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Troubleshoot QFX5120 Components

 

Understand Alarms

The QFX Series switches support different alarm types and severity levels. Table 1 provides a list of alarm terms and definitions that may help you in monitoring the device.

Table 1: Alarm Terms and Definitions

Term

Definition

Alarm

Signal alerting you to conditions that might prevent normal operation. On the device, alarm indicators might include the LCD panel and LEDs on the device. The LCD panel (if present on the device) displays the chassis alarm message count. Blinking amber or yellow LEDs indicate yellow alarm conditions for chassis components.

Alarm condition

Failure event that triggers an alarm.

Alarm severity levels

Seriousness of the alarm. The level of severity can be either major (red) or minor (yellow).

  • Major (red)—Indicates a critical situation on the device that has resulted from one of the following conditions. A red alarm condition requires immediate action.

    • One or more hardware components have failed.

    • One or more hardware components have exceeded temperature thresholds.

    • An alarm condition configured on an interface has triggered a critical warning.

  • Minor (yellow or amber)—Indicates a noncritical condition on the device that, if left unchecked, might cause an interruption in service or degradation in performance. A yellow alarm condition requires monitoring or maintenance. For example, a missing rescue configuration generates a yellow system alarm.

Alarm types

Alarms include the following types:

  • Chassis alarm—Predefined alarm triggered by a physical condition on the device such as a power supply failure or excessive component temperature.

  • Interface alarm—Alarm you configure to alert you when an interface link is down. Applies to ethernet, fibre-channel, and management-ethernet interfaces. You can configure a red (major) or yellow (minor) alarm for the link-down condition, or have the condition ignored.

  • System alarm—Predefined alarm that might be triggered by a missing rescue configuration, failure to install a license for a licensed software feature, or high disk usage.

Interface Alarm Messages

Interface alarms are alarms that you configure to alert you when an interface is down.

To configure an interface link-down condition to trigger a red or yellow alarm, or to configure the link-down condition to be ignored, use the alarm statement at the [edit chassis] hierarchy level. You can specify the ethernet, fibre-channel, or management-ethernet interface type.

Note

Fibre Channel alarms are valid only on QFX3500 devices.

Note

When red alarms or major alarms are issued on QFX5100 and EX4600 switches, the alarm LED glows amber instead of red.

By default, major alarms are configured for interface link-down conditions on the control plane and management network interfaces in a QFabric system. The link-down alarms indicate that connectivity to the control plane network is down. You can configure these alarms to be ignored using the alarm statement at the [edit chassis] hierarchy level.

Note

If you configure a yellow alarm on the QFX3008-I Interconnect device, it will be handled as a red alarm.

Create an Emergency Boot Device

If Junos OS on the device is damaged in some way that prevents the software from loading properly, you can use an emergency boot device to repartition the primary disk and load a fresh installation of Junos OS. Use the following procedure to create an emergency boot device.

Before you begin, you need to download the installation media image for your device and Junos OS release from https://www.juniper.net/customers/support/.

Note

In the following procedure, we assume that you are creating the emergency boot device on a switch. You can create the emergency boot device on another Juniper Networks switch or router, or any PC or laptop that supports Linux. The steps you take to create the emergency boot device vary, depending on the device.

To create an emergency boot device:

  1. Use FTP to copy the installation media image into the /var/tmp directory on the device.
  2. Insert a USB device into the USB port.
  3. From the Junos OS CLI, start the shell:
    user@device> start shell
    %
  4. Switch to the root account using the su command:
    % su
    Password: password
    Note

    The password is the root password for the device. If you logged in to the device as root, you do not need to perform this step.

  5. Enter the following command on the device:
    root@device% dd if=/var/tmp/filename of=/dev/da0 bs=1048576


    The device writes the installation media image to the USB device:

  6. Log out of the shell:
    root@device% exit
    % exit
    user@device>

Chassis Component Alarm Conditions on QFX5120 Switches

This topic describes the chassis component alarm conditions on QFX5120 switches.

Table 2 lists the alarms that the chassis components can generate on QFX5120 switches, their severity levels, and the actions you can take to respond to them.

Table 2: Chassis Component Alarm Conditions on QFX5120 Switches

Chassis Component

Alarm Condition

Alarm Severity

Remedy

Power supplies

A power supply is removed from the chassis.

Major (red)

Install a power supply in the empty slot.

A power supply output has failed.

Major (red)

Check power supply output connection.

A power supply has failed.

Major (red)

Replace the failed power supply.

An unknown power supply is installed.

Major (red)

Install a power supply recommended by Juniper Networks.

Mix of power supplies with different airflow directions.

Major (red)

Do not mix power supplies with different directions for the airflow in the same chassis.

Fan modules

Fan module is not installed.

Major (red)

Install the fan module.

A fan module has failed.

Major (red)

Replace the fan module.

Mix of fan modules with different airflow directions.

Major (red)

Do not mix fan modules with different directions for the airflow in the same chassis.

Temperature

The temperature inside the chassis reaches the yellow or amber alarm limit.

Minor (yellow or amber)

  • Check the fan.

  • Open a support case using the Case Manager link at https://www.juniper.net/support/ or call 1-888-314-5822 (toll-free within the United States and Canada) or 1-408-745-9500 (from outside the United States).

The temperature inside the chassis reaches the red alarm limit.

Major (red)

  • Check the fan.

  • Open a support case using the Case Manager link at https://www.juniper.net/support/ or call 1-888-314-5822 (toll-free within the United States and Canada) or 1-408-745-9500 (from outside the United States).

Management Ethernet interface

Management Ethernet link is down

Major (red)

  • Check whether a cable is connected to the management Ethernet interface, or whether the cable is defective. Replace the cable if required.

  • If you are unable to resolve the problem, open a support case using the Case Manager link at https://www.juniper.net/support/ or call 1-888-314-5822 (toll-free within the United States and Canada) or 1-408-745-9500 (from outside the United States).

Routing Engine

Rescue configuration is not set.

Minor (yellow or amber)

Use the request system configuration rescue save command to set the rescue configuration.

Feature usage requires a license or the license for the feature usage has expired.

Minor (yellow or amber)

Install the required license for the feature specified in the alarm.