3Com 3CRDSF9PWR manual Problems Possible Cause Solution

		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.