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 1. Regulatory Model Numbers and Product Numbers
Regulatory Model Number (RMN) Product Number(s)
AN1723 DCS-7020SR-32C2

Maintenance and Field Replacement

The following topics are covered in this section:

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).
  • Replacement parts should be the same or compatible with those being replaced.
  • Before you begin, refer to the Arista Networks document Safety Information and Translated Safety Warnings available at: https://www.arista.com/en/support/product-documentation.
    Note: Refer to the front (Front Panel) and rear (Rear Panel) panel illustrations of your device to locate the appropriate LED, the release lever or handle, and the handle for the power supply and fan modules.

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.

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.
  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
    Note: The output of the command lists the power supplies in operation and should include the one you replaced.

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.

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.

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.
  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 panel shown below.

Figure 1. DCS-7020SR-32C2

1 Fan module 1 handle 3 Ground 5 Fan module 1 status LED
2 Fan module 3 handle 4 Fan module 3 status LED    

Front Panel

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

Note: Depending on the power supplies installed, your switch may look different.
Figure 1. DCS-7020SR-32C2

1 Ground lug 6 ESD
2 Blue handle indicates forward airflow 7 Console (serial) port
3 Ethernet management port 8 USB port
4 System status LED 9 Power supply 2 status LED
5 Fan status LED 10 Power supply 1 status LED

Parts List

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

 

Note: The accessory kit is included in a bag. For DCS-7020SR-32C2, four-post rack kit is optional and sold separately.

 

This section discusses the following topics:

Rack Mount Parts

This section discusses the following topics:

Four-Post Rack Mount Parts

Figure 1. Four-Post Rack Mount Parts

Two-Post Rack Mount Parts

Figure 2. Two-Post Rack Mount Parts for DCS-7020SR-32C2

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 Indicator LEDs

The following topics are covered in this section:

System-Level Status Indicator LEDs

Status indicator LEDs are located on the chassis, along with components like PSUs and fan modules. LEDs are located on the front (Front Panel) and the rear (Rear Panel) of the switch.

The following topics are covered in this section:

System Status Indicator LED

Figure 1 - System Status and Fan Status Indicators display the system and the fan status LEDs.

Figure 1. System Status and Fan Status Indicators

 
1 System status LED 2 Fan status LED
Table 1. System Status Indicator LED States
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.
Note: Arista fixed-form switches take approximately 5 to 10 minutes to boot.

Fan Status Indicator LED

Figure 1 - System Status and Fan Status Indicators display the fan status LED for the system.

Table 2. Fan Status Indicator LED States
LED Name LED State Device Status
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.

 

Note: Fan Module status LED is located on the fan module and displays the status of the corresponding fan module.

Port Status Indicator LEDs

Port LEDs, located in the vicinity of their corresponding ports, provide a link and operational status. Figure A-2 displays a representative Port LED location on the DCS-7020SR-32C2 switch.

Figure 2. Port Status LEDs
 
1 Port LED 2 Port number

Table 3 - Port LED States (Front) provides status conditions that correspond to port LED states. Port LED behavior for QSFP+ and SFP+ ports is consistent.

Table 3. 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.

Component Status Indicators

The following topics are covered in this section:

Fan Module Status LED

Each fan and power supply module has an LED that reports the module status. Fan module status LED is on the fan module (Figure 3 - Fan Module Status LED ) and is different from the system-level fan status LED (Fan Status Indicator LED).

Figure 3. Fan Module Status LED

 
1 Release lever 2 Fan module LED

Table 4 - Fan Module Status LED States provides status conditions that correspond to fan module status LED states.

Table 4. Fan Module Status LED States
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.

PSU Module Status LED

The AC power supply module status LEDs are on the power supply modules (Figure 4 - AC Power Supply Status LED ).

Figure 4. AC Power Supply Status LED


 
1 Power supply handle 3 Power supply status LED
2 Power supply release lever    

Table 5 - AC Power Supply Status LED States provide status conditions that correspond to the AC power supply status LED states.

Table 5. AC Power Supply Status LED States
Power Supply State PWR-400AC
Input power present Normal operation Green
Input power present Power Supply fault Yellow
No Input power Supply installed in chassis Blinking Yellow
Input power present Supply not installed in chassis Blinking 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.

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 (Grounding the Switch).
  2. Connect the console port to a PC (Connecting Serial and Management 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 cancelled. 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 into 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 configuring the management port IP address, 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

The following topics are covered in this section:

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 lug on the front-left mounting ear for the DCS-7020SR-32C2.

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 1. Earth Grounding Pad Sockets for DCS-7020SR-32C2
 
1 Ground lug 6 ESD
2 Blue handle indicates forward airflow 7 Console (Serial) port
3 Ethernet management port 8 USB port
4 System status LED 9 Power supply 2 status LED
5 Fan status LED 10 Power supply 1 status LED

Connecting Power Cables

Important:

Installation of this equipment must comply with local and national electrical codes. Consult with the appropriate regulatory agencies and inspection authorities to ensure compliance if necessary.

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.

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 PWR-400AC power supply is supported.

Figure 2 - AC Power Supply (PWR-400AC) displays an AC power supply. It connects to a circuit that provides the required power, as specified by Table 5 - Switch Specifications (Power Draw).

Figure 2. AC Power Supply (PWR-400AC)

 
1 Power Supply Handle 3 Power Supply Status LED
2 Power Supply Release Lever    

The power supply requires power cables that comply with IEC-320 and have a C13 plug. The accessory kit provides two IEC-320 C13 to C14 power cables.

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.

DC Power Supplies

The PWR-400-DC power supply is supported.

The following figure displays a PWR-400-DC power supply. It connects to a circuit that provides the required power, as specified by Table 5 - Switch Specifications (Power Draw).

Figure 3. DC Power Supply (PWR-400-DC)
 
1 Status LED 3 PSU Handle 5 Release lever
2 Ground terminal 4 Terminals    
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.
Note: Stranded copper wiring is required and should meet local and national installation requirements. Wires and grounding lugs are not supplied.
  1. Attach an ESD grounding strap.
  2. Prepare the stranded copper wiring for the power supply to be used. Table 1 - Wiring, Lug, and Tightening Torques for DC PSUs provide wiring, lug, and tightening torque information for the power supplies covered in this guide.
    Table 1. Wiring, Lug, and Tightening Torques for DC PSUs
    PSU Wire Size (1) Lug Type Tightening Torque
    (AWG) (mm 2) N • m in. • lbs.
    PWR-400-DC 10 - 12 6.0 - 4.0 M3.5 - single hole 1.0 9

    1Unless otherwise noted, wire size applies to -48V, Battery return, and Protective earth wires.

  3. Strip the wires to the appropriate length for the lugs to be used.
  4. Use agency-approved compression (pressure) lugs for wiring terminations.
  5. Slip-on heat-shrink tubing on the wire ends before assembling the lugs onto the wire.
  6. Crimp the lugs with the proper tool, and ensure that the tubing extends over the barrel of the lugs and the insulation on the wires (Figure 4 - Lug Preparation (two-hole lug shown) ).
    Figure 4. Lug Preparation (two-hole lug shown)
     
    1 Insulated wire 3 Lug B 1/2"
    2 Heat-shrink tubing A 1/4" C 5/8"
  7. Shrink the tubing with a heat gun.

Connecting a DC Power Supply to Power Source

To connect a DC power supply to a power source:
  1. Prepare the stranded wiring (Wire and Lug Preparation).
  2. Attach the appropriate lugs to the source DC wires.
  3. Connect the DC-input wires to the appropriate terminals using the specified torque (Table 1 - Wiring, Lug, and Tightening Torques for DC PSUs ) in the following order:
    Note: Remove terminal covers as needed.
    1. Ground wire to the Protective Earth (PE) terminal.
    2. Negative source DC cable to the negative (- / -48V) terminal.
    3. Positive (+) source DC cable to the positive (+ / Rtn) terminal.

       

      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.

      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.

      Important:

      Apply the ground connection first during installation and remove it last when removing power.

      Appliquer le motif connexion tout d’abord pendant l’installation et supprimer dernière lors du retrait de puissance.

  4. Replace the terminal covers as required.

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

Table 2. 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: 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.

 

Figure 5 - Management Ports display the management console and USB ports on the front panel.

Figure 5. Management Ports

 
1 Link status LED 4 USB port
2 Activity status LED 5 Serial (console) port
3 Ethernet Management port    
Connect the 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.
    Note: The DCS-7020SR-32C2 chassis has other ports labeled Alarm, Clk in, Clk Out, and ToD. These ports are not supported. Do not connect any cables to these ports.
    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-7020SR-32C2 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-7020SR-32C2.

After completing the instructions for your rack type, proceed to Cabling the Switch.

Two-Post Rack Mount

To mount the switch onto a two-post rack, attach the mounting ears to the chassis, then attach the ears to the rack posts. Two-post accessory kit includes 2x mounting ears as two-post mounting parts.

 

Important:

Attachment pins must engage all three upper bracket holes.

Goupilles de fixation doivent être bloquer tous les trois trous de la bride supérieure.

Inserting the Switch into the Rack

This procedure attaches the switch to the rack (Figure 3-2).
  1. Lift the chassis into the rack. Position the mounting ears against the rack posts.
    Note: The mounting ears should be the same height to ensure the device is level.
  2. Select mounting screws that fit your equipment rack.
  3. Attach the mounting ears to the rack posts.
    Figure 2. Inserting the Switch into the Rack

    After completing the two-post rack mount, proceed to Cabling the Switch.

Four-Post Rack Mount

Note: For DCS-7020SR-32C2, four-post rack kits are optional and sold separately.

The switch is mounted onto a four-post rack by assembling two rails onto the rear posts, sliding the switch onto the rails, and securing the switch to the front posts.

The installation kit provides the following four-post mounting parts:

  • 2x mounting brackets
  • 2x rail-rods
  • 2x rail-slides

The rail-rods and rail-slides assemble into two identical slide-rails.

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 4 - Attaching the Mounting Brackets to the Switch Chassis). 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 and then install the rails with bolts that fit the rack.
Figure 4. Attaching the Mounting Brackets to the Switch Chassis

This procedure attaches the rails to a four post rack:

  1. Slide a rail-rod into a rail-slide (Figure 5 - Assembling the Rails) until the rail clip makes an audible click.
    Note: The rail clip prevents the extension of the rail beyond the maximum supported distance between the front and rear rack posts.
    Figure 5. Assembling the Rails

    1 Rail Slide 3 Rail (assembled)
    2 Rail Rod A Rack Plugs
  2. Attach the rail to the right rear rack post by inserting rod-end rack plugs into post slots (Figure 6 - Attaching the Rails ). The slide assembly must be inside the right posts relative to the left rack posts.
    Note: If the rack plugs were previously removed, use bolts to attach the rail to the rack.
  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 6 - Attaching the Rails ).
  4. Repeat Step 1 through Step 3 for the left posts. Ensure the rails are on the same horizontal level.
    Figure 6. Attaching the Rails

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.
  1. Lift the switch into the rack and insert the mounting brackets into the slide rails (Figure 7 - Inserting the Switch onto the Rails).
    Figure 7. Inserting the Switch onto the Rails

  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.
  3. Attach the bracket flanges to the rack post using the quick-release thumb screws supplied with the brackets (Figure 8 - Attaching the Switch to the Rack Posts ).
    Figure 8. Attaching the Switch to the Rack Posts

    After completing the four-post rack mount, proceed to Cabling the Switch.