We currently have a large deployment of 1131ag APs and we are moving to 1142 APs in the future for new installs/replacements. I thought I read somewhere that it was not advisable to mix 802.11a/g and 802.11a/g/n APs in the same area because it could cause roaming issues for clients. Can anybody confirm this is or not the case?
The controller 802.11n configuration is setup in mixed-mode and using 20Mhz channel widths.
We have 450x 1142abgn and 250x 1131abg well mixed in over 30 buildings and its fine.
Obviously 802.11n clients will connect to an 802.11n signal if they see a strong one, in preference to an equally strong 802.11abg signal from an 802.11abg only access point nearby, but it all works fine.
(currently peak at 2500 concurrent users and 7000 unique users per day).