I'm running a 7962 and it does not have AC...I'm looking to deny B, G and A clients.
Page 128 of the 9.8.1 users guide seems to say that I should be able to restrict to just one client type:
The wireless mode options include the following:
• Auto-Select: Allows both 802.11g- and 802.11b-compliant
devices to connect to the network. This is the default setting.
• 2.4GHz 54 Mbps (For faster 802.11g devices only): Allows
only 802.11g-compliant devices to join the network.
• 2.4GHz 11Mbps (For slower 802.11b devices only): Allows
only 802.11b-compliant devices to join the network.
There's a few other threads here saying the best you can do is disable dsss/cck. On a solo 7962 you can do this with set ofdm-only wlanx enable (get wlanlist will show you the mappings between wlanID and ssid)