Arista 7800 Series User manual

Quick Start Guide
7800 Series Modular
Data Center Switch
Arista Networks
www.arista.com
DOC-04133-01

ii 24 February 2020Quick Start Guide: 7800 Series Modular Switches
© Copyright 2020 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
5453 Great America Parkway
Santa Clara, CA 95054
USA
[phone]
www.arista.com
Support
[phone]
[phone]
[email protected]
Sales
[phone]
[phone]
[email protected]

Quick Start Guide: 7800 Series Modular Switches 24 February 2020iii
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.......................................................................................................................................... 3
Chapter 2 Preparation.........................................................................................................5
2.1 Site Selection.......................................................................................................................................... 5
2.2 Tools and Parts Required for Installation................................................................................................ 7
2.3 Electrostatic Discharge (ESD) Precautions ............................................................................................ 7
Chapter 3 Rack Mounting the Switch ................................................................................9
3.1 7808 Rack Mounting............................................................................................................................... 9
3.1.1 Inserting and securing the cradle assembly............................................................................... 9
3.1.2 Inserting the Switch into the Rack............................................................................................ 13
Chapter 4 Cabling the Modular Switch............................................................................15
4.1 Cabling the Power Supplies.................................................................................................................. 15
4.2 Cabling Chassis Ground....................................................................................................................... 16
4.3 Cabling the AC Power Supplies............................................................................................................ 17
4.4 Cabling the DC Power Supply .............................................................................................................. 18
4.4.1 DC Power Supplies.................................................................................................................. 18
4.4.2 Wire and Lug Preparation........................................................................................................ 18
4.5 Power Supply Specifications ................................................................................................................ 18
4.6 Power Supply Configurations ............................................................................................................... 19
4.6.1 Recommendations for power supply usage............................................................................. 19
4.7 Power Supply Redundancy .................................................................................................................. 19
4.8 Connecting Supervisor Cables ............................................................................................................. 20
4.9 Connecting Line Card Modules and Cables ......................................................................................... 23
Chapter 5 Configuring the Modular Switch ....................................................................25
Appendix A Status Indicators...........................................................................................27

iv 24 February 2020Quick Start Guide: 7800 Series Modular Switches
A.1 Supervisor Module................................................................................................................................ 27
A.1.1 System Level Status Indicator LEDs: 7800-SUP-D ................................................................. 27
A.2 Line Card Module Indicators................................................................................................................. 29
A.3 Fabric Module Status Indicators ........................................................................................................... 30
A.4 Power Supply Status Indicators............................................................................................................ 31
Appendix B Parts List........................................................................................................35
B.1 Parts Used in All Rack Mount Configurations....................................................................................... 36
B.1.1 Cables...................................................................................................................................... 36
B.1.2 Getting-Started Booklet............................................................................................................ 36
B.2 Four-Post Rack Mount Parts ................................................................................................................ 36
Appendix C Front Panel ....................................................................................................37
Appendix D Rear Panel .....................................................................................................39
Appendix E Line Cards .....................................................................................................41
Appendix F Maintenance and Field Replacement ..........................................................43
F.1 Power Supplies..................................................................................................................................... 43
F.1.1 Removing AC Power Supply.................................................................................................... 43
F.1.2 Removing DC Power Supply ................................................................................................... 44
F.1.3 Removing Power Supply Blank................................................................................................ 44
F.1.4 Installing AC Power Supply...................................................................................................... 44
F.1.5 Installing DC Power Supply ..................................................................................................... 44
F.2 Fabric and Fan Module (Fabric Module)............................................................................................... 45
F.2.1 Removing Fabric Module......................................................................................................... 45
F.2.2 Installing Fabric Module........................................................................................................... 45
F.3 Supervisor Module................................................................................................................................ 46
F.3.1 Removing Supervisor Module.................................................................................................. 46
F.3.2 Removing Supervisor Module Blank........................................................................................ 46
F.3.3 Installing Supervisor Module.................................................................................................... 46
F.4 Linecards .............................................................................................................................................. 46
F.4.1 Removing Linecard .................................................................................................................. 46
F.4.2 Removing Linecard Blank ........................................................................................................ 47
F.4.3 Installing Linecard.................................................................................................................... 47
Appendix G Regulatory Model Numbers .........................................................................49
Appendix H Taiwan RoHS Information ............................................................................51

Quick Start Guide: 7800 Series Modular 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-7808
Important! Only qualified personnel should install, service, or replace this equipment.
Seul le personnel qualifié doit installer, service, ou remplacer cet équipement.
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 7800 Series Modular Switches purchase order. Appendix B 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 (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).
Step 5 Configure the switch (Chapter 5).

2Quick Start Guide: 7800 Series Modular 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 60825, 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.
Produit Laser de classe 1: Ce produit a des dispositions pour installer des émetteurs-récepteurs de
laser de classe 1 qui offre de couplage au réseau de communication optique.Une fois un produit laser
de classe 1 est installé, l'équipement est un produit Laser de classe 1 (Appareil à Laser de Classe 1).Le
client est responsable pour sélectionner et installer l'émetteur/récepteur de laser de classe 1 et pour
assurer que la classe 1 AEL (limite d'émission admissible) par EN/IEC 60825, CSA E60825-1, et Code
des règlements fédéraux 21 CFR 1040 ne soit pas dépassée après avoir installé l'émetteur/récepteur
de laser. Ne pas installer des appareils à laser dont la cote de classe est supérieure à 1.Voir toutes les
consignes de sécurité qui ont accompagné l'émetteur-récepteur avant l'installation. Seuls appareils
laser de classe 1 certifiés pour une utilisation dans le pays d’installation par l’organisme compétent
doivent être utilisées dans ce produit.
Important! Ultimate disposal of this product should be handled in accordance with all national laws and
regulations.
Aucune pièce réparable par l'utilisateur à l'intérieur. Confiez toute réparation à un technicien qualifié.
1.4 Safety Information
Refer to the Arista Networks document Safety Information and Translated Safety Warnings available at:
https://www.arista.com/en/support/product-documentation
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: https://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 [phone].
Important! No user serviceable parts inside. Refer all servicing to qualified service personnel.
Aucune pièce réparable par l'utilisateur à l'intérieur. Confiez toute réparation à un technicien qualifié.

Chapter 1: Overview Specifications
Quick Start Guide: 7800 Series Modular Switches 3
1.6 Specifications
Table 1-1 lists the specifications of Arista Data Center modular switches covered by this guide.
1. For non-redundant power feeds, 16 to 24 for redundant power feeds.
Table 1-1 Modular switch specifications
DCS-7808
Height 16RU: 702 mm (27.64
inches)
Width 441 mm (17.36 inches)
maximum
Depth 940 mm (37.01 inches)
Weight 338.6 kg (745 lbs) fully
loaded
DC Input (per PSU) 2x -48 to -60 V DC
70 A to 55 A
DC Branch Circuit
Protection
2x 90 A
AC Input Voltage
(per PSU)
2x 200-240 V
AC Branch Circuit
Protection
2x 20 A
Input Power Circuits 8 to 12 circuits(1)
Ambient
Temperature
Storage Temperature
Relative Humidity
Altitude
0° to 40°C (32° to
104°F)
-40° to 70°C
(-40° to 158°F)
5 to 90%
0 to 3,000 meters
(0 to 10,000 feet)
Cooling See Power draw
configurations in
Table 1-2

4Quick Start Guide: 7800 Series Modular Switches
Specifications Chapter 1: Overview
Table 1-2.lists power specifications of modular switch components.
1. With no input power.
Note1: Includes typical power supply conversion inefficiency. Contact your local Sales Engineer for
7800 power calculator details.
Note2: Power numbers given as Typical/Maximum or Typical/Hot/Maximum where Hot is defined as
40°C Sea Level.
* Not N+N redundant power at worst case Temp/Elevation.
Table 1-2 7800 Series power specifications
Module Type Part Number Power Draw (Typical / Maximum)
Supervisor Modules DCS-7808-SUP-D 125 W / 152 W
Line Card Modules DCS-7800R3-48CQ-LC
DCS-7800R3K-48CQ-LC
DCS-7800R3-48CQM-LC
DCS-7800R3-36P-LC
398 W / 462 W
398 W / 462 W
620 W / 684 W
807 W / 1083 W
Fabric Modules DCS-7808-FM 438 W / 693 W
Power Supply (AC) PWR-D1-3041-AC-BLUE 3 W / 10 W(1)
Power Supply (DC) PWR-D2-3041-DC-BLUE 3 W / 10 W(1)
7808 Series System Full chassis loaded with
2 DCS-7808-SUP-D
6 DCS-7808-FM
8 DCS-7800R3-48CQ-LC
8 PWR-D1-3041-AC-BLUE
6390 W / 8540 W

Quick Start Guide: 7800 Series Modular Switches 5
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 the dimensions and footprint of the switch clearance requirements for the
switches.
Figure 2-1: Clearance requirements and footprint for switches
Table 2-1 shows the dimensions for each of the modular switches.
Note The PSU removal clearance (Front) is 62.5 cm (24.6 in.)
Table 2-1 Clearance requirements and footprint dimensions
Switch Clearance Requirements Dimensions
A B C
DCS-7808 38.4 cm (15.1 in.) 102.1 cm (40.2 in.) 58.9 cm (23.2 in.)

6Quick Start Guide: 7800 Series Modular Switches
Site Selection Chapter 2: Preparation
•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).
Pour empêcher l'interrupteur de surchauffe, ne pas utiliser il dans une zone où la température ambiante
est supérieure à 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 Requirements: Table 2-2 shows the rack space requirements for each of the modular
switches.
Note The accessory kit provides the required mounting hardware for each switch.
•Power Requirements: Arista switches require a minimum number of operating power supplies in
all chassis, AC or DC, and for each power domain of switches with multiple power domains. Refer
to Chapter 4 for more details regarding your switch.
Important! DC cables should be protected with circuit over-current protection devices and circuit disconnect
means. To power off a unit, power must be disconnected from ALL power cables.
DC câbles doivent être protégés avec dispositifs de protection de surintensité circuit et moyens de
déconnexion du circuit. Pour alimenter un appareil hors tension, l'alimentation doit être débranchée de
tous les câbles d'alimentation.
•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 input connectors.
• DC power cables can reach from the DC power distribution unit to the input connectors.
Table 2-2 Rack space requirements
Switch
Rack or cabinet (standard 19" EIA)
2-post 4-post
Switch Height
(RU)
DCS-7808 No Yes 16

Chapter 2: Preparation Tools and Parts Required for Installation
Quick Start Guide: 7800 Series Modular Switches 7
2.2 Tools and Parts Required for Installation
The following tools are required to install a modular switch:
• Mechanical device capable of lifting chassis being installed (Table 1-1 on page 3).
• Torque reading nut driver (for DC power supplies)
• #2 Phillips head screwdriver
Rack mount: Table 2-3 shows the rack components required for each of the modular switches.
1 The accessory kit includes screws that fit many common equipment racks.
2 Rack nuts are only for racks with unthreaded, rack-post holes.
3 These are in addition to the rack-mount kit screws required for the cradle.
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 anti-static 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.
Table 2-3 Rack component requirements
Switch Rack or cabinet (standard 19" EIA)
Rack screws(1) Rack nuts(2) Notes
DCS-7808 9(3) 9(3) 4-post installation

8Quick Start Guide: 7800 Series Modular Switches
Electrostatic Discharge (ESD) Precautions Chapter 2: Preparation

Quick Start Guide: 7800 Series Modular Switches 9
Chapter 3
Rack Mounting the Switch
3.1 7808 Rack Mounting
The accessory kit provides components for installing the switch in four-post racks. The accessory kit
includes the following four-post mounting parts:
• Cradle assembly
• Twelve M6 pan-head Phillips screws
• Twelve M6 rack cage nuts (optional)
Note 2-post rack mount is not supported.
Illustrations in this chapter depict the mounting of an unpopulated 8-slot chassis.
After completing the instructions for your rack type, proceed to Chapter 4.
Rack mounting the switch in a 4-post rack requires the following tasks:
• Inserting and securing the cradle assembly into the rack (Section 3.1.1).
• Inserting the switch into the rack (Section 3.1.2).
3.1.1 Inserting and securing the cradle assembly
To insert and secure the cradle assembly to the rack use the following steps.
Step 1 Insert two screws loosely in the two front rack posts at the same level and two in the back two
rack posts 3 RU above the front screws (Figure 3-1).

10 Quick Start Guide: 7800 Series Modular Switches
7808 Rack Mounting Chapter 3: Rack Mounting the Switch
Figure 3-1: Attaching mounting screws to the rack posts
Step 2 Buckle the straps on the cradle together, prior to installation, so the left and right sides are
angled slightly inwards (Figure 3-2).
Figure 3-2: Buckling the straps
Step 3 Pull out the rear sliding rails slightly beyond the back rack posts.
Step 4 Insert the cradle so that the notches in the cradle engage behind the loosely mounted front
screws (Figure 3-3).
Step 5 Slide the rear sliding rails back in so that they are flush with the back rack posts, the notches
in the cradle engage behind the loosely mounted screws, and the bottom of the cradle is
horizontal and level (Figure 3-3).

Chapter 3: Rack Mounting the Switch 7808 Rack Mounting
Quick Start Guide: 7800 Series Modular Switches 11
Figure 3-3: Inserting the cradle
Step 6 Release the clasp on the connector to rotate the left and right sides so they are vertical.
(Figure 3-4).

12 Quick Start Guide: 7800 Series Modular Switches
7808 Rack Mounting Chapter 3: Rack Mounting the Switch
Figure 3-4: Aligning the cradle in the rack
Step 7 Secure the cradle to the rack posts using the eight remaining screws, two more in the front
and 6 more in the back for a total of twelve screws. (Figure 3-5).

Chapter 3: Rack Mounting the Switch 7808 Rack Mounting
Quick Start Guide: 7800 Series Modular Switches 13
Figure 3-5: Securing the cradle in the rack
3.1.2 Inserting the Switch into the Rack
The switch is mounted onto a four-post rack by assembling a rack-mount cradle into the rack
(Section 3.1.1), then placing the switch on the cradle and securing it to the rack.
Step 1 Move the chassis to the rack using a mechanical lift (Figure 3-6).
Note If modules are inserted in the chassis, use the lift carefully to avoid damaging any components.
Step 2 Lift the chassis into the rack.

14 Quick Start Guide: 7800 Series Modular Switches
7808 Rack Mounting Chapter 3: Rack Mounting the Switch
Figure 3-6: Lifting the chassis
Step 3 Secure the chassis by tightening additional M6 screws on the front flanges into the rack posts
(Figure 3-7).
Note Additional screws depend on the device. The 7808 chassis requires nine.
Figure 3-7: Secure the switch to the rack shelf
Step 4 After completing the Four-Post Installation, proceed to Chapter 4.

Quick Start Guide: 7800 Series Modular Switches 15
Chapter 4
Cabling the Modular Switch
4.1 Cabling the Power Supplies
Before you begin, refer to the Arista Networks document Compliance and Safety Guide available at:
https://www.arista.com/en/support/product-documentation.
Important! Power down the switch: Remove all power cords from the power inlets.
Mettez le commutateur: Retirez tous les cordons d'alimentation des prises d'alimentation.
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.
Installation de cet équipement doit être conformes aux codes électriques locaux et nationaux. Si
nécessaire, consulter les organismes de réglementation appropriés et des autorités de contrôle pour
assurer la conformité.
Note Many configurations will require additional power supplies.
Nombreuses configurations exigera des alimentations supplémentaires.
Important! All power supply slots must be filled with either a power supply or blank to ensure proper air flow.
Tous les emplacements d'approvisionnement de puissance doivent être remplis avec une alimentation
ou vide pour assurer un débit d'air appropriée.
Important! Read all installation instructions before connecting the system to the power source.
Lire toutes les instructions d'installation avant de brancher le système à la source d'alimentation.
The 7800 chassis requires the connection of at least eight operating power supplies to active circuits.
Each power supply includes a fan that maintains proper power supply temperature. The appendices
display the location of components for all switches described in this guide.

16 Quick Start Guide: 7800 Series Modular Switches
Cabling Chassis Ground Chapter 4: Cabling the Modular Switch
4.2 Cabling Chassis Ground
Figure 4-1 displays the location of the chassis grounding locations on front panel of the switch chassis.
Chassis ground locations are also located on the rear panel of the switch chassis. After mounting the
switch into the rack, connect at least one of the chassis grounds to the data center ground. After the
switch is grounded, ESD wrist straps can be grounded by connecting them to one of the attach points.
Important! Grounding wires and grounding lugs are not supplied.
Wire size should meet local and national installation requirements.
Commercially available 2 or 4 AWG wire is recommended for installations in the U.S.
À la terre et de mise à la terre fils cosses ne sont pas fournis.
Calibre des fils doit satisfaire des exigences de l'installation locale et nationale.
Disponible dans le commerce 2 ou 4 AWG fil est recommandé pour les installations aux États-Unis.
Important! This equipment must be grounded. Never defeat the ground conductor. This unit requires over-current
protection.
Cet équipement doit être mis à la terre. Ne jamais modifier le conducteur de terre. Cet appareil
nécessite de protection contre les surintensités.
Important! Secondary Grounding wires, lugs and screws (M4 x 0.7) are not supplied.
Secondaire à la terre, câbles, cosses et vis (M4 x 0.7) ne sont pas fournis.
Figure 4-1: Chassis ground locations