Here's the situation:
We had an AP that had a BVI address of 10.1.1.5. There was also an address on FA0 and D0 of 10.1.1.5. We needed to add a second address on the AP, but couldn't. (Option was there but wouldn't take.) So, we changed the address on the BVI to what we needed while connected to the 10.1.1.5 address.
Now at this point I have:
BVI - 10.100.100.5
FA0 - 10.1.1.5
I can still move around on the FA0 telnet session, and I can telnet to the new address. Can someone explain how this was possible?