Troubleshooting The I/O Subsystem; Troubleshooting The Processor Subsystem; Troubleshooting The Port Adapter Or Service Adapter - Cisco 7401ASR Installation And Configuration Manual

Problem Solving Using a Subsystems Approach

Troubleshooting the I/O Subsystem

The procedures in this section assume that you have not made changes to your configuration file.
If the Cisco 7401ASR router I/O LEDs do not go on as expected (see the
section on page
Table 5-3 Troubleshooting the I/O Subsystem
Symptom
LEDs remain off when the system power
switch is turned on.
Power supply and fans appear
operational, but none of the I/O LEDs
are on.
The prior configuration—native Gigabit
Ethernet or the Fast
Ethernet/Ethernet—LEDs remain on
after configuring the ports to change the
configuration from one Ethernet type to
the other.

Troubleshooting the Processor Subsystem

The processor subsystem comprises the system board and the port adapter. A port adapter that is partially
connected to the system board sends incomplete signals to the processor, which faults the PCI bus and
causes the system to pause indefinitely. Therefore, first ensure that the system software has initialized
successfully and then check to see if the port adapter is fully connected.

Troubleshooting the Port Adapter or Service Adapter

Check the following to help isolate a problem with the port adapter or service adapter:
Table 5-4 Troubleshooting the Port Adapter or Service Adapter
Symptom Possible Cause
Port adapter or The port adapter or
service adapter service adapter might
ENABLE LED is have pulled away
off. from the system
board.
Cisco 7401ASR Installation and Configuration Guide
5-6
5-3), check the following items to help isolate the problem:
Possible Cause
Power supply or
cooling subsystem is
faulty.
The improperly
connected port
adapter has
indefinitely paused
the system.
The media-type
command was not
used when changing
the configuration of
these ports.
Possible Solution
Reseat the adapter in its slot (you do not have to turn off the system power when
removing or replacing port adapter and service adapters). After the system
reinitializes the interfaces, the ENABLE LED on the port adapter or service
adapter should go on.
If the ENABLE LED remains off, the system detected a processor hardware
failure. (This LED should be on in normal operation.) Contact a service
representative for instructions.
Possible Solution
If the LEDs stay off, first see the
Power Subsystem" section on page 5-4
"Troubleshooting the Cooling Subsystem" section on
page 5-5 to ensure that both the fans and the power supply
are functioning properly.
Reseat the port adapter, tighten the screw of the port
adapter latch, and then restart the system.
See Chapter 3, "Starting and Configuring,"
"Configuring the Native Gigabit Ethernet and Fast
Ethernet/Ethernet Interfaces" section on page
Chapter 5 Troubleshooting
"Identifying Startup Problems"
"Troubleshooting the
and the
the
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