3Com 3CRDSF9PWR-US - OfficeConnect Managed Fast Ethernet PoE..., User Manual

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Fail Safe Commands 241
Fail Safe Commands
If the switch does not operate normally or if the firmware becomes
corrupted, you can reset the switch and use the fail safe commands to
resume operation by restoring the factory defaults, restoring the default
user name and password, or downloading new firmware.
To enter fail safe mode:
1 Connect to the console interface as described in “Command Line
Interface Management” on page 22.
2 Reboot the switch.
3 After the power-on self test completes and the runtime image finishes
loading, the following message is displayed:.
Press Ctrl+C within 5 seconds to get into FailSafe mode
At this point, press Ctrl-C and wait for the remainder of the switch
initialization to complete.
You will then be presented with options listed below.
■
initialize – Deletes all stored configuration information, including IP
address and address configuration mode, user names, and passwords.
It then resets the switch to factory default settings, and restarts the
system.
Resetting the switch to factory defaults erases all your settings. You
will need to reconfigure the switch after you reset it.
■
password recovery – Deletes all user names and passwords, restores
the default user names and passwords – “admin” with no password,
and “monitor” with the same password, and then restarts the system.
No connection and the
port LED is off Incorrect Ethernet cable,
e.g., crossed rather than
straight cable, or vice
versa, split pair (incorrect
twisting of pairs)
Fiber optical cable
connection is reversed
Bad cable
Wrong cable type
Check pinout and replace if necessary
Change if necessary. Check Rx and Tx on fiber optic
cable
Replace with a tested cable
Verify that all 100 Mbps connections use a Cat 5 cable
Lost Password See “Fail Safe Commands”on page 241.
Problems Possible Cause Solution