Troubleshooting EX9200 Components

Problem

Cause

Solution

Follow these guidelines to troubleshoot the fans:

• Check the fan LEDs and alarm LEDs on the craft interface.

  If the major alarm LED on the craft interface glows, use the CLI to get information about the source of an alarm condition:

  If the CLI output lists only one fan failure and the other fans are functioning normally, the fan is most likely faulty and you must replace the fan tray.

• Place your hand near the exhaust vents at the side of the chassis to determine whether the fans are pushing air out of the chassis.

• If a fan tray is removed, both a minor alarm and a major alarm occur.

• The following conditions automatically cause the fans to run at full speed and also trigger the indicated alarm:

  • A fan fails (major alarm).

  • The switch temperature exceeds the temperature warm threshold (minor alarm).

  • The temperature of the switch exceeds the temperature hot threshold (major alarm and automatic shutdown of the power supplies).

Problem

Cause

Solution

• Check the LEDs on each power supply faceplate.

  • If an AC power supply is correctly installed and functioning normally, the AC OK and DC OK LEDs light steadily, and the PS FAIL LED is not lit.

  • If a DC power supply is correctly installed and functioning normally, the PWR OK, BRKR ON, and INPUT OK LEDs glow steady green.

• Issue the CLI show chassis environment pem command to check the status of installed power supplies. As shown in the sample output, the value Online in the rows labeled State must indicate that each of the power supplies is functioning normally.

  The output is of an EX9208 switch. The output is similar for EX9204 and EX9214 switches.

If a power supply is not functioning normally, perform the following steps to diagnose and correct the problem:

• If a major alarm condition occurs, issue the show chassis alarms command to determine the source of the problem.

• If all power supplies have failed, the system temperature might have exceeded the threshold, causing the system to shut down.

  Note:

  If the system temperature exceeds the threshold, Junos OS shuts down all power supplies so that no status is displayed.

  Junos OS also can shut down one of the power supplies for other reasons. In this case, the remaining power supplies provide power to the switch, and you can still view the system status through the CLI or display.

• Check that the DC circuit breaker or AC input switch is in the on position and that the power supply is receiving power.

• Verify that the source circuit breaker has the proper current rating. Each power supply must be connected to a separate source circuit breaker.

• Verify that the AC power cord or DC power cables from the power source to the switch are not damaged. If the insulation is cracked or broken, immediately replace the cord or cable.

• Connect the power supply to a different power source with a new power cord or power cables. If the power supply status LEDs indicate that the power supply is not operating normally, the power supply is the source of the problem. Replace the power supply with a spare.

Problem

Solution

• Monitor the LED labeled OK on the craft interface as soon as a line card is seated in an operating switch.

  The Routing Engine downloads the line card software to it under two conditions: the line card is present when the Routing Engine boots Junos OS, and the line card is installed and requested online through the CLI or the button on the front panel. The line card then runs diagnostics, during which the OK LED blinks. When the line card is online and functioning normally, the OK LED is lit green steadily.

• Make sure the line card is properly seated in the midplane. Check that each ejector handle has been turned clockwise and is tight.

• Check the OK/FAIL LED on the line card and OK and FAIL line card LEDs on the craft interface. When the line card is online and functioning normally, the OK LED is lit green steadily.

• Issue the show chassis fpc command to check the status of installed line cards. As shown in the sample output, the value Online in the column labeled State indicates that the line card is functioning normally:

  Note:

  The show chassis fpc command displays the status of the line cards.

  For more detailed output, add the detail option. The following example does not specify a slot number, which is optional:

Problem

• Description
• Environment

Cause

On EX9200 switches, if an IRB logical interface is configured on an EX9200-6QS line card as part of a VLAN, any device that is connected through that interface is unable to route traffic outside of the subnet because the EX9200-6QS line card drops all ARP requests. This happens because even though the minimum Junos OS release that supports the EX9200-6QS line card is Junos OS Release 14.2R1, this release does not support a configuration that includes an IRB logical interface configured on an EX9200-6QS line card as part of a VLAN.

Solution

Upgrade Junos OS to the release specified in TSB16659.

Backup Routing Engine Alarms

For switches with primary and backup Routing Engines, a primary Routing Engine can generate alarms for events that occur on a backup Routing Engine. Table 3 lists chassis alarms generated for events that occur on a backup Routing Engine.

Purpose

Use the monitoring functionality to filter and view system log messages for EX Series switches.

Action

To view events in the J-Web interface, select Monitor > Events and Alarms > View Events.

Apply a filter or a combination of filters to view messages. You can use filters to display relevant events. Table 4 describes the different filters, their functions, and the associated actions.

To view events in the CLI, enter the following command:

show log

Meaning

Table 5 describes the Event Summary fields.

Problem

Cause

Temperature sensors in the chassis monitor the temperature of the chassis. The switch triggers an alarm if a fan fails or if the temperature of the chassis exceeds permissible levels for some other reason.

Solution

When the switch triggers a temperature alarm such as the FPC 0 EX-PFE1 Temp Too Hot alarm, use the show chassis environment and the show chassis temperature-thresholds commands to identify the condition that triggered the alarm.

1. Connect to the switch by using Telnet, and issue the show chassis environment command. This command displays environmental information about the switch chassis, including the temperature. The command also displays information about the fans, power supplies, and Routing Engines. Following is a sample output on an EX9208 switch. The output is similar on other EX Series switches.

   show chassis environment (EX9208 Switch)

   Table 6 lists the output fields for the show chassis environment command. The table lists output fields in the approximate order in which they appear.

   Table 6: show chassis environment Output Fields

   Field Name	Field Description
   Class	Information about the category or class of chassis component: Temp: Temperature of air flowing through the chassis in degrees Celsius (°C) and degrees Fahrenheit (°F) Fans: Information about the status of fans and blowers
   Item	Information about the chassis components: Flexible PIC Concentrators (FPCs)—that is, the line cards Control Boards (CBs) Routing Engines Power entry modules (PEMs)—that is, the power supplies
   Status	Status of the specified chassis component. For example, if Class is Fans, the fan status can be: OK: The fans are operational. Testing: The fans are being tested during initial power-on. Failed: The fans have failed or the fans are not spinning. Absent: The fan tray is not installed.
   Measurement	Depends on the Class. For example, if Class is Temp, indicates the temperature in degrees Celsius (°C) and degrees Fahrenheit (°F). If the Class is Fans, indicates actual fan RPM.

2. Issue the command show chassis temperature-thresholds . This command displays the chassis temperature threshold settings. The following is a sample output on an EX9208 switch. The output is similar on other EX Series switches.

   show chassis temperature-thresholds (EX9208 Switch)

   Table 7 lists the output fields for the show chassis temperature-thresholds command. The table lists output fields in the approximate order in which they appear.

   Table 7: show chassis temperature-thresholds Output Fields

   Field Name	Field Description
   Item	Chassis component. You can configure the threshold information for components such as the chassis, the Routing Engines, and FPC for each slot in each FRU to display in the output. By default, information is displayed only for the chassis and the Routing Engines.
   Fan speed	Temperature thresholds, in degrees Celsius, for the fans to operate at normal and at high speed. Normal—The temperature threshold at which the fans operate at normal speed and when all the fans are present and functioning normally. High—The temperature threshold at which the fans operate at high speed or when a fan has failed or is missing. Note: An alarm is triggered when the temperature exceeds the threshold settings for a yellow, amber, or red alarm.
   Yellow or amber alarm	Temperature threshold, in degrees Celsius, that triggers a yellow or amber alarm. Normal—The temperature threshold that must be exceeded on the device to trigger a yellow or amber alarm when the fans are running at full speed. Bad fan—The temperature threshold that must be exceeded on the device to trigger a yellow or amber alarm when one or more fans have failed or are missing.
   Red alarm	Temperature threshold, in degrees Celsius, that triggers a red alarm. Normal—The temperature threshold that must be exceeded on the device to trigger a red alarm when the fans are running at full speed. Bad fan—The temperature threshold that must be exceeded on the device to trigger a red alarm when one or more fans have failed or are missing.
   Fire shutdown	Temperature threshold, in degrees Celsius, at which the switch shuts down in case of fire.

When a temperature alarm is triggered, you can identify the condition that triggered it by running the show chassis environment command to display the chassis temperature values for each component and comparing those with the temperature threshold values. You can display the temperature threshold values by running the show chassis temperature-thresholds command.

For example, for FPC 3:

• If the temperature of FPC 3 exceeds 55° C, the output indicates that the fans are operating at a high speed (no alarm is triggered).

• If the temperature of FPC 3 exceeds 65° C, a yellow alarm is triggered to indicate that one or more fans have failed.

• If the temperature of FPC 3 exceeds 75° C, a yellow alarm is triggered to indicate that the temperature threshold limit is exceeded.

• If the temperature of FPC 3 exceeds 80° C, a red alarm is triggered to indicate that one or more fans have failed.

• If the temperature of FPC 3 exceeds 105° C, a red alarm is triggered to indicate that the temperature threshold limit is exceeded.

• If the temperature of FPC 3 exceeds 110° C, the switch is powered off.

Table 8 lists the possible causes for the switch to generate a temperature alarm. It also lists the respective remedies.