Troubleshooting guide

92 Advanced System Diagnostics and Troubleshooting Guide
Diagnostics
In the example output of the show diagnostics command, in those slots equipped with a module, a
non-zero value in the “NumFail” column indicates that a problem has been detected with FDB memory.
During the FDB scan, the test attempts to map an error location so that it will not be used. If that
location is in use, and the entry cannot be removed safely, FDB scan marks it as suspect (see the
description of the example log messages in
“Example Log Messages for FDB Scan Diagnostic Failures”
on page 91, and the show fdb remap command, below). If entries are marked “suspect,” then traffic
might be forwarded incorrectly for that specific entry (all other entries will be okay). Manually remove
the entry and allow FDB scan to remap it. If this is not possible, contact Extreme Network TAC.
Example Output from the show switch command
For an example of the show switch command display, see the “Example—show switch Command”
section on page 86. The output from this command will indicate whether FDB scanning is enabled and
will also indicate the failure action to be taken.
Example Output from the show fdb remap Command
Forwarding database remapped entries:
80fc0-206 FF:FF:FF:FF:FF:FF v1(4093) 0000 0000 Ss m CPU
80fc1-fff 00:E0:2B:FF:FF:FF [phone] RS m ---
80fc2-fff 00:E0:2B:FF:FF:FF [phone] RS m ---
80fc3-fff 00:E0:2B:FF:FF:FF [phone] RS m ---
Flags : d - Dynamic, s - Static, p - Permanent, m - Mac, i - IP,
x - IPX, l - lockdown MAC, M - Mirror, B - Egress Blackhole,
b - Ingress Blackhole, S - Suspect, R - Remapped.
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