Cabletron Systems SmartCell 6A000 - Manual (Page 59)

SmartCell 6A000 User Guide 5-1
5 TROUBLESHOOTING
This chapter provides basic troubleshooting for diagnosing and fixing problems with VLANs, emulated LANs, and
ATM traffic congestion.
Note To turn off most of the error message display on the console screen, enter the set
logprint off command.
5.1 TROUBLESHOOTING IP OVER ATM
If 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 SmartCell 6A000
(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 SmartCell 6A000 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 SmartCell 6A000) 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 SmartCell 6A000).
- Are there entries in the table?
- Are the ATM addresses correct?
• Use show clientarp (if the ARP server is not on the SmartCell 6A000) 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?