Interpretations of 802.11 counters report on WCS
Dear Sir,
My customer recently deployed WLCs and WCS in their environment. However, recently they experienced slow performance. To futher finding out the root cause, I generated the 802.11 counters report from the WCS and noticed the following parameters is shown.
Tx/Rx Fragment Count/Sec and FCS Error Count/Sec
1. Can I make the assumptions that the overall transfer of packet rate in that interval is the Total of Tx/Rx Fragment Count/Sec and FCS Error Count/Sec?
2. If the output rate of Tx/Rx Fragment Count/Sec and FCS Error Count/Sec are the same, does it mean that 50% of the packet are corrupted and this high FCA Error Count/Sec will cause performance degradation to the wireless througphput?
3. What is the baseline of the FCS Error Count/Sec that is acceptable? As for the case with wired, 1% error rate is acceptable. Will wireless have the same baseline?
Thanks
-delon
FCS error count is the number of frames that were transmitted/received with a bad checksum (CRC value) in the ethernet frame. These frames are dropped and not propagated onto other ports. Usually we check FCS errors at the asic level so they never even hit the backplane. Few of these errors are OK, but could also be an indication of bad cables, NICs,etc.
Catalyst keeps track of Tranmit FCS and Receive FCS. The Receive FCS is normal since its coming from the cable, Transmit FCS errors, however, should not occur and are an indication of bad hardware in the Catalyst. The FCS counter is a sum of Tx and Rx FCS errors.
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Generated: Thu Jul 07 10:13:21 EDT 2011
Report By: AP By Controller
Access Point: XX.XX.199.140 -> h2200-8-lap1131-1;h2200-8-lap1131-2;h2200-8-lap1131-3;h2200-8-lap1131-4
Reporting Period: Last 7 days
Coverage Holes in the Network
Time
State
AP Name
Radio Type
Failed Clients
Total Clients
Worst Client RSSI
07/06/2011 10:29:46 EDT
Clear
h2200-8-lap1131-1
802.11b/g
0
0
0
07/06/2011 10:24:09 EDT
Active
h2200-8-lap1131-1
802.11b/g
0
0
0
07/04/2011 14:13:03 EDT
Clear
h2200-8-lap1131-1
802.11b/g
0
0
0
07/04/2011 14:08:01 EDT
Active
h2200-8-lap1131-1
802.11b/g
0
0
0
06/30/2011 14:22:03 EDT
Clear
h2200-8-lap1131-1
802.11a
0
0
0
06/30/2011 14:17:01 EDT
Active
h2200-8-lap1131-1
802.11a
0
0
0
07/07/2011 10:12:33 EDT
Active
h2200-8-lap1131-3
802.11b/g
0
0
0
07/06/2011 15:15:36 EDT
Clear
h2200-8-lap1131-3
802.11b/g
0
0
0
07/06/2011 15:05:31 EDT
Active
h2200-8-lap1131-3
802.11b/g
0
0
0
07/06/2011 14:14:21 EDT
Clear
h2200-8-lap1131-3
802.11b/g
0
0
0
07/06/2011 14:09:12 EDT
Active
h2200-8-lap1131-3
802.11b/g
0
0
0
07/06/2011 11:15:40 EDT
Clear
h2200-8-lap1131-3
802.11b/g
0
0
0
Page 1 of
3
Time
State
AP Name
Radio Type
Failed Clients
Total Clients
Worst Client RSSI
07/06/2011 11:10:37 EDT
Active
h2200-8-lap1131-3
802.11b/g
0
0
0
07/06/2011 10:49:57 EDT
Clear
h2200-8-lap1131-3
802.11b/g
0
0
0
07/06/2011 10:44:54 EDT
Active
h2200-8-lap1131-3
802.11b/g
0
0
0
07/05/2011 14:24:46 EDT
Clear
h2200-8-lap1131-3
802.11b/g
0
0
0
07/05/2011 13:57:24 EDT
Active
h2200-8-lap1131-3
802.11b/g
0
0
0
07/04/2011 14:18:06 EDT
Clear
h2200-8-lap1131-3
802.11b/g
0
0
0
07/04/2011 14:13:03 EDT
Active
h2200-8-lap1131-3
802.11b/g
0
0
0
06/30/2011 14:53:01 EDT
Clear
h2200-8-lap1131-3
802.11a
0
0
0
06/30/2011 14:47:59 EDT
Active
h2200-8-lap1131-3
802.11a
0
0
0
07/06/2011 15:50:58 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/06/2011 15:40:53 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
07/06/2011 15:00:28 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/06/2011 14:55:17 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
07/06/2011 14:50:14 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/06/2011 14:45:11 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
07/06/2011 11:10:37 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/06/2011 11:05:34 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
Page 2 of
3
Time
State
AP Name
Radio Type
Failed Clients
Total Clients
Worst Client RSSI
07/04/2011 14:43:21 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/04/2011 14:38:19 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
07/04/2011 13:57:55 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/04/2011 13:52:52 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
07/04/2011 12:27:00 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/04/2011 12:21:56 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
07/04/2011 11:21:21 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
07/04/2011 11:16:19 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
06/30/2011 16:55:16 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
06/30/2011 16:50:13 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
06/30/2011 15:49:02 EDT
Clear
h2200-8-lap1131-4
802.11b/g
0
0
0
06/30/2011 15:33:36 EDT
Active
h2200-8-lap1131-4
802.11b/g
0
0
0
Page 3 of
3What is exactly a coverage hole ?
If the WLC detects that a client is on an AP with a bad signal strength and stick with that AP, it notes it down. that means there is no other AP to roam to logically.
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LancellotHi,
The report expires when it is scheduled report and configured for some specific time. After the time passed the report expires. re-schedule the report time and change the start-date time of the schedule and that should resolve your issue.
HTH
Amjad
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