Chapter 4 Troubleshooting the Installation
Problem Solving with Subsystems
4-34
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
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.