Taiwan RoHS Information
This appendix provides Taiwan RoHS information for switches covered by this guide.
For Taiwan BSMI RoHS Table, go to https://www.arista.com/assets/data/pdf/AristaBSMIRoHS.pdf.

Regulatory Model Numbers
This appendix lists the regulatory model numbers (RMNs), where applicable, for the product models for the switches described in this document.
 
Table F-1 Regulatory Model Numbers and Product Numbers
Regulatory Model Number (RMN)
Product Number(s)
AN1606
DCS-7020TR-48, DCS-7020TRA-48
AN1624
DCS-7020SR-24C2, DCS-7020SRG-24C2
 
 
 
 
 

Maintenance and Field Replacement
E.1 Considerations
• All fans and power supplies are hot swappable.
• The switch can be running while a power supply is being installed or removed, but the power supply being replaced must not be connected to a power source.
• All slots must be filled or covered with a blank for operation (even though power supply or fans may not be functional).
• Before you begin, refer to the Arista Networks document Safety Information and Translated Safety Warnings available at: http://www.arista.com/support/docs/eos.
Note Descriptions for the removal and replacement of power supplies and fans are for a representative power supply or fan. Locations of status indicator LEDs may differ. Refer to the front and rear panel illustrations of your device to locate the appropriate LED.
E.2 Power Supplies
The following steps are required when removing power supplies from a switch.
E.2.1 Removing a Power Supply
Step 1 Ground yourself with an ESD wrist strap.
Step 2 Power down the power supply to be removed by disconnecting the AC power cable.
Step 3 Push the power supply release lever and remove the power supply ( Figure E-1).
Figure E-1: Remove power supply
E.2.2 Installing a Power Supply
You must make space for installing the power supply by removing an existing one ( Section E.2.1).
Step 1 Remove the replacement power supply from its packaging.
Step 2 Slide the new power supply into the empty slot.
Figure E-2: Install power supply
Step 4 Connect the power cord to the power supply.
Step 5 Verify the LED(s) on the power supply.
Note The Power Supply status LED should be a steady green for normal operation.
Step 6 Verify the new power supply operation by issuing the show environment power command.
switch#show environment power
The output of the command will list the power supplies in operation and should include the one you replaced.
E.3 Fan Modules
Note Hot swap fans within 30 seconds to prevent the switch from overheating. Ensure that the module you are replacing matches those already installed in the switch.
E.3.1 Removing a Fan Module
The following steps are required when removing or replacing fans from a switch.
Step 1 Ground yourself with an ESD wrist strap.
Step 2 Push the fan module release lever and slide the fan module out of the switch ( Figure E-3).
Figure E-3: Removing fan module
E.3.2 Installing a Fan Module
You must make space for installing the fan module by removing an existing one ( Section E.3.1).
Step 1 Remove the replacement fan from its packaging.
Figure E-4: Inserting the fan module
 
Step 3 Verify that the fan module is working normally.
Note The fan module status LED should be a steady green for normal operation.
 
 

Rear Panel
All switches covered by this guide use the rear panels shown below. Depending on the installed power supply module, the appearance could be different from the one shown.
 
Figure D-1: Rear Panel for DCS-7020TR-48 and DCS-7020TRA-48
Figure D-2: Rear Panel for DCS-7020SR-24C2 and DCS-7020SRG-24C2
 

Front Panel
This appendix displays the front panel of all switches covered by this guide.
Figure C-1: DCS-7020TR-48
Figure C-2: DCS-7020TR-48
Figure C-3: DCS-7020SR-24C2 and DCS-7020SRG-24C2
 

Parts List
Each switch provides an accessory kit that contains parts that are required to install the switch. This appendix lists the installation parts contained in the switch accessory kit.
B.1 Rack Mount Parts
B.1.1 Four-Post Rack Mount Parts
Figure B-1: Four-Post Rack Mount Parts
B.1.2 Two-Post Rack Mount Parts
Figure B-2: Two-Post Rack Mount Parts
B.2 Cables
 
Quantity
Description
2
Power cables: IEC-320/C13-C14, 13 A, 250 V
1
RJ-45 Patch Panel Cable
1
RJ-45 to DB9 Adapter Cable
Warning All provided power cables are for use only with Arista products.

Status Indicators
A.1 Front Indicators
A.1.1 Switch Indicators
Front panel LEDs are located on the right side of the chassis and display system, fan, and power supply status.
Figure A-1 displays the front panel LEDs for a representative switch.
Figure A-1: System Status Indicators
 
Table A-1 Switch Indicators LED States (Front)
LED Name
LED State
Device Status
System Status LED
Blinking Green
System is powering up.
Green
Normal operations. Due to power supply and fan redundancy, this LED will remain green if a single fan or power supply is missing or in a failed state.
Blue
The locater function is active.
Amber
Two or more fans (any combination of fan modules or PSU fans) are disconnected or malfunctioning. The switch will automatically execute a “graceful shutdown” shortly.
Fan Status LED
Green
All fan and power modules are operating normally.
Amber
Single fan module is removed or malfunctioning. It is also amber when a PSU is completely removed or has a stuck fan rotor.
Red
Two or more fans (any combination of fan modules or PSU fans) are disconnected or malfunctioning. The switch will automatically execute a “graceful shutdown” shortly.
PSU [1:2] Status LED
Green
PSU is functioning and fully operational. AC is present, Aux output is ON, and Main output is ON.
Off
PSU has been removed or is not operating properly due to AC cord being unplugged, its fan rotor being stuck, or an internal fault.
A.1.2 Port Indicators
Port LEDs, located in the vicinity of their corresponding ports, provide link and operational status. Figure A-2 displays the Port LED location on the DCS-7050QX-32S switch.
Figure A-2: Port LEDs
Table A-2 provides status conditions that correspond to port LED states. Port LED behavior for QSFP+ and SFP+ ports is consistent.
Table A-2 Port LED States (Front)
LED State
Status
Off
Port link is down.
Green
Port link is up.
Yellow
Port is software disabled.
Flashing Yellow
Port failed diagnostics.
A.2 Rear Status Indicators
Fan and power supply modules are accessed from the rear panel. Each fan and power supply module contains an LED that reports the module status.
Fan Status LEDs are on the fan modules, as displayed in Figure A-3.
Figure A-3: Fan Status LED
Table A-3 provides status conditions that correspond to fan status LED states.
 
Table A-3 Fan Status LED States (Rear)
LED State
Status
Off
The fan module is not detected. If it is inserted, it may not be seated properly.
Green
The fan is operating normally. This LED state is exclusive to its fan module, and independent of the states of its neighboring fans and power supplies.
Red
The fan has failed.
The AC Power Supply Status LEDs are on the power supply modules, as displayed in Figure A-4.
Figure A-4: AC Power Supply Status LED
Table A-4 provides status conditions that correspond to the AC power supply status LED states.
Table A-4 AC Power Supply Status LED States (Rear)
Power Supply State
PWR-500AC-F
PWR-500AC-R
Input power present
Normal operation
Green
Input power present
Power Supply fault
Yellow
No Input power Supply installed in chassis
Off
Input power present Supply not installed in chassis
Green
The DC Power Supply Status LEDs are on the power supply modules, as displayed in Figure A-5.
Figure A-5: DC Power Supply Status LED
Table A-5 provides status conditions that correspond to the DC power supply status LED states.
Table A-5 DC Power Supply Status LED States (Rear)
Power Supply State
PWR-500DC-F
PWR-500DC-R
Input power present
Normal operation
Green
Input power present
Power Supply fault
Blinking Yellow
No Input power
Supply installed in chassis
Off
Input power present Supply not installed in chassis
Blinking Yellow
Note You can narrow down the error condition by logging in to the switch to view the specific device state. Refer to the Arista User Manual’s Switch Environment Control chapter, under the topic Viewing Environment Status, for further information on the show environment commands.
 

Configuring the 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 4.1).
Step 2 Connect the console port to a PC ( Section 4.2).
As the switch boots without a startup-config file, it displays the following 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
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 admin@192.0.2.8
Refer to the Arista Networks User Manual for complete switch configuration information.
 

Cabling the Switch
4.1 Grounding the Switch
After mounting the switch into the rack, connect the switch to the data center ground. Figure 4-1 displays the location of the grounding pads located on the rear panel for the DCS-7020TR-48 and DCS-7020TRA-48 models. Figure 4-2 displays the location of the grounding pads on the rear panel for the DCS-7020-SR-24C2 and DCS-7020-SRG-24C2 models. There are threaded holes under the sticker on the right (next to PS2) that warns about “1 min”.
Important! Grounding wires and grounding lugs (M4 x 0.7) are not supplied. Wire size should meet local and national installation requirements. Commercially available 6 AWG wire is recommended for installations in the U.S

À la terre et de mise à la terre fils cosses (M4 x 0.7) ne sont pas fournis. Calibre des fils doit satisfaire des exigences de l’installation locale et nationale. Disponible dans le commerce 6 fils AWG est recommandé pour les installations aux États-Unis.
 
Figure 4-1: Earth Grounding Pad Sockets for DCS-7020TR-48 and DCS-7020TRA-48
 
Figure 4-2: Earth Grounding Pad Sockets for DCS-7020SR-24C2 and DCS-7020SRG-24C2
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.

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.
The switch operates with two installed power supplies. At least one power supply must connect to a power source. Two circuits provide redundancy protection. Appendix D displays the location of the power supplies on the rear panel of the switch.
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.
• Non-Redundant Configuration: Connect power to either of the two power supplies.
• Redundant Power Supply Configuration: Connect power to both power supplies.
• Power down the Switch: Remove all power cords and wires from the power supplies.
Important! This equipment must be grounded. Never defeat the ground conductor.

Cet équipement doit être mis à la terre. Ne jamais modifier le conducteur de terre.
Important! This unit requires overcurrent protection.

Cet appareil requiert une protection contre les surintensités.
4.2.1 AC Power Supplies
The following AC power supplies are supported.
• PWR-500AC
Figure 4-3 displays an AC power supply, including the power socket on the left side of the module. The AC power supply connects to a circuit that provides the required power, as specified by Table 1-4.
Figure 4-3: AC Power Supply
The power supplies require power cables that comply with IEC-320 and have a C13 plug. The accessory kit provides two IEC-320 C13 to C14 power cables.
4.2.2 DC Power Supplies
The following DC power supplies are supported.
• PWR-500-DC
Figure 4-4: Supported DC power supplies
Important! A disconnect device must be provided as part of the installation .

Un dispositif de sectionnement doit être fourni dans le cadre de l'installation.
Important! Ensure power is removed from DC circuits before performing any installation actions. Locate the disconnect device, circuit breakers or fuses on DC power lines servicing the circuits.
Turn off the power line circuits or remove the fuses.

Pouvoir assurer qu'il est retiré de circuits DC avant d'effectuer des actions d'installation . Localiser les disjoncteurs ou des fusibles sur les lignes de courant continu desservant les circuits.
Coupez les circuits de lignes d'alimentation ou retirer les fusibles.
Important! Wire size must comply with local and national requirements and electrical codes.
Use only copper wire.

Le calibre du fil doit être conforme aux exigences locales et nationales et les codes électriques.
Utiliser du fil de cuivre.
Important! Apply ground connection to the switch first during installation and remove last when removing power.

Appliquer connexion à la terre à l'interrupteur premier lors de l'installation et de supprimer la dernière alimentation lors du débranchement.
4.2.3 Connecting the PWR-500-DC Power Supply
The PWR-500W-DC power supply connects to a circuit that provides -48Vto -60V and 15A. Ensure the wires connecting the DC power supply to the power source meet the following:
• DC Input Wire Size: AWG 14 (2.0 mm2) or larger as appropriate
• Safety Ground Wire Size: AWG 14 (2.0 mm2) or larger as appropriate
• Wire Terminal (Lug): ring or spade/fork, 14-16 AWG, #8 (4 mm) screw
• Over-current protection: 20 A.
Important! Ensure power is removed from DC circuits before performing any installation actions. Locate circuit breakers or fuses on DC power lines servicing the circuits. Turn off the power line circuits or remove the fuses.

Assurez-vous de pouvoir retirer des circuits en courant continu avant d’effectuer toute action d’installation.Localiser les disjoncteurs ou fusibles sur les lignes électriques DC entretien des circuits. Mettez hors tension le circuit ligne ou retirer les fusibles.
To connect a DC power supply to power source:
Step 1 Remove the terminal cover to expose the connectors on the terminal block on the face.
Step 2 Attach the appropriate lugs to the source DC wires.
Use DC cables with either insulated crimp-on spade lugs or insulated crimp-on ring connectors.
Important! Wire size must comply with local and national requirements and electrical codes. Use only copper wire.

Calibre doit respecter les exigences locales et nationales et les codes de l’électricité. Utiliser seulement du fil de cuivre.
Step 3 Connect the DC-input wires to the terminal block in this order:
1. Ground cable to the ground connector on the face of the power supply.
2. Negative (–) source DC cable to the negative (–) connector on the terminal block.
3. Positive (+) source DC cable to the positive (+) connector on the terminal block.
4. Torque the screws to 1.0 N·m / 9 in·lb.
Important! Apply the ground connection first during installation and remove last when removing power.

Appliquer le motif connexion tout d’abord pendant l’installation et supprimer dernière lors du retrait de puissance.
5. Replace the terminal cover.
4.3 Connecting Serial and Management Cables
The accessory kit includes the following cables:
• RJ-45 to DB-9 serial adapter cable.
• RJ-45 Ethernet cable.
Table 4-1 lists the pin connections of the RJ-45 to DB-9 adapter cable.
Table 4-1 RJ-45 to DB-9 Connections
RJ-45
DB-9
  
RJ-45
DB-9
RTS
1
8
CTS
  
GND
5
5
GND
DTR
2
6
DSR
  
RXD
6
3
TXD
TXD
3
2
RXD
  
DSR
7
4
DTR
GND
4
5
GND
  
CTS
8
7
RTS
Note RJ-45 to DB-9 connections: Models with management ports on the rear panel short RJ-45 pin 1 (RTS) to RJ-45 pin 8 (CTS). RJ-45 pins 2 (DTR) and RJ-45 pin 7 (DSR) are not electrically connected to anything.
For most models, the front panel contains the console, management, and USB ports. Figure 4-5 displays the ports on the front panel of the DCS-7050QX-32S switch. Figure 4-6 displays the ports on rear panel of the DCS-7280SR-48C6 switch. Appendix C and Appendix D display the front and rear panels of all switches covered by this guide.
Figure 4-5: Front Panel Ports
 
Figure 4-6: Rear Panel Ports
Connect the front or rear panel ports as follows:
• Console (Serial) Port: Connect to a PC with the RJ-45 to DB-9 serial adapter cable.
The switch uses the following default settings:
• 9600 baud
• No flow control
• 1 stop bit
• No parity bits
• 8 data bits
• Ethernet Management Port: Connect to 10/100/1000 management network with RJ-45 Ethernet cable.
• USB Port: The USB port may be used for software or configuration updates.
Caution Excessive bending can damage interface cables, especially optical cables.

Flexion excessive peut endommager les câbles d’interface, notamment des câbles optiques.
 

Rack Mounting the Switch
Important! The rack mounting procedure is identical for all switches covered by this guide. Illustrations in this chapter depict the mounting of a DCS-7050QX-32S switch.

Les procédure de montage du bâti est identique pour tous les commutateurs visés par ce guide. Illustrations dans ce chapitre montrent le montage d’un interrupteur de DCS-7050QX-32S.
• 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 onto a two-post rack, assemble the mounting brackets to the chassis, then attach the brackets to the rack posts. Two-post accessory kits include the following two-post mounting parts:
• 2 three-hole mounting brackets
Each chassis side has attachment pins that align with bracket holes. Pin orientation is symmetric and equidistant, supporting bracket placements where the flange is flush with the front switch panel, flush with the rear panel, or not flush with either panel. Each bracket hole includes a key-opening for placing the bracket flush with the chassis and then locking it into place.
Important! Attachment pins must engage all three upper bracket holes.

Goupilles de fixation doivent être bloquer tous les trois trous de la bride supérieure..
Figure 3-1 displays proper bracket mount configuration examples. Figure 3-2 displays improper bracket mount configuration examples.
3.1.1 Attaching Mounting Brackets to the Chassis
This procedure attaches mounting brackets to the switch chassis ( Figure 3-3).
Step 1 Align the mounting brackets with the attachment pins to obtain the desired mounting position.
Step 2 Place the bracket flush on the chassis with attachment pins protruding through key-openings.
Figure 3-1: Bracket Mount Examples for Two-Post Rack Mount
 
Figure 3-2: Improper Bracket Mount Examples for Two-Post Rack Mount
Step 3 Slide the bracket toward the front flange until the bracket clip locks with an audible click.
 
Figure 3-3: Attaching the Mounting Brackets to the Switch Chassis
To remove the mounting bracket from the chassis, lift the front edge of the mounting bracket clip with a flathead screwdriver and slide the bracket away from the front flange (opposite from the installation direction).
3.1.2 Inserting the Switch into the Rack
This procedure attaches the switch to the rack ( Figure 3-4).
Step 1 Lift the chassis into the rack. Position the flanges against the rack posts.
Step 2 Select mounting screws that fit your equipment rack.
Step 3 Attach the bracket flanges to the rack posts.
Figure 3-4: Inserting the Switch into the Rack
After completing the two-post rack mount, proceed to Chapter 4.
3.2 Four-Post Rack Mount
The switch is mounted onto a four-post rack by assembling two rails onto the rear posts, sliding the switch onto the rails, then securing the switch to the front posts.
The installation kit provides the following four-post mounting parts:
• 2 six-hole mounting brackets
• 2 rail-rods
• 2 rail-slides
The rail-rods and rail-slides assemble into two identical slide-rails.
Each chassis side has attachment pins that align with bracket holes. Pin orientation is symmetric and equidistant, supporting bracket placements where the flange is flush with the front switch panel, flush with the rear panel, or not flush with either panel. Each bracket hole includes a key-opening for placing the bracket flush with the chassis and then locking it into place.
Important! Attachment pins must engage at least five of the six bracket holes.

Goupilles de fixation doivent être lock au moins cinq des trous du six support.
Figure 3-5 displays proper bracket mount configuration examples. Figure 3-6 displays an improper bracket mount configuration example.
Figure 3-5: Bracket Mount Examples for Four-Post Rack Mount
 
Figure 3-6: Improper Bracket Mount Example for Four-Post Rack Mount
3.2.1 Attaching Mounting Brackets to the Chassis
Figure 3-7 displays the front bracket alignment for mounting the switch into a four-post rack.
Figure 3-7: Attaching the Mounting Brackets to the Switch Chassis
This procedure attaches mounting brackets to the switch chassis as depicted by Figure 3-7.
Step 1 Align the mounting brackets with the attachment pins to obtain the desired mounting position.
Step 2 Place the bracket flush on the chassis with attachment pins protruding through key-openings.
Step 3 Slide the bracket toward the front flange until the bracket clip locks with an audible click.
To remove the mounting bracket from the chassis, lift the front edge of the mounting bracket clip with a flathead screwdriver and slide the bracket away from the front flange (opposite from the installation direction).
3.2.2 Assembling the Rails onto the Equipment Rack
Rail-rods and rail-slides assemble into two identical rails. Each rail connects a front post to a rear post. When the rails are installed, the switch slides on the rails into the rack. Each bracket includes a screw that attaches the switch to the rail.
Each end of an assembled rail contains two rack plugs ( Figure 3-8). The rails are installed into a rack by inserting the plugs into rack slots. When installing rails into posts with threaded or rounded holes, remove all plugs located on both sides of the assembled rails, then install the rails with bolts that fit the rack.
Figure 3-8: Attaching the Mounting Brackets to the Switch Chassis
This procedure attaches the rails to a four post rack:
Step 1 Slide a rail-rod into a rail-slide ( Figure 3-9) until the rail clip makes an audible click.
The rail clip prevents the extension of the rail beyond the maximum supported distance between the front and rear rack posts.
Figure 3-9: Assembling the Rails
Step 2 Attach rail to the right rear rack post by inserting rod-end rack plugs into post slots ( Figure 3-10, Inset A). The slide assembly must be inside the right posts, relative to the left rack posts.
If the rack plugs were previously removed, use bolts to attach the rail to the rack.
Step 3 Attach the slide end of the rail to the front post by extending the rail end past the post, then contracting the rail while guiding the rack plugs into the post ( Figure 3-10, Inset B).
Step 4 Repeat step 1 through step 3 for the left posts. Ensure the rails are on the same horizontal level.
Figure 3-10: Attaching the Rails
3.2.3 Attaching the Switch to the Rack
After the rails are installed, the switch slides on the rails into the rack. Each bracket includes a thumb screw that attaches the switch to the rail.
Step 1 Lift the switch into the rack and insert the mounting brackets into the slide rails.
Figure 3-11: Inserting the Switch onto the Rails
Step 2 Slide the switch on the rails, toward the rear posts, until the mounting bracket flanges are flush with the rail flanges attached to the rack posts.
Step 3 Attach the bracket flanges to the rack post using the quick-release thumb screws supplied with the brackets ( Figure 3-12).
Figure 3-12: Attaching the Switch to the Rack Posts
After completing the four-post rack mount, proceed to Chapter 4.