Example - Avaya Wireless AP-3 User Manual

Filtering
Taken together, a MAC Address/Mask pair specifies an address or a
range of MAC addresses that the AP will look for when examining
packets. The AP uses Boolean logic to perform an "AND" operation
between the MAC Address and the Mask at the bit level. However, for
most users, you do not need to think in terms of bits. It should be sufficient
to create a filter using only the hexadecimal digits 0 and F in the Mask
(where 0 is any value and F is the value specified in the MAC address). A
Mask of 00:00:00:00:00:00 corresponds to all MAC addresses, and a
Mask of FF:FF:FF:FF:FF:FF applies only to the specified MAC Address.

Example

For example, if the MAC Address is 00:20:A6:12:54:C3 and the Mask is
FF:FF:FF:00:00:00, the AP will examine the source and destination
addresses of each packet looking for any MAC address starting with
00:20:A6. If the Mask is FF:FF:FF:FF:FF:FF, the AP will only look for the
specific MAC address (in this case, 00:20:A6:12:54:C3).
Avaya Wireless AP-3 User's Guide 4-65