The 802.11 MAC Counters can be accessed from the WLC GUI.
Click on Monitor > Access Points > 802.11b/g/n and then select Detail from the drop down menu on the far right hand side of each AP shown in the list.
At the bottom of this screen are the "802.11 MAC Counters" statistics and "Band Select” statistics
Counters
Tx Fragment Count
This counter is incremented for an acknowledged MPDU with an individual address in the address 1 field.
Tx Failed Count
This counter increments when an MSDU is successfully transmitted after one or more retransmissions.
Multiple Retry Count (Graphics view only)
This counter shall increment when an MSDU is successfully transmitted after more than one retransmission.
RTS Success Count
This counter increments when a CTS is received in response to an RTS.
ACK Failure Count
This counter increments when an ACK is not received when expected.
Multicast Rx Frame Count
This counter increments when a MSDU is received with the multicast bit set in the destination MAC address.
Tx Frame Count
This counter increments for each successfully transmitted MSDU.
Multicast Tx Frame Count
This counter increments only when the multicast bit is set in the destination MAC address of a successfully transmitted MSDU. When operating as a STA in an ESS, where these frames are directed to the access point, this implies having received an acknowledgment to all associated MPDUs.
Retry Count
This counter increments when an MSDU is successfully transmitted after one or more retransmissions.
Frame Duplicate Count
This counter increments when a frame is received that the Sequence Control field indicates is a duplicate.
RTS Failure Count
This counter increments when a CTS is not received in response to an RTS.
Rx Fragment Count
This counter shall be incremented for each successfully received MPDU of type Data or Management.
FCS Error Count
This counter increments when an FCS error is detected in a received MPDU.
WEP Undecryptable Count
This counter increments when a frame is received with the WEP subfield of the Frame Control field set to one and the WEPOn value for the key mapped to the TA's MAC address indicates that the frame should not have been encrypted or that frame is discarded due to the receiving STA not implementing the privacy option.
Band Select statistics
When the feature is activated, the WLC doesn't immediately reply to probe requests on 11b/g. If immediately a probe is also seen on 11a, then the client is detected as dual band. Then WLC only replies on 11a. After some time, this "categorization" expires and WLC will again try to see if the client is present on both bands.
Source: https://supportforums.cisco.com/thread/2045660?tstart=0
For More information, please visit
Wireless LAN Controller (WLC) Error and System Messages FAQ
http://www.cisco.com/en/US/products/ps6366/products_qanda_item09186a008082c464.shtml
Wireless LAN Controller (WLC) FAQ
http://www.cisco.com/en/US/products/ps6366/products_qanda_item09186a008064a991.shtml
