Quick Start Guide
7280CR2x-30 Series 1 RU
Data Center Switches
Arista Networks

www.arista.com

DOC-00136-06

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© Copyright 2025 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.

Regulatory Model Numbers

This section lists the Regulatory Model Numbers (RMNs), where applicable, for the product models for the switches described in this document.

Table 1. Regulatory Model Numbers and Product Numbers
Regulatory Model Number (RMN) Product Number(s)
AN1620 DCS-7280CR2A-30

DCS-7280CR2K-30
AN1711 DCS-7280CR2M-30

Maintenance and Field Replacement

This section discusses the following topics:

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 the power supply or fans may not be functional).
  • Before you begin, refer to the Arista Networks document Safety Information and Translated Safety Warnings at https://www.arista.com/en/support/product-documentation.

     

    Note: Descriptions for removing and replacing power supplies and fans are for a representative power supply or fan. Locations of status indicator LEDs may differ. Refer to your device's front and rear panel illustrations to locate the appropriate LED.

     

Power Supplies

The following steps are required when removing power supplies from a switch.

Removing a Power Supply

  1. Ground yourself with an ESD wrist strap.
  2. Power down the power supply, which will be removed by disconnecting the AC power cable.
  3. Push the power supply release lever and remove the power supply (Figure 1).
    Figure 1. Remove Power Supply


     

     


     

Installing a Power Supply

You must make space for installing the power supply by removing an existing one (Removing a Power Supply).
  1. Remove the replacement power supply from its packaging.
  2. Slide the new power supply into the empty slot.
  3. Slide the new power supply into the switch until the power supply is fully seated, and the release lever snaps into place (Installing a Power Supply).
    Figure 2. Install Power Supply

     

  4. Connect the power cord to the power supply.
  5. Verify the LED(s) on the power supply.
    Note: The Power Supply status LED should be a steady green for normal operation.

     

  6. Verify the new power supply operation by issuing the show environment power command. 
    switch# show environment power

     

    The command output will list the power supplies in operation and should include the one you replaced.

Fan Modules

Note: Hot-swap fans should be used within 30 seconds to prevent the switch from overheating. Ensure that the module you replace matches those already installed in the switch.

 

Removing a Fan Module

The following steps are required when removing or replacing fans from a switch.
  1. Ground yourself with an ESD wrist strap.
  2. Push the fan module release lever and slide the fan module out of the switch (Removing a Fan Module).
    Figure 3. Removing Fan Module

    1 Release Lever

     

Installing a Fan Module

You must make space for installing the fan module by removing an existing one (Removing a Fan Module).
  1. Remove the replacement fan from its packaging.
  2. Slide the new fan module into the switch until the module is fully seated, and the release lever snaps into place (Installing a Fan Module).
    Figure 4. Inserting the Fan Module

     

    Note: The fan module status LED should be a steady green for normal operation.

     

  3. Verify that the fan module is working normally.

Front Panel

This section displays the front panel of all switches covered by this guide.

Figure 1. DCS-7280CR2A-30, DCS-7280CR2K-30, and DCS-7280CR2M-30
1 System status LED 3 Power supply 1 status LED
2 Fan tray status LED 4 Power supply 2 status LED

 

Rear Panel

All switches covered by this guide use the rear panel shown below. Depending on the power supply module installed, the appearance could be different from the one shown.

Figure 1. Rear Panel

1 Power Supply Module 1 4 Fan Module 2 7 Fan Module 5
2 Management Ports 5 Fan Module 3 8 Ground
3 Fan Module 1 6 Fan Module 4 9 Power Supply Module 2

Status Indicators

This section discusses the following topics:

Front Indicators

Switch Indicators

Front panel LEDs are located on the right side of the chassis, as well as the display system, fan, and power supply status.

Figure 1 display the DCS-7280CR2K-30 front panel LEDs.

Figure 1. System Status Indicators

1 System status LED 3 Power supply 1 status LED
2 Fan tray status LED 4 Power supply 2 status LED

 

 

Table 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.

 

Note: Arista fixed systems take approximately 5-10 minutes to boot completely.

 

Port Indicators

Port LEDs, near their corresponding ports provide a link and operational status. Figure 2 display the Port LED location on the DCS-7280CR2K-30 switch.

Figure 2. Port LEDs

1 Port 1 2 Port 2

 

Table 2 provides status conditions corresponding to port LED states. Port LED behavior for QSFP+ and SFP+ ports is consistent.

Table 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.

 

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 3.

Table 3 provides status conditions that correspond to fan status LED states.

The AC Power Supply Status LEDs are on the power supply modules, as displayed in Figure 4.

Figure 3. Fan Status LED

1 Fan Status LED
Table 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.

 

 

Figure 4. AC Power Supply Status LED

1 Handle 2 Status LED 3 Release

 

 

Table 4 provides status conditions that correspond to the AC power supply status LED states.

Table 4. AC Power Supply Status LED States (Rear)
Power Supply State PWR-1600AC-F
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

 

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 Viewing Environment Status for further information on the show environment commands.

 

Parts List

Each switch provides an accessory kit containing the parts required to install the switch. This section lists the installation parts contained in the switch accessory kit.

This section discusses the following topics:

Rack Mount Parts

Four-Post Rack Mount Parts

Figure 1. Four-Post Rack Mount Parts

1 Rail Slide 3 Assembled Rail
2 Rail Rod 4 Rack Plugs

 

Two-Post Rack Mount Parts

Figure 2. Two-Post Rack Mount Parts

1 Mounting Ear (Left) 2 Mounting Ear (Right)

 

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.

 


Cabling the Switch

This section discusses the following topics:

Grounding the Switch

After mounting the switch into the rack, connect the switch to the data center ground. Figure 1 displays the location of the grounding pads located on the rear panel of the switches.

 

Important:

Grounding wires and grounding lugs (M4 x 0.7) are not supplied. Wire size should meet local and national installation requirements. Commercially available 12 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 1. Earth Grounding Pad Sockets

1 Power Supply Module 1 4 Fan Module 2 7 Fan Module 5
2 Management Ports 5 Fan Module 3 8 Ground
3 Fan Module 1 6 Fan Module 4 9 Power Supply Module 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. The Rear Panel 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.

     

AC Power Supplies

The following AC power supplies are supported.

  • PWR-1600AC

Figure 2 displays an AC power supply, including the power socket on the right side of the module. The AC power supply connects to a circuit that provides the required power, as specified by Table 1.

Figure 2. AC Power Supply

1 Handle 2 Status LED 3 Release

 

The power supplies require power cables that comply with IEC-320. The accessory kit provides two IEC-320 C13 to C14 power cables.

DC Power Supplies

The following DC power supplies are supported.

  • PWR-1611-DC

 

Figure 3. Supported DC power supplies

1 Status LED 2 Release 3 Handle
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.

 

Wire and Lug Preparation

Before performing any installation actions, ensure power is removed from DC circuits by turning off the power line servicing the circuits. Prepare the stranded wiring before you begin a DC power installation.
  1. Stranded copper wiring is required.
    • Commercially available 4 to 6 AWG wire is recommended for installations in the U.S.
      • Wire size should meet local and national installation requirements.
        • Grounding wires and grounding lugs are not supplied.
        • Strip the wires to the appropriate length for the lugs.

           

    The wires connecting the DC power supply to the power source must meet the following requirements:

    • DC Input Wire Size: 4 – 6 AWG (21.2 mm2 to 13.3 mm2).
    • Primary Ground Wire Size: 4 – 6 AWG (21.2 mm2 to 13.3 mm2) per power supply.
    • The conductors are copper.
      Figure 4. Lugs Wiring Terminations

      1 Insulated wire 3 Lug 5 1/2”
      2 Heat-shrink tubing 4 1/4” 6 5/8”

       

  2. Use agency-approved compression (pressure) lugs for wiring terminations with a single 5/16" mounting hole. Two-hole lugs should have 1/4" mounting holes on 5/8" centers.
  3. Slip on heat-shrink tubing on the wire ends before assembling the lugs onto the wire.
    • The lugs must be crimped with the proper tool.
    • The tubing should extend over the lug’s barrel and the wire's insulator.

       

  4. Shrink the tubing with a heat gun.

Connecting the PWR-1611-DC Power Supply

The PWR-1611-DC power supply connects to a circuit that provides -48 V to -60 V and 39 A. Ensure the wires connecting the DC power supply to the power source meet the following:
  • DC Input Wire Size: AWG 6 (13.3 mm2) or larger as appropriate.
  • Safety Ground Wire Size: AWG 6 (13.3 mm2) or larger as appropriate.
  • Wire Terminal (Lug): 2-hole lug, 6-8 AWG, #8 (4 mm) screw.
  • Over-current protection: 40 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.

 

Figure 5 displays the exploded and assembled views of the DC power supply with the connection adapter. The adapter is connected to the power supply using two captive fasteners as shown.

Figure 5. Connecting Cables to PWR-1611-DC PSU


 


1 -48 V 4 Release lever 7 Protective earth
2 Battery return 5 Captive screws    
3 Terminal cover 6 Lug locking nuts    

 

To connect a DC power supply to power source:

  1. Remove the connection adapter (if attached to the PSU) by turning the two captive fasteners and pulling off the adapter.
  2. Remove the terminal cover to expose the connectors on the adapter.
  3. Attach the appropriate lugs to the source DC wires.
  4. 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.

     
  5. Connect the DC-input wires to the adapter in this order:
    1. Protective Earth cable to the Protective Earth terminal on the right side of the adapter.
    2. -48V source DC cable to the negative -48V terminal on the left side of the adapter.
    3. Battery Return source DC cable to the Battery Return terminal on the left side of the adapter.
    4. Torque the screws to 2.7 N·m / 24.0 in·lbs.
      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.

       

  6. Connect the adapter to the power supply and fasten the two captive screws.

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 1 lists the pin connections of the RJ-45 to DB-9 adapter cable.

Table 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: For models with a console management port on the rear panel, RJ-45 pin 1 (RTS) is connected to RJ-45 pin 8 (CTS); RJ-45 pin 2 (DTR) and RJ-45 pin 7 (DSR) are not electrically connected to any signal.

 

 

The front panel contains the status LEDs. Figure 6 displays the front panel of the DCS-7280CR2K-30 switch. Figure 7 displays the management ports on the rear panel of the DCS-7280CR2K-30 switch. Front Panel and Rear Panel display the front and rear panels of all switches covered by this guide.

Figure 6. Front Panel LEDs

1 System status LED 3 Power supply 1 status LED
2 Fan tray status LED 4 Power supply 2 status LED

 

 

Figure 7. Management Ports

1 Console serial port 2 USB port 3 Ethernet management port
4 Link status LED 5 Activity status LED 6 System status LED

 

 

Connect the management 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.

     

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) that is 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.

  1. Provide power to the switch (Cabling the Switch).
  2. Connect the console port to a PC (Connecting Power Cables).

    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 canceled. To cancel
Zero Touch Provisioning, login as admin and type 'zerotouch cancel'
at the CLI.

localhost login:

     

  3. Log into the switch by typing admin at the login prompt. 
    localhost login: admin

     

  4. Cancel ZTP mode by typing zerotouch cancel.
    Important: This step initiates a switch reboot.

     

    localhost> zerotouch cancel

     

  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

     

  6. Enter global configuration mode. 
    localhost> enable
localhost# config

     

  7. Assign a password to the admin username with the username secret command. 
    localhost(config)# username admin secret pxq123

     

  8. Configure a default route to the network gateway. 
    localhost(config)# ip route 0.0.0.0/0 192.0.2.1

     

  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

     

  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.