3Com 3800 - Manual (Page 163)

Using the Command-Line Interface C-3
Traps are not received by the SNMP Network Manager:
Check that the SNMP Network Manager's IP address and community
string are correctly configured and that the IP address of the Trap
Receiver is configured properly on the Switch.
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.
There may be a network problem preventing you accessing the device
over the network. Try accessing the device through the console port.
Check that the community strings configured for the Switch and the
network manager are the same.
Check that SNMP access was not disabled for the Switch.
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 wish 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.
SW3800.BK Page 3 Tuesday, May 5, 1998 5:20 PM