Extreme Networks ExtremeWare Version 7.8, Troubleshooting Manual

Page: 91 / 122

FDB Scan
Advanced System Diagnostics and Troubleshooting Guide 91
Viewing Diagnostics Results
Use the following commands to view information related to the FDB Scan diagnostic test:
show log
show diagnostics
show fdb remap
clear fdb remap
show switch
Example Log Messages for FDB Scan Diagnostic Failures
Look for the following types of messages in the log:
FDB Scan: max number of remaps (
num
) exceeded. Calling sys-health-check.
slot entry
This message indicates that the FDB scan cannot re-map any more FDB entries. The value num is the
maximum number of entries than can be remapped (should be 8), slot indicates the chassis slot, and
entry indicates the entry. The system health checker is invoked; the configured system health check
action will be taken.
If this error message appears many times on multiple slots, there might be a transceiver problem on
the master MSM. Run the transceiver diagnostics and check the results to determine whether the
MSM should be replaced.
FDB Scan: entry
entry
marked ‘remapped’
This message indicates that the diagnostic detected a corrupted portion of FDB memory, and that the
database entry
entry was marked as unusable by the FDB scan routine. The module can continue to
operate normally with no loss of performance. Do not replace the module.
FDB Scan: entry
entry
marked ‘suspect’
This message indicates that the diagnostic detected a corrupted portion of FDB memory, but could
not remap that memory portion because it contains an entry that cannot be removed and relearned
automatically (for example, a static database entry). Operator intervention is required to correct this
problem. Use the
show fdb remap
command to identify the suspect entry (suspect entries are
marked with an “S,” remapped entries are marked with an “R”) and then take the appropriate
action to resolve the problem.
Example FDB Scan Results from the show diagnostics Command
FDB Scan results
Cardstate NumFail NumScan Entry LastFailTime
slot 1 : Operational 0 62
slot 2 : Unknown
slot 3 : Unknown
slot 4 : Unknown
slot 5 : Unknown
slot 6 : Unknown
slot 7 : Operational 0 62
slot 8 : Operational 0 62
MSM-A : Operational 0 62
MSM-B : Operational 0 62