in this table is a standard AC power cord in China.	1, provided with removable power supplies	All models
04042967	DB9-to-RJ45 console cable	1, optional	All models
0404A1EE	USB-to-RJ45 console cable	1, optional	All models
N/A	Micro USB console cable	1 (user supplied)	All models

2 Installing the switch

CAUTION:

Keep the tamper-proof seal on a mounting screw on the chassis cover intact, and if you want to open the chassis, contact H3C for permission. Otherwise, H3C shall not be liable for any consequence.

Figure2-1 Hardware installation flow

Installing the switch in a 19-inch rack

Installation method

Table2-2 Installation method

Switch model	Installation method	Description
S6520X-16ST-SI S6520X-24ST-SI S6520X-10XT-SI S6520X-16XT-SI S6520X-18C-SI S6520X-26C-SI S6520X-26MC-SI	Using front mounting brackets	Attach the front mounting brackets to the sides of the chassis, on a position near the port side or power supply side as needed.
S6520X-26MC-UPWR-SI S6520X-26XC-UPWR-SI S6520X-54XC-UPWR-SI	Using front and rear mounting brackets	· Attach the front mounting brackets to the sides of the chassis, on a position near the port side or power supply side as needed. · Install the rear mounting brackets based on the rack depth. ¡ If the rack depth is in the range of 429 to 595 mm (15.89 to 23.43 in), orient the brackets with the wide flange inside the rack. ¡ If the rack depth is in the range of 274 to 440 mm (10.79 to 17.32 in) and the distance from the rear rack posts to the inner surface of the cabinet door is larger than 153 mm (6.02 in), orient the brackets with the wide flange outside the rack. · If you are to install the PSR1110-56A power supplies for the switch, make sure the rack depth is greater than 600 mm (23.62 in).

Switch model

Installation method

Description

S6520X-16ST-SI

S6520X-24ST-SI

S6520X-10XT-SI

S6520X-16XT-SI

S6520X-18C-SI

S6520X-26C-SI

S6520X-26MC-SI

Using front mounting brackets

Attach the front mounting brackets to the sides of the chassis, on a position near the port side or power supply side as needed.

S6520X-26MC-UPWR-SI

S6520X-26XC-UPWR-SI

S6520X-54XC-UPWR-SI

Using front and rear mounting brackets

· Attach the front mounting brackets to the sides of the chassis, on a position near the port side or power supply side as needed.

· Install the rear mounting brackets based on the rack depth.

¡ If the rack depth is in the range of 429 to 595 mm (15.89 to 23.43 in), orient the brackets with the wide flange inside the rack.

¡ If the rack depth is in the range of 274 to 440 mm (10.79 to 17.32 in) and the distance from the rear rack posts to the inner surface of the cabinet door is larger than 153 mm (6.02 in), orient the brackets with the wide flange outside the rack.

· If you are to install the PSR1110-56A power supplies for the switch, make sure the rack depth is greater than 600 mm (23.62 in).

Figure2-2 Procedure for rack-mounting the switch by using the front mounting brackets

Figure2-3 Procedure for rack-mounting the switch by using the front and rear mounting brackets

NOTE:

If a rack shelf is available, you can put the switch on the rack shelf, slide the switch to an appropriate location, and attach the switch to the rack by using the mounting brackets.

Mounting brackets

Table2-3 Mounting brackets available for the switch

Switch model	Front mounting brackets (Figure2-4)	Rear mounting bracket and shoulder screw (Figure2-5)
S6520X-16ST-SI S6520X-24ST-SI S6520X-10XT-SI S6520X-16XT-SI S6520X-18C-SI S6520X-26C-SI S6520X-26MC-SI	Provided	N/A
S6520X-26MC-UPWR-SI S6520X-26XC-UPWR-SI S6520X-54XC-UPWR-SI	Provided	Provided

Switch model

Front mounting brackets (Figure2-4)

Rear mounting bracket and shoulder screw (Figure2-5)

S6520X-16ST-SI

S6520X-24ST-SI

S6520X-10XT-SI

S6520X-16XT-SI

S6520X-18C-SI

S6520X-26C-SI

S6520X-26MC-SI

Provided

N/A

S6520X-26MC-UPWR-SI

S6520X-26XC-UPWR-SI

S6520X-54XC-UPWR-SI

Provided

Figure2-4 Front mounting bracket

(1) Screw hole for attaching the bracket to the switch	(2) Screw hole for attaching the bracket to the rack
(3) M4 screw

Figure2-5 Rear mounting bracket and shoulder screw

(1) Screw hole for attaching the bracket to the rack	(2) Shoulder screw

Rack-mounting the switch by using front mounting brackets

The S6520X-16ST-SI, S6520X-24ST-SI, S6520X-10XT-SI, S6520X-16XT-SI, S6520X-18C-SI, S6520X-26C-SI, and S6520X-26MC-SI switches support rack mounting by using front mounting brackets. The following procedure rack-mounts an S6520X-26C-SI switch.

Attaching the front mounting brackets to the switch

1. Select an installation position for the mounting brackets as required: near the power supply side or port side.

2. Attach the front mounting brackets to the chassis:

a. Align the round holes in the wide flange of one front mounting bracket with the screw holes in the chassis. See Figure2-6 and Figure2-7.

b. Use M4 screws (provided with the switch) to attach the front mounting bracket to the chassis.

c. Repeat the preceding two steps to attach the other front mounting bracket to the chassis.

Figure2-6 Attaching the front mounting bracket to the installation position near the port side

Figure2-7 Attaching the front mounting bracket to the installation position near the power supply side

Mounting the chassis in the rack

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Install cage nuts (user-supplied) in the mounting holes in the rack posts. Make sure the corresponding cage nuts on the left and right front rack posts are at the same height.

3. One person holds the switch chassis and aligns the installation holes on the mounting brackets with the cage nuts on the rack posts.

4. The other person uses M6 screws (user supplied) to attach the mounting brackets to the rack.

Figure2-8 Mounting the switch in the rack (front mounting brackets near the port side)

Figure2-9 Mounting the switch in the rack (front mounting brackets near the power supply side)

Rack-mounting the switch by using front and rear mounting brackets

The S6520X-26MC-UPWR-SI, S6520X-26XC-UPWR-SI, and S6520X-54XC-UPWR-SI switches support rack mounting by using front and rear mounting brackets. The following procedure rack-mounts an S6520X-26MC-UPWR-SI switch.

Attaching the front mounting brackets and shoulder screws to the switch

The switch provides two installation positions on its side for the front mounting brackets. One is near the power supply side and the other is near the port side. The following procedure attaches the front mounting brackets to the installation position near the port side. The power supply side mounting is similar.

To attach the front mounting brackets and shoulder screws to the switch:

1. Align the round holes in the wide flange of one front mounting bracket with the screw holes in the chassis. See Figure2-10.

2. Use M4 screws (supplied with the switch) to attach the front mounting bracket to the chassis.

3. Repeat the preceding two steps to attach the other front mounting bracket to the chassis.

4. Unpack the shoulder screws and attach them to the chassis.

Two installation positions as red-marked in Figure2-10 are available for shoulder screws. Select one as required.

Figure2-10 Attaching the front mounting brackets and shoulder screws to the chassis

Attaching the rear mounting brackets to the rack

1. Determine the switch installation position in the rack.

2. Install cage nuts in the rear rack posts. Make sure the corresponding cage nuts on the left and right front rack posts are at the same height.

3. Orient the rear mounting brackets with the wide flange inside or outside the rack as required.

4. Use M6 screws to attach the rear mounting brackets to the rear posts, as shown in Figure2-11.

Do not fully tighten the M6 screws before mounting the switch in the rack.

Figure2-11 Attaching the rear mounting brackets to the rack with the wide flange inside the rack

Figure2-12 Attaching the rear mounting brackets to the rack with the wide flange outside the rack

Mounting the switch in the rack

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Make sure the front mounting brackets and shoulder screws are securely attached to the two sides of the switch.

3. Attach cage nuts (user supplied) to the front rack posts. Make sure the corresponding cage nuts on the left and right rear rack posts are at the same height.

4. One person supports the chassis bottom with one hand, holds the front part of the chassis with the other, and pushes the chassis into the rack gently. Make sure the shoulder screws rest firmly on the upper edge of the rear mounting brackets. See Figure2-13 and Figure2-14.

5. The other person attaches the front mounting brackets with M6 screws (user-supplied) to the front rack posts. Make sure the switch is installed securely in the rack. See Figure2-13 and Figure2-14.

Figure2-13 Mounting the switch in the rack (with the wide flange of the rear mounting brackets inside the rack)

Figure2-14 Mounting the switch in the rack (with the wide flange of the rear mounting brackets outside the rack)

Mounting the switch on a workbench

IMPORTANT:

· Reserve a minimum clearance of 10 cm (3.9 in) around the chassis for heat dissipation.

· Do not place heavy objects on the switch.

To mount the switch on a workbench:

1. Verify that the workbench is sturdy and reliably grounded.

2. Place the switch with bottom up, and clean the round holes in the chassis bottom with dry cloth.

3. Attach the rubber feet to the four round holes in the chassis bottom.

4. Place the switch with upside up on the workbench.

Grounding the switch

WARNING!

Correctly connecting the switch grounding cable is crucial to lightning protection, ESD, and EMI protection. For information about lightning protection, see H3C Network Devices Lightning Protection Guide.

To protect against the following types of issues, use a grounding cable to connect the switch to the earthing facility at the installation site:

· Bodily injury from electric shocks.

· Device and power and data line damages.

· Electrical fires, lightning strokes, electromagnetic coupling interferences, and ESD damages.

You can ground the switch in one of the following ways, depending on the grounding conditions available at the installation site:

· Grounding the switch with a grounding strip

· Grounding the switch with a grounding conductor buried in the earth ground

NOTE:

The power and grounding terminals in this section are for illustration only.

Grounding the switch with a grounding strip

CAUTION:

· Connect the grounding cable to the grounding strip in the equipment room. Do not connect it to a fire main or lightning rod.

· To guarantee the grounding effect and avoid switch damage, use the grounding cable provided with the switch to connect the switch to a grounding strip in the equipment room.

If a grounding strip is available at the installation site, use the grounding cable provided with the switch to connect the switch to the grounding strip.

Connecting the grounding cable to the chassis

Two types of grounding cables are available for the switch, as shown in Figure2-15 and Figure2-16.

To connect the grounding cable to the chassis:

1. Remove the grounding screw from the grounding hole in the rear panel of the chassis.

2. Use the grounding screw to attach the ring terminal of the grounding cable to the grounding screw hole. Fasten the screw.

Figure2-15 Connecting the grounding cable to the chassis (1)

(1) Grounding screw	(2) Ring terminal
(3) Grounding sign	(4) Grounding hole
(5) Grounding cable

Figure2-16 Connecting the grounding cable to the chassis (2)

(1) Grounding cable	(2) Grounding sign
(3) Grounding hole	(4) Ring terminal
(5) Grounding screw

Connecting the grounding cable to a grounding strip

1. Cut the grounding cable to a length required for connecting to the grounding strip.

2. Use diagonal pliers to strip 20 mm (0.79 in) of insulation off the end of the grounding cable. Then use needle-nose pliers to bend the bare metal part to the shape as shown in Figure2-17. Make sure the bended part can securely attached to the grounding post on the grounding strip.

3. Attach the bended part of the grounding cable to the grounding post and use the hex nut to fasten the bended part to the post.

Figure2-17 Connecting the grounding cable to a grounding strip

(1) Grounding post	(2) Grounding strip
(3) Grounding cable	(4) Hex nut

Grounding the switch with a grounding conductor buried in the earth ground

If the installation site does not have grounding strips, but earth ground is available, hammer a 2.5 m (8.20 ft) or longer angle iron or steel tube into the earth ground to act as a grounding conductor. Make sure a minimum of 0.7 m (2.30 ft) is left between the top of the grounding conductor and the ground. In cold areas, bury the grounding conductor below the frozen soil layer. In areas with thin soil or rocky gravel, determine the depth for burying the grounding conductor based on the actual condition.

If zinc-coated steel is used, the following dimensions requirements must be met:

· Angle iron—A minimum of 50 × 50 × 5 mm (1.97 × 1.97 × 0.20 in).

· Steel tube—A minimum of 3.5 mm (0.14 in) in thickness.

· Flat steel—A minimum of 40 × 4 mm (1.57 × 0.16 in).

· Round steel—A minimum of 10 mm (0.39 in).

Figure2-18 Grounding the switch by burying the grounding conductor into the earth ground

(1) Grounding screw	(2) Chassis rear panel	(3) Grounding cable
(4) Welding point	(5) Grounding conductor	(6) Earth

Verifying the grounding connection

· If you ground the switch by using a grounding strip, perform the following tasks:

a. Use a multimeter to measure the resistance between the switch grounding terminal and grounding point, and make sure the resistance is less than 0.1W.

b. Use a grounding resistance tester to measure the grounding resistance of the grounding strip, and make sure the grounding resistance is less than 1W.

· If you ground the switch by using a grounding conductor buried in the earth ground, perform the following tasks:

c. Use a multimeter to measure the resistance between the switch grounding terminal and grounding point, and make sure the resistance is less than 0.1W.

d. Use a grounding resistance tester to measure the grounding resistance of the grounding conductor such as an angle iron in the ground, and make sure the grounding resistance is less than 10W. For locations with high soil resistivity, sprinkle some resistance reducer to reduce soil resistivity or replace soil around the grounding strip with soil with lower resistance.

For information about grounding resistance measurement, see H3C Network Devices Lightning Protection Guide.

Installing and removing a fan tray

The S6520X-26XC-UPWR-SI and S6520X-54XC-UPWR-SI switches each comes with empty fan tray slots and supports the LSPM1FANSB fan trays.

To ensure good ventilation of the switch, follow these guidelines to install and remove fan trays:

· The LSPM1FANSB fan tray provides port-side intake and power supply-side exhaust airflows. The fan tray handle is red. Select the LSPM1FANSB fan trays for the switch based on the ventilation requirements at the installation site.

· Before powering on the switch, make sure all fan tray slots have fan trays installed and the fan trays are the same model.

· Make sure all slots have a module or filler panel installed when the switch is operating.

· For an S6520X-26XC-UPWR-SI switch, if both fan trays fail during the switch operation, replace them within two minutes.

· For an S6520X-54XC-UPWR-SI switch, if more than one fan tray fail during the switch operation, replace the faulty fan trays one by one and finish replacing a fan tray within three minutes.

· If one fan tray fails while the switch is operating, perform either of the following tasks:

¡ If the ambient temperature is not higher than 27°C (80.6°F), replace the fan tray within 24 hours and make sure the failed fan tray is in position before the replacement.

¡ If the ambient temperature is higher than 27°C (80.6°F), replace the fan tray immediately.

Installing a fan tray

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Unpack the fan tray and verify that the fan tray model is as required.

3. Orient the fan tray with the TOP mark facing up.

4. Align the fan tray with the fan tray slot. Holding the fan tray handles, slide the fan tray into the slot along the guide rails. Make sure the fan tray is fully seated in the slot and has a firm contact with the backplane.

To prevent damage to the fan tray or the connectors in the chassis, insert the fan tray gently. If you encounter a hard resistance while inserting the fan tray, pull out the fan tray and insert it again.

Figure2-19 Installing a fan tray

Removing a fan tray

WARNING!

· Do not touch bare wires or terminals on the fan trays.

· Do not place the fan tray in moist place. Prevent liquid from entering the fan tray.

· Contact H3C Support if the circuits or components on a fan tray are faulty. Do not remove any fan tray components.

To remove a fan tray:

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Holding the fan tray handles, pull the fan tray slowly out of the slot along the guide rails.

3. Put the removed fan tray in an antistatic bag.

Figure2-20 Removing a fan tray

Installing and removing a power supply

WARNING!

· To avoid bodily injury or switch damage, strictly follow the procedures in Figure2-21 and Figure2-22 to install and remove a power supply.

· You must provide a circuit breaker for each power supply.

Figure2-21 Installation procedure

Figure2-22 Removal procedure

The S6520X-SI switches (except the S6520X-10XT-SI and S6520X-16XT-SI) each provide two power supply slots. It comes with power supply slot 1 empty and power supply slot 2 installed with a filler panel. You can install one or two power supplies for the switch as required. For the power supplies available for the switch and their specifications, see power supplies in Hardware Information and Specifications.

IMPORTANT:

· An S6520X-18C-SI switch can only use PSR150-A1 or PSR150-D1 power supplies for power supply when it is installed with an LSPM6FWD firewall module.

· An S6520X-26C-SI switch can only use PSR150-A1 or PSR150-D1 power supplies for power supply when it is installed with an LSWM2SP8P, LSWM4SP8PM, LSWM2MGT8P or LSWM2XMGT8P interface module, or an LSPM6FWD firewall module.

Installing and removing a PSR75-12A, PSR150-A1, or PSR150-D1

The installation and removal procedures are the same for the PSR75-12A, PSR150-A1, and PSR150-D1 power supplies. The following procedure installs and removes a PSR75-12A power supply.

Installing a power supply

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Remove the filler panel, if any, from the target power supply slot.

Use a Phillips screwdriver to remove the screws on the filler panel and then remove the filler panel.

Figure2-23 Removing the filler panel from the target power supply slot

3. Unpack the power supply and verify that the power supply model is correct.

4. Correctly orient the power supply. Make sure the lettering on the power supply is upward.

5. Align the power supply with the power supply slot. Grasping the handle of the power supply with one hand and supporting its bottom with the other, slide the power supply slowly into the slot along the guide rails. See callout 1 in Figure2-24.

To prevent damage to the power supply or the connectors on the backplane, insert the power supply gently. If you encounter a hard resistance when inserting the power supply, pull out the power supply and insert it again.

6. Use a Phillips screwdriver to fasten the captive screws on the power supply to secure the power supply in place. See callout 2 in Figure2-24.

If the captive screw cannot be tightly fastened, verify the installation of the power supply.

Figure2-24 Installing a power supply

Removing a power supply

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Disconnect the power cord.

3. Use a Phillips screwdriver to completely loosen the captive screws on the power supply.

4. Grasping the handle of the power supply with one hand, pull the power supply part way out of the slot. Supporting the module bottom with the other, pull the power supply slowly out of the slot along the guide rails.

Put away the removed power supply in an antistatic bag or the power supply package bag for future use.

5. If you are not to install a new power supply in the slot, install a filler panel in the slot to prevent dust and ensure good ventilation.

Installing and removing a PSR360-56A, PSR560-56D, PSR720-56A, or PSR1110-56A

The installation and removal procedures are the same for the PSR360-56A, PSR560-56D, PSR720-56A, and PSR1110-56A power supplies. The following procedure installs and removes a PSR720-56A power supply.

Installing a power supply

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Remove the filler panel, if any, from the target power supply slot.

Hold the round hole on the filler panel and pull the filler panel out of the slot gently along the guide rails.

Figure2-25 Removing the filler panel from the target power supply slot

3. Unpack the power supply. Make sure the power supply model is as required.

Keep the packaging box and packaging bag for the power supply secure for future use.

4. Correctly orient the power supply. Make sure the lettering on the power supply is upward.

Figure2-26 Installing a power supply

Figure2-27 PSR1110-56A power supply installed in the switch

NOTE:

The PSR1110-56A power supply, including the handle, adds 64 mm (2.52 in) to the chassis depth.

Removing a power supply

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Disconnect the power cord.

3. Press the latch on the power supply towards the handle side, and pull the power supply part way out of the slot along the guide rails.

4. Grasping the handle of the power supply with one hand and supporting module bottom with the other, pull the power supply slowly out of the slot along the guide rails.

Put away the removed power supply in an antistatic bag or the power supply package bag for future use.

5. If you are not to install a new power supply in the slot, install a filler panel in the slot to prevent dust and ensure good ventilation.

Figure2-28 Removing a power supply

Connecting the power cord

WARNING!

Provide a circuit breaker for each power input. Make sure the circuit breaker is off before connecting the power cord.

Table2-4 Power source options and power cord connection procedures for the power supplies

Power supply model	Power source option	Power cord connection procedure
Built-in power supply	AC power source	Connecting the power cord for a built-in AC
PSR75-12A/PSR150-A1	AC power source	Connecting the power cord for a PSR75-12A/PSR150-A1
PSR150-D1	–48 VDC power source	Connecting the power cord for a PSR150-D1/PSR560-56D
PSR150-D1	H3C RPS: RPS800-A or RPS1600-A	Connecting the power cord for a PSR150-D1/PSR560-56D
PSR560-56D	–48 VDC power source	Connecting the power cord for a PSR150-D1/PSR560-56D
PSR560-56D	H3C RPS: RPS1600-A	Connecting the power cord for a PSR150-D1/PSR560-56D
PSR360-56A/PSR720-56A/PSR1110-56A	AC power source	Connecting the power cord for a PSR360-56A/PSR720-56A/PSR1110-56A

The power cord for a PSR75-12A or PSR150-A1 power supply is a C13 power cord. The power cord for a PSR360-56A, PSR720-56A, or PSR1110-56A power supply is a C15 power cord (for high-temperature equipment).

Connecting the power cord for a built-in AC power supply

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Attach the two ends of the power cord retainer clip into the two holders at the two sides of the power receptacle, and pull the power cord retainer clip upwards. See Figure2-29.

3. Connect the female connector of the AC power cord supplied with the power supply to the power receptacle. See callout 1 in Figure2-30.

4. Pull the power cord retainer clip downwards to secure the connector to the power receptacle. See callout 2 in Figure2-30.

5. Connect the other end of the power cord to an AC power source.

Figure2-29 Connecting the power cord for a built-in AC power supply (1)

Figure2-30 Connecting the power cord for a built-in AC power supply (2)

Connecting the power cord for a PSR75-12A/PSR150-A1 power supply

The power cord connection procedure is the same for the PSR75-12A and PSR150-A1 power supplies. The following procedure connects the power cord for a PSR75-12A power supply.

To connect the power cord for a PSR75-12A power supply:

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Attach two ends of the power cord retainer clip into the two holes next to the power receptacle on the power supply, and pull the power cord retainer clip leftwards. See Figure2-31.

3. Connect the female connector of the AC power cord supplied with the power supply to the power receptacle. See callout 1 in Figure2-32.

4. Pull the power cord retainer clip rightwards to secure the connector to the power receptacle. See callout 2 in Figure2-32.

5. Connect the other end of the power cord to an AC power source. For a PSR75-12A power supply, you can also connect the power cord to a high-voltage DC power supply source.

Figure2-31 Connecting the power cord for a PSR75-12A power supply (1)

Figure2-32 Connecting the power cord for a PSR75-12A power supply (2)

Connecting the power cord for a PSR150-D1/PSR560-56D power supply

CAUTION:

· To connect a –48 VDC power source in the equipment room for power supply, use the DC power cord provided with the power supply. To connect an RPS for power supply, use an RPS power cord compatible with the RPS.

· Before connecting the power cord to a –48 VDC power source, identify the positive and negative labels on the power cord to ensure correct connections.

The power cord connection procedure is the same for the PSR150-D1 and PSR560-56D power supplies. The following procedure connects the power cord for a PSR150-D1 power supply.

To connect the power cord for a PSR150-D1 power supply:

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Correctly orient the female connector of the DC power cord, and insert the connector into the power receptacle. See callout 1 in Figure2-33.

The DC power receptacle and DC power cord connector form a disorientation rejection structure. If you cannot insert the connector easily into the receptacle, the orientation might be wrong. Remove and reorient the connector.

3. Use a flat-blade screwdriver to fasten the screws on the connector to secure the connector to the power receptacle. See callout 2 in Figure2-33.

4. Connect the other end of the power cord to a –48 VDC power source or an RPS.

Figure2-33 Connecting the power cord for a PSR150-D1 power supply

Connecting the power cord for a PSR360-56A/PSR720-56A/PSR1110-56A power supply

The power cord connection procedure is the same for the PSR360-56A, PSR720-56A, and PSR1110-56A power supplies. The following procedure connects the power cord for a PSR720-56A power supply.

To connect the power cord for a PSR720-56A power supply:

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Plug the female connector of the power cord into the power receptacle on the power supply, as shown by callout 1 in Figure2-34.

3. Use a cable tie to secure the power cord to the handle of the power supply, as shown by callout 2 and callout 3 in Figure2-34.

4. Connect the other end of the power cord to an AC power source.

Figure2-34 Connecting the power cord for a PSR720-56A power supply

Installing and removing an expansion module

CAUTION:

· Do not touch the surface-mounted components on an expansion module directly with your hands.

· Do not use excessive force when you install or remove an expansion module.

· The expansion modules are hot swappable. However, do not install or remove an expansion module while the switch is starting up.

IMPORTANT:

· An S6520X-18C-SI switch must use PSR150-A1 or PSR150-D1 power supplies for power supply when it is installed with an LSPM6FWD firewall module.

· An S6520X-26C-SI switch must use PSR150-A1 or PSR150-D1 power supplies for power supply when it is installed with an LSWM2SP8P, LSWM4SP8PM, LSWM2MGT8P or LSWM2XMGT8P interface module, or an LSPM6FWD firewall module.

The S6520X-18C-SI, S6520X-26C-SI, S6520X-26MC-SI, S6520X-26MC-UPWR-SI, S6520X-26XC-UPWR-SI, and S6520X-54XC-UPWR-SI switches each provide an expansion slot on the rear panel. For the expansion modules available for the switches, see expansion modules in Hardware Information and Specifications.

The installation and removal procedures are similar for expansion modules. The following procedures install and remove LSWM2QP2P (with an ejector lever) and LSPM6FWD (without an ejector lever) expansion modules.

I nstalling an expansion module

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Use a Phillips screwdriver to remove the screw on the filler panel in the target expansion slot. Then remove the filler panel.

Keep the filler panel secure for future use.

Figure2-35 Removing the filler panel from the target expansion slot

3. Unpack the expansion module.

4. If the expansion module has an ejector lever, follow these steps to install it:

a. Fully open the ejector lever, as shown by callout 1 in Figure2-36.

b. Gently push the expansion module into the slot along the guide rails until the expansion module has good contact with the chassis. See callout 2 in Figure2-36.

c. Close the ejector lever, as shown by callout 3 in Figure2-36.

d. Use a Phillips screwdriver to fasten the captive screw on the expansion module to secure the module in the slot. See callout 4 in Figure2-36.

5. If the expansion module does not have an ejector lever, follow these steps to install it:

a. Gently push the expansion module into the slot along the guide rails until the expansion module has good contact with the chassis. See callout 1 Figure2-37.

b. Use a Phillips screwdriver to fasten the captive screw on the expansion module to secure the module in the slot. See callout 2 Figure2-37.

Figure2-36 Installing an expansion module with an ejector lever (LSWM2QP2P)

Figure2-37 Installing an expansion module without an ejector lever (LSPM6FWD)

Figure2-38 LSPM6FWD firewall module installed in the switch

NOTE:

The LSPM6FWD firewall module, including the handle, adds 75 mm (2.95 in) to the chassis depth.

Removing an expansion module

1. Wear an ESD wrist strap. Make sure the strap makes good skin contact and is reliably grounded.

2. Use a Phillips screwdriver to remove the captive screw on the expansion module.

3. (Optional.) If the expansion module has an ejector lever, fully open the ejector lever.

Skip this step if the expansion module does not have an ejector lever.

4. Gently pull the expansion module out of the chassis along the guide rails.

5. If you are not to install a new expansion module, install a filler panel in the slot to prevent dust and ensure good ventilation in the switch.

Verifying the installation

Before powering on the switch, verify the following items:

· There is enough space around the switch for heat dissipation.

· The rack or workbench on which the switch is mounted is stable.

· The grounding cable is securely connected.

· The power source specifications are as required by the device.

· The power cords are correctly connected.

· If part of the network cable for a port is routed outdoors, verify that a network port lightning protector is used for the port.

· If a power line is routed from outdoors, verify that a surge protected power strip is used for the switch.

3 Accessing the switch for the first time

Connecting the switch to a configuration terminal

You can connect the switch to a configuration terminal by using the serial console port or the micro USB console port. Only the micro USB console port takes effect if you connect both the serial console port and micro USB console port.

In Figure3-1, the switch is connected to a configuration terminal (PC as an example) from the serial console port.

Figure3-1 Connecting the switch to a configuration terminal

As shown in Table3-1, three types of console cables can be used for connecting the switch to a configuration terminal. The switch is not provided with a serial console cable or a micro USB console cable.

Table3-1 Connection methods and console cables

Connection method	Console cable type	Configuration terminal-side connector	Switch-side connector
Using the serial console port for connection	DB9-to-RJ45 console cable	DB-9 female connector	RJ-45 connector
Using the serial console port for connection	USB-to-RJ45 console cable	USB connector	RJ-45 connector
Using the micro USB console port for connection	Micro USB console cable	USB connector	Micro USB connector

The signal pinout for the RJ-45 connector of a serial console cable varies by vendor. To avoid abnormal configuration terminal display, use a serial console cable provided by H3C. For more information, see Table3-2. To prepare a serial console cable yourself, make sure the signal pinout for the RJ-45 connector is the same as that shown in Table3-3.

Table3-2 Console cable views

Console cable type	Console cable view	Product code for the recommended H3C console cable
DB9-to-RJ45 console cable		04042967
USB-to-RJ45 console cable		0404A1EE
Micro USB console cable		User supplied,

Connecting a DB9-to-RJ45 console cable

CAUTION:

Follow these guidelines when you connect a DB9-to-RJ45 console cable:

· Identify the mark on the serial console port and make sure you are connecting to the correct port.

· The serial ports on PCs do not support hot swapping. To connect a PC to an operating switch, first connect the PC end. To disconnect a PC from an operating switch, first disconnect the switch end.

A DB9-to-RJ45 serial console cable is an 8-core shielded cable, with a crimped RJ-45 connector at one end for connecting to the serial console port of the switch, and a DB-9 female connector at the other end for connecting to the serial port on a configuration terminal.

Figure3-2 DB9-to-RJ45 console cable

Table3-3 DB9-to-RJ45 console cable signal pinout

RJ-45	Signal	DB-9	Signal
1	RTS	8	CTS
2	DTR	6	DSR
3	TXD	2	RXD
4	SG	5	SG
5	SG	5	SG
6	RXD	3	TXD
7	DSR	4	DTR
8	CTS	7	RTS

To connect the switch to a configuration terminal (for example, a PC) by using a DB9-to-RJ45 console cable:

1. Plug the DB-9 female connector of the DB9-to-RJ45 console cable to the serial port on the PC.

2. Connect the RJ-45 connector to the serial console port on the switch.

Connecting a USB-to-RJ45 console cable

IMPORTANT:

· To use a USB-to-RJ45 console cable to connect the switch to a configuration terminal, first download and install the USB-to-RJ45 console driver on the configuration terminal and then connect the USB-to-RJ45 console cable to the configuration terminal.

· If you have connected a USB-to-RJ45 console cable to the configuration terminal before installing the driver, remove and reconnect the USB-to-RJ45 console cable to the configuration terminal after driver installation.

For information about the signal pinout for the RJ-45 connector of a USB-to-RJ45 console cable, see _Ref108299124.

The following procedure describes how to install the driver on the Windows system. To install the driver on other operating systems, see the installation guide in the driver compression package named by using the corresponding operating system.

To connect the switch to a configuration terminal by using a USB-to-RJ45 console cable:

1. Click the following link, or copy it to the address bar on your browser and download the USB-to-RJ45 console driver.

http://www.h3c.com/en/home/USB_to_RJ45_Console/

2. View the TXT file Read me in the Windows folder to check whether the Windows system of the configuration terminal supports the driver.

3. If the Windows system supports the driver, install PL23XX-M_LogoDriver_Setup_v200_20190815.exe.

4. Click Next on the welcome page of the driver installation wizard.

Figure3-3 Driver installation wizard

5. Click Finish after the drive installation is completed.

Figure3-4 Finishing the driver installation

6. Connect the standard USB connector of the cable to the USB port of the configuration terminal.

7. Connect the RJ-45 connector of the cable to the console port of the switch.

Connecting a micro USB console cable

A micro USB console cable has a micro USB connector at one end to connect to the micro USB console port of the switch, and a standard USB connector at the other end to connect to the USB port on the configuration terminal.

To connect the switch to a configuration terminal, for example a PC, by using a micro USB console cable:

1. Connect the standard USB connector to the USB port of the PC.

2. Connect the micro USB connector to the micro USB console port of the switch.

3. Click the following link, or copy it to the address bar on the browser to log in to download and install the USB console driver on the configuration terminal.

http://www.h3c.com/en/home/USB_Console/

4. Select a driver program according to the operating system you use:

¡ XR21V1410_XR21B1411_Windows_Ver1840_x86_Installer.EXE—32-bit operating system.

¡ XR21V1410_XR21B1411_Windows_Ver1840_x64_Installer.EXE—64-bit operating system.

5. Click Next on the installation wizard.

Figure3-5 Device Driver Installation Wizard

6. Click Continue Anyway.

Figure3-6 Software Installation

7. Click Finish.

Figure3-7 Completing the device driver installation wizard

Setting terminal parameters

To configure and manage the switch through the console port, you must run a terminal emulator program, such as TeraTermPro, on your configuration terminal. You can use the emulator program to connect a network device, a Telnet site, or an SSH site. For more information about the terminal emulator programs, see the user guides for these programs.

Configure the terminal parameters as follows:

· Bits per second—9600.

· Data bits—8.

· Parity—None.

· Stop bits—1.

· Flow control—None.

Starting the switch

Pre-start checklist

Before powering on the switch, verify the following items:

· The power cord is correctly connected.

· The input power voltage is as required by the switch.

· The console cable is correctly connected.

· The PC has started, and the terminal parameters have been correctly configured.

Power on the switch

During the startup process, you can access Boot ROM menus to perform tasks such as software upgrade and file management. The Boot ROM interface and menu options differ with software versions. For more information about Boot ROM menu options, see the software-matching release notes for the device.

After the startup process is completed, you can access the CLI to configure the switch.

For more information about the configuration commands and CLI, see H3C S6520X-SI Switch Series Configuration Guides and H3C S6520X-SI Switch Series Command References.

4 Setting up an IRF fabric

You can use H3C IRF technology to connect and virtualize S6520X-SI switches into a large virtual switch called an "IRF fabric" for flattened network topology, and high availability, scalability, and manageability.

An S6520X-SI switch can set up an IRF fabric only with switches from the same switch series.

IRF fabric setup flowchart

Figure4-1 IRF fabric setup flowchart

To set up an IRF fabric:

Step	Description
1. Plan IRF fabric setup	Plan the installation site and IRF fabric setup parameters: · Planning IRF fabric size and the installation site · Identifying the master switch and planning IRF member IDs · Planning IRF topology and connections · Identifying physical IRF ports on the member switches · Planning the cabling scheme
2. Install IRF member switches	See "Installing the switch in a 19-inch rack" or "Mounting the switch on a workbench."
3. Connect ground wires and power cords	See "Grounding the switch" and "Connecting the power cord."
4. Power on the switches	N/A
5. Configure basic IRF settings	See H3C S6520X-SI Switch Series IRF Configuration Guide or H3C S6520X-SI Switch Series Virtual Technologies Configuration Guide, depending on the software version.
6. Connect the physical IRF ports	Connect physical IRF ports on switches. All switches except the master switch automatically reboot, and the IRF fabric is established.

Planning IRF fabric setup

This section describes issues that an IRF fabric setup plan must cover.

Planning IRF fabric size and the installation site

Choose switch models and identify the number of required IRF member switches, depending on the user density and upstream bandwidth requirements. The switching capacity of an IRF fabric equals the total switching capacities of all member switches.

Plan the installation site depending on your network solution, as follows:

· Place all IRF member switches in one rack for centralized high-density access.

· Distribute the IRF member switches in different racks to implement the ToR access solution for a data center.

NOTE:

For the maximum IRF member devices supported by the switch, see the release notes that come with the switch.

Identifying the master switch and planning IRF member IDs

Determine which switch you want to use as the master for managing all member switches in the IRF fabric.

An IRF fabric has only one master switch. You configure and manage all member switches in the IRF fabric at the CLI of the master switch. IRF member switches automatically elect a master.

You can affect the election result by assigning a high member priority to the intended master switch. For more information about master election, see H3C S6520X-SI Switch Series IRF Configuration Guide or H3C S6520X-SI Switch Series Virtual Technologies Configuration Guide, depending on the software version.

Prepare an IRF member ID assignment scheme. An IRF fabric uses member IDs to uniquely identify and manage its members, and you must assign each IRF member switch a unique member ID.

Planning IRF topology and connections

You can create an IRF fabric in daisy chain topology or more reliable ring topology. In ring topology, the failure of one IRF link does not cause the IRF fabric to split as in daisy chain topology. Instead, the IRF fabric changes to a daisy chain topology without interrupting network services.

You connect the IRF member switches through IRF ports, the logical interfaces for the connections between IRF member switches. Each IRF member switch has two IRF ports: IRF-port 1 and IRF-port 2. To use an IRF port, you must bind a minimum of one physical port to it.

When connecting two neighboring IRF member switches, you must connect the physical ports of IRF-port 1 on one switch to the physical ports of IRF-port 2 on the other switch.

Multiple types of ports (see Table4-1 for the port types) on the S6520X-SI switches can be used for IRF connections. You can bind several IRF physical ports to an IRF port for increased bandwidth and availability.

Figure4-2 and Figure4-3 show the topologies of an IRF fabric made up of three S6520X-26C-SI switches. The IRF port connections in the two figures are for illustration only, and more connection methods are available.

Figure4-2 IRF fabric in daisy chain topology

Figure4-3 IRF fabric in ring topology

Identifying physical IRF ports on the member switches

Identify the physical IRF ports on the member switches according to your topology and connection scheme.

Table4-1 shows the physical ports that can be used for IRF connection and the port use restrictions.

Table4-1 Candidate physical IRF ports and their use restrictions

Chassis	Candidate physical IRF ports	Use restrictions
S6520X-16ST-SI	The following ports on the front panel: · 16 × SFP+ ports · 2 × 1/10GBASE-T autosensing Ethernet ports	· All physical ports to be bound to an IRF port must have the same data rate. · Physical ports on interface modules and the front panel can be bound to the same IRF port. · If a QSFP+ port is split into four virtual SFP+ ports, the QSFP+ port cannot be used as a physical IRF port. · The physical ports must operate at their maximum rate. · The ports on an LSPM4G4T6P interface module cannot be used as IRF physical ports.
S6520X-24ST-SI	The following ports on the front panel: · 24 × SFP+ ports · 2 × 1/10GBASE-T autosensing Ethernet ports on the front panel
S6520X-10XT-SI	The following ports on the front panel: · 2 × SFP+ ports · 8 × 10/5G/2.5G/1000BASE-T autosensing Ethernet ports
S6520X-16XT-SI	The following ports on the front panel: · 2 × SFP+ ports · 14 × 10/5G/2.5G/1000BASE-T autosensing Ethernet ports
S6520X-18C-SI	· 16 × SFP+ ports on the front panel · 1/10GBASE-T autosensing Ethernet ports, 5G/2.5G/1000BASE-T autosensing Ethernet ports, 10G/5G/2.5G/1000BASE-T autosensing Ethernet ports, SFP+ ports, SFP28 ports, or QSFP+ ports on the expansion module
S6520X-26C-SI	· 24 × SFP+ ports on the front panel · 1/10GBASE-T autosensing Ethernet ports, 5G/2.5G/1000BASE-T autosensing Ethernet ports, 10G/5G/2.5G/1000BASE-T autosensing Ethernet ports, SFP+ ports, SFP28 ports, or QSFP+ ports on the expansion module
S6520X-26MC-SI	· 24 × 5G/2.5G/1000/100BASE-T autosensing Ethernet ports on the front panel · 1/10GBASE-T autosensing Ethernet ports, 5G/2.5G/1000BASE-T autosensing Ethernet ports, 10G/5G/2.5G/1000BASE-T autosensing Ethernet ports, SFP+ ports, SFP28 ports, or QSFP+ ports on the expansion module
S6520X-26MC-UPWR-SI	· 24 × 5G/2.5G/1000/100BASE-T autosensing Ethernet ports on the front panel · 1/10GBASE-T autosensing Ethernet ports, 5G/2.5G/1000BASE-T autosensing Ethernet ports, 10G/5G/2.5G/1000BASE-T autosensing Ethernet ports, SFP+ ports, SFP28 ports, or QSFP+ ports on the expansion module
S6520X-26XC-UPWR-SI	· 24 × 10G/5G/2.5G/1000/100BASE-T autosensing Ethernet ports on the front panel · 1/10GBASE-T autosensing Ethernet ports, 5G/2.5G/1000BASE-T autosensing Ethernet ports, 10G/5G/2.5G/1000BASE-T autosensing Ethernet ports, SFP+ ports, SFP28 ports, or QSFP+ ports on the expansion module
S6520X-54XC-UPWR-SI	· 48 × 10G/5G/2.5G/1000/100BASE-T autosensing Ethernet ports on the front panel · 4 × QSFP+ ports on the front panel · 5G/2.5G/1000BASE-T autosensing Ethernet ports, 10G/5G/2.5G/1000BASE-T autosensing Ethernet ports, SFP+ ports, SFP28 ports, or QSFP+ ports on the expansion module

Planning the cabling scheme

Use the following cables to connect the IRF physical ports on the switch:

· 5G/2.5G/1000BASE-T autosensing Ethernet port—Category 5e or above twisted pair cable.

· 5G/2.5G/1000/100BASE-T autosensing Ethernet port—Category 5e or above twisted pair cable.

· 10G/5G/2.5G/1000BASE-T autosensing Ethernet port—Category 5e or above twisted pair cable.

· 10G/5G/2.5G/1000/100BASE-T autosensing Ethernet port—Category 5e or above twisted pair cable.

· 1/10GBASE-T autosensing Ethernet port—Category 6 or above twisted pair cable.

· SFP+ port—SFP+ transceiver module and optical fiber or SFP+ cable. For the available transceiver module and cable types, see ports in Hardware Information and Specifications.

· SFP28 port—SFP28 transceiver module and optical fiber or SFP28 cable. For the available transceiver module and cable types, see ports in Hardware Information and Specifications.

· QSFP+ port—QSFP+ transceiver modules and optical fiber or QSFP+ cable. For the available transceiver module and cable types, see ports in Hardware Information and Specifications.

For a short-distance IRF connection in an equipment room, use a twisted-pair cable, SFP+ cable, SFP28 cable, or QSFP+ cable.

For a long-distance IRF connection, use SFP+/SFP28/QSFP+ transceiver modules and optical fibers.

The following subsections describe several H3C recommended IRF connection schemes by using SFP+ cables and SFP+ transceiver modules and fibers. All these schemes use a ring topology.

IMPORTANT:

In these schemes, all physical IRF ports are located on the same side. If physical IRF ports are on different sides, you must measure the distance between them to select an appropriate cable.

Connecting the IRF member switches in one rack

Connect the IRF member switches (9 switches in this example) in a rack as shown in Figure4-4. The switches in the ring topology (see Figure4-5) are in the same order as connected in the rack.

Figure4-4 Connecting the switches in one rack

Figure4-5 IRF fabric topology

Connecting the IRF member switches in a ToR solution

You can install IRF member switches in different racks side by side to deploy a top of rack (ToR) solution.

Figure4-6 ToR cabling

Configuring basic IRF settings

After you install the IRF member switches, power on the switches, and log in to each IRF member switch (see H3C S6520X-SI Switch Series Fundamentals Configuration Guide) to configure their member IDs, member priorities, and IRF port bindings.

Follow these guidelines when you configure the switches:

· Assign the master switch higher member priority than any other switch.

· Bind physical ports to IRF port 1 on one switch and to IRF port 2 on the other switch. You perform IRF port binding before or after connecting IRF physical ports depending on the software release.

· To bind the ports on an interface module to an IRF port, you must install the interface module first.

· Execute the display irf configuration command to verify the basic IRF settings.

For more information about configuring basic IRF settings, see H3C S6520X-SI Switch Series IRF Configuration Guide or H3C S6520X-SI Switch Series Virtual Technologies Configuration Guide, depending on the software version.

Connecting the physical IRF ports

Use twisted pair cables, cables, or transceiver modules and fibers to connect the IRF member switches as planned.

Wear an ESD wrist strap when you connect cables or transceiver modules and fibers. For how to connect them, see H3C Transceiver Modules and Network Cables Installation Guide.

Verifying the IRF fabric setup

To verify the basic functionality of the IRF fabric after you finish configuring basic IRF settings and connecting IRF ports:

1. Log in to the IRF fabric through the console port of any member switch.

2. Create a Layer 3 interface, assign it an IP address, and make sure the IRF fabric and the remote network management station can reach each other.

3. Use Telnet, web, or SNMP to access the IRF fabric from the network management station. (See H3C S6520X-SI Switch Series Fundamentals Configuration Guide.)

4. Verify that you can manage all member switches as if they were one node.

5. Display the running status of the IRF fabric by using the commands in Table4-2.

Table4-2 Displaying and maintaining IRF configuration and running status

Task	Command
Display information about the IRF fabric.	display irf
Display all members’ IRF configurations that take effect at a reboot.	display irf configuration
Display IRF fabric topology information.	display irf topology

NOTE:

To avoid IP address collision and network problems, configure a minimum of one multi-active detection (MAD) mechanism to detect the presence of multiple identical IRF fabrics and handle collisions. For more information about MAD detection, see H3C S6520X-SI Switch Series IRF Configuration Guide or H3C S6520X-SI Switch Series Virtual Technologies Configuration Guide, depending on the software version.

5 Maintenance and troubleshooting

Built-in power supply failure

The S6520X-10XT-SI and S6520X-16XT-SI switches use a built-in power supply and support only AC power input.

Symptom

The system status LED (SYS) of the switch is off.

Solution

To resolve the issue:

1. Verify that the AC power cord is connected to the switch correctly, and the AC-input power receptacle on the switch and the AC power outlet are in good condition.

2. Verify that the AC power source is operating correctly.

3. Verify that the operating temperature of the switch is in the acceptable range, and the power supply has good ventilation. Over-temperature can cause the power supply to stop working and enter self-protection mode.

4. If the issue persists, contact H3C Support.

Removable power supply failure

The S6520X-SI switches (except the S6520X-10XT-SI and S6520X-16XT-SI) use removable power supplies.

To identify the operating status of a power supply on an S6520X-16ST-SI, S6520X-24ST-SI, S6520X-18C-SI, S6520X-26C-SI, or S6520X-26MC-SI switch, observe the PWR1 or PWR2 LED on the front panel. For more information about the PWR1 and PWR2 LEDs, see LEDs in Hardware Information and Specifications.

To identify the operating status of a power supply on an S6520X-26MC-UPWR-SI, S6520X-26XC-UPWR-SI, or S6520X-54XC-UPWR-SI switch, observe the PWR1 or PWR2 LED on the front panel and the LED on the power supply. For more information about the PWR1 and PWR2 LEDs, see LEDs in Hardware Information and Specifications. For more information about the LED on the power supply, see H3C PSR360-56A Power supply User Manual, H3C PSR560-56D Power supply User Manual, H3C PSR720-56A Power supply User Manual, and H3C PSR1110-56A Power supply User Manual.

Symptom

The PWR LED for a power supply is not steady green.

Solution

To resolve the issue:

1. Verify that the power cord is correctly connected.

2. Verify that the power source meets the requirement.

3. Verify that the operating temperature of the switch is in an acceptable range and the power supply has good ventilation.

4. If the issue persists, contact H3C Support.

To replace a power supply, see "Installing and removing a ."

Fan tray failure

The S6520X-SI switches (except the S6520X-26XC-UPWR-SI and S6520X-54XC-UPWR-SI) use built-in fan trays. If a fan tray fails, contact H3C Support.

The S6520X-26XC-UPWR-SI and S6520X-54XC-UPWR-SI switches use removable fan trays. If an LSPM1FANSB fan tray fails, the fan tray status LED flashes and the switch outputs an alarm message. You can see "Verifying the grounding connection

If you ground the switch by using a grounding strip, perform the following tasks:

a. Use a multimeter to measure the resistance between the switch grounding terminal and grounding point, and make sure the resistance is less than 0.1W.

b. Use a grounding resistance tester to measure the grounding resistance of the grounding strip, and make sure the grounding resistance is less than 1W.

· If you ground the switch by using a grounding conductor buried in the earth ground, perform the following tasks:

c. Use a multimeter to measure the resistance between the switch grounding terminal and grounding point, and make sure the resistance is less than 0.1W.

For information about grounding resistance measurement, see H3C Network Devices Lightning Protection Guide.

Installing and removing a fan tray" to replace the fan tray.

Configuration terminal issues

If the configuration environment setup is correct, the configuration terminal displays booting information when the switch is powered on. If the setup is incorrect, the configuration terminal displays nothing or garbled text.

No display

Symptom

The configuration terminal does not have display when the switch is powered on.

Solution

To resolve the issue:

1. Verify that the power supply is supplying power to the switch correctly.

2. Verify that the console cable is correctly connected.

3. Verify that the console cable does not have any issues and the terminal settings are correct.

4. If the issue persists, contact H3C Support.

Garbled display

Symptom

The display on the configuration terminal is garbled.

Solution

To resolve the issue:

1. Verify that the following settings are configured for the terminal:

¡ Baud rate—9600.

¡ Data bits—8.

¡ Stop bits—1.

¡ Parity—None.

¡ Flow control—None.

2. If the issue persists, contact H3C Support.

H3C S6520X-SI Switch Series Installation Guide-6W107

1 Preparing for installation

Safety recommendations

Examining the installation environment

Attaching the front mounting brackets to the switch

Mounting the chassis in the rack

Attaching the front mounting brackets and shoulder screws to the switch

Attaching the rear mounting brackets to the rack

Mounting the switch in the rack

Connecting the grounding cable to a grounding strip

Verifying the grounding connection

Installing and removing a power supply

Installing a power supply

Installing a power supply

Removing a power supply

Connecting the power cord for a built-in AC power supply

Connecting the power cord for a PSR75-12A/PSR150-A1 power supply

Connecting the power cord for a PSR150-D1/PSR560-56D power supply

Connecting the power cord for a PSR360-56A/PSR720-56A/PSR1110-56A power supply

Installing and removing an expansion module

Installing an expansion module

Removing an expansion module

Starting the switch

IRF fabric setup flowchart

Planning IRF fabric setup

Connecting the IRF member switches in one rack

Connecting the IRF member switches in a ToR solution

Symptom

Solution

Symptom

Solution

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