Arista DCS-7508 User manual

Quick Start Guide
Modular Data Center Switches
DCS-7508 / 7508E
DCS-7504 / 7504E
Arista Networks
www.aristanetworks.com
PDOC-00015-04

© Copyright 2013 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.
Headquarters
5470 Great America Parkway
Santa Clara, CA 95054
USA
408 547-5500
www.aristanetworks.com
Support
408 547-5502
866 476-0000
[email protected]
Sales
408 547-5501
866 497-0000
[email protected]

Chapter 1: Overview
Modular Switch Quick Start Guide PDOC-00015-04 3
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-7504 / 7504E
• DCS-7508 / 7508E
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 the
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 as described in 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 as described in
Chapter 3.
Step 4 Connect the switch to the power source and network devices as described in Chapter 4.
Step 5 Configure the switch as described in Chapter 5.

4 Arista Networks Copyright2013
Chapter 1: Overview
1.4 Specifications
Table 1 lists the specifications of Arista Data Center modular switches covered by this guide.
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.
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.aristanetworks.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.
Important! Ultimate disposal of this product should be handled in accordance with all national laws and
regulations.
Table 1: Modular Switch Specifications
DCS-7508 / DCS-7508E DCS-7504 / DCS-7504E
Height 11U: 483 mm (19.05 inches) 7 U: 308 mm (12.13 inches)
Width 446 mm (17.56 inches) 446 mm (17.56 inches)
Depth 759 mm (29.88 inches) 759 mm (29.88 inches)
Weight 136 kg (300 pounds) 92 kg (202 pounds)
Input Power (per circuit) 200-240 VAC, 50 or 60 hz, 20 A 200-240 VAC, 50 or 60 hz, 20 A
Input Power Circuits 2 to 4 circuits 1 to 4 circuits
Ambient Temperature 0° – 40° C (32° – 104° F) 0° – 40° C (32° – 104° F)
Altitude 0 – 3000 meters (0 – 10,000 feet) 0 – 3000 meters (0 – 10,000 feet)
Cooling 6600 W maximum 3300 W maximum

Chapter 2: Preparation
Modular Switch Quick Start Guide PDOC-00015-04 5
Chapter 2 Preparation
2.1 Site Selection
The following criteria should be considered when selecting a site to install the switch:
•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 40°C (104°F).
•Airflow Orientation: The fans direct air from the front panel to the rear panel. Orient the front
panel toward the cool aisle.
•Rack Space: Install the switch in a 19" rack or cabinet. The switch height is 11 RU (7508 / 7508E) or
7 RU (7504 / 7504E). The accessory kit provides mounting brackets for two-post and four-post racks.
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.
•Power Requirements: The 7508 / 7508E switch requires two 200-240 VAC, 50 or 60 Hz, 20 A circuits.
The 7504 / 7504E switches require one 200-240 VAC, 50 or 60 Hz, 20 A circuit.
Four circuits provide redundancy protection. The switch uses power cables that comply with
IEC-320 and have a C19 plug. The accessory kit provides four IEC-320 C19 to C20 power cables, each
two meters long.
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.

6 Arista Networks Copyright2013
Chapter 2: Preparation
2.2 Tools Required for Installation
The following tools are required to install a modular switch:
• Mechanical device capable of lifting chassis being installed (Table 1).
• Adjustable wrench (provided)
• Phillips #2 screwdriver
• Phillips #3 screwdriver
Tw o - p o s t r a c k m o u n t s :
• Eight equipment rack screws (all two-post rack mounts).
• Eight equipment rack nuts (two-post rack mount with unthreaded rack post holes).
Four-port rack mounts:
• Eight equipment rack screws (four-post rack mount with threaded rack post holes).
Accessory kit provides rack screws for four-post rack mount with unthreaded rack post holes.
The accessory kit includes screws that fit many common equipment racks.
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.

Chapter 3: Rack Mounting the Switch
Modular Switch Quick Start Guide PDOC-00015-04 7
Chapter 3 Rack Mounting the Switch
The accessory kit provides components for installing the switch in two-post and four-post racks.
• 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.
The rack mounting procedure is identical for all modular switches. Illustrations in this chapter depict
the mounting of an unpopulated DCS-7508 chassis.
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. The switch does not support a front or rear mount into a two-post rack.
The accessory kit includes the following two-post mounting parts:
•2center-mountbrackets
• 20 M4x8 panhead Phillips screws
Figure 22 on page 25 displays the two-post mounting parts.
3.1.1 Attaching Mounting Brackets to the Chassis
Step 1 Orient the switch chassis and the two center-mount brackets (Figure 1).
Position the flanges that attach to the rack posts toward the rear of the chassis.
Step 2 Attach both center-mount brackets to the chassis.
Each bracket requires ten M4x8 panhead Phillips screws.
Figure 1: Attaching the Center-mount Brackets

8 Arista Networks Copyright2013
Chapter 3: Rack Mounting the Switch
3.1.2 Inserting the Switch into the Rack
Step 1 Move the chassis to the rack using a mechanical lift (Figure 2).
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 2).
Step 3 Select mounting screws that fit your equipment rack.
A minimum of four screws is required on each side of the chassis. The accessory kit provides
screws that fit many common equipment racks. When installing the switch into a rack with
unthreaded post holes, nuts are also required to secure the switch to the rack posts.
Step 4 Attach the bracket flanges to the rack posts (Figure 3). Space the screws evenly along the flange.
After completing the two-post installation, proceed to Chapter 4.
Figure 2: Lifting the Switch Chassis into the Two Post Rack
Figure 3: Attaching Flanges to the Rack Post

Chapter 3: Rack Mounting the Switch
Modular Switch Quick Start Guide PDOC-00015-04 9
3.2 Four-Post Rack Mount
The switch is mounted onto a four-post rack by assembling a shelf into the rack, then placing the switch
on the shelf.
The accessory kit provides the following four-post mounting parts:
•2frontbrackets
•4shelfsupports
• 2 back brackets (not needed for racks with threaded holes)
• left shelf
•rightshelf
Figure 23 on page 26 displays the four-post mounting parts.
3.2.1 Assembling the Shelf
Step 1 Attach the front bracket and shelf support to the left front rack post, as shown in Figure 4. An
up arrow is printed on the shelf support to indicate its proper orientation.
Unthreaded rack holes: Use the M6 screws and cage nuts supplied in the accessory kit.
Threaded rack holes: Attach the front bracket to the post with screws that can be threaded
through the rack post. Secure the shelf support to the post with nuts that fit the screws threaded
through the post.
Step 2 Repeat step 1 on the right front rack post, assembling the parts at the same vertical level as those
on the left rack post.
Step 3 Attach the shelf support and back bracket to the left rear post (Figure 5-left). The shelf support
must be assembled at the same vertical level on the front and rear posts (Figure 5-right). An up
arrow is printed on the shelf support to indicate its proper orientation.
Unthreaded rack holes: Attach the parts as displayed in Figure 5-left.
Figure 4: Left Front Post Assembly: Four Post Rack Mount

10 Arista Networks Copyright2013
Chapter 3: Rack Mounting the Switch
Threaded rack holes: Attach the shelf support to the post with screws that thread into the rack
post. The back bracket is not required on threaded racks.
Step 4 Adjust the left shelf by sliding its components to fit between the front left and front rear rack
posts, as shown in Figure 6.
Step 5 Lift the left shelf above the shelf supports installed on the left front and left rear rack posts
(step 1 and step 3). Align the holes (Inset A) and hook (Inset B) with the stubs on the brackets.
Lower the shelf such that the bracket stubs are inserted into the shelf holes and hook.
Press down firmly on the shelf to ensure it is seated securely on the rack posts..
Step 6 Install the right shelf on the right front and right rear rack posts by repeating step 4 and step 5
to obtain the rack configuration shown in Figure 8.
Figure 5: Left Rear Post Assembly and Shelf Support Orientation: Four Post Rack Mount
Figure 6: Adjusting the Left Shelf

Chapter 3: Rack Mounting the Switch
Modular Switch Quick Start Guide PDOC-00015-04 11
3.2.2 Inserting the Switch into the Rack
Step 1 Move the chassis to the rack using a mechanical lift (Figure 9).
If modules are inserted in the chassis, use the lift carefully to avoid damaging any components.
Step 2 Lift the chassis into the rack.
Figure 7: Seating the Left Shelf
Figure 8: Both Switch Shelves Installed

12 Arista Networks Copyright2013
Chapter 3: Rack Mounting the Switch
Step 3 Secure the chassis by tightening the four thumbscrews on the front flanges into the rack posts
(Figure 10).
After completing the Four-Post Installation, proceed to Chapter 4.
Figure 9: Lifting the Switch Chassis
Figure 10: Inserting the Switch onto the Rack Shelf

Chapter 4: Cabling the Modular Switch
Modular Switch Quick Start Guide PDOC-00015-04 13
Chapter 4 Cabling the Modular Switch
4.1 Grounding the Switch
After mounting the switch into the rack, connect the switch to the data center ground. Figure 11
displays the location of the grounding pads located on both sides of the power input sockets.
After the switch is grounded, ESD wrist straps can be grounded by connecting them to one of the ESD
grounding ports located between the power input sockets, (Figure 11) or the rear panel (Figure 12
depicts the location on the 7504. Receptacles are available in similar locations on other switch models).
Figure 11: Grounding Pad and ESD Grounding Port Sockets
Figure 12: ESD Grounding Port – Rear Panel

14 Arista Networks Copyright2013
Chapter 4: Cabling the Modular Switch
4.2 Connecting Power Cables
Important! Installation of this equipment must comply with local and national electrical codes. If necessary, consult
with the appropriate regulatory agencies and inspection authorities to ensure compliance.
The switch operates with four power supplies, each of which connects to circuits that provide 200-240
VAC, 50 or 60 Hz, and 20 A.
• DCS-7508 / 7508E requires the connection of at least two power supplies to active circuits.
• DCS-7504 / 7504E requires the connection of one power supply to an active live circuit.
Connecting power to all four power supplies protects against up to two failed power supplies and can
provide grid-level redundancy. Energizing any power supply causes all power supply fans to function.
Figure 13 displays the power input sockets. Appendix D displays the front panel location of the sockets.
Important! Read all installation instructions before connecting the system to the power source.
•Non-Redundant Configuration: Provide power to any two of the four power inputs.
•Redundant Power Supply Configuration: Provide power to all four power inputs.
•Power down the Switch: Remove all power cords from the power input sockets.
Each power supply includes a fan that maintains proper power supply temperature and cools the
supervisor modules located below the power input sockets. The power supply fans are in addition to
the fan modules located behind the power supplies. These appendices display the location of the
following component on all switches described in this guide.
• Appendix D displays the front panel location of the power input sockets and supervisor modules.
• Appendix E displays the rear panel location of power supplies and fan modules.
The switch uses power cables that comply with IEC-320 and have a C19 plug. The accessory kit provides
four IEC-320 C19 to C20 power cables, each two meters long.
To insert a power cable:
Step 1 Lift the retaining clip on each power input socket.
Step 2 Plug the power cables into the sockets.
Step 3 Adjust the retaining clips if needed for your power cords.
Step 4 Push the retaining clip back down over the cable.
Important! This equipment must be grounded. Never defeat the ground conductor.
Important! This unit requires overcurrent protection.
Figure 13: Power Input Sockets

Chapter 4: Cabling the Modular Switch
Modular Switch Quick Start Guide PDOC-00015-04 15
4.3 Connecting Supervisor Cables
Supervisor modules contain console, management, and USB ports. Figure 14 displays port locations on
the Supervisor-1 module.
Figure 15 displays port locations on the Supervisor-E module.
•Console (Serial) Port: Connect to a PC with RJ-45 to DB-9 serial adapter cable. Default switch
settings include:
—9600baud —Noparitybits
— No flow control — 8 data bits
—1stopbit
•Ethernet management port: Connect to 10/100/1000 management network with RJ-45 cable.
•USB Port: May be used for software or configuration updates.
4.4 Connecting Linecard Modules and Cables
Install required SFP, SFP+, and QSFP+ optic modules in linecard module ports (Figure 16).
Connect cables as required to linecard module ports or fixed MPO ports. Supervisor and linecard
module ejectors on the front of the chassis assist with cable management.
Caution Excessive bending can damage interface cables, especially optical cables.
Figure 14: Supervisor-1 Ports
Figure 15: Supervisor-E Ports
Figure 16: SFP or SFP+ ports
4
42 44 42 44
41 43
42
41 43 41 43

16 Arista Networks Copyright2013
Chapter 5: Configuring the Modular Switch
Chapter 5 Configuring the Modular Switch
Arista switches ship from the factory in Zero Touch Provisioning (ZTP) mode. ZTP configures the switch
without user intervention by downloading a startup configuration file or a boot script from a location
specified by a DHCP server. To manually configure a switch, ZTP is bypassed. The initial configuration
provides one username (admin) accessible only through the console port because it has no password.
When bypassing ZTP, initial switch access requires logging in as admin, with no password, through the
console port. Then you can configure an admin password and other password protected usernames.
This manual configuration procedure cancels ZTP mode, logs into the switch, assigns a password to
admin, assigns an IP address to the management port, and defines a default route to a network gateway.
Step 1 Provide power to the switch (Section 4.2).
Step 2 Connect the console port to a PC (Section 4.3).
As the switch boots without a startup-config file, it displays this message through the console:
The device is in Zero Touch Provisioning mode and is attempting to
download the startup-config from a remote system. The device will not
be fully functional until either a valid startup-config is downloaded
from a remote system or Zero Touch Provisioning is cancelled. To cancel
Zero Touch Provisioning, login as admin and type 'zerotouch cancel'
at the CLI.
localhost login:
Step 3 Log into the switch by typing admin at the login prompt.
localhost login:admin
Step 4 Cancel ZTP mode by typing zerotouch cancel. IMPORTANT: This step initiates a switch reboot.
localhost>zerotouch cancel
Step 5 After the switch boots, log into the switch again by typing admin at the login prompt.
Arista EOS
localhost login:admin
Last login: Fri Mar 15 13:17:13 on console
Step 6 Enter global configuration mode.
localhost>enable
localhost#config
Step 7 Assign a password to the admin username with the username secret command.
localhost(config)#username admin secret pxq123
Step 8 Configure a default route to the network gateway.
localhost(config)#ip route 0.0.0.0/0 192.0.2.1
Step 9 Assign an IP address (192.0.2.8/24 in this example) to an Ethernet management port.
localhost(config)#interface management 1/1
localhost(config-if-Ma1/1)#ip address 192.0.2.8/24
Step 10 Save the configuration by typing write memory or copy running-config startup-config.
localhost#copy running-config startup-config
When the management port IP address is configured, use this command to access the switch from a
host, using the address configured in step 9:
ssh [email protected]
Refer to the Arista Networks User Manual for complete switch configuration information.

Appendix A: Status Indicators
Modular Switch Quick Start Guide PDOC-00015-04 17
Appendix A Status Indicators
This appendix describes modular switch modules and interprets the LEDs on each module.
A.1 Supervisor Module
While the front panel of each switch can house two supervisors, switch operations require only one.
Supervisors display switch component status and contain Ethernet management and console ports.
Appendix D displays the supervisor location on each switch.
The following sections describe each supervisor model.
A.1.1 Supervisor-1
Supervisor-1 provides a serial console port, an Ethernet management port, and a USB port. Supervisor
activity is reported by LEDs in the upper left quadrant. The Status Summary Screen in the center reports
status for other components. Figure 17 depicts the Supervisor-1 module.
Supervisor Activity Status
The Status and Active LEDs report supervisor activity status. Table 2 interprets the states of both LEDs.
Component Activity Status
The Status Summary Screen displays indicators for the power supplies, fabric module, fan modules, and
linecards. Table 3 interprets the states of the indicators that the screen displays.
Figure 17: Supervisor-1 Module
Table 2: Supervisor-1 Activity LED States
LED Name LED State Supervisor State
Status LED
Off Module failed or is improperly inserted.
Green Supervisor operating normally.
Red Module failed.
Active LED Off Supervisor is not active.
Green Supervisor is active and controlling the switch.
Table 3: Supervisor-1 Status Summary Screen LED States
LED State Status
Gray Module not present or improperly inserted.
Green Module operating normally.
Red Module has failed.

18 Arista Networks Copyright2013
Appendix A: Status Indicators
A.1.2 Supervisor-E
Supervisor-E provides one serial console port, two Ethernet management ports, two USB ports, and one
clock input port. Supervisor activity is reported by LEDs in the upper left corner. Four LEDs located left
of the ports report status of other switch components. Figure 18 displays the Supervisor-E module.
Supervisor Activity Status LEDs
The Status and Active LEDs are located on the left side of the Supervisor-E module. Table 4 interprets
the states of these two LEDs.
Component Activity Status LEDs
LEDs located below the vents and left of the input ports display summary indicators for power supplies,
fabric modules, fan modules, and linecards. Table 5 interprets the states of these indicators. When error
conditions are indicated, refer to LEDs on the specified modules to determine the condition’s source.
Figure 18: Supervisor-E Module
Table 4: Supervisor-E Activity LED States
LED Name LED State Supervisor State
Status LED
Off Module failed or is improperly inserted.
Green Supervisor operating normally.
Blinking Green Supervisor booting.
Red Module failed.
Active LED Off Supervisor is not active.
Green Supervisor is active and controlling the switch.
Table 5: Supervisor-E Component Activity LED States
LED Name LED State Module State
Power Supply,
Line Card
Fabric Module
Off No modules are present or powered.
Green All powered modules are operating normally.
Red At least one module has failed.
Fan Modules
Amber At least one fan is missing or has failed.
Green All modules are operating normally.
Red There are insufficient functional fans installed in the switch.

Appendix A: Status Indicators
Modular Switch Quick Start Guide PDOC-00015-04 19
A.2 Linecard Module Indicators
Each linecard module provides one status LED plus LEDs for each port on the card. The figures in
Appendix F indicate the location of the LEDs on each linecard. Figure 19 displays the status LED and
Port LEDs on the left side of the DC-7548S-LC linecard.
The Linecard Status LED is in the top left corner of the DC-7548S-LC linecard. Table 6 interprets the
states of the Status LED.
The linecard provides an LED for each port socket. Table 7 interprets the port LED states.
Figure 19: Linecard Status LED
Table 6: Linecard Status LED States
LED State Status
Off Linecard not inserted.
Green Linecard operating normally.
Yellow Linecard administratively shut down.
Red Module has failed.
Table 7: Linecard Port LED States
LED State Status
Off Port link is down.
Green Port link is up.
Yellow Port is disabled in software.

20 Arista Networks Copyright2013
Appendix A: Status Indicators
A.3 Fan and Fabric Status Indicators
Fan and Fabric Status LEDs are on fan modules (DCS-7508-FAN) or fan-fabric modules (DCS-7504-FM,
DCS-7504E-FM, DCS-7508E-FM). Appendix E displays the location of these LEDs on each switch.
Figure 20 displays Fan Status and Fabric Status LEDs on DCS-7508-FAN and DCS-7504-FM modules.
Table 8 interprets the states of the Fan and Fabric Status LEDs.
A.4 Power Supply Status Indicators
Power Supply LEDs are on power supply modules. Appendix E displays the position of these LEDs on
the rear of each switch. Figure 21 display a power supply module.
Table 9 interprets the states of the Power Supply Status LED.
Figure 20: Fan Status and Fabric Status LEDs
Table 8: Fan Status and Fabric Status LED States
LED State Status
Off Module inserted, but status is unknown.
Green Module operating normally
Red Module failed
Figure 21: Power Supply
Table 9: Power Supply Status
OK LED Fault LED Status
Green Off Power Supply operating normally.
Off Yellow No AC power on this supply.
Off Red Module has failed.
Off Off No AC power on any supply.