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EX8208 Chassis

 

Understanding EX8208 Switch Component and Functionality Redundancy

The Juniper Networks EX8208 Ethernet Switch is available as a fully redundant system. A redundant EX8208 switch configuration is designed so that no single point of failure can cause the entire switch to fail. See EX8208 Switch Configurations.

Hardware Components That Provide Redundancy

The following hardware components provide redundancy to an EX8208 switch:

  • SRE modules—An EX8208 switch can have either one Switch Fabric and Routing Engine (SRE) module or two SRE modules. If two SRE modules are installed, one SRE module functions as the master and the other functions as the backup. If the master SRE module fails or is removed the backup module takes over as the master SRE module.

    When the SRE modules are configured for graceful switchover, the backup SRE module automatically synchronizes its configuration and state with those of the master SRE module. Any update to the master SRE module is replicated on the backup SRE module. If the backup module assumes mastership, packet forwarding continues through the switch.

  • Power supplies—You can install up to six AC or six DC power supplies in an EX8208 switch. Each power supply connects to the backplane of the chassis, which distributes the output power produced by the power supplies to different switch components. (See Backplane in an EX8208 Switch.) Each power supply provides power to all the components in the switch.

    An N+1 power configuration is required for Juniper Networks EX8200 Ethernet Switches. In an N+1 power configuration, if one power supply fails or is removed, the remaining power supplies continue to supply power for the entire system without interruption. If dual power feed redundancy is required, the required power configuration is N+N. The DC power supplies provide independent A and B power feeds so that dual power redundancy is available even in an N+1 power configuration. See AC Power Supply in an EX8200 Switch and DC Power Supply in an EX8200 Switch.

  • Cooling system—The cooling system in an EX8200 switch consists of a single fan tray. The fan tray contains 12 fans. Under normal operating conditions, the fans in the fan tray run at less than full speed.

    The fans are controlled by two fan tray controllers. The fans are numbered 1 through 12. Fans 1 through 6 are controlled by the first fan tray controller. Fans 7 through 12 are controlled by the second fan tray controller. If one fan tray controller fails, the other fan tray controller keeps half the fans working. This allows the switch to continue to operate normally as long as the remaining fans cool the chassis sufficiently.

    The fan tray continues to operate indefinitely and provides sufficient cooling even when a single fan fails provided the room temperature is within the operating range. See EX8208 Cooling System.

Routing Engine and Control Redundancy

Each SRE module contains switch fabric circuitry, Routing Engine circuitry, and switch control and management circuitry. An EX8208 switch can have one SRE module or two SRE modules. If a switch has two SRE modules, one functions as the master while the other functions as a backup and is in standby mode. This provides the switch with full redundancy (1+1) for Routing Engine and switch control functionality.

Table 1 shows the available slots in the EX8208 chassis and the Routing Engine and control redundancy associated with different SRE module and Switch Fabric (SF) module combinations.

Table 1: Routing Engine and Control Redundancy for EX8208 Switches

Switch Configuration

Slot SRE0

Slot SRE1

Slot SF

Routing Engine and Control Redundancy

Base configuration

SRE module

Empty

SF module

No

Base configuration

Empty

SRE module

SF module

No

User-defined configuration

SRE module

SRE module

Empty

Yes

Redundant configuration

SRE module

SRE module

SF module

Yes

Switch Fabric Redundancy

The switch fabric circuitry in an EX8208 switch is distributed across three modules—two SRE modules and one SF module. Any two of these three modules must be installed and functional to provide a working switch fabric with no redundancy. The third module, when present, provides partial redundancy (2+1) for the switching functionality, such that if any one of the two functional modules becomes nonoperational, the third module takes over.

Table 2 shows the available slots in an EX8208 chassis and the switch fabric redundancy associated with different SRE module and SF module combinations.

Table 2: Switch Fabric Redundancy for EX8208 Switches

Switch Configuration

Slot SRE0

Slot SRE1

Slot SF

Switch Fabric Redundancy

Base configuration

SRE module

Empty

SF module

No

Base configuration

Empty

SRE module

SF module

No

User-defined configuration

SRE module

SRE module

Empty

No

Redundant configuration

SRE module

SRE module

SF module

Yes

Slot Numbering for an EX8208 Switch

An EX8208 chassis accepts eight line cards, two Switch Fabric and Routing Engine (SRE) modules, one Switch Fabric (SF) module, one fan tray, and six power supplies (AC or DC). All 11 slots for the line cards and the modules run horizontally across the front of the chassis. The fan tray slot runs vertically on the left of the chassis front. The six power supply slots run vertically across the front bottom of the chassis.

Slot Numbering for SRE and SF Module Slots and Line Card Slots

Table 3 lists the slot numbers on the EX8208 chassis and the components those slots accept.

Table 3: Slot Numbering for an EX8208 Switch

Slot Label

Components Accepted in Slot

0

Line card

1

Line card

2

Line card

3

Line card

SRE0

SRE module

SF

SF module

SRE1

SRE module

4

Line card

5

Line card

6

Line card

7

Line card

Figure 1 shows the slot numbering, which is on the front left of the chassis.

Figure 1: Slot Numbering for an EX8208 Switch
Slot Numbering for an EX8208
Switch
Note

Figure 1 shows line cards that have 2-in.-long ejector levers. An earlier version of 8-port SFP+ line card, 48-port RJ-45 line card, and 48-port SFP line card has 4-in.-long ejector levers.

Slots 0 through 7 accept one of the line cards available. See Installing a Line Card in an EX8200 Switch.

Slots SRE0 and SRE1 accept only the SRE module. You can install one SRE module or two SRE modules based on the configuration of your switch. See Switch Fabric and Routing Engine (SRE) Module in an EX8208 Switch.

Note

We recommend that you install two SRE modules for redundancy. If you install only one SRE module, we recommend that you install it in the slot SRE0. See Installing an SRE Module in an EX8208 Switch.

Slot SF accepts only the SF module. See Switch Fabric (SF) Module in an EX8208 Switch. An EX8208 switch can have either zero SF modules or one SF module based on your switch configuration. The SF module is keyed so that it does not fit in any other slot in the chassis. See Installing an SF Module in an EX8208 Switch.

Slot Numbering for the Power Supply Slots

The chassis has six vertical slots on its front bottom. You can install up to six power supplies (either all AC or all DC) in these slots, which are labeled PSU 0 through PSU 5 (from left to right). Table 4 lists the slot numbers for the power supplies on an EX8208 switch. See AC Power Supply in an EX8200 Switch and DC Power Supply in an EX8200 Switch.

Caution

Mixing different types of power supplies in the same chassis is not a supported configuration.

Table 4: Slot Numbering for Power Supply Slots on an EX8208 Switch Chassis Front

Slot Label

Components Accepted in Slot

PSU 0

Power supply

PSU 1

Power supply

PSU 2

Power supply

PSU 3

Power supply

PSU 4

Power supply

PSU 5

Power supply

Figure 2 shows the slot numbering for the power supply slots in an EX8208 switch.

Figure 2: Slot Numbering for Power Supply Slots on an EX8208 Switch Chassis Front
Slot Numbering
for Power Supply Slots on an EX8208 Switch Chassis Front
Note

Power supplies can be installed in any slot. You do not have to install them in serial order. See Installing an AC Power Supply in an EX8200 Switch and Installing a DC Power Supply in an EX8200 Switch.

LCD Panel in an EX8200 Switch

The LCD panel on the top front of the EX8200 switch chassis shows two lines of text with a maximum of 16 characters in each line. The LCD panel displays a variety of information about the switch and provides menu options to perform basic operations such as initial configuration and switch reboot.

There are two navigation buttons—Menu and Enter—to the right of the LCD panel.

See Figure 3.

Figure 3: LCD Panel in an EX8200 Switch
LCD Panel in an EX8200 Switch

You can configure the second line of the LCD panel to display a custom message. If the LCD panel is configured to display a custom message, the Menu button and the Enter button are disabled. See Configuring the LCD Panel on EX Series Switches (CLI Procedure).

The LCD panel has a backlight. If the LCD panel is idle for 60 seconds, the backlight turns off. You can turn on the backlight by pressing the Menu or Enter button once. After turning on the backlight, you can toggle between the LCD menus by pressing the Menu button and navigate through the menu options by pressing the Enter button.

Note

The chassis viewer in the J-Web interface also displays the LCD panel. From the J-Web interface, you can view real-time status information in the LCD panel. See Dashboard for EX Series Switches.

LCD Panel Modes

The LCD panel operates in four modes: boot, idle, status, and maintenance.

The LCD panel operates in boot mode during switch reboot.

The boot mode displays the key milestones in the switch boot process. The boot mode does not have any menu options. After the boot process is complete, the LCD panel automatically reverts to the Idle menu.

In the idle mode, line two of the Idle menu displays the Status LED modes of the network ports and the total number of alarms in the system. The number of alarms is updated every second.

The status mode allows you to get status information for the following items:

  • Switch fabric in Switch Fabric and Routing Engine (SRE) modules in EX8208 switches

  • Routing Engine (RE) and switch fabric in Switch Fabric (SF) module(s) in EX8216 switches

  • Power supplies

  • Fan tray(s) and chassis temperature

  • Junos OS version installed

The maintenance mode allows you to cycle through options for configuring and troubleshooting the switch:

  • System halt

  • Reboot system

  • Load rescue configuration

  • Revert to factory configuration

  • EZSetup

LCD Panel Menus

The LCD panel has three menus: Idle, Status, and Maintenance. In each of these menus, line one of the LCD panel displays the hostname of the switch. Toggle between the LCD menus by pressing the Menu button. Navigate through the menu options by pressing the Enter button.

Table 5 describes the LCD panel menu options.

Table 5: LCD Panel Menu Options for the EX8200 Switch

Menu

Description

Idle

In the Idle menu:

  • Press Enter to cycle through the Status LED modes, which are port status indicators:

    • ADM (enabled/disabled)

    • SPD (speed)

    • DPX (duplex)

    • POE (Power over Ethernet)

    See Network Port LEDs in an EX8200 Switch for information on the Status LED.

  • Press Menu to exit the Idle menu and go to the Status menu.

Status

The Status menu has the following options:

  • Switch fabric status—Choose one of the following:

    • Press Enter to display the status of the switch fabric in the SRE modules (SRE0 and SRE1) in EX8208 switches and the SF modules (SF) in EX8216 switches: OK, Fld (failed), ABS (absent)

    • Press Menu to go to the next option in the Status menu.

  • Power supply status (1)—Choose one of the following:

    • Press Enter to display the status of power supplies 0 and 1: OK, Fld, ABS.

    • Press Menu to go to the next option in the Status menu.

  • Power supply status (2)—Choose one of the following:

    • Press Enter to display the status of power supplies 2, 3, 4, and 5: OK, Fld, ABS.

    • Press Menu to go to the next option in the Status menu.

  • Environment status—Choose one of the following:

    • Press Enter to display the status of the fan tray(s) and the chassis temperature:

      • Fan tray(s) status: OK, Fld, ABS

      • Chassis temperature status: OK, High, Shutdown

    • Press Menu to go to the next option in the Status menu.

  • Junos OS version status—Choose one of the following:

    • Press Enter to display the version of Junos OS for EX Series switches loaded on the switch.

    • Press Menu to go to the next option in the Status menu.

  • EXIT STAT MENU?—Choose one of the following:

    • Press Enter to exit the Status menu.

    • Press Menu to return to the Switch fabric status option.

If you do not want users to use Status menu options, disable the entire menu or individual menu options. See Configuring the LCD Panel on EX Series Switches (CLI Procedure).

Maintenance

The Maintenance menu has the following options:

  • SYSTEM HALT?—Choose one of the following:

    • Press Enter to halt the master SRE module in an EX8208 switch or to halt the master RE module in an EX8216 switch. Press Enter again to confirm the halt.

      In a base configuration switch, the master SRE or RE module will be gracefully halted but not powered off. Press Enter on your management device or power cycle the switch to bring the switch back up.

      In a redundant configuration, the backup SRE or RE module takes over mastership when the master SRE or RE module is halted. To completely halt the switch, use the request system halt other-routing-engine CLI command to halt the backup SRE or RE module before halting the master SRE or RE module. Press Enter on your management device or power cycle the switch to bring the switch back up.

      See EX8208 Switch Configurations or EX8216 Switch Configurations for information on configuration types.

    • Press Menu to go to the next option in the Maintenance menu.

  • SYSTEM REBOOT?—Choose one of the following:

    • Press Enter to reboot the master SRE or RE module. Press Enter again to confirm the reboot.

    • Press Menu to go to the next option in the Maintenance menu.

  • LOAD RESCUE?—Choose one of the following:

    • Press Enter to roll back the switch to the previous valid configuration. Press Enter again to confirm the rollback.

    • Press Menu to go to the next option in the Maintenance menu.

  • FACTORY DEFAULT?—Choose one of the following:

    • Press Enter to restore the switch to the factory default configuration. Press Enter again to confirm the restoration. The LCD panel flashes a success or failure message and returns to the Idle menu.

    • Press Menu to go to the next option in the Maintenance menu.

  • ENTER EZSETUP?—Choose one of the following:

    • Press Enter to launch EZSetup. Press Enter again to confirm the launch.

      EZSetup configures DHCP and enables the J-Web user interface on the switch. The LCD panel flashes a success or failure message for approximately 10 seconds and returns to the Idle menu.

    • Press Menu to go to the next option in the Maintenance menu.

    Note: You can use the EZSetup option only if the switch is in the factory default configuration.

  • EXIT MAINT MENU?—Choose one of the following:

    • Press Enter to exit the Maintenance menu.

    • Press Menu to return to the SYSTEM HALT option.

If you do not want users to use Maintenance menu options, disable the entire menu or individual menu options. See Configuring the LCD Panel on EX Series Switches (CLI Procedure).

You can view the information about the LCD panel in EX8200 switches by executing the command show chassis hardware. It shows the version, part number, serial number, and description of the LCD panel.

Backplane in an EX8208 Switch

The backplane is a printed circuit board that forms the back of the line card cage. The Switch Fabric and Routing Engine (SRE) modules, Switch Fabric (SF) module, power supplies, and line cards plug into the backplane from the front of the chassis. The backplane contains an EEPROM that stores the serial number and revision level of the backplane.

The backplane performs the following functions:

  • Power distribution—The backplane distributes power to all the switch components from the power supplies that plug into it.

  • Control-signal connectivity—The backplane transports the control signals exchanged by system components for monitoring, control, and management purposes.

  • Transfer of data between line cards and SRE modules—The backplane provides connectivity for data traffic to and from the line cards and the SRE modules.

Warning

High levels of electrical energy are distributed across the switch backplane. Do not touch the backplane connectors, or any component connected to the backplane, with any metallic object while servicing components installed in the switch.

Chassis Status LEDs in an EX8200 Switch

The top front of the chassis of an EX8200 switch has three LEDs on the right side of the LCD panel.

See Figure 4.

Figure 4: Chassis Status LEDs
Chassis Status LEDs

Table 6 describes the chassis status LEDs in an EX8200 switch, their colors and states, and the status they indicate. You can view the colors of the three LEDs remotely through the CLI by issuing the operational mode command show chassis lcd.

Table 6: Chassis Status LEDs in an EX8200 Switch

LED Label (Description)

Color

State and Description

ALM (Alarm)

Unlit

No alarm.

Red

Major alarm.

Yellow

Minor alarm.

SYS (System)

Unlit

Switch is powered off.

Yellow

One or more component failures are generating one or more alarms.

Green

Switch is operating normally.

MST (Master)

Unlit

Switch is powered off.

Green

Master Routing Engine is operational.

A major alarm (red) indicates a critical error condition that requires immediate action.

A minor alarm (yellow) indicates a noncritical condition that requires monitoring or maintenance. A minor alarm that is left unchecked might cause interruption in service or performance degradation.

All three LEDs can be lit simultaneously.

Network Port LEDs in an EX8200 Switch

Each network port on the faceplate of a line card has two LEDs. Figure 5 shows the network port LEDs on the line cards.

Figure 5: Network Port LEDs on Line Cards
Network Port LEDs on
Line Cards

The LEDs labeled Link/Activity in Figure 5 indicate link activity.

Table 7 describes the Link/Activity LED.

Table 7: Network Port LEDs on Line Cards in an EX8200 Switch—Link/Activity LED

LED

Color

State and Description

Link/Activity

Green

  • On steadily—The port and the link are active, but there is no link activity.

  • Blinking—The port and the link are active, and there is link activity.

  • Off—The port is not active.

The LEDs labeled Status in Figure 5 indicate the status of one of the three port parameters. The port parameters are administrative status, speed, duplex mode, and Power over Ethernet (PoE) status.

Table 8 describes the Status LED. From the Idle menu of the LCD panel, use the Enter button on the LCD panel to toggle between the ADM, SPD, DPX, and POE indicators.

Table 8: Network Port LEDs on Line Cards in an EX8200 Switch—Status LED

LED

LCD Indicator

State, Color, and Description

Status

LED: ADM

Indicates the administrative status (enabled or disabled). The status indicators are:

  • Green—Administrative status enabled.

  • Yellow—The port is down.

  • Unlit—Administrative status disabled.

LED: SPD

Indicates the speed. The speed indicators are different in the line cards.

The speed indicators for 8-port SFP+ line cards are:

  • Unlit—Less than 10 Gbps

  • Green—10 Gbps

The speed indicators for 40-port SFP+ line cards are:

  • Unlit—10 Mbps

  • Green—Blinking—100 Mbps

  • Green—On steadily—1000 Mbps or 10 Gbps

The speed indicators for EX8200-2XS-40P line cards are:

  • Unlit—10 Mbps

  • Green—Blinking—100 Mbps

  • Green—On steadily—1000 Mbps or 10 Gbps

The speed indicators for EX8200-2XS-40T line cards are:

  • Unlit—10 Mbps

  • Green—Blinking—100 Mbps

  • Green—On steadily—1000 Mbps or 10 Gbps

The speed indicators for EX8200-48PL line cards are:

  • Unlit—10 Mbps

  • Green—Blinking—100 Mbps

  • Green—On steadily—1000 Mbps

The speed indicators for EX8200-48TL line cards are:

  • Unlit—10 Mbps

  • Green—Blinking—100 Mbps

  • Green—On steadily—1000 Mbps

The speed indicators for 48-port SFP line cards are:

  • Unlit—10 Mbps

  • Green—Blinking—100 Mbps

  • Green—On steadily—1000 Mbps

The speed indicators for 48-port RJ-45 line cards are:

  • Unlit—10 Mbps

  • Green—Blinking—100 Mbps

  • Green—On steadily—1000 Mbps

LED: DPX

Indicates the duplex mode. The status indicators are:

  • Green—Port is set to full-duplex mode.

  • Unlit—Port is not set to full-duplex mode.

LED: POE

Indicates the PoE mode. The status indicators are:

  • Green—PoE is enabled on the port and a device is drawing power.

  • Yellow—PoE is enabled on the port, but no power is drawn from the port.

  • Unlit—PoE is not enabled on the port.