Enterasys atx Betriebsanweisung

7-4

Diagnostics and Troubleshooting

When the ATX reboots, its operational software is verified by a 
checksum comparison before it is loaded. If the software fails the 
checksum test due to an aborted new software distribution 
procedure, the ATX will automatically use its backup version of 
software. (A backup version of software is always stored in 
nonvolatile memory.) 

The operational parameters of the ATX software are also protected 
by a checksum comparison. When the ATX reboots, if the 
operational parameters of the ATX fail a checksum test due to a 
power failure in the midst of a previous update, the ATX will 
automatically use its backup version of the parameters. (A backup 
version of the operational parameters is always stored in 
nonvolatile memory before any update is attempted.)

After completion of the power-up diagnostic sequence, all STATUS 
LEDs on the ATX front panel should be on, indicating that the 
modules have passed the power-up tests.

How the ATX responds to failures detected during power-up 
depends on the seriousness of the failure. For example, a failure 
detected on an interface module will not prevent the ATX from 
booting; it will only cause the particular interface module to go out 
of service. If an interface module fails power-up diagnostics, it is 
automatically disabled. The rest of the ATX system will continue to 
operate. Similarly, the ATX will operate if a non-critical component 
such as the out-of-band management port on the PPE fails 
diagnostics.

However, in the event of a critical failure such as a failure of the 
main element processor, local RAM or SRAM, the ATX will halt 
execution and will not boot to operational mode.