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Troubleshooting the ACX4000 Router

 

Troubleshooting Resources for ACX4000 Routers

Command-Line Interface

The Junos OS command-line interface (CLI) is the primary tool for controlling and troubleshooting router hardware, the Junos OS, routing protocols, and network connectivity. CLI commands display information from routing tables, information specific to routing protocols, and information about network connectivity derived from the ping and traceroute utilities.

You enter CLI commands on one or more external management devices connected to ports on the front panel.

For information about using the CLI to troubleshoot the Junos OS, see the appropriate Junos OS configuration guide.

Front Panel LEDs

The front panel on the router contains LEDs that allow you to troubleshoot the router.

LEDs on the front panel include the following:

  • System LED—One LED labeled SYS on the right side of the front panel indicates the status of the router.

  • Management and console port LEDs—Two pairs of LEDs on the front panel indicate the status of the ports. The ports are labeled MGMT and CONSOLE/AUX.

  • Link LEDs—Each network port has one pair of port LEDs that indicate the status of the ports.

For more information on front panel LEDs, see ACX4000 LEDs Overview.

Monitoring System Log Messages

Purpose

Use the monitoring functionality to view system log messages for ACX Series routers.

Action

To view events in the CLI, enter the show log command. For more information see Displaying a Log File from a Single-Chassis System.

Understanding Alarm Types and Severity Classes on ACX Series Routers

Before monitoring alarms on the router, become familiar with the terms defined in Table 1.

Table 1: Alarm Terms

Term

Definition

Alarm

Signal alerting you to conditions that might prevent normal operation. On a router, the alarm signal is the red system LED lit on the front of the chassis.

Alarm condition

Failure event that triggers an alarm.

Alarm severity

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

Chassis alarm

Predefined alarm triggered by a physical condition on the router, such as a power failure, excessive component temperature, or media failure.

System alarm

Predefined alarm triggered by a missing rescue configuration or failure to install a license for a licensed software feature.

Alarm Types

The router supports these alarms:

  • Chassis alarms indicate a failure on the router or one of its components. Chassis alarms are preset and cannot be modified.

  • System alarms indicate a missing rescue configuration. System alarms are preset and cannot be modified, although you can configure them to appear automatically in the J-Web interface display or CLI display.

Alarm Severity Classes

Alarms on ACX Series routers have two severity classes:

  • Major (steady red)—Indicates a critical situation on the router 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 (blinking red)—Indicates a noncritical condition on the router that, if left unchecked, might cause an interruption in service or degradation in performance. A minor alarm condition requires monitoring or maintenance.

    A missing rescue configuration generates a minor system alarm.

Verifying Active Alarms

Purpose

Use the monitoring functionality to view alarm information for the ACX Series routers, including alarm type, alarm severity, and a brief description for each active alarm on the router.

Action

  • Observe the system LED on the front panel of the router. If the router is functioning normally with no alarms, the system LED lights green steadily.

  • Issue the show chassis alarms command to verify the status of router. As shown in the sample output, the value Class indicates the severity of the alarm.

    user@host> show chassis alarms

    When the router is functioning normally with no active alarms, the CLI displays the output as shown:

    user@host> show chassis alarms

Meaning

Table 2 lists the alarm output fields.

Table 2: Alarm Output Fields

Field

Values

Alarm time

Date and time when the failure was detected.

Class

Alarm severity—either major or minor.

Description

Brief synopsis of the alarm.