Juniper EX9251 User Manual

EX9251 Switch Hardware Guide

Published

2021-01-31

Juniper Networks, Inc. 1133 Innovation Way Sunnyvale, California 94089 USA

408-745-2000 www.juniper.net

JuniperNetworks,theJuniperNetworkslogo,Juniper,andJunosareregisteredtrademarksofJuniperNetworks,Inc. in theUnitedStatesandothercountries. Allothertrademarks,servicemarks,registeredmarks,orregisteredservicemarks are the property of their respective owners.

Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice.

EX9251SwitchHardwareGuide

The information in this document is current as of the date on the title page.

YEAR2000NOTICE

Juniper Networks hardware and software products are Year 2000 compliant. Junos OS has no known time-related limitations through the year 2038. However, the NTP application is known to have some difficulty in the year 2036.

ENDUSERLICENSEAGREEMENT

TheJuniperNetworksproductthatisthesubjectofthistechnicaldocumentationconsistsof(orisintendedforusewith) JuniperNetworkssoftware.UseofsuchsoftwareissubjecttothetermsandconditionsoftheEndUserLicenseAgreement (“EULA”) posted at https://support.juniper.net/support/eula/. By downloading, installing or using such software, you agree to the terms and conditions of that EULA.

iii

AbouttheDocumentation | xi

Documentation and Release Notes | xi

Using the Examples in This Manual | xi

Merging a Full Example | xii

Merging a Snippet | xiii

Documentation Conventions | xiii

Documentation Feedback | xvi

Requesting Technical Support | xvi

Self-Help Online Tools and Resources | xvii

Creating a Service Request with JTAC | xvii

1Overview

EX9251SystemOverview | 19

EX9251 Switch Hardware Overview | 19

Software | 20

Benefits of the EX9251 Switch | 20

EX9251 Switch Models | 20

Front Panel of an EX9251 Switch | 20

Rear Panel of an EX9251 Switch | 22

Routing Engine | 22

Power Supplies | 23

Cooling System | 23

Component Redundancy | 23

EX9251 Switch Models | 24

EX9251 Switch Hardware and CLI Terminology Mapping | 24

EX9251Chassis | 26

Chassis Physical Specifications of an EX9251 Switch | 26

Field-Replaceable Units in an EX9251 Switch | 27

LEDs on the Front Panel of an EX9251 Switch | 27

EX9251CoolingSystem | 33

Fan Trays | 33

Airflow Direction in the EX9251 Switch Chassis | 34

Cooling System in the Power Supplies | 35

Fan Tray Status LEDs | 35

EX9251PowerSystem | 36

Power Supplies in an EX9251 Switch | 36

AC Power Supply Description | 37

AC Power Supply LEDs and Other Components | 38

DC Power Supply Description | 40

DC Power Supply LEDs and Other Components | 40

AC Power Cord Specifications for an EX9251 Switch | 42

Power Requirements for EX9251 Switch Components | 44

Calculating System Thermal Output | 45

Power Supply Specifications for EX9251 Switches | 45

2SitePlanning,Preparation,andSpecifications

SitePreparationChecklistforanEX9251Switch | 48

EX9251SiteGuidelinesandRequirements | 49

Environmental Requirements and Specifications for EX Series Switches | 49

General Site Guidelines | 54

Site Electrical Wiring Guidelines | 55

Clearance Requirements for Airflow and Hardware Maintenance for EX9251 Switches | 56

Rack and Cabinet Requirements for EX9251 Switches | 57

EX9251NetworkCableandTransceiverPlanning | 60

Pluggable Transceivers Supported on EX9251 Switches | 60

SFP+ Direct Attach Copper Cables for EX Series Switches | 61

Cable Specifications | 62

List of DAC Cables Supported on EX Series Switches | 62

Standards Supported by These Cables | 63

QSFP+ Direct Attach Copper Cables for EX Series Switches | 63

Cable Specifications | 64

DAC Cables Supported on EX3400, EX4300, EX4550, EX4600, EX9251, and EX9253 Switches | 64

Understanding EX Series Switches Fiber-Optic Cable Signal Loss, Attenuation, and

Dispersion | 64

Signal Loss in Multimode and Single-Mode Fiber-Optic Cable | 65

Attenuation and Dispersion in Fiber-Optic Cable | 65

Calculating the Fiber-Optic Cable Power Budget for EX Series Devices | 66

Calculating the Fiber-Optic Cable Power Margin for EX Series Devices | 66

EX9251ManagementCableSpecificationsandPinouts | 68

Management Cable Specifications | 69

Specifications of Cables and Wires That Connect to Ports on the Front Panel in an EX9251 Switch | 69

Grounding Cable and Lug Specifications for EX9251 Switches | 70

Grounding Points Specifications for an EX9251 Switch | 70

Grounding Cable Specifications for an EX9251 Switch | 71

Grounding Lug Specifications for an EX9251 Switch | 71

USB Port Specifications for an EX Series Switch | 71

Console Port Connector Pinout Information for an EX9251 Switch | 72

RJ-45 to DB-9 Serial Port Adapter Pinout Information | 73

RJ-45 Management Port Connector Pinout Information | 73

3InitialInstallationandConfiguration

UnpackingandMountingtheEX9251Switch | 76

Unpacking an EX9251 Switch | 76

Parts Inventory (Packing List) for an EX9251 Switch | 77

Installing and Connecting an EX9251 Switch | 79

Mounting an EX9251 Switch on a Rack or Cabinet | 80

Mounting an EX9251 Switch on a 19-in. Rack | 81

Installing an EX9251 Switch in an ETSI Rack | 84

ConnectingtheEX9251toPower | 88

Connect Earth Ground to an EX Series Switch | 88

Parts and Tools Required for Connecting an EX Series Switch to Earth Ground | 89

Special Instructions to Follow Before Connecting Earth Ground to an EX Series Switch | 93

Connecting Earth Ground to an EX Series Switch | 94

Connecting AC Power to an EX9251 Switch and Powering on the Switch | 95

Connecting DC Power to an EX9251 Switch and Powering on the Switch | 99

ConnectingtheEX9251toExternalDevices | 103

Connect a Device to a Network for Out-of-Band Management | 103

Connect a Device to a Management Console Using an RJ-45 Connector | 104

Connecting the EX9251 Switch to External Clocking and Timing Devices | 105

Connecting 1-PPS and 10-MHz Timing Devices to the Switch | 106

Connecting a Time-of-Day Device to the Switch | 107

Connecting a BITS External Clocking Device to the Switch | 107

ConnectingtheEX9251totheNetwork | 108

Install a Transceiver | 108

Connect a Fiber-Optic Cable | 111

ConfiguringJunosOSontheEX9251 | 112

EX9251 Switch Default Configuration | 112

Connecting and Configuring an EX9251 Switch (CLI Procedure) | 113

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4MaintainingComponents

RoutineMaintenanceProceduresforEX9251Switches | 119

Routine Maintenance Procedures for EX9251 Switches | 119

Maintaining the Routing Engine in EX9251 Switches | 119

MaintainingtheEX9251CoolingSystem | 121

Removing a Fan Tray from an EX9251 Switch | 121

Installing a Fan Tray in an EX9251 Switch | 122

Maintaining Fan Trays in EX9251 Switches | 124

MaintainingtheEX9251PowerSystem | 125

Powering Off an EX9251 Switch | 125

Removing an AC Power Supply from an EX9251 Switch | 126

Installing an AC Power Supply in an EX9251 Switch | 128

Removing a DC Power Supply from an EX9251 Switch | 129

Installing a DC Power Supply in an EX9251 Switch | 131

Maintaining Power Supplies in EX9251 Switches | 133

MaintainingTransceivers | 134

Remove a Transceiver | 135

Install a Transceiver | 138

Remove a QSFP28 Transceiver | 140

Install a QSFP28 Transceiver | 142

MaintainFiber-OpticCables | 144

Connect a Fiber-Optic Cable | 144

Disconnect a Fiber-Optic Cable | 145

How to Handle Fiber-Optic Cables | 146

5TroubleshootingHardware

TroubleshootingEX9251Components | 149

Troubleshooting the Cooling System in an EX9251 Switch | 149

Troubleshooting Power Supplies in an EX9251 Switch | 150

Troubleshoot Temperature Alarms in EX Series Switches | 151

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6ContactingCustomerSupportandReturningtheChassisorComponents

ReturninganEX9251ChassisorComponents | 158

Returning an EX9251 Switch or Component for Repair or Replacement | 158

Locating the Serial Number on an EX9251 Switch or Component | 159

Locating the Serial Number ID Label on an EX9251 Switch Chassis | 159

Locating Serial Number ID Labels on FRU Components | 159

Contact Customer Support to Obtain Return Material Authorization | 161

Packing an EX9251 Switch or Component | 162

Packing an EX9251 Switch | 162

Packing EX9251 Switch Components for Shipping | 163

7SafetyandComplianceInformation

GeneralSafetyGuidelinesandWarnings | 167

DefinitionsofSafetyWarningLevels | 168

QualifiedPersonnelWarning | 171

WarningStatementforNorwayandSweden | 172

FireSafetyRequirements | 172

Fire Suppression | 172

Fire Suppression Equipment | 172

InstallationInstructionsWarning | 174

ChassisandComponentLiftingGuidelines | 174

RestrictedAccessWarning | 176

RampWarning | 178

Rack-MountingandCabinet-MountingWarnings | 179

GroundedEquipmentWarning | 185

RadiationfromOpenPortAperturesWarning | 186

LaserandLEDSafetyGuidelinesandWarnings | 187

General Laser Safety Guidelines | 187

Class 1 Laser Product Warning | 188

Class 1 LED Product Warning | 189

Laser Beam Warning | 190

MaintenanceandOperationalSafetyGuidelinesandWarnings | 190

Battery Handling Warning | 192

Jewelry Removal Warning | 193

Lightning Activity Warning | 195

Operating Temperature Warning | 196

Product Disposal Warning | 198

GeneralElectricalSafetyGuidelinesandWarnings | 199

ActiontoTakeAfteranElectricalAccident | 200

PreventionofElectrostaticDischargeDamage | 201

ACPowerElectricalSafetyGuidelines | 202

ACPowerDisconnectionWarning | 204

DCPowerElectricalSafetyGuidelines | 205

DCPowerDisconnectionWarning | 206

DCPowerGroundingRequirementsandWarning | 208

DCPowerWiringSequenceWarning | 210

DCPowerWiringTerminationsWarning | 213

MultiplePowerSuppliesDisconnectionWarning | 216

TNPowerWarning | 217

AgencyApprovalsforEX9251Switches | 217

ComplianceStatementsforEMCRequirementsforEXSeriesSwitches | 219

Canada | 219

Taiwan | 220

European Community | 220

Israel | 220

Japan | 221

Korea | 221

United States | 221

FCC Part 15 Statement | 222

Nonregulatory Environmental Standards | 222

ComplianceStatementsforAcousticNoiseforEXSeriesSwitches | 223

StatementsofVolatilityforJuniperNetworkDevices | 224

AbouttheDocumentation

INTHISSECTION

Documentation and Release Notes | xi

Using the Examples in This Manual | xi

Documentation Conventions | xiii

Documentation Feedback | xvi

Requesting Technical Support | xvi

Use this guide to install hardware and perform initial software configuration, routine maintenance, and troubleshootingfortheEX9251switch.Aftercompletingtheinstallationandbasicconfigurationprocedures covered in this guide, refer to the Junos OS documentation for information about further software configuration.

DocumentationandReleaseNotes

To obtain the most current version of all Juniper Networks® technical documentation, see the product documentation page on the Juniper Networks website at https://www.juniper.net/documentation/.

Iftheinformationinthelatestreleasenotesdiffersfromtheinformationinthedocumentation,followthe product Release Notes.

Juniper Networks Books publishes books by Juniper Networks engineers and subject matter experts. These books go beyond the technical documentation to explore the nuances of network architecture, deployment, and administration. The current list can be viewed at https://www.juniper.net/books.

UsingtheExamplesinThisManual

If you want to use the examples in this manual, you can use the loadmerge or the loadmergerelative command. These commands cause the software to merge the incoming configuration into the current candidateconfiguration.Theexampledoesnotbecomeactiveuntilyoucommitthecandidateconfiguration.

xii

If the example configuration contains the top level of the hierarchy (or multiple hierarchies), the example is a fullexample. In this case, use the loadmerge command.

If the example configuration does not start at the top level of the hierarchy, the example is a snippet. In thiscase,usetheloadmergerelative command.Theseproceduresaredescribedinthefollowingsections.

MergingaFullExample

To merge a full example, follow these steps:

1.From the HTML or PDF version of the manual, copy a configuration example into a text file, save the file with a name, and copy the file to a directory on your routing platform.

For example, copy the following configuration to a file and name the file ex-script.conf. Copy the ex-script.conf file to the /var/tmp directory on your routing platform.

system { scripts {

commit {

file ex-script.xsl;

}

interfaces { fxp0 {

disable; unit 0 {

family inet {

address 10.0.0.1/24;

}

2.Merge the contents of the file into your routing platform configuration by issuing the loadmerge configuration mode command:

[edit]

user@host# loadmerge/var/tmp/ex-script.conf load complete

xiii

MergingaSnippet

To merge a snippet, follow these steps:

1.From the HTML or PDF version of the manual, copy a configuration snippet into a text file, save the file with a name, and copy the file to a directory on your routing platform.

For example, copy the following snippet to a file and name the file ex-script-snippet.conf. Copy the ex-script-snippet.conf file to the /var/tmp directory on your routing platform.

commit {

file ex-script-snippet.xsl; }

2.Movetothehierarchylevelthatisrelevantforthissnippetbyissuingthefollowingconfigurationmode command:

[edit]

user@host# editsystemscripts

[edit system scripts]

3.Merge the contents of the file into your routing platform configuration by issuing the loadmerge relative configuration mode command:

[edit system scripts]

user@host# loadmergerelative/var/tmp/ex-script-snippet.conf load complete

For more information about the load command, see CLI Explorer.

DocumentationConventions

Table 1 on page xiv defines notice icons used in this guide.

xiv

Table1:NoticeIcons
Icon	Meaning	Description
	Informational note	Indicates important features or instructions.
	Caution	Indicates a situation that might result in loss of data or hardware
		damage.
	Warning	Alerts you to the risk of personal injury or death.
	Laser warning	Alerts you to the risk of personal injury from a laser.
	Tip	Indicates helpful information.
	Best practice	Alerts you to a recommended use or implementation.

Table 2 on page xiv defines the text and syntax conventions used in this guide.

Table2:TextandSyntaxConventions

Convention	Description	Examples
Boldtextlikethis	Represents text that you type.	To enter configuration mode, type
		the configure command:
		user@host> configure

Fixed-width text like this

Italictextlikethis

Represents output that appears on the terminal screen.

•Introducesoremphasizesimportant new terms.

•Identifies guide names.

•Identifies RFC and Internet draft titles.

user@host> showchassisalarms

No alarms currently active

•A policy term is a named structure that defines match conditions and actions.

•JunosOSCLIUserGuide

•RFC 1997, BGPCommunities Attribute

Table2:TextandSyntaxConventions (continued)

Convention	Description
Italictextlikethis	Represents variables (options for
	which you substitute a value) in
	commands or configuration
	statements.

Examples

Configure the machine’s domain name:

[edit]

root@# setsystemdomain-name domain-name

Textlikethis	Represents names of configuration
	statements, commands, files, and
	directories; configuration hierarchy
	levels; or labels on routing platform
	components.

•To configure a stub area, include the stub statement at the [edit protocolsospfareaarea-id] hierarchy level.

•The console port is labeled

CONSOLE.

< > (angle brackets)	Encloses optional keywords or
	variables.
\| (pipe symbol)	Indicates a choice between the
	mutually exclusive keywords or
	variablesoneithersideofthesymbol.
	The set of choices is often enclosed
	in parentheses for clarity.

stub<default-metric metric>;

broadcast|multicast

(string1 | string2 | string3)

# (pound sign)

[ ] (square brackets)

Indention and braces ( { } )

; (semicolon)

Indicatesacommentspecifiedonthe	rsvp{#RequiredfordynamicMPLS
same line as the configuration	only
statement to which it applies.
Enclosesavariableforwhichyoucan	communitynamemembers[
substitute one or more values.	community-ids ]
Identifies a level in the configuration	[edit]
hierarchy.	routing-options {
	static {
Identifies a leaf statement at a	route default {
configuration hierarchy level.	nexthop address;
	retain;
	}
	}
	}

GUIConventions

xvi

Table2:TextandSyntaxConventions (continued)
Convention	Description	Examples
Boldtextlikethis	Represents graphical user interface	• IntheLogicalInterfacesbox,select
	(GUI) items you click or select.	AllInterfaces.
		• To cancel the configuration, click
		Cancel.
> (bold right angle bracket)	Separates levels in a hierarchy of	Intheconfigurationeditorhierarchy,
	menu selections.	select Protocols>Ospf.

DocumentationFeedback

We encourage you to provide feedback so that we can improve our documentation. You can use either of the following methods:

•Online feedback system—Click TechLibrary Feedback, on the lower right of any page on the Juniper Networks TechLibrary site, and do one of the following:

•Click the thumbs-up icon if the information on the page was helpful to you.

•Click the thumbs-down icon if the information on the page was not helpful to you or if you have suggestions for improvement, and use the pop-up form to provide feedback.

•E-mail—Sendyourcommentstotechpubs-comments@juniper.net.Includethedocumentortopicname, URL or page number, and software version (if applicable).

RequestingTechnicalSupport

TechnicalproductsupportisavailablethroughtheJuniperNetworksTechnicalAssistanceCenter(JTAC). If you are a customer with an active Juniper Care or Partner Support Services support contract, or are

xvii

covered under warranty, and need post-sales technical support, you can access our tools and resources online or open a case with JTAC.

•JTACpolicies—ForacompleteunderstandingofourJTACproceduresandpolicies,reviewtheJTACUser Guide located at https://www.juniper.net/us/en/local/pdf/resource-guides/7100059-en.pdf.

•Productwarranties—Forproductwarrantyinformation,visithttps://www.juniper.net/support/warranty/.

•JTAC hours of operation—The JTAC centers have resources available 24 hours a day, 7 days a week, 365 days a year.

Self-HelpOnlineToolsandResources

Forquickandeasyproblemresolution,JuniperNetworkshasdesignedanonlineself-serviceportalcalled the Customer Support Center (CSC) that provides you with the following features:

•Find CSC offerings: https://www.juniper.net/customers/support/

•Search for known bugs: https://prsearch.juniper.net/

•Find product documentation: https://www.juniper.net/documentation/

•Find solutions and answer questions using our Knowledge Base: https://kb.juniper.net/

•Download the latest versions of software and review release notes: https://www.juniper.net/customers/csc/software/

•Search technical bulletins for relevant hardware and software notifications: https://kb.juniper.net/InfoCenter/

•Join and participate in the Juniper Networks Community Forum: https://www.juniper.net/company/communities/

•Create a service request online: https://myjuniper.juniper.net

To verify service entitlement by product serial number, use our Serial Number Entitlement (SNE) Tool: https://entitlementsearch.juniper.net/entitlementsearch/

CreatingaServiceRequestwithJTAC

You can create a service request with JTAC on the Web or by telephone.

•Visit https://myjuniper.juniper.net.

•Call 1-888-314-JTAC (1-888-314-5822 toll-free in the USA, Canada, and Mexico).

For international or direct-dial options in countries without toll-free numbers, see https://support.juniper.net/support/requesting-support/.

CHAPTER

Overview

EX9251 System Overview | 19

EX9251 Chassis | 26

EX9251 Cooling System | 33

EX9251 Power System | 36

EX9251SystemOverview

INTHISSECTION

EX9251 Switch Hardware Overview | 19

EX9251 Switch Models | 24

EX9251 Switch Hardware and CLI Terminology Mapping | 24

EX9251SwitchHardwareOverview

INTHISSECTION

Software | 20

Benefits of the EX9251 Switch | 20

EX9251 Switch Models | 20

Front Panel of an EX9251 Switch | 20

Rear Panel of an EX9251 Switch | 22

Routing Engine | 22

Power Supplies | 23

Cooling System | 23

Component Redundancy | 23

Juniper Networks EX9251 Ethernet Switch is an Ethernet-optimized switch that provides carrier-class Ethernetswitching. Itisafixedconfigurationswitchwithabuilt-inRoutingEngine. Ithasathroughputof up to 400 gigabits per second (Gbps).

The switch has eight 10-Gigabit Ethernet ports and four rate-selectable ports that you can configure as 100-Gigabit Ethernet ports or 40-Gigabit Ethernet ports; each rate-selectable port can be configured as four 10-Gigabit Ethernet ports by using a breakout cable. The 10-Gigabit Ethernet ports support SFP+ transceiversandrate-selectableportssupportQSFP28andQSFP+transceivers. Theswitchsupportstwo power supplies and three fan trays.

Software

JuniperNetworksEXSeriesEthernetSwitchesrunJunosOS,whichprovidesLayer2andLayer3switching, routing,andsecurityservices. ThesameJunosOScodebasethatrunsonEXSeriesswitchesalsorunson all Juniper Networks M Series, MX Series, and T Series routers, and SRX Series Services Gateways.

BenefitsoftheEX9251Switch

Simplifiednetworkarchitecture—EX9251switchesdeliverasimple,secure,virtualizednetworkenvironment that increases business agility. They are ideal for simplifying campus, data center, and combined campus and data center network environments by collapsing network layers.

Support for Junos Fusion Enterprise—EX9251 switches support Junos Fusion Enterprise technology that enablesalargenumberofdevicesdeployedthroughoutabuildingtobemanagedasasingle,logicaldevice, thus reducing network complexity, simplifying network management, and lowering operational costs.

EX9251SwitchModels

EX9251switchisavailableintwomodels—withACpowersupplyandwithDCpowersupply.See“EX9251 Switch Models” on page 24.

FrontPanelofanEX9251Switch

Figure 1 on page 21 shows the front panel of an EX9251 switch.

Figure1:FrontPanelofanEX9251Switch

	1	2	3	4	5	6		7	8
									<![if ! IE]> <![endif]>g022400
16	15		14	13		12	11	10	9
1—Rate-selectable ports—These ports can operate in					9—Reset button—button to reset the switch.
100G,40G,and10Gspeedsandsupporttransceivers
and direct attach copper (DAC) cables.

2—Management Ethernet port—This port connects the switchtoamanagementdevice(oranyotherdevice that plugs into an Ethernet connection) for out-of-band management through an Ethernet connection. The port uses an autosensing RJ-45 connector to support 10-Mbps, 100-Mbps, or 1000-Mbps connections.

10—SSD0 LED—indicates the status of the solid-state drive labeled SSD0.

3—BITS ports with LEDs—Building-integrated timing supply (BITS) external clocking port, that connects the switch to external clocking devices.

11—Alarm LED—indicates alarms.

4—USBport—USBport,thatprovidesaremovablemedia 12—OK/Fail LED—indicates the status of the switch. interface that you can use to install Junos OS

manually. Junos OS supports USB version 1.0 and later.

5—1PPS and 10 MHz GPS input and output timing ports—1-pulse-per-second (PPS) connectors and 10-MHz timing connectors respectively (one input andoneoutput),thatconnectstheswitchtoexternal clock signal sources. The clocking ports provide the synchronized output clocks from any one of the reference clock inputs based on the clock’s priority.

13—Time of day (ToD) port with LED—ToD port, that connectstheswitchtoexternaltimingsignalsources.

6—Online LED—indicates the status of the switch and the operating system.

14—Consoleport—Consoleport,thatconnectstheswitch to a system console through a serial cable with an RJ-45 connector.

7—SSD1 LED—indicates the status of the solid-state drive labeled SSD1.

8—Offline button—button to turn the switch online or offline or to power on or power off the switch.

15—10-Gigabit Ethernet SFP+ ports—support SFP+ transceivers and direct attach copper (DAC) cables.

16—PTP grandmaster clock (GM/PTP) port—PTP grandmaster clock port, that connects the switch to a timing device. Support for this port is not available in this release.

RearPanelofanEX9251Switch

Figure2onpage22showstherearpanelofanEX9251switchwithACpowersupply.Figure3onpage22 shows the rear panel of an EX9251 switch with DC power supply.

Figure2:RearPanelofanEX9251SwitchwithACPowerSupply

<![if ! IE]>

<![endif]>g022401

5	4
1—Protective earthing terminal	4—Fan tray LEDs
2—Electrostatic discharge (ESD) point	5—AC power supply units
3—Fan trays

Figure3:RearPanelofanEX9251SwitchwithDCPowerSupply

<![if ! IE]>

<![endif]>g022042

1	2
1—Fan trays	2—DC power supply units

RoutingEngine

EX9251 switches have a single built-in Routing Engine. It provides switching protocol processes and softwareprocessesthatcontroltheswitch’sinterface,thechassiscomponents,systemmanagement,and useraccesstotheswitch. TheseswitchingprocessesrunontopofakernelthatinteractswiththePacket Forwarding Engine. The Routing Engine is built-in on the baseboard and cannot be replaced.

It supports the following functionalities to manage the operation of the switch:

•System control functions such as environmental monitoring

•Routing Layer 2 and Layer 3 protocols

•Communication to components such as power supplies and fan trays

•Transparent clocking

•Alarm and logging functions

It consists of the following internal components:

•High-performance 1.6-GHz Intel 8 Core X86 CPU

•32-GB DDR4 RAM

•2x100-GB SATA SSD

PowerSupplies

EX9251 switches support AC power supply and DC power supply. See “Power Supplies in an EX9251 Switch” on page 36.

CAUTION: Do not mix AC and DC power supplies in the same chassis.

CoolingSystem

ThecoolingsysteminanEX9251switchconsistsofthreefantrays. Thefantraysareinstalledontherear panel of the chassis. Each fan tray contains one counter rotating fan. See “EX9251 Cooling System” on page 33.

ComponentRedundancy

A fully configured EX9251 switch is designed such that no single point of failure can cause the entire system to fail. The following major hardware components are redundant:

•Powersupplies—Theswitchsupportstwopowersupplies. Ifonepowersupplyfailsinafullyconfigured switch, the other power supply can provide full power to the switch.

•Cooling system—The switch supports three fan trays. If one fan fails or the temperature of the chassis rises above the temperature threshold in a fully configured switch, the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable range.

CAUTION: In a fully configured switch, all the three fan trays and the two power supplies must be operational. In the event of any failure, the failed component must be replaced immediately.

EX9251SwitchModels

EX9251isavailableintwomodels—withACpowersupplyandwithDCpowersupply. Table3onpage24 lists the models and the components included in each model.

Table3:EX9251SwitchModels
		First Junos OS
Switch Models	Configuration Components	Release
EX9251-8X4C	• Chassis	18.1R1
	• Three fan trays
	• Two AC power supplies
EX9251-8X4C-DC	• Chassis	18.1R1
	• Three fan trays
	• Two DC power supplies

EX9251SwitchHardwareandCLITerminologyMapping

This topic describes the hardware terms used in EX9251 switch documentation and the corresponding terms used in the Junos OS CLI. See Table 4 on page 24.

Table4:CLIEquivalentsofTermsUsedinDocumentationforEX9251Switches

Hardware			Item in	Additional
Item (CLI)	Description (CLI)	Value (CLI)	Documentation	Information
Chassis	EX9251	–	Switch chassis	“Chassis Physical
				Specifications of an
				EX9251 Switch” on
				page 26
Routing	EX9251-RE	0	Routing Engine	“EX9251 Switch
Engine				HardwareOverview”on
				page 19
CB	EX9251	0	Routing Engine	“EX9251 Switch
				HardwareOverview”on
				page 19

FPC

–

Table4:CLIEquivalentsofTermsUsedinDocumentationforEX9251Switches (continued)

Hardware			Item in	Additional
Item (CLI)	Description (CLI)	Value (CLI)	Documentation	Information
PIC (n)	Abbreviatednameof	n is a value in the range	–	–
	the Physical	0-1. The value
	Interface Card (PIC).	corresponds to the PIC
	Oneofthefollowing:	slot number.
	• 4XQSFP28 PIC
	• 8XSFPP PIC
Xcvr (n)	Abbreviatednameof	n is a value equivalent to	Optical transceivers	HardwareCompatibility
	the transceiver.	thenumberoftheportin		Tool page for EX9251
		which the transceiver is
		installed.

PEM (n) Oneofthefollowing:

•AC AFO 650W PSU

•JPSU-650W-DC-AFO

n is a value in the range	AC or DC power
0-1. The value	supply
correspondstothepower
supply slot number.

“Power Supplies in an EX9251 Switch” on page 36

Fan tray (n)	Fan Tray, Front to	n is a value in the range	Fan tray	“EX9251 Cooling
	Back Airflow - AFO	0-2. The value		System” on page 33
		corresponds to the fan
		tray slot number.

Table 5 on page 25 lists the spare parts and blank panels available for the switch. They must be ordered separately.

Table5:SparePartsandBlankPanels
Model Number	Description
EX9251-CHAS	EX9251 chassis, spare
JNP-PWR-BLNK-1	EX9251 power supply slot blank panel

EX9251Chassis

INTHISSECTION

Chassis Physical Specifications of an EX9251 Switch | 26

Field-Replaceable Units in an EX9251 Switch | 27

LEDs on the Front Panel of an EX9251 Switch | 27

ChassisPhysicalSpecificationsofanEX9251Switch

The EX9251 switch chassis is a rigid sheet-metal structure that houses all components of the switch. EX9251isavailableintwovariants—withACpowersupplyandwithDCpowersupply.Table6onpage26 summarizes the physical specifications of the EX9251 switch chassis.

Table6:PhysicalSpecificationsoftheEX9251SwitchChassis

Description	Weight	Width	Depth	Height
Chassis	22.7 lb (10.3 kg)	19 in. (48.26 cm)	• 18.5 in. (47 cm)	1.72 in. (4.37 cm)
			• 20.43 in.
			(51.89 cm) with
			fan tray and
			power supply
			handles
Fan tray	0.29 lb (0.13 kg)	1.89 in. (4.8 cm)	5.78 in. (14.68 cm)	1.64 in. (4.17 cm)
AC power supply	2.2 lb (1 kg)	2.23 in. (5.66 cm)	14.5 in. (36.83 cm)	1.58 in. (4.01 cm)
DC power supply	2.2 lb (1 kg)	2.23 in. (5.66 cm)	14.53 in. (36.91 cm)	1.67 in. (4.24 cm)

You can mount an EX9251 switch on four posts of a 19-in. rack or an ETSI rack.

Field-ReplaceableUnitsinanEX9251Switch

Field-replaceable units (FRUs) are components that you can replace at your site. The FRUs in EX9251 switches are hot-removable and hot-insertable. You can remove and replace them without powering off the switch. The FRUs in EX9251 switches are:

•Power supplies

•Fan trays

•Transceivers

NOTE: If you have a Juniper J-Care service contract, register any addition, change, or upgrade of hardware components at https://www.juniper.net/customers/support/tools/updateinstallbase/ . Failure to do so can resultinsignificantdelaysifyouneedreplacementparts.Thisnotedoesnotapplyifyoureplace existing components with the same type of component.

To install an AC power supply in an EX9251 switch, follow instructions in “Installing an AC Power Supply in an EX9251 Switch” on page 128. To remove an AC power supply from an EX9251 switch, follow instructions in “Removing an AC Power Supply from an EX9251 Switch” on page 126.

To install a DC power supply in an EX9251 switch, follow instructions in “Installing a DC Power Supply in anEX9251Switch”onpage131.ToremoveaDCpowersupplyfromanEX9251switch,followinstructions in “Removing a DC Power Supply from an EX9251 Switch” on page 129.

ToinstallafantrayinanEX9251switch,followinstructionsin“InstallingaFanTrayinanEX9251Switch” on page 122. To remove a fan tray from an EX9251 switch, follow instructions in “Removing a Fan Tray from an EX9251 Switch” on page 121.

To install a transceiver in an EX9251 switch, follow instructions in “Install a Transceiver” on page 108 or “Install a QSFP28 Transceiver” on page 142. To remove a transceiver from an EX9251 switch, follow instructions in “Remove a Transceiver” on page 135 or “Remove a QSFP28 Transceiver” on page 140.

LEDsontheFrontPanelofanEX9251Switch

Thefourrate-selectableportsonthefrontpanelofanEX9251switchhasfourLEDseach,whichindicate the link status and activity on the port. Figure 4 on page 28 shows the LEDs on the rate-selectable ports. Table 7 on page 28 describes the link activity LED on those ports.

Figure4:LEDsontheRate-selectablePorts

1 2 3 4

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1—LED0	3—LED2
2—LED1	4—LED3

Table7:Link/ActivityLEDontheRate-SelectablePorts
		Port Speed
LED	Color/State	100G	40G	10G
LED 0	Green	A 100G module is plugged	A40Gmoduleispluggedin,	A10Gmoduleispluggedin,
		in, the port link is up, and	theportlinkisup,andthere	theportlinkisup,andthere
		thereisnoalarmorfailure.	is no alarm or failure.	is no alarm or failure.
	Red	The port link is down.	The port link is down.	The port link is down.
	Amber	The interface is	The interface is	The interface is
		administratively disabled.	administratively disabled.	administratively disabled.
	Off	No 100G module is	No 40G module is plugged	No 10G module is plugged
		plugged in.	in.	in.
LED 1	Green	Not applicable	Not applicable	A10Gmoduleispluggedin,
				theportlinkisup,andthere
				is no alarm or failure.
	Red	Not applicable	Not applicable	The port link is down.
	Amber	Not applicable	Not applicable	The interface is
				administratively disabled.
	Off	Not applicable	Not applicable	No 10G module is plugged
				in.

Table7:Link/ActivityLEDontheRate-SelectablePorts (continued)
		Port Speed
LED	Color/State	100G	40G	10G
LED 2	Green	Not applicable	Not applicable	A10Gmoduleispluggedin,
				theportlinkisup,andthere
				is no alarm or failure.
	Red	Not applicable	Not applicable	The port link is down.
	Amber	Not applicable	Not applicable	The interface is
				administratively disabled.
	Off	Not applicable	Not applicable	No 10G module is plugged
				in.
LED 3	Green	Not applicable	Not applicable	A10Gmoduleispluggedin,
				theportlinkisup,andthere
				is no alarm or failure.
	Red	Not applicable	Not applicable	The port link is down.
	Amber	Not applicable	Not applicable	The interface is
				administratively disabled.
	Off	Not applicable	Not applicable	No 10G module is plugged
				in.

Theeight10-GigabitEthernetSFP+portsonthefrontpanelofanEX9251switchhasoneLEDeach,which indicate the link status and activity on the port. Figure 5 on page 30 shows the LEDs on the SFP+ ports labeled 1/0, 1/2, 1/4, and 1/6. Figure 5 on page 30 shows the LEDs on the SFP+ ports labeled 1/1, 1/3, 1/5, and 1/7. Table 8 on page 30 describes those LEDs.

Figure5:LEDsontheSFP+PortsLabeled1/0,1/2,1/4,and1/6

1 2

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1—LED on the port labeled 1/0		3—LED on the port labeled 1/4
2—LED on the port labeled 1/2		4—LED on the port labeled 1/6

Figure6:LEDsontheSFP+PortsLabeled1/1,1/3,1/5,and1/7

1 2 3 4

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1—LED on the port labeled 1/1		3—LED on the port labeled 1/5
2—LED on the port labeled 1/3		4—LED on the port labeled 1/7

Table8:Link/ActivityLEDonthe10-GigabitEthernetSFP+Ports

LED	Color/State	State and Description
Link activity	Green	The port link is up and there is no alarm or failure.
	Red	The port link is down.
	Off	The port is not enabled.

Figure 7 on page 31 shows the LEDs on the management port and Figure 8 on page 31 shows the LEDs on the BITS port. Table 9 on page 31 describes the functions of the LEDs on the other ports on the front panel.

+ 196 hidden pages

Juniper EX9251 User Manual

Table of Contents

Documentation and Release Notes | xi

Using the Examples in This Manual | xi

Overview

EX9251 Switch Hardware Overview | 19

Software

Chassis Physical Specifications of an EX9251 Switch | 26