Cabletron Systems SmartSwitch 9A100, User Manual, Page: 75 / 114

SmartSwitch 9A100 User Guide 5-1
5 TROUBLESHOOTING
This chapter provides basic troubleshooting for diagnosing and fixing problems with VLAN, emulated LANs, and
ATM traffic congestion.
5.1 TROUBLESHOOTING IP OVER ATM
You have configured an IP over ATM VLAN, but your network applications are not working. Use these questions and
tests to help determine the cause of the problem.
1. Check for connectivity: Try pinging between end nodes and from the SmartSwitch 9A100 (using
start ping
) to its end nodes. If you cannot ping, check physical connectivity (disconnected cable
and so on).
2. Check IP routes and addresses.
•
Use the
show route
command to check the SmartSwitch 9A100 route table.
-
Are the destination addresses correct for the specified gateways?
-
Are there any routing loops?
-
Are one or more of the destination addresses mapped to the wrong subnet?
•
Use
show client
(ARP server is on SmartSwitch 9A100) to check the local client.
-
Does the client have the correct IP address?
-
Is the subnet correct? Is the ATM address correct?
-
Is the server type correct?
•
Check end node configurations.
-
Are end nodes configured correctly?
3. Check ARP statistics.
•
Use
show ipatmarp
(if the ARP server is on the SmartSwitch 9A100).
-
Are there entries in the table?
-
Are the ATM addresses correct?
•
Use
show clientarp
(ARP server is not on SmartSwitch 9A100) to check local client’s ARP Table.
-
Are there entries in the table? If not, recheck client and end node configuration.
-
Are the ATM addresses correct?