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Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter5 Troubleshooting Problem Solving Using a Subsystems Approach
Identifying Startup Problems
Startup problems are commonly due to the source power or to a port adapter or service adapter that is
dislodged from the system board. Although an over temperature condition is unlikely at initial startup,
the environmental monitoring functions are included in this chapter because they also monitor internal
voltages.
When you start up the router for the first time, you should observe the startup sequence desc ribed in the
“Starting the System and Observing Initial Conditions” section on page3- 9 in Chapter 3, “Starting and
Configuring.” This section contains a more detailed description of the n orm al star tup seq ue nce an d
describes the steps to take if the system does not perform that sequence as expected.
LEDs indicate all system states in the startup sequence. By checking the state of the LEDs, you can
determine when and where the system failed in the startup sequence. Use the following descriptions to
isolate the problem to a subsystem, and then proceed to the appropriate sections to try to resolve the
problem.
When you start up the system by turning on the power supply switch, the following should occur:
•You should immediately hear the fans operating. If not, proceed to the “Troubleshooting the Cooling
Subsystem” section on page 5-5. If you determine that the power supply is functioning nor mally and
that a fan is faulty, contact a customer service representative. If a fan does not function properly at
initial startup, there are no installation adjustments that you should make.
•The STATUS LED should come on. As the system boots to ROM monitor state, the STATUS LED
is amber. The STATUS LED turns green when the system boots to the Cisco IOS state. If the system
does not boot properly, call your local service representative.
•The native GBIC ENABLE and 100 Mbps LEDs should come on as follows:
–
The 100 Mbps LED comes on and indicates that a Fast Ethern et port ( 0 o r 1 ) is in itia lize d a nd
enabled for operation by the system. This LED comes on during a successful router boot and
remains on during normal operation of the router. If this LED r emai ns off when yo u start t he
router, it is probably a problem with the Fast Ethernet port. Consult the table on page 5-2.
–
The GBIC ENABLE LED comes on and indicates that a GBIC port (0 or 1) is initialized and
enabled for operation by the system. This LED comes on during a successful router boot and
remains on during normal operation of the router.
If this LED remains off when you start the router, it is probably a problem with the Gigabit
Ethernet port. Consult the table on page 5-2.
–
The GBIC LINK LED comes on only when a router Gigabit Ethernet port (0 or 1) is receiving
a carrier signal from the network. This LED remains off during normal opera ti on o f the rout er
unless there is an incoming carrier signal, and does not indicate startup problems.
–
The FE LINK LED comes on only when a router Fast Ethe rnet port (0 or 1) is receiving a carrier
signal from the network. This LED remains off during normal operati on of t he r oute r unless
there is an incoming carrier signal, and does not indicate startup problems.
•The ENABLED LED on the port adapter or service a dapt er co mes on w hen the pr oces sor compl etes
its initialization of the adapter for operation. The ENABLED LED indicates that the adapter is
receiving power and has been recognized by the processor; it does not indic ate t he s ta te of t he
individual interfaces on the adapters. If an ENABLED LED fails to come on, proceed to the
“Upgrading the Boot Helper (Boot Loader) Image” section on page5-7.
•When all LEDs come on to indicate that the system has booted successfully, the initial system
banner should be displayed on the console screen. If it is not displayed, see Appendix A,
“Specifications,” the “Console and Auxiliary Port Signals and Pinouts” section on page A-8 to
verify that the terminal is set correctly and that it is properly connected to the console port.