Hi Naor,
If you are looking at allowing only so many users to associate to an AP at one time you can use the max-Associations command.
If you are trying to allow only certain users (mac) to access the AP you can use mac filters. Examples for both are listed below;
This example shows how to:
Name an SSID
Configure the SSID for RADIUS accounting
Set the maximum number of client devices that can associate using this SSID to 15
Assign the SSID to a VLAN
AP# configure terminal
AP(config)# interface dot11radio 0
AP(config-if)# ssid batman
AP(config-ssid)# accounting accounting-method-list
AP(config-ssid)# max-associations 15
AP(config-ssid)# vlan 3762
AP(config-ssid)# end
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_guide_chapter09186a00802085c4.html
Configuring and Enabling MAC Address Filters
MAC address filters allow or disallow the forwarding of unicast and multicast packets either sent from or addressed to specific MAC addresses. You can create a filter that passes traffic to all MAC addresses except those you specify, or you can create a filter that blocks traffic to all MAC addresses except those you specify. You can apply the filters you create to either or both the Ethernet and radio ports and to either or both incoming and outgoing packets.
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_guide_chapter09186a00802091c1.html#wp1034897
Hope this helps!
Rob
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