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
Juniper Networks, the Juniper Networks logo, Juniper, and Junos are registered trademarks of Juniper Networks, Inc. in
the United States and other countries. All other trademarks, service marks, registered marks, or registered service marks
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.
EX9251 Switch Hardware Guide
Copyright © 2021 Juniper Networks, Inc. All rights reserved.
The information in this document is current as of the date on the title page.
ii
YEAR 2000 NOTICE
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.
END USER LICENSE AGREEMENT
The Juniper Networks product that is the subject of this technical documentation consists of (or is intended for use with)
Juniper Networks software. Use of such software is subject to the terms and conditions of the End User License Agreement
(“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.
Table of Contents
1
About the Documentation | 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
iii
Overview
EX9251 System Overview | 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
EX9251 Chassis | 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
2
EX9251 Cooling System | 33
Fan Trays | 33
Airflow Direction in the EX9251 Switch Chassis | 34
Cooling System in the Power Supplies | 35
Fan Tray Status LEDs | 35
EX9251 Power System | 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
iv
Power Requirements for EX9251 Switch Components | 44
Power Requirements for EX9251 Switch Components | 44
Calculating System Thermal Output | 45
Power Supply Specifications for EX9251 Switches | 45
Site Planning, Preparation, and Specifications
Site Preparation Checklist for an EX9251 Switch | 48
EX9251 Site Guidelines and Requirements | 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
EX9251 Network Cable and Transceiver Planning | 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
EX9251 Management Cable Specifications and Pinouts | 68
Management Cable Specifications | 69
Specifications of Cables and Wires That Connect to Ports on the Front Panel in an EX9251
Switch | 69
v
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
Initial Installation and Configuration
3
Unpacking and Mounting the EX9251 Switch | 76
Unpacking an EX9251 Switch | 76
Parts Inventory (Packing List) for an EX9251 Switch | 77
Register Products—Mandatory to Validate SLAs | 79
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
Connecting the EX9251 to Power | 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
vi
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
Connecting the EX9251 to External Devices | 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
Connecting the EX9251 to the Network | 108
Install a Transceiver | 108
Connect a Fiber-Optic Cable | 111
Configuring Junos OS on the EX9251 | 112
EX9251 Switch Default Configuration | 112
Connecting and Configuring an EX9251 Switch (CLI Procedure) | 113
Maintaining Components
4
5
Routine Maintenance Procedures for EX9251 Switches | 119
Routine Maintenance Procedures for EX9251 Switches | 119
Maintaining the Routing Engine in EX9251 Switches | 119
Maintaining the EX9251 Cooling System | 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
Maintaining the EX9251 Power System | 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
vii
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
Maintaining Transceivers | 134
Remove a Transceiver | 135
Install a Transceiver | 138
Remove a QSFP28 Transceiver | 140
Install a QSFP28 Transceiver | 142
Maintain Fiber-Optic Cables | 144
Connect a Fiber-Optic Cable | 144
Disconnect a Fiber-Optic Cable | 145
How to Handle Fiber-Optic Cables | 146
Troubleshooting Hardware
Troubleshooting EX9251 Components | 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
Contacting Customer Support and Returning the Chassis or Components
6
7
Returning an EX9251 Chassis or Components | 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
Safety and Compliance Information
General Safety Guidelines and Warnings | 167
viii
Definitions of Safety Warning Levels | 168
Qualified Personnel Warning | 171
Warning Statement for Norway and Sweden | 172
Fire Safety Requirements | 172
Fire Suppression | 172
Fire Suppression Equipment | 172
Installation Instructions Warning | 174
Chassis and Component Lifting Guidelines | 174
Restricted Access Warning | 176
Ramp Warning | 178
Rack-Mounting and Cabinet-Mounting Warnings | 179
Grounded Equipment Warning | 185
Radiation from Open Port Apertures Warning | 186
Laser and LED Safety Guidelines and Warnings | 187
General Laser Safety Guidelines | 187
Class 1 Laser Product Warning | 188
Class 1 LED Product Warning | 189
Laser Beam Warning | 190
Maintenance and Operational Safety Guidelines and Warnings | 190
Battery Handling Warning | 192
Jewelry Removal Warning | 193
Lightning Activity Warning | 195
Operating Temperature Warning | 196
Product Disposal Warning | 198
General Electrical Safety Guidelines and Warnings | 199
Action to Take After an Electrical Accident | 200
Prevention of Electrostatic Discharge Damage | 201
AC Power Electrical Safety Guidelines | 202
ix
AC Power Disconnection Warning | 204
DC Power Electrical Safety Guidelines | 205
DC Power Disconnection Warning | 206
DC Power Grounding Requirements and Warning | 208
DC Power Wiring Sequence Warning | 210
DC Power Wiring Terminations Warning | 213
Multiple Power Supplies Disconnection Warning | 216
TN Power Warning | 217
Agency Approvals for EX9251 Switches | 217
Compliance Statements for EMC Requirements for EX Series Switches | 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
Compliance Statements for Acoustic Noise for EX Series Switches | 223
Statements of Volatility for Juniper Network Devices | 224
x
About the Documentation
IN THIS SECTION
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
troubleshooting for the EX9251 switch. After completing the installation and basic configuration procedures
covered in this guide, refer to the Junos OS documentation for information about further software
configuration.
xi
Documentation and Release Notes
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/.
If the information in the latest release notes differs from the information in the documentation, follow the
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.
Using the Examples in This Manual
If you want to use the examples in this manual, you can use the load merge or the load merge relative
command. These commands cause the software to merge the incoming configuration into the current
candidate configuration. The example does not become active until you commit the candidate configuration.
If the example configuration contains the top level of the hierarchy (or multiple hierarchies), the example
is a full example. In this case, use the load merge command.
If the example configuration does not start at the top level of the hierarchy, the example is a snippet. In
this case, use the load merge relative command. These procedures are described in the following sections.
Merging a Full Example
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;
}
}
}
}
xii
2. Merge the contents of the file into your routing platform configuration by issuing the load merge
configuration mode command:
[edit]
user@host# load merge /var/tmp/ex-script.conf
load complete
Merging a Snippet
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. Move to the hierarchy level that is relevant for this snippet by issuing the following configuration mode
command:
[edit]
user@host# edit system scripts
[edit system scripts]
xiii
3. Merge the contents of the file into your routing platform configuration by issuing the load merge
relative configuration mode command:
[edit system scripts]
user@host# load merge relative /var/tmp/ex-script-snippet.conf
load complete
For more information about the load command, see CLI Explorer.
Documentation Conventions
Table 1 on page xiv defines notice icons used in this guide.
Table 1: Notice Icons
xiv
DescriptionMeaningIcon
Indicates important features or instructions.Informational note
Caution
Indicates a situation that might result in loss of data or hardware
damage.
Alerts you to the risk of personal injury or death.Warning
Alerts you to the risk of personal injury from a laser.Laser warning
Indicates helpful information.Tip
Alerts you to a recommended use or implementation.Best practice
Table 2 on page xiv defines the text and syntax conventions used in this guide.
Table 2: Text and Syntax Conventions
ExamplesDescriptionConvention
Fixed-width text like this
Italic text like this
Represents text that you type.Bold text like this
Represents output that appears on
the terminal screen.
Introduces or emphasizes important
•
new terms.
Identifies guide names.
•
Identifies RFC and Internet draft
•
titles.
To enter configuration mode, type
the configure command:
user@host> configure
user@host> show chassis alarms
No alarms currently active
A policy term is a named structure
•
that defines match conditions and
actions.
Junos OS CLI User Guide
•
RFC 1997, BGP Communities
•
Attribute
Table 2: Text and Syntax Conventions (continued)
xv
ExamplesDescriptionConvention
Italic text like this
Text like this
< > (angle brackets)
| (pipe symbol)
Represents variables (options for
which you substitute a value) in
commands or configuration
statements.
Represents names of configuration
statements, commands, files, and
directories; configuration hierarchy
levels; or labels on routing platform
components.
variables.
Indicates a choice between the
mutually exclusive keywords or
variables on either side of the symbol.
The set of choices is often enclosed
in parentheses for clarity.
Configure the machine’s domain
name:
[edit]
root@# set system domain-name
domain-name
To configure a stub area, include
•
the stub statement at the [edit
protocols ospf area area-id]
hierarchy level.
The console port is labeled
•
CONSOLE.
stub <default-metric metric>;Encloses optional keywords or
broadcast | multicast
(string1 | string2 | string3)
# (pound sign)
[ ] (square brackets)
Indention and braces ( { } )
; (semicolon)
GUI Conventions
Indicates a comment specified on the
same line as the configuration
statement to which it applies.
Encloses a variable for which you can
substitute one or more values.
Identifies a level in the configuration
hierarchy.
Identifies a leaf statement at a
configuration hierarchy level.
rsvp { # Required for dynamic MPLS
only
community name members [
community-ids ]
[edit]
routing-options {
static {
route default {
nexthop address;
retain;
}
}
}
Table 2: Text and Syntax Conventions (continued)
xvi
ExamplesDescriptionConvention
Bold text like this
> (bold right angle bracket)
Represents graphical user interface
(GUI) items you click or select.
Separates levels in a hierarchy of
menu selections.
In the Logical Interfaces box, select
•
All Interfaces.
To cancel the configuration, click
•
Cancel.
In the configuration editor hierarchy,
select Protocols>Ospf.
Documentation Feedback
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—Send your comments to techpubs-comments@juniper.net. Include the document or topic name,
•
URL or page number, and software version (if applicable).
Requesting Technical Support
Technical product support is available through the Juniper Networks Technical Assistance Center (JTAC).
If you are a customer with an active Juniper Care or Partner Support Services support contract, or are
covered under warranty, and need post-sales technical support, you can access our tools and resources
online or open a case with JTAC.
JTAC policies—For a complete understanding of our JTAC procedures and policies, review the JTAC User
•
Guide located at https://www.juniper.net/us/en/local/pdf/resource-guides/7100059-en.pdf.
Product warranties—For product warranty information, visit https://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-Help Online Tools and Resources
For quick and easy problem resolution, Juniper Networks has designed an online self-service portal called
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/
•
xvii
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/
Creating a Service Request with JTAC
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/.
1
CHAPTER
Overview
EX9251 System Overview | 19
EX9251 Chassis | 26
EX9251 Cooling System | 33
EX9251 Power System | 36
EX9251 System Overview
IN THIS SECTION
EX9251 Switch Hardware Overview | 19
EX9251 Switch Models | 24
EX9251 Switch Hardware and CLI Terminology Mapping | 24
EX9251 Switch Hardware Overview
19
IN THIS SECTION
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
Ethernet switching. It is a fixed configuration switch with a built-in Routing Engine. It has a throughput of
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+
transceivers and rate-selectable ports support QSFP28 and QSFP+ transceivers. The switch supports two
power supplies and three fan trays.
Software
Juniper Networks EX Series Ethernet Switches run Junos OS, which provides Layer 2 and Layer 3 switching,
routing, and security services. The same Junos OS code base that runs on EX Series switches also runs on
all Juniper Networks M Series, MX Series, and T Series routers, and SRX Series Services Gateways.
Benefits of the EX9251 Switch
Simplified network architecture—EX9251 switches deliver a simple, secure, virtualized network environment
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
enables a large number of devices deployed throughout a building to be managed as a single, logical device,
thus reducing network complexity, simplifying network management, and lowering operational costs.
EX9251 Switch Models
20
EX9251 switch is available in two models—with AC power supply and with DC power supply. See “EX9251
Switch Models” on page 24.
Front Panel of an EX9251 Switch
Figure 1 on page 21 shows the front panel of an EX9251 switch.
Figure 1: Front Panel of an EX9251 Switch
g022400
15
8
1016
732 4 6
9
1 5
1314 1112
100G, 40G, and 10G speeds and support transceivers
and direct attach copper (DAC) cables.
21
9—1— Reset button—button to reset the switch.Rate-selectable ports—These ports can operate in
Management Ethernet port—This port connects the
switch to a management device (or any other device
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.
supply (BITS) external clocking port, that connects
the switch to external clocking devices.
interface that you can use to install Junos OS
manually. Junos OS supports USB version 1.0 and
later.
1PPS and 10 MHz GPS input and output timing
ports—1-pulse-per-second (PPS) connectors and
10-MHz timing connectors respectively (one input
and one output), that connects the switch to external
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.
10—2— SSD0 LED—indicates the status of the solid-state
drive labeled SSD0.
11—3— Alarm LED—indicates alarms.BITS ports with LEDs—Building-integrated timing
12—4— OK/Fail LED—indicates the status of the switch.USB port—USB port, that provides a removable media
13—5— Time of day (ToD) port with LED—ToD port, that
connects the switch to external timing signal sources.
Online LED—indicates the status of the switch and
the operating system.
SSD1 LED—indicates the status of the solid-state
drive labeled SSD1.
Offline button—button to turn the switch online or
offline or to power on or power off the switch.
14—6— Console port—Console port, that connects the switch
to a system console through a serial cable with an
RJ-45 connector.
15—7— 10-Gigabit Ethernet SFP+ ports—support SFP+
transceivers and direct attach copper (DAC) cables.
16—8— 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.
Rear Panel of an EX9251 Switch
g022401
3
1
4
2
5
g022042
1 2
Figure 2 on page 22 shows the rear panel of an EX9251 switch with AC power supply. Figure 3 on page 22
shows the rear panel of an EX9251 switch with DC power supply.
Figure 2: Rear Panel of an EX9251 Switch with AC Power Supply
4—1— Fan tray LEDsProtective earthing terminal
5—2— AC power supply unitsElectrostatic discharge (ESD) point
3—Fan trays
22
Figure 3: Rear Panel of an EX9251 Switch with DC Power Supply
2—1— DC power supply unitsFan trays
Routing Engine
EX9251 switches have a single built-in Routing Engine. It provides switching protocol processes and
software processes that control the switch’s interface, the chassis components, system management, and
user access to the switch. These switching processes run on top of a kernel that interacts with the Packet
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
•
Power Supplies
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.
23
Cooling System
The cooling system in an EX9251 switch consists of three fan trays. The fan trays are installed on the rear
panel of the chassis. Each fan tray contains one counter rotating fan. See “EX9251 Cooling System” on
page 33.
Component Redundancy
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:
Power supplies—The switch supports two power supplies. If one power supply fails in a fully configured
•
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.
EX9251 Switch Models
EX9251 is available in two models—with AC power supply and with DC power supply. Table 3 on page 24
lists the models and the components included in each model.
Table 3: EX9251 Switch Models
First Junos OS
ReleaseConfiguration ComponentsSwitch Models
24
EX9251-8X4C
EX9251-8X4C-DC
Chassis
•
Three fan trays
•
Two AC power supplies
•
Chassis
•
Three fan trays
•
Two DC power supplies
•
18.1R1
18.1R1
EX9251 Switch Hardware and CLI Terminology Mapping
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.
Table 4: CLI Equivalents of Terms Used in Documentation for EX9251 Switches
Hardware
Item (CLI)
Item in
DocumentationValue (CLI)Description (CLI)
Additional
Information
Engine
Switch chassis–EX9251Chassis
Routing Engine0EX9251-RERouting
Routing Engine0EX9251CB
“Chassis Physical
Specifications of an
EX9251 Switch” on
page 26
“EX9251 Switch
Hardware Overview” on
page 19
“EX9251 Switch
Hardware Overview” on
page 19
––0FPCFPC
Table 4: CLI Equivalents of Terms Used in Documentation for EX9251 Switches (continued)
25
Hardware
Item (CLI)
PIC (n)
Xcvr (n)
PEM (n)
Abbreviated name of
the Physical
Interface Card (PIC).
One of the following:
4XQSFP28 PIC
•
8XSFPP PIC
•
Abbreviated name of
the transceiver.
One of the following:
AC AFO 650W
•
PSU
JPSU-650W-DC-AFO
•
0-1. The value
corresponds to the PIC
slot number.
the number of the port in
which the transceiver is
installed.
n is a value in the range
0-1. The value
corresponds to the power
supply slot number.
Item in
DocumentationValue (CLI)Description (CLI)
Optical transceiversn is a value equivalent to
AC or DC power
supply
Additional
Information
––n is a value in the range
Hardware Compatibility
Tool page for EX9251
“Power Supplies in an
EX9251 Switch” on
page 36
Fan tray (n)
Fan Tray, Front to
Back Airflow - AFO
Fan trayn is a value in the range
0-2. The value
corresponds to the fan
tray slot number.
“EX9251 Cooling
System” on page 33
Table 5 on page 25 lists the spare parts and blank panels available for the switch. They must be ordered
separately.
Table 5: Spare Parts and Blank Panels
DescriptionModel Number
EX9251 chassis, spareEX9251-CHAS
EX9251 power supply slot blank panelJNP-PWR-BLNK-1
EX9251 Chassis
IN THIS SECTION
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
Chassis Physical Specifications of an EX9251 Switch
The EX9251 switch chassis is a rigid sheet-metal structure that houses all components of the switch.
EX9251 is available in two variants—with AC power supply and with DC power supply. Table 6 on page 26
summarizes the physical specifications of the EX9251 switch chassis.
26
Table 6: Physical Specifications of the EX9251 Switch Chassis
19 in. (48.26 cm)22.7 lb (10.3 kg)Chassis
18.5 in. (47 cm)
•
20.43 in.
•
(51.89 cm) with
fan tray and
power supply
handles
You can mount an EX9251 switch on four posts of a 19-in. rack or an ETSI rack.
HeightDepthWidthWeightDescription
1.72 in. (4.37 cm)
1.64 in. (4.17 cm)5.78 in. (14.68 cm)1.89 in. (4.8 cm)0.29 lb (0.13 kg)Fan tray
1.58 in. (4.01 cm)14.5 in. (36.83 cm)2.23 in. (5.66 cm)2.2 lb (1 kg)AC power supply
1.67 in. (4.24 cm)14.53 in. (36.91 cm)2.23 in. (5.66 cm)2.2 lb (1 kg)DC power supply
Field-Replaceable Units in an EX9251 Switch
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
result in significant delays if you need replacement parts. This note does not apply if you replace
existing components with the same type of component.
27
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
an EX9251 Switch” on page 131. To remove a DC power supply from an EX9251 switch, follow instructions
in “Removing a DC Power Supply from an EX9251 Switch” on page 129.
To install a fan tray in an EX9251 switch, follow instructions in “Installing a Fan Tray in an EX9251 Switch”
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.
LEDs on the Front Panel of an EX9251 Switch
The four rate-selectable ports on the front panel of an EX9251 switch has four LEDs each, which indicate
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.
Figure 4: LEDs on the Rate-selectable Ports
g022446
1 2 3 4
3—1— LED2LED0
4—2— LED3LED1
Table 7: Link/Activity LED on the Rate-Selectable Ports
Port Speed
28
Color/StateLED 10G40G100G
GreenLED 0
Amber
Off
A 100G module is plugged
in, the port link is up, and
there is no alarm or failure.
The interface is
administratively disabled.
No 100G module is
plugged in.
A 40G module is plugged in,
the port link is up, and there
is no alarm or failure.
The interface is
administratively disabled.
No 40G module is plugged
in.
Not applicableNot applicableGreenLED 1
Not applicableNot applicableAmber
A 10G module is plugged in,
the port link is up, and there
is no alarm or failure.
The port link is down.The port link is down.The port link is down.Red
The interface is
administratively disabled.
No 10G module is plugged
in.
A 10G module is plugged in,
the port link is up, and there
is no alarm or failure.
The port link is down.Not applicableNot applicableRed
The interface is
administratively disabled.
Not applicableNot applicableOff
No 10G module is plugged
in.
Table 7: Link/Activity LED on the Rate-Selectable Ports (continued)
Port Speed
Color/StateLED 10G40G100G
29
Not applicableNot applicableGreenLED 2
Not applicableNot applicableAmber
Not applicableNot applicableOff
Not applicableNot applicableGreenLED 3
Not applicableNot applicableAmber
A 10G module is plugged in,
the port link is up, and there
is no alarm or failure.
The port link is down.Not applicableNot applicableRed
The interface is
administratively disabled.
No 10G module is plugged
in.
A 10G module is plugged in,
the port link is up, and there
is no alarm or failure.
The port link is down.Not applicableNot applicableRed
The interface is
administratively disabled.
Not applicableNot applicableOff
No 10G module is plugged
in.
The eight 10-Gigabit Ethernet SFP+ ports on the front panel of an EX9251 switch has one LED each, 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.
Figure 5: LEDs on the SFP+ Ports Labeled 1/0, 1/2, 1/4, and 1/6
g022447
1 2
3
4
g022448
1 2 3
4
3—1— LED on the port labeled 1/4LED on the port labeled 1/0
4—2— LED on the port labeled 1/6LED on the port labeled 1/2
Figure 6: LEDs on the SFP+ Ports Labeled 1/1, 1/3, 1/5, and 1/7
30
3—1— LED on the port labeled 1/5LED on the port labeled 1/1
4—2— LED on the port labeled 1/7LED on the port labeled 1/3
Table 8: Link/Activity LED on the 10-Gigabit Ethernet SFP+ Ports
State and DescriptionColor/StateLED
The port link is up and there is no alarm or failure.GreenLink activity
The port link is down.Red
The port is not enabled.Off
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.
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