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I'm actually teaching protection right now in class. :)

There are three ways an AP will go into protection:

- An 11b device associates to the AP.
- An 11b AP on the same channel can be heard by the AP
- The AP hears an 11g AP that is in protection because of an 11b device associated.

The last statement is the hardest to explain, so here is further explanation:

11g AP goes into protection because of an 11b device associated. That AP will set the bits in the beacon as follows:

Non-ERP (11b) Present: 1 = Yes
Use Protection: 1 = Yes

An 11g AP that hears that will go into protection and have the following Beacon bits:

Non-ERP (11b) Present: 0 = No
Use Protection: 1 = Yes

Now, lets say another 11g AP heard the one above. It will not go into protection because the one it heard does not have the Non-ERP Present bit on.

Let me know if there is anything else I can do!

Gene