Chapter 5 Troubleshooting the Installation
Troubleshooting Overview
Locating the Serial Number on Your Router
The serial number label is located on the input/output (I/O) side,
The serial number format is: 3 letters, 4 numbers, and 4 characters (combination of letters and numbers)
See Figure
Figure 5-1 Serial Number Location
Problem Solving Using a Subsystems Approach
The key to solving problems with the system is isolating the problem to a specific subsystem. The first step in solving startup problems is to compare what the system is doing to what it should be doing. Because a startup problem is usually caused by a single component, it is more efficient to first isolate the problem to a subsystem rather than to troubleshoot each component in the system. For these troubleshooting procedures, consider the following subsystems:
•Power
•Processor
•Cooling
The following sections help you isolate a problem to one of these subsystems and direct you to the appropriate troubleshooting section.
Identifying Startup Problems
Startup problems are commonly due to the source power or to a port adapter that is dislodged from the router. Although an overtemperature 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 described in the “Starting the System” section on page
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. See Figure
Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide
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