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Troubleshooting
Flowchart 1: Link Level Tests
Appendix A 61
Flowchart 1a Procedures
• Execute linkloop to remote host. If linkloop is successful, continue
to Network Test. Else if linkloop fails note which error was returned.
• If loopback failed error = “Address has bad format” or “not an
individual address” then correct the link level address with the
proper station address format/value and repeat the Link Level Test.
• Otherwise, loopback failed because the remote host did not respond.
Double check the remote host address and VLAN ID, or choose
another remote host and re-execute linkloop.
— Ensure VLAN IDs are the same by using lanadmin -V scan on
both the source and destination.
— Ensure switches along the path are configured with the correct
VLAN ID and marked “tagged” or “untagged” as appropriate.
— Ensure MTUs match as well.
— Ensure that link parameters for autonegotiation, flow control
speed and duplexity are compatible.
— Ensure that the link is up. Refer to the documentation for each
specific link for details.
If linkloop is successful, continue to Network Test. You may also
want to contact the node manager of the remote that did not respond
(if this was the case).