Enterasys Networks Fast Network 10 Software Checksum Comparison, Power-up Diagnostics Results

Responses to Failures at Power-up

6.1.3 Software Checksum Comparison

When the FN10 reboots, its operational software is verified by a checksum comparison before it is loaded. If the software fails the checksum test due to an interrupted new software distribution procedure, the FN10 will automatically use its backup version of software. A backup version of software is always stored in non-volatile memory.

The operational parameters of the FN10 software are also protected by a checksum comparison. When the FN10 reboots, if the operational parameters of the FN10 fail a checksum test due to a power failure in the midst of a previous update, the FN10 automatically uses its backup version of the parameters.

NOTE

A backup version of the operational parameters is always stored in non-volatile memory before any update is attempted.

6.1.4 Power-up Diagnostics Results

After completion of the power-up diagnostic sequence, both the Power (Pwr) and Ready LEDs located on the front panel of the FN10 should be on.

6.2 RESPONSES TO FAILURES AT POWER-UP

How the FN10 responds to failures detected during power-up depends on the seriousness of the failure. For example, the FN10 will operate if a non-critical component, such as the out-of-band management port, fails diagnostics. However, in the event of a critical failure, such as a failure of the main element processor, the FN10 will halt execution and will not boot to operational mode.

6.3 DIAGNOSTIC LOOPBACK TESTS

You can perform local and remote loopback tests on any Ethernet port while the FN10 is operational.

Fast Network 10 User Guide Page 6-3