Cisco Systems OL-11497-03 manual Monitoring Critical, Major, and Minor Alarm Status

Chapter 4 Troubleshooting the Installation

Problem Solving with Subsystems

If there are no faults on the SFCs (SFC 0, SFC 1, or SFC 2), the green LED labeled ENABLED for each SFC should be on, and the yellow LED labeled FAIL for each SFC should be off. If the system detects an SFC fault, it turns off the green ENABLED LED for the faulty card, turns on the yellow FAIL LED, logs a warning message on the system console, and continues operating.

Monitoring Critical, Major, and Minor Alarm Status

The alarm card faceplate is equipped with three pairs of alarm status LEDs that are used to identify system alarm conditions detected through the MBus:

•Critical

•Major

•Minor

Note The LEDs are paired for redundancy to protect against a single failed LED. If any of the six LEDs is on, check the system console for messages describing the fault.

Because there are two alarm cards in a Cisco 12006 or Cisco 12406 Router, a system alarm condition detected through the MBus causes the same LEDs to be illuminated on both alarm cards.

The alarms can warn of an overtemperature condition on a component in one of the card cages, a fan failure in a blower module, an overcurrent condition in a power supply, or an out-of-tolerance voltage on one of the cards in one of the card cages. The LEDs are driven by MBus software, which sets the threshold levels for triggering the different stages of alarms.

The RP continuously polls the system for temperature, voltage, current, and fan speed values. If an over-threshold value is detected, the RP sets the appropriate alarm severity level on the alarm card, which lights one of the LED pairs on the alarm display and energizes the appropriate alarm display relays, activating any external audible or visual alarms wired to the alarm display. The RP also logs a message about the threshold violation on the system console.

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
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