Actually 1242 APs will connect to 1522 APs in a mesh configuration, however the 1242s will prefer another 1242 and only connect to a 1522 RAP if they have to. I'm not sure why Cisco did this, because 1522s are expensive, bulky, and hard to power. We're using 1242s as MAPs and 1522s as RAPs in a couple of situations and they work fairly well, although if Cisco would remove the software block on 1242s preferring a 1522 as a parent it would work a lot better. Spanning-tree portfast not being disabled on the switch port where a mesh AP is connected will cause the ports to err-disable on one end when two mesh APs link up.
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