Hi! We have cisco wireless network throught the whole 8-floor building on Cisco WLC 4402 and Cisco LAP-1242 AP. There are no coverage holes, but sometimes clients are flapping between two access points at different floors with serious loss in throughput. Is there any method to limit roaming between different floors in the building?
First of all your design should take in consideration that coverage among floors be at minimum! you should always try to design the APs so signal from APs on same floor are stronger than APs signal in up/down floors.
You can use different SSID name for different floors. This will absolutely stop roaming among floors.
you can name them like: Floor1SSID, Floor2SSID...etc.
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We have only one WLC and coverage is full. Client could be far closer to the AP on the same floor, but anyway switch to another floor AP. May it be the reason because there are different amount assotiated clients on the APs on different floors?
SSID naming for each floor is very unconvinient solution for us, because we have PSK auth. I`ve turned on the global assign power levels and channels future on the WLC. we`ll see the results tomorrow.
Is your deployment very congested that you've many APs than required. if you're using RRM it can be easily checked using the AP picked power levels, if the affected area got multiple neighbors with power levels *5 & above then you need to shut off couple of AP's radio or disable lower datarate.
The question I haven't seen asked, what type of clients are having this issues? Clients DICTATE roaming.
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