Arista DCS-7304 User manual

Quick Start Guide
7300 Series Modular
Data Center Switches
DCS-7304
DCS-7308
DCS-7316
DCS-7324
DCS-7328
Arista Networks
www.arista.com
PDOC-00040-10

ii Quick Start Guide: 7300 Series Modular Data Center Switches
© Copyright 2017 Arista Networks, Inc. The information contained herein is subject to change without notice. Arista Networks
and the Arista logo are trademarks of Arista Networks, Inc in the United States and other countries. Other product or service
names may be trademarks or service marks of others.
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Santa Clara, CA 95054
USA
408 547-5500
www.arista.com
Support
408 547-5502
866 476-0000
[email protected]
Sales
408 547-5501
866 497-0000
[email protected]

Quick Start Guide: 7300 Series Modular Data Center Switches iii
Table of Contents
Chapter 1 Overview.............................................................................................................1
1.1 Scope...................................................................................................................................................... 1
1.2 Receiving and Inspecting the Equipment................................................................................................ 1
1.3 Installation Process................................................................................................................................. 1
1.4 Safety Information................................................................................................................................... 2
1.5 Obtaining Technical Assistance.............................................................................................................. 2
1.6 Specifications.......................................................................................................................................... 2
Chapter 2 Preparation.........................................................................................................7
2.1 Site Selection.......................................................................................................................................... 7
2.2 Tools Required for Installation ................................................................................................................ 8
2.3 Electrostatic Discharge (ESD) Precautions ............................................................................................ 9
Chapter 3 Rack Mounting the Switch ..............................................................................11
3.1 Two-Post Rack Mount........................................................................................................................... 11
3.1.1 Attaching Mounting Brackets to the Chassis ........................................................................... 11
3.1.2 Inserting the Switch into the Rack............................................................................................ 11
3.2 Four-Post Rack Mount.......................................................................................................................... 13
3.2.1 Component Description ........................................................................................................... 13
3.2.1.1 Shelves ............................................................................................................................... 13
3.2.1.2 Mounting Ears..................................................................................................................... 14
3.2.2 Component Placement ............................................................................................................ 14
3.2.3 Switch Mounting Process......................................................................................................... 15
3.2.3.1 Shelf Installation ................................................................................................................. 15
3.2.3.2 Mounting Ear Installation .................................................................................................... 17
3.2.3.3 Inserting the Switch into the Rack ...................................................................................... 18
Chapter 4 Powering the Modular Switch.........................................................................19
4.1 Cabling the AC Power Supply............................................................................................................... 20
4.1.1 Grounding the Switch............................................................................................................... 20
4.1.2 Connecting Power Cables to an AC Power Supply ................................................................. 20
4.2 Cabling the DC Power Supply .............................................................................................................. 21
4.2.1 DC Power Adapter Installation.................................................................................................22
4.2.1.1 Connecting the Power Cable Lug to the Terminal Studs.................................................... 22

iv Quick Start Guide: 7300 Series Modular Data Center Switches
Chapter 5 Connecting Serial and Management Cables .................................................27
5.1 Connecting Supervisor Cables ............................................................................................................. 27
5.2 Connecting Linecard Modules and Cables ...........................................................................................28
Chapter 6 Configuring the Switch ...................................................................................29
Appendix A Status Indicators...........................................................................................31
A.1 Supervisor Module................................................................................................................................ 31
A.2 Line Card Module Indicators................................................................................................................. 32
A.3 Fan and Fabric Status Indicators.......................................................................................................... 33
A.4 Power Supply Status Indicators............................................................................................................ 34
Appendix B Fabric and Fan-only Module Handling........................................................37
B.1 Fabric and Fan-only Module Description .............................................................................................. 37
B.2 Handling Fabric Modules ...................................................................................................................... 38
B.2.1 Removing Fabric Modules ....................................................................................................... 38
B.2.2 Inserting Fabric Modules.......................................................................................................... 39
B.3 Handling Fan-only Modules .................................................................................................................. 40
B.3.1 Removing Fan-only Modules ................................................................................................... 40
B.3.2 Inserting Fan-only Modules...................................................................................................... 40
Appendix C Parts List........................................................................................................41
C.1 Parts Used in All Configurations ........................................................................................................... 41
C.2 Four-Post Rack Mount Parts................................................................................................................. 42
C.3 Two-Post Rack Mount Parts ................................................................................................................. 42
Appendix D Front Panels ..................................................................................................45
Appendix E Rear Panels ...................................................................................................49
Appendix F Line Cards .....................................................................................................53

Quick Start Guide: 7300 Series Modular Data Center Switches 1
Chapter 1
Overview
1.1 Scope
This guide is intended for properly trained service personnel and technicians who need to install the
following Arista Networks Data Center Switches:
• DCS-7304
• DCS-7308
• DCS-7316
• DCS-7324
• DCS-7328
Important! Only qualified personnel should install, service, or replace this equipment.
1.2 Receiving and Inspecting the Equipment
Upon receiving the switch, inspect the shipping boxes and record any external damage. Retain packing
materials if you suspect that part of the shipment is damaged; the carrier may need to inspect them.
If the boxes were not damaged in transit, unpack them carefully. Ensure that you do not discard any
accessories that may be packaged in the same box as the main unit.
Inspect the packing list and confirm that you received all listed items. Compare the packing list with
your purchase order. Appendix C provides a list of components included with the switch.
1.3 Installation Process
The following tasks are required to install and use the switch:
Step 1 Select and prepare the installation site (Section 2.1).
Step 2 Assemble the installation tools listed in Section 2.2.
Step 3 Attach the mounting brackets and install the switch in an equipment rack (Chapter 3).
Step 4 Connect the switch to the power source and network devices (Chapter 4 and Chapter 5).
Step 5 Configure the switch (Chapter 6).

2 Quick Start Guide: 7300 Series Modular Data Center Switches
Safety Information Chapter 1: Overview
Important! Class 1 Laser Product: This product has provisions to install Class 1 laser transceivers that provides
optical coupling to the communication network. Once a Class 1 laser product is installed, the
equipment is a Class 1 Laser Product (Appareil à Laser de Classe 1). The customer is responsible for
selecting and installing the Class 1 laser transceiver and for insuring that the Class 1 AEL (Allowable
Emission Limit) per EN/IEC 6-825, CSA E60825-1, and Code of Federal Regulations 21 CFR 1040 is
not exceeded after the laser transceiver have been installed. Do not install laser products whose class
rating is greater than 1. Refer to all safety instructions that accompanied the transceiver prior to
installation. Only Class 1 laser devices certified for use in the country of installation by the cognizant
agency are to be utilized in this product.
Important! Ultimate disposal of this product must be handled in accordance with all national laws and regulations.
The fabric module requires special handling when removing, inserting, or handling the component.
Appendix B provide instructions for handing fabric modules.
1.4 Safety Information
Refer to the Arista Networks document Safety Information and Translated Safety Warnings available at:
http://www.arista.com/support/docs/eos
1.5 Obtaining Technical Assistance
Any customer, partner, reseller or distributor holding a valid Arista Service Contract can obtain
technical support in any of the following ways:
•Email: [email protected]. This is the easiest way to create a new service request.
Include a detailed description of the problem and the output of “show tech-support”.
•Web: www.arista.com/en/support.
A support case may be created through the support portal on our website. You may also download
the most current software and documentation, as well as view FAQs, Knowledge Base articles,
Security Advisories, and Field Notices.
•Phone: [phone] or 408-547-5502.
Important! No user serviceable parts inside. Refer all servicing to qualified service personnel.
1.6 Specifications
Table 1-1 lists specifications of Arista Data Center modular switches and components covered by this
guide.
Table 1-1 7300 Modular Switch and Component Specifications
DCS-7304/7324 DCS-7308/7328 DCS-7316
Height 8 RU: 353mm (13.9 inches) 13 RU: 572 mm (22.5 inches) 21 RU: 930 mm (36.6 inches)
Width 442 mm (17.4 inches) 442 mm (17.4 inches) 442 mm (17.4 inches)
Depth 602 mm (23.7 inches) 602 mm (23.7 inches) 706 mm (27.8 inches)

Chapter 1: Overview Specifications
Quick Start Guide: 7300 Series Modular Data Center Switches 3
Table 1-2 lists power specifications of modular switch components.
Weight
Empty 36 kg (78 lbs) 50 kg (110 lbs) 81 kg (178 lbs)
Fully Loaded 89 kg (196 lbs) 140 kg (309 lbs) 244 kg (536 lbs)
Input Power (per circuit)
AC Power 200 - 240 VAC, 16 A (20 A
US), 50 or 60 Hz
200 - 240 VAC, 16 A (20 A
US),50or60Hz
200 - 240 VAC, 16 A (20 A
US), 50 or 60 Hz
DC Power -48 - -60 VDC, 80 A -48 - -60 VDC, 80 A -48 - -60 VDC, 80 A
Branch Circuit Protection
AC Power 20A 20A 20A
DC Power 100A 100A 100A
Input Power Circuits 1to4circuits 2to6circuits 3to8circuits
Operating Temperature
Storage Temperature
Operating Altitude
Relative Humidity
0° to 40° C (32° to 104° F)
-40° to 70° C (-40° to 158° F)
0 to 3,000 meters (0 to 10,000
feet)
5to90%
0° to 40° C (32° to 104° F)
-40° to 70° C (-40° to 158° F)
0 to 3,000 meters (0 to 10,000
feet)
5to90%
0° to 40° C (32° to 104° F)
-40° to 70° C (-40° to 158° F)
0 to 3,000 meters (0 to 10,000
feet)
5to90%
Cooling 6000 W maximum 9000 W maximum 12000 W maximum
Table 1-1 7300 Modular Switch and Component Specifications
DCS-7304/7324 DCS-7308/7328 DCS-7316
Table 1-2 7300 Series Power Specifications
Module Type Part Number Power Draw/ Typical Maximum
Supervisor Modules DCS-7300(-D)-SUP 65 W / 80 W
Linecard Modules DCS-7300X-32Q-LC
DCS-7300X-64S-LC
DCS-7300X-64T-LC
DCS-7320X-32C-LC
219 W / 372 W
166 W / 232 W
279 W / 430 W
428 W / 516 W
Fabric Modules DCS-7304X-FM
DCS-7308X-FM
DCS-7316X-FM
DCS-7324X-FM
DCS-7328X-FM
98 W / 172 W
195 W / 343 W
550 W / 760 W
192W / 288 W
380W / 578 W
Fan-Only Modules DCS-7304-S-FAN
DCS-7308-S-FAN
16W / 32W
32W / 64W
Power Supplies PWR-2700-DC (fan power)
PWR-3K-AC (fan power)
PWR-3KT-AC (fan power)
43 W/ 43 W
43 W/ 43 W
43 W/ 43 W
7304 Series System Full chassis loaded with four
DCS-7300X-64T-LC line cards
1573 W / 3048 W
7308 Series System Full chassis loaded with eight
DCS-7300X-64T-LC line cards
3077 W / 4972 W

4 Quick Start Guide: 7300 Series Modular Data Center Switches
Specifications Chapter 1: Overview
Table 1-3 lists 7300X Series switch components.
Table 1-4 lists 7320X Series switch components.
7316 Series System Full chassis loaded with Sixteen
DCS-7300X-64T-LC line cards
6729 W / 10080 W
7324 Series System Full chassis loaded with four
DCS-7320X-32C-LC line cards
2545 W / 3376 W
7328 Series System Full chassis loaded with eight
DCS-7320X-32C-LC line cards
5009 W / 6600 W
Table 1-2 7300 Series Power Specifications (Continued)
Module Type Part Number Power Draw/ Typical Maximum
Table 1-3 7300X Series
Chassis Model Fabric Module Fan-only Module Fan Spare Line Card Power Supply
DCS-7304
(Forward)
DCS-7304X-FM-F DCS-7304-S-FAN-F FAN-7002-F DCS-7300X-32Q-LC
DCS-7300X-64S-LC
DCS-7300X-64T-LC
PWR-3K-AC-F
PWR-2700-DC-F
DCS-7304
(Reverse)
DCS-7304X-FM-R DCS-7304-S-FAN-R FAN-7002-R DCS-7300X-32Q-LC
DCS-7300X-64S-LC
DCS-7300X-64T-LC
PWR-3K-AC-R
PWR-2700-DC-R
DCS-7308
(Forward)
DCS-7308X-FM-F DCS-7308-S-FAN-F FAN-7002-F DCS-7300X-32Q-LC
DCS-7300X-64S-LC
DCS-7300X-64T-LC
PWR-3K-AC-F
PWR-2700-DC-F
DCS-7308
(Reverse)
DCS-7308X-FM-R DCS-7308-S-FAN-R FAN-7002-R DCS-7300X-32Q-LC
DCS-7300X-64S-LC
DCS-7300X-64T-LC
PWR-3K-AC-R
PWR-2700-DC-R
DCS-7316
(Forward)
DCS-7316X-FM-F Not Available FAN-7002-F DCS-7300X-32Q-LC
DCS-7300X-64S-LC
DCS-7300X-64T-LC
PWR-3K-AC-F
PWR-2700-DC-F
PWR-3K-AC-R
PWR-2700-DC-R
DCS-7316
(Reverse)
DCS-7316X-FM-R Not Available FAN-7002-R DCS-7300X-32Q-LC
DCS-7300X-64S-LC
DCS-7300X-64T-LC
PWR-3K-AC-F
PWR-2700-DC-F
PWR-3K-AC-R
PWR-2700-DC-R
Table 1-4 7320X Series
Chassis Model Fabric Module Fan Spare Line Card Power Supply
DCS-7324X
(Forward)
DCS-7324X-FM-F FAN-7002H-F DCS-7320X-32C-LC PWR-3KT-AC-BLUE
DCS-7328X
(Forward)
DCS-7328X-FM-F FAN-7002H-F DCS-7320X-32C-LC PWR-3KT-AC-BLUE

Chapter 1: Overview Specifications
Quick Start Guide: 7300 Series Modular Data Center Switches 5
Table 1-5 lists an AC and DC power supply unit (PSU) comparison of circuit, cabling, and airflow for the
DCS-7304, DCS-7308, and DCS-7316.
Table 1-6 lists the power supply setup for LED status indicators.
Table 1-5 AC/DC PSU comparison (Circuit, Cabling, and Airflow for DCS-7304, DCS-7308, and DCS-7316)
Model
Supported
Chassis
Input Power
(Per Circuit)
Branch
Circuit
Protection
Required Cabling and Interconnect
Description Qty PSU Air Flow
PWR-3K-AC-R
PWR-3K-AC-F
DCS-7304
DCS-7308
DCS-7316
200 - 240 VAC
16 A (20 A US)
50 or 60 Hz
20A Power cables:
14 AWG,
C19-C20
One for each
AC power
supply module
supplied with
switch.
Reverse (Red)
Forward (Blue)
PWR-3KT-AC-
BLUE
DCS-7304
DCS-7308
200 - 240 VAC
16 A (20 A US)
50 or 60 Hz
20A Power cables:
14 AWG,
C19-C20
One for each
AC power
supply module
supplied with
switch.
Forward (Blue)
PWR-2700-DC-R
PWR-2700-DC-F
DCS-7304
DCS-7308
DCS-7316
-48 to -60 VDC
80 A
100A DC Adapter
(Arista part
number
CON-00581)
2 hole
compression
lug (not
included)
One DC
adapter per
power supply
2 compression
lugs per DC
Adapter
Reverse (Red)
Forward (Blue)
PWR-3K-DC-BLUE DCS-7304
DCS-7308
-48 to -60 VDC
82.5A
100A 2 hole
compression
lug (not
included)
2 compression
lugs per DC
Adapter
Forward (Blue)
Table 1-6 Power Supply Setup for LED Status
Power Supply
State
LED
Name
PWR-3K-AC-Blue PWR-3KT-AC-R PWR-2700-DC-R PWR-3K-DC-Blue
PWR-3K-AC-Red PWR-3KT-AC -F PWR-2700-DC-F PWR-3K-DC-Red
Input power present
Normal Operation
Vin Good
DC Good
Fault
Green
Green
Off
Green
Green
Off
Green
Green
Off
Green
Input power present
Main output off
Vin Good
DC Good
Fault
Green
Off
Off
Green
Off
Off
Green
Off
Off
Blinking Green
Input power present
Power Supply Fault
Vin Good
DC Good
Fault
Green
Off
Blinking Amber
Green
Off
Blinking Amber
Green
Off
Blinking Amber
Blinking Amber,
1 sec on, 1 sec off
No Input Power
Supply installed in
chassis
Vin Good
DC Good
Fault
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Input power present
Supply not seated in
chassis
Vin Good
DC Good
Fault
Off
Off
Off
Off
Off
Blinking Amber
Off
Off
Off
Blinking Amber,
0.5 sec on/off

6 Quick Start Guide: 7300 Series Modular Data Center Switches
Specifications Chapter 1: Overview

Quick Start Guide: 7300 Series Modular Data Center Switches 7
Chapter 2
Preparation
2.1 Site Selection
The following criteria should be considered when selecting a site to install the switch:
Floor Space: Install the switch in an area that provides adequate clearance for removing front and rear
components. Figure 2-1 displays switch clearance requirements.
Figure 2-1: Switch Component Removal Footprint
•Temperature and Ventilation: For proper ventilation, install the switch where there is ample
airflow to the front and back of the switch. The temperature should not go below 0° or exceed 40° C.
Important! To prevent the switch from overheating, do not operate it in an area where the ambient temperature
exceeds limits specified in Table 1-1 on page 2.
•Airflow Orientation: Determine airflow direction of the fan modules and power supply modules.
Fan and power supply module handles indicate airflow direction:
•Blue Handle: Air Inlet module.
•Red Handle: Air Exit module.
Appendix D displays power supply module locations on the front panel. Appendix E displays fan
module locations on the rear panel (DCS-7316 switches may also contain rear panel power supply
modules). Verify the airflow direction of all modules satisfy these criteria:
• All rear panel modules have the same color handles.

8 Quick Start Guide: 7300 Series Modular Data Center Switches
Tools Required for Installation Chapter 2: Preparation
• All front panel modules have the same color handles.
• Rear panel modules must have different color handles than front panel modules.
Orient the switch to assure that the air intake modules face the cool aisle. If the airflow direction is
not compatible with the installation site, contact your sales representative to obtain modules that
circulate air in the opposite direction.
•Rack Space: Install the switch in a 19" rack or cabinet. The switch height depends on the switch
model, as specified in Table 1-1 on page 2. Verify that the linecard and supervisor removal
clearance (Figure 2-1 on page 7) provide adequate space for the power and data cables that
connect to the switch.
When mounting the switch in a partially filled rack, load the rack from bottom to top, with the
heaviest equipment at the bottom. Load the switch at the bottom if it is the only item in the rack.
The accessory kit provides mounting brackets for four-post racks. Contact your sales
representative to obtain two-post mounting racks.
•Power Requirements: Power requirements vary by switch. Refer to Table 1-1 on page 2 for
information regarding your specific system.
Multiple circuits provide redundancy protection. The switch uses power cables that have an
IEC-320 C19 plug. The accessory kit provides IEC-320 C19 to C20 power cables.
Important! All power input plug-socket combinations must be accessible at all times; they provide the primary
method of disconnecting power from the system.
•Other Requirements: Select a site where liquids or objects cannot fall onto the equipment and
foreign objects are not drawn into the ventilation holes. Verify these guidelines are met:
• Clearance areas to the front and rear panels allow for unrestricted cabling.
• All front and rear panel indicators can be easily read.
• AC power cords can reach from the AC power outlet to the connectors on the front panel.
Important! Disconnecting power to all input sockets is required to completely power off the unit.
2.2 Tools Required for Installation
Each switch provides an accessory kit that contains parts for installing the switch into a four-post rack.
Two-post rack mount parts are available through your sales representative. Accessory kits do not
include screws, nuts, or bolts for attaching the switch to a conventional rack.
In addition to the accessory kit, the following tools are required to install a modular switch:
All Racks
• Mechanical device capable of lifting chassis being installed (chassis weight listed in Table 1-1 on
page 2).
Two-Post Conventional Rack
• Screws or rack mounting nuts and bolts.
• Screwdriver.
Four-Post Tool-less Rack
No additional equipment required.

Chapter 2: Preparation Electrostatic Discharge (ESD) Precautions
Quick Start Guide: 7300 Series Modular Data Center Switches 9
Four-Post Conventional Rack
• Screws or rack mounting nuts and bolts.
• Screwdriver.
2.3 Electrostatic Discharge (ESD) Precautions
Observe these guidelines to avoid ESD damage when installing or servicing the switch.
• Assemble or disassemble equipment only in a static-free work area.
• Use a conductive work surfaces (such as an antistatic mat) to dissipate static charge.
• Wear an ESD wrist strap to dissipate static charge accumulation.
• Minimize handling of assemblies and components.
• Keep replacement parts in their original static-free packaging.
• Remove all plastic, foam, vinyl, paper, and other static-generating materials from the work area.
• Use tools that do not create ESD.

10 Quick Start Guide: 7300 Series Modular Data Center Switches
Electrostatic Discharge (ESD) Precautions Chapter 2: Preparation

Quick Start Guide: 7300 Series Modular Data Center Switches 11
Chapter 3
Rack Mounting the Switch
Important! The rack mounting procedure is identical for all modular switches. Illustrations in this chapter depict the
mounting of an unpopulated DCS-7304 chassis.
•Section 3.1 provides instructions for mounting the switch in a two-post rack.
•Section 3.2 provides instructions for mounting the switch in a four-post rack.
After completing the instructions for your rack type, proceed to Chapter 4.
3.1 Two-Post Rack Mount
To mount the switch to a two-post rack, assemble mounting brackets to the middle of the chassis, then
attach the brackets to the rack.
Important! Two-post rack mount parts are only available through your sales representative. Two-post rack
mounting is not supported for DCS-7316 switches.
The accessory kit includes the following two-post mounting parts:
• 2 center-mount brackets
• 16 (DCS-7304) or 20 (DCS-7308) M4x8 panhead Phillips screws
3.1.1 Attaching Mounting Brackets to the Chassis
Step 1 Orient the switch chassis and the two center-mount brackets (Figure 3-1).
Position the flanges that attach to the rack posts toward the front of the chassis.
Step 2 Attach both center-mount brackets to the chassis with the provided M4x8 panhead Phillips
screws. Secure the bracket by attaching screws through each bracket hole.
3.1.2 Inserting the Switch into the Rack
Step 1 Move the chassis to the rack using a mechanical lift (Figure 3-2-left).
If modules are inserted in the chassis, use the lift carefully to avoid damaging any components.
Step 2 Lift the chassis into the rack. Position the flanges against the rack posts (Figure 3-2-right).
Step 3 Select mounting screws that fit your equipment rack.

12 Quick Start Guide: 7300 Series Modular Data Center Switches
Two-Post Rack Mount Chapter 3: Rack Mounting the Switch
Figure 3-1: Attaching the Center-mount Brackets
Figure 3-2: Lifting the Switch Chassis into the Two Post Rack
Step 4 Attach the bracket flanges to the rack posts. Secure the switch to the rack with screws through
each bracket hole.
After completing the two-post installation, proceed to Chapter 4.

Chapter 3: Rack Mounting the Switch Four-Post Rack Mount
Quick Start Guide: 7300 Series Modular Data Center Switches 13
3.2 Four-Post Rack Mount
The switch is mounted onto a four-post rack by assembling a shelf into the rack, then attaching the
switch on the shelf. The four-post rack mount instructions include these sections:
•Section 3.2.1: Component Description
•Section 3.2.2: Component Placement
•Section 3.2.3: Switch Mounting Process
3.2.1 Component Description
The four-post mount accessory kit contains these components:
• 1 Left Shelf and 1 Right Shelf (Section 3.2.1.1)
• 2 Mounting Ears (Section 3.2.1.2)
Important! Components are designed for tool-less installation in square-hole racks. To install the switch in round
hole or threaded hole racks, remove all rack plugs (described below) and attach all components with
nuts and bolts that fit the rack.
3.2.1.1 Shelves
The two shelves are almost identical, differing in that 1) they are mirror-images of each other, and 2)
the left shelf includes a stabilizer bar. Each shelf is a two-piece mechanism. The base includes the
surface upon which the switch is placed and is oriented towards the front of the rack. The slide-end
adjusts the shelf’s length for fitting the shelf between front and rear posts of various size racks.
Figure 3-3 displays the inner view of the left shelf. Depending on the rack kit ordered, each shelf may
include latches to the locking mechanism that secures the shelf to the rack. If the locking mechanism
is not present, the kit shall be attached with appropriate screws (not included). Figure 3-3 displays
latches that are closed; the insets display open latches The inner side of each shelf is oriented toward
the center of the rack.
Figure 3-3: Left Shelf – Inner View
Figure 3-4 on page 14 displays the outside view of the right shelf, from where rack plugs and guide pins
that insert into rack posts are visible (Insets A and B). To install shelves into posts with threaded or
rounded holes, attach the shelves with bolts that fit the rack. Remove all plugs from the shelves if
present.

14 Quick Start Guide: 7300 Series Modular Data Center Switches
Four-Post Rack Mount Chapter 3: Rack Mounting the Switch
Figure 3-4: Right Shelf – Outer View
3.2.1.2 Mounting Ears
Figure 3-5 displays the mounting ears, which secure the switch top to the rack. The two mounting ears
are identical and installed above each shelf. The inner side of each ear may include a latch to the
locking mechanism that secures the ear to the rack.
Rack posts and guide pins that insert into the rack are visible from the outer side of the ear (Inset B).
To install ears into posts with threaded or rounded holes, remove both plugs from each ear, then install
the ears with screws that fit the rack.
Figure 3-5: Mounting Ears
3.2.2 Component Placement
Figure 3-6 on page 15 displays component placement for a 7304 (8-RU) switch. Mounting ears brace
the top of the switch; their rack placement position differs for each switch model. Using the placement
of the shelves’ bottom front rack plug as a reference (first RU and first hole), the mounting ears are
placed as follows:
• 7304: 8th RU (22nd through 24th holes)
• 7308: 13th RU (37th through 39th holes)
• 7316: 21st RU (61st through 63rd holes)

Chapter 3: Rack Mounting the Switch Four-Post Rack Mount
Quick Start Guide: 7300 Series Modular Data Center Switches 15
Figure 3-6: Component Placement
3.2.3 Switch Mounting Process
The switch mounting process consists of three steps: 1) installing the shelves; 2) installing the
mounting ears; and 3) placing and securing the switch upon the shelves.
3.2.3.1 Shelf Installation
The installation process for each shelf is identical. The shelves must be installed on the same
horizontal level. In the following section, inner side illustrations feature the left shelf and outer side
illustrations feature the right shelf.
Perform the following procedure for each shelf:
Step 1 If applicable, verify that both locking mechanism latches on the shelf are open (Figure 3-4,
insets A and B). Racks that do not require the locking mechanism, skip to step 2.
Step 2 Attach the front side of the shelf to its corresponding front rack post by inserting the shelf-side
rack plugs and guide pins into post slots (Figure 3-7 on page 16).
The shelf ledge must be between the front posts. If the rack plugs were previously removed,
use bolts to attach the shelf to the rack and skip to step 4.

16 Quick Start Guide: 7300 Series Modular Data Center Switches
Four-Post Rack Mount Chapter 3: Rack Mounting the Switch
Figure 3-7: Attaching the Right Shelf
Step 3 Close the front locking mechanism latch (Figure 3-4).
Step 4 Glide the slide-end to a position outside of its rear rack post (Figure 3-8).
Figure 3-8: Adjusting the Right Shelf
Step 5 Attach the back-side of the shelf into the rear shelf by gliding the slide-end such that the rack
plugs and guide pins are inserted into the rack post holes (Figure 3-9 on page 17).
The bottom rack plug must be inserted one RU (three rack holes) above the bottom rack plug
on the front side of the shelf. If the locking mechanism and plugs are not used, fasten the
back-side of the shelf to the rear shelf, and skip step 6.