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Appendix B Troubleshooting
441
Why won’t the Telnet workstation access the device?
• Check that the device IP address, subnet mask and default gateway
are configured correctly, and that the device has been reset.
• Ensure that you enter the IP address of the switch correctly when
invoking the Telnet facility.
• Check that Telnet access was not disabled for the switch. If you
attempt to log in and the maximum number of Telnet sessions are
being used, you should receive an error message indicating so.
Why is it that traps are not received by the SNMP Network
Manager?
• Check that the SNMP Network Manager's IP address and
community string are configured correctly
• Check that the IP address of the Trap Receiver is configured
properly on the system.
The SNMP Network Manager or Telnet workstation can no
longer access the device. Why?
• 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 succeed, a
problem with the original port is indicated. Examine the
connections and cabling.
• A network problem may be blocking your access to 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.
Why do permanent entries remain in the Forwarding Database
(FDB)?
• If you have made a permanent entry in the FDB (which requires
you to specify the VLAN where it belongs and then delete the
VLAN), the FDB entry will remain. Though harmless, you must
manually delete the entry from the FDB if you want to remove it.