Problem Solving
2–5
Once the core test establishes that the hardware can perform basic operations, more
extensive tests for the logic modules are executed. When the entire self-test is com-
plete (approximately 1 minute), FRU pass/fail indications are given by the state of
the indicators on the I/O panel. If the diagnostics detect no fatal errors, the operation-
al firmware is called to begin normal bridge operation.
The self-test diagnostics can be initiated in any of three ways:
•
Locally by turning the ac power off for greater than 15 seconds, then back on
•
Remotely through the network management software
•
Internally by the operational firmware
The self-test diagnostics have two modes of operation: normal mode and manufac-
turing mode. These modes are selectable by configuration switch 1 on the I/O panel
(see Chapter 4). Only normal mode should be used in the field. Manufacturing
mode is designed for use in a manufacturing environment or repair station.
2.4 Recommended Approach to Problem Solving
Once you determine that a fault exists in the bridge hardware, you can approach the
problem-solving task as follows:
1. Rerun the self-test diagnostics to verify the failure.
2. Visually inspect the bridge.
3. Check the state of the LEDs on the bridge for fault indications.
4. Perform port testing, if necessary.
NOTE
The system/network manager should always keep a re-
cord of current bridge management parameters. This
makes it possible to recover parameters that may be lost
if an NVRAM reset occurs during problem solving. Re-
cording bridge parameters requires access to a network
node that contains network management software.
