On any of my 2501's or 2502's, I activate "debug cdp adjacency" or "debug cdp events" shortly after booting up. I see no debug output when a new cdp neighbor comes online; neither before nor after that neighbor appears in the sh cdp neighbors command.
Also I can do a debug ip ospf events and it will notify me of every single hello packet going out. I don't consider a hello packet to be an "event." An "event" is like a Zeppelin concert or something of that magnitude.
Isn't there a way to keep something as mundane as hello traffic out of the debug output?
And, is there something wrong with the cdp facilities on these routers that they don't announce new adjacencies when they are asked to?