Cisco Nexus 9348GC-FXP Service Manual

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Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

First Published: 2017-09-27

Last Modified: 2018-03-01

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THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.

THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.

The following information is for FCC compliance of Class A devices: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case users will be required to correct the interference at their own expense.

The following information is for FCC compliance of Class B devices: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If the equipment causes interference to radio or television reception, which can be determined by turning the equipment off and on, users are encouraged to try to correct the interference by using one or more of the following measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for help.

Modifications to this product not authorized by Cisco could void the FCC approval and negate your authority to operate the product

The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.

NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED "AS IS" WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE.

IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topologydiagrams,andotherfiguresincludedinthedocumentareshownforillustrativepurposesonly. AnyuseofactualIPaddressesorphonenumbersinillustrativecontentisunintentional and coincidental.

CiscoandtheCiscologoaretrademarksorregisteredtrademarksofCiscoand/oritsaffiliatesintheU.S. andothercountries. ToviewalistofCiscotrademarks,gotothisURL: www.cisco.com go trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1721R)

P R E F A C E

C H A P T E R 1

C H A P T E R 2

C H A P T E R 3

C O N T E N T S

Trademarks ?

Preface vii

Audience vii

Documentation Conventions vii

Preface

•Audience, on page vii

•Documentation Conventions, on page vii

•Related Documentation, on page viii

•Documentation Feedback, on page x

•Obtaining Documentation and Submitting a Service Request, on page x

Audience

This publication is for hardware installers and network administrators who install, configure, and maintain Cisco Nexus switches.

Documentation Conventions

Command descriptions use the following conventions:

Convention	Description
bold	Bold text indicates the commands and keywords that you enter literally
	as shown.
Italic	Italic text indicates arguments for which the user supplies the values.
[x]	Square brackets enclose an optional element (keyword or argument).
[x \| y]	Squarebracketsenclosingkeywordsorargumentsseparatedbyavertical
	bar indicate an optional choice.
{x \| y}	Braces enclosing keywords or arguments separated by a vertical bar
	indicate a required choice.
[x {y \| z}]	Nested set of square brackets or braces indicate optional or required
	choices within optional or required elements. Braces and a vertical bar
	within square brackets indicate a required choice within an optional
	element.
variable	Indicates a variable for which you supply values, in context where italics
	cannot be used.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

vii

Preface

Documentation Feedback

Cisco Application Centric Infrastructure (ACI) Simulator Documentation

The following Cisco ACI Simulator documentation is available at https://www.cisco.com/c/en/us/support/cloud-systems-management/application-centric-infrastructure-simulator/tsd-products-support-series-home.html.

•Cisco ACI Simulator Release Notes

•Cisco ACI Simulator Installation Guide

•Cisco ACI Simulator Getting Started Guide

Cisco Nexus 9000 Series Switches Documentation

The Cisco Nexus 9000 Series Switches documentation is available at https://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/tsd-products-support-series-home.html.

Cisco Application Virtual Switch Documentation

The Cisco Application Virtual Switch (AVS) documentation is available at https://www.cisco.com/c/en/us/support/switches/application-virtual-switch/tsd-products-support-series-home.html.

Documentation Feedback

Toprovidetechnicalfeedbackonthisdocument,ortoreportanerrororomission,pleasesendyourcomments to apic-docfeedback@cisco.com. We appreciate your feedback.

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service request, and gathering additional information, see What's New in Cisco Product Documentation, at: https://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.

Subscribe to What's New in Cisco Product Documentation, which lists all new and revised Cisco technical documentation as an RSS feed and delivers content directly to your desktop using a reader application. The RSS feeds are a free service.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

C H A P T E R 1

Overview

• Overview, on page 1

Overview

The Cisco Nexus 9348GC-FXP switch (N9K-C9348GC-FXP) is a 1-RU fixed-port, L2/L3 switch, designed for ACI deployments. This switch has 48 100/1000-Megabit 1GBASE-T host ports, 4 10-/25-Gigabit SFP28 host ports, and 2 40-/100-Gigabit QSFP28 uplink ports. The chassis for this switch includes the following user-replaceable components:

•Fan modules (three) with the following airflow choices:

•Port-side intake airflow with burgundy coloring (NXA-FAN-30CFM-B)

•Port-side exhaust airflow with blue coloring (NXA-FAN-30CFM-F)

•Power supply modules (two—one for operations and one for redundancy [1+1]) with the following choices (do not mix AC and DC power sources and do not mix airflow directions):

•350-W AC power supply with port-side intake airflow (burgundy coloring) (NXA-PAC-350W-PI)

•350-W AC power supply with port-side exhaust airflow (blue coloring) (NXA-PAC-350W-PE)

•440-WDCpowersupplywithport-sideexhaustairflow(burgundycoloring)(NXA-PDC-440W-PI)

•440-W DC power supply with port-side exhaust airflow (blue coloring) (NXA-PDC-440W-PE)

The following figure shows the hardware features seen from the port side of the chassis.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Overview

1	Port lane select button	4	10-/25-Gigabit SFP28 host ports (4)
2	ChassisLEDs(Beacon[BCN],Status[STS],and	5	40-/100-Gigabit QSFP28 uplink ports (2)
	Environment [ENV])
3	100-/1000-Megabit 1GBASE-T host ports (48)	6	Screw holes (6) for attaching rack mounting
			brackets

Todeterminewhichtransceivers,adapters,andcablesthisswitchsupports,seethe CiscoTransceiverModules Compatibility Information document.

The following figure shows the hardware features seen from the power supply side of the chassis.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Overview

1	Management port (RJ-45 port)	6	ChassisLEDs(Beacon[BCN]andStatus[STS])
2	Console port (RS-232 port)	7	Fan module (3) with fan slot 1 on the left and fan
			slot 3 on the right
3	Management port (SFP port)	8	Powersupply(2)oneusedforoperationsandone
			used for redundancy, with power supply slot 1
			on the left and slot 2 on the right
4	Grounding pad	9	Screw holes (6) for attaching rack mounting
			brackets

5USB port

Note USBsupportislimitedtoUSB2.0devicesthatuselessthan2.5W(lessthan0.5Ainclusiveofsurgecurrent). Devices, such as external hard drives, that instantaneously draw more than 0.5 A are not supported.

Depending on whether you plan to position the ports in a hot or cold aisle, you can order the fan and power supply modules with port-side intake or port-side exhaust airflow. To determine the airflow direction of the modules installed in your switch, see the following table.

Replaceable Modules	Port-Side Intake Airflow Coloring	Port-Side Exhaust Airflow Coloring
Fans	Burgundy	Blue
AC power supplies	Burgundy	Blue

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Overview

Thefanandpowersupplymodulesarefieldreplaceable. Youcanreplaceonefanmoduleoronepowersupply module during operations, so long as the other modules are installed and operating. If you have only one power supply installed, you can install the replacement power supply in the open slot before removing the original power supply.

Note All of the fan and power supply modules must have the same direction of airflow. Otherwise, the switch can overheat and shut down. If you are installing a dual-direction power supply, that module automatically uses the same airflow direction as the other modules in the switch.

Caution If the switch has port-side intake airflow (burgundy coloring for fan modules), you must locate the ports in the cold aisle. If the switch has port-side exhaust airflow (blue coloring for fan modules), you must locate the ports in the hot aisle. If you locate the air intake in a hot aisle, the switch can overheat and shut down.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

C H A P T E R 2

Preparing the Site

•Temperature Requirements, on page 5

•Humidity Requirements, on page 5

•Altitude Requirements, on page 5

•Dust and Particulate Requirements, on page 6

•Minimizing Electromagnetic and Radio Frequency Interference, on page 6

•Shock and Vibration Requirements, on page 7

•Grounding Requirements, on page 7

•Planning for Power Requirements, on page 7

•Airflow Requirements, on page 8

•Rack and Cabinet Requirements, on page 9

•Clearance Requirements, on page 10

Temperature Requirements

The switch requires an operating temperature of 32 to 104 degrees Fahrenheit (0 to 40 degrees Celsius). If theswitchisnotoperating,thetemperaturemustbebetween –40to158degreesFahrenheit(–40to70degrees Celsius).

Humidity Requirements

High humidity can cause moisture to enter the switch. Moisture can cause corrosion of internal components and degradation of properties such as electrical resistance, thermal conductivity, physical strength, and size. The switch is rated to withstand from 5- to 95-percent (non-condensing) relative humidity.

Buildings in which the climate is controlled by air-conditioning in the warmer months and by heat during the colder months usually maintain an acceptable level of humidity for the switch equipment. However, if the switch is located in an unusually humid location, you should use a dehumidifier to maintain the humidity within an acceptable range.

Altitude Requirements

The following table lists the maximum altitude that this switch is tested to operate. This switch is rated to operate at altitudes from 0 to 13,123 feet (0 to 4,000 meters). If you operate this switch at a higher altitude

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Preparing the Site

Dust and Particulate Requirements

(lowpressure),theefficiencyofforcedandconvectioncoolingisreducedandcanresultinelectricalproblems that are related to arcing and corona effects. This condition can also cause sealed components with internal pressure, such as electrolytic capacitors, to fail or to perform at a reduced efficiency.

Dust and Particulate Requirements

Exhaust fans cool power supplies and system fans cool switches by drawing in air and exhausting air out throughvariousopeningsinthechassis. However,fansalsoingestdustandotherparticles,causingcontaminant buildup in the switch and increased internal chassis temperature. A clean operating environment can greatly reducethenegativeeffectsofdustandotherparticles,whichactasinsulatorsandinterferewiththemechanical components in the switch.

In addition to regular cleaning, follow these precautions to avoid contamination of your switch:

•Do not permit smoking near the switch.

•Do not permit food or drink near the switch.

Minimizing Electromagnetic and Radio Frequency Interference

Electromagnetic interference (EMI) and radio frequency interference (RFI) from the switch can adversely affect other devices, such as radio and television (TV) receivers, operating near the switch. Radio frequencies that emanate from the switch can also interfere with cordless and low-power telephones. Conversely, RFI from high-power telephones can cause spurious characters to appear on the switch monitor.

RFIisdefinedasanyEMIwithafrequencyabove10kHz. Thistypeofinterferencecantravelfromtheswitch to other devices through the power cable and power source or through the air as transmitted radio waves. The Federal Communications Commission (FCC) publishes specific regulations to limit the amount of EMI and RFI that can be emitted by computing equipment. Each switch meets these FCC regulations.

To reduce the possibility of EMI and RFI, follow these guidelines:

•Cover all open expansion slots with a blank filler plate.

•Always use shielded cables with metal connector shells for attaching peripherals to the switch.

When wires are run for any significant distance in an electromagnetic field, interference can occur between the field and the signals on the wires with the following implications:

•Bad wiring can result in radio interference emanating from the plant wiring.

•StrongEMI,especiallywhenitiscausedbylightningorradiotransmitters,candestroythesignaldrivers and receivers in the chassis and even create an electrical hazard by conducting power surges through lines into equipment.

Note To predict and prevent strong EMI, you might need to consult experts in radio frequency interference (RFI).

The wiring is unlikely to emit radio interference if you use twisted-pair cable with a good distribution of grounding conductors. If you exceed the recommended distances, use a high-quality twisted-pair cable with one ground conductor for each data signal when applicable.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Preparing the Site

Shock and Vibration Requirements

Caution Ifthewiresexceedtherecommendeddistances,orifwirespassbetweenbuildings,givespecialconsideration to the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic switches. You might want to consult experts in electrical surge suppression and shielding if you had similar problems in the past.

Shock and Vibration Requirements

The switch has been shockand vibration-tested for operating ranges, handling, and earthquake standards.

Grounding Requirements

The switch is sensitive to variations in voltage supplied by the power sources. Overvoltage, undervoltage, and transients (or spikes) can erase data from memory or cause components to fail. To protect against these typesofproblems,ensurethatthereisanearth-groundconnectionfortheswitch.Youcanconnectthegrounding pad on the switch either directly to the earth-ground connection or to a fully bonded and grounded rack.

Whenyouproperlyinstallthechassisinagroundedrack,theswitchisgroundedbecauseithasametal-to-metal connection to the rack. Alternatively, you can ground the chassis by using a customer-supplied grounding cable that meets your local and national installation requirements (we recommend 6-AWG wire for U.S. installations) connected to the chassis with a grounding lug (provided in the switch accessory kit) and to the facility ground.

Note You automatically ground AC power supplies when you connect them to AC power sources. For DC power supplies, you must connect a grounding wire when wiring the power supply to the DC power source.

Planning for Power Requirements

The switch includes two power supplies (1-to-1 redundancy with current sharing) in one of the following combinations:

•Two 350-W AC power supplies

•Two 440-W DC power supplies

Note For n+1 redundancy, you can use one or two power sources for the two power supplies. For n+n redundancy, you must use two power sources and connect each power supply to a separate power source.

Thepowersuppliesareratedtooutputupto350W(ACpowersupplies)orupto440W(DCpowersupplies), but the switch requires less than those amounts of power from the power supply. To operate the switch you mustprovisionenoughpowerfromthepowersourcetocovertherequirementsofboththeswitchandapower

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Preparing the Site

Airflow Requirements

supply. Typically, this switch and a power supply require about 200 W of power input from the power source, but you must provision as much as 443 W power input from the power source to cover peak demand.

Note Some of the power supply modules have Underwriter Labs (UL) rating capabilities that exceed the switch requirements. When calculating power requirements, use the switch requirements to determine the amount of power required for the power supplies.

To minimize the possibility of circuit failure, make sure that each power-source circuit used by the switch is dedicated to the switch.

Note For AC input application, please refer to the statement below:

Warning Statement 1005—Circuit Breaker

Note

Warning

Note

This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the protective devices are rated not greater than 20A (North America), 16A (Europe), and 13A (UK).

For DC input application, please refer to the statement below:

Statement 1005—Circuit Breaker

This product relies on the building's installation for short-circuit (overcurrent) protection.

•Ensurethattheprotectivedevicesareratednotgreaterthan40Awhentheswitchispoweredwithregular DC power supplies (rated 48-60VDC).

•Ensurethattheprotectivedevicesareratednotgreaterthan10AwhentheswitchispoweredwithHVDC power supplies (rated 240-350VDC).

For the power cables to use with the power supplies, see Power Cable Specifications, on page 44.

Airflow Requirements

The switch is designed to be positioned with its ports in either the front or the rear of the rack depending on your cabling and maintenance requirements. Depending on which side of the switch faces the cold aisle, you must have fan and power supply modules that move the coolant air from the cold aisle to the hot aisle in one of the following ways:

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Preparing the Site

Rack and Cabinet Requirements

•Port-side exhaust airflow—Coolant air enters the chassis through the fan and power supply modules in the cold aisle and exhausts through the port end of the chassis in the hot aisle.

•Port-sideintakeairflow—Coolantairentersthechassisthroughtheportendinthecoldaisleandexhausts through the fan and power supply modules in the hot aisle.

You can identify the airflow direction of each fan and power supply module by its coloring as follows:

•Blue coloring indicates port-side exhaust airflow.

•Burgundy coloring indicates port-side intake airflow.

Note To prevent the switch from overheating and shutting down, you must position the air intake for the switch in a cold aisle, and all of the fan and power supply modules must have the same direction of airflow (even if their coloring is different). If you must change the airflow direction for the switch, you must shutdown the switch before changing the modules.

Rack and Cabinet Requirements

You can install the following types of racks or cabinets for your switch:

•Standard perforated cabinets

•Solid-walled cabinets with a roof fan tray (bottom-to-top cooling)

•Standard open four-post Telco racks

Work with your cabinet vendors to determine which of their cabinets meet the following requirements or see the Cisco Technical Assistance Center (TAC) for recommendations:

•Use a standard 19-inch (48.3-cm), four-post Electronic Industries Alliance (EIA) cabinet or rack with mountingrailsthatconformtoEnglishuniversalholespacingpersection1oftheANSI/EIA-310-D-1992 standard.

•The depth of a four-post rack must be 24 to 32 inches (61.0 to 81.3 cm) between the front and rear mounting rails (for proper mounting of the bottom-support brackets or other mounting hardware).

•Required clearances between the chassis and the edges of its rack or the interior of its cabinet are as follows:

•4.5 inches (11.4 cm) between the front of the chassis and the interior of the cabinet (required for cabling).

•3.0inches(7.6cm)betweentherearofthechassisandtheinteriorofthecabinet(requiredforairflow in the cabinet if used).

•No clearance is required between the chassis and the sides of the rack or cabinet (no side airflow).

Additionally, you must have power receptacles located within reach of the power cords used with the switch.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

Preparing the Site

Clearance Requirements

Warning Statement 1048—Rack Stabilization

Stability hazard. The rack stabilizing mechanism must be in place, or the rack must be bolted to the floor before you slide the unit out for servicing. Failure to stabilize the rack can cause the rack to tip over.

Clearance Requirements

You must provide the chassis with adequate clearance between the chassis and any other rack, device, or structure so that you can properly install the chassis, route cables, provide airflow, and maintain the switch. For the clearances required for an installation of this chassis in a four-post rack, see the following figure.

1	Chassis	5	Depth of the chassis
2	Vertical rack-mount posts and rails	6	Maximum extension of the bottom-support rails
3	Chassis width	7	Depth of the front clearance area (this equals the
			depth of the chassis)

4Widthofthefrontclearancearea(thisequalsthe width of the chassis with two rack-mount brackets attached to it)

Note Both the front and rear of the chassis must be open to both aisles for airflow.

Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide

+ 46 hidden pages

		Safety 11
		Installation Options with Racks and Cabinets					12
		Airflow Considerations		12
		Installation Guidelines		12
		Unpacking and Inspecting the Switch				13
		Installing the Switch	14
		Installing the Switch into a Two-post Rack					18
		Grounding the Chassis		21
		Starting the Switch	23
C H A P T E R	4	Connecting the Switch to the ACI Fabric				25
		ACI Fabric Topology 25
		Preparing to Connect to Other Devices 26
		Connecting Leaf Switches to APICs				27
		Connecting Leaf Switches to Spine Switches					28
		Setting Up an Optional Console Interface 31
		Setting Up an Optional Management Connection 32
		Maintaining Transceivers and Optical Cables					32
C H A P T E R	5	Replacing Components	35
		Replacing a Fan Module		35
		Removing a Fan Module			35
		Installing a Fan Module			36
		Replacing a Power Supply Module				36
		Replacing an AC Power Supply 36
A P P E N D I X	A	Rack Specifications 39
		Overview of Racks	39

	General Requirements for Cabinets and Racks	39
	Requirements Specific to Standard Open Racks	40
	Requirements Specific to Perforated Cabinets	40
	Cable Management Guidelines 40
A P P E N D I X B	System Specifications 41

Environmental Specifications		41
Switch Dimensions	41
Switch and Module Weights and Quantities						42
Transceiver and Cable Specifications				42
Switch Power Input Requirements			42
Power Specifications	43
350-W AC Power Supply Specifications						43
440-W DC Power Supply Specifications						43
Power Cable Specifications		44
Power Cable Specifications for AC Power Supplies 44
Regulatory Standards Compliance Specifications 45
LEDs 47
Switch Chassis LEDs	47
Fan Module LEDs 48
Power Supply LEDs	48
Additional Kits 49
Rack Mount Kit for a Two-post Rack				49
Rack Mount Kit NXK-ACC-KIT-1RU					49
Rack Mount Kit N3K-C3064-ACC-KIT					50
Accessory Kit 50
Site Preparation and Maintenance Records					53
Site Preparation Checklist 53
Contact and Site Information		54
Chassis and Module Information			55

Convention	Description
string	A nonquoted set of characters. Do not use quotation marks around the
	string or the string will include the quotation marks.
Examples use the following conventions:
Convention	Description
screen font	Terminalsessionsandinformationtheswitchdisplaysareinscreenfont.
boldface screen font	Information you must enter is in boldface screen font.
italic screen font	Arguments for which you supply values are in italic screen font.
< >	Nonprinting characters, such as passwords, are in angle brackets.
[ ]	Default responses to system prompts are in square brackets.
!, #	An exclamation point (!) or a pound sign (#) at the beginning of a line
	of code indicates a comment line.

Overview 1
Preparing the Site 5
Temperature Requirements		5
Humidity Requirements	5
Altitude Requirements	5
Dust and Particulate Requirements			6
Minimizing Electromagnetic and Radio Frequency Interference 6
Shock and Vibration Requirements			7
Grounding Requirements		7
Planning for Power Requirements			7
Airflow Requirements	8
Rack and Cabinet Requirements 9
Clearance Requirements	10
Installing the Switch Chassis	11