Allied Telesis AT-8550 - Manual (Page 248)

Using the Command-Line Interface
B-4
The SNMP Network Manager or Telnet workstation can no longer
access the device:
Check that Telnet access or SNMP access is enabled.
Check that the port through which you are trying to access the
device has not been disabled. If it is enabled, check the connections
and network cabling at the port.
Check that the port through which you are trying to access the
device is in a correctly configured VLAN.
Try accessing the device through a different port. If you can now
access the device, a problem with the original port is indicated. Re-
examine the connections and cabling.
A network problem may be preventing you accessing the device
over the network. Try accessing the device through the console port.
Check that the community strings configured for the device and the
Network Manager are the same.
Check that SNMP access was not disabled for the system.
Permanent entries remain in the FDB:
If you have made a permanent entry in the FDB (which requires you
to specify the VLAN to which it belongs and then delete the VLAN),
the FDB entry will remain. Though causing no harm, you must
manually delete the entry from the FDB if you want to remove it.
Default and Static Routes:
If you have defined static or default routes, those routes will remain
in the configuration independent of whether the VLAN and VLAN IP
address that used them remains. You should manually delete the
routes if no VLAN IP address is capable of using them.
You forget your password and cannot log in:
If you are not an administrator, another user having administrator
access level can log in, delete your user name, and create a new user
name for you, with a new password.
Alternatively, another user having administrator access level can log
in and initialize the device. This will return all configuration
information (including passwords) to the initial values.
In the case where no one knows a password for an administrator
level user, contact your supplier.