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CISCO-DOT11-ASSOCIATION-MIB (Cisco Air AP 1140) For Determining Client's Radio Type

We are using the CISCO-DOT11-ASSOCIATION-MIB in a Cisco Air AP 1140 device with release 12/4(21a)JA1 to find out the radio type of wireless client (B/G or N).  The clients in question are of type Wireless N and  Wireless B/G.  We are querying cDot11ClientDevType and cDot11ClientRadioType but the relation between the returned values and client/radio type is not clear:

  • 2 devices returned: cDot11ClientDevType = 102 ==> pc4500Client(102) - client with a 4500 radio and ClientRadioType=2==> ccxClient(2) - CCX-compatible radio
  • 1 device returned: cDot11ClientDevType = 1==> unknown (1) – unknown and ClientRadioType= 1==> unknown(1)

Questions: On a Cisco Air AP 1140 device

  • What OID needs to be polled to find if the client's radio type?
  • What value is returned by this OID  if the radio type is B/G?
  • What value is returned by this OID  if the radio type is N?

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CISCO-DOT11-ASSOCIATION-MIB (Cisco Air AP 1140) For Determining

The 'cDot11ClientRadioType' OID from the 'CISCO-DOT11-ASSOCIATION-MIB' MIB gives information about the clients that are Cisco devices. 

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&typeName=CDot11ClientRadioType

The values given for the cDot11ClientRadioType are all for Cisco devices. If the client is a non-cisco device then, the value for 'cDot11ClientRadioType' will either be 'unknown' or 'ccx-client' (CCX-compatible radio). 

There is no way from the AP side to determine what the specific client hardware model is, or what its capabilities are if it is a non-cisco device. You can gather the MAC address of the client and its first 3 bytes will tell you the manufacturer of the client, but NOT its model or radio capabilities.

If the AP is managed by the controller, then the AIRESPACE-WIRELESS-MIB mib has the following OID that will be helpful. The 'bsnMobileStationProtocol' gives what protocol (dot11a/b/g) is being used by the client. This does not recognize clients with N type radio and will return 'unknown' for them.

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&objectInput=1.3.6.1.4.1.14179.2.1.4.1.25#oidContent
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