Cabletron Systems SmartSTACK 10 ELS10-26, User Manual

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5-2
ELS10-26 Diagnostics and Troubleshooting
5. After several more seconds, the CPU LED will stay on,
indicating that the power-up diagnostics sequence is
complete.
In addition, the Port Link LEDs will turn on for those ports
with good links and the Segment Status LEDs will turn on (or
flash) when the selected status condition is present.
5.1.2 Specific Power-up Tests
The power-up diagnostic tests performed on the ELS10-26 include:
• ROM checksum test
• Instruction/Data memory test
• FLASH checksum test
• NVRAM checksum test
• Ethernet data loopback test
5.1.3 Software Checksum Comparison
When the ELS10-26 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 ELS10-26 will automatically use its backup version
of software. A backup version of software is always stored in non-
volatile memory.
Note: If a critical component fails diagnostics, the CPU LED will turn off
and the ELS10-26 will attempt to reboot. If the CPU LED does not
stay on, contact Cabletron Systems Global Call Center. Refer to
Section 1.2.