Fail Safe Commands 241

 

 

 

Problems

Possible Cause

Solution

 

 

 

No connection and the

Incorrect Ethernet cable,

Check pinout and replace if necessary

port LED is off

e.g., crossed rather than

 

 

straight cable, or vice

 

 

versa, split pair (incorrect

 

 

twisting of pairs)

 

 

Fiber optical cable

Change if necessary. Check Rx and Tx on fiber optic

 

connection is reversed

cable

 

Bad cable

Replace with a tested cable

 

Wrong cable type

Verify that all 100 Mbps connections use a Cat 5 cable

 

 

 

Lost Password

 

See “Fail Safe Commands”on page 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:

1Connect to the console interface as described in “Command Line Interface Management” on page 22.

2Reboot the switch.

3After 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.

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3Com 3CRDSF9PWR manual Problems Possible Cause Solution