WLC(s): are "forwarding" broadcast pkts when I don't want them to.

The symptom is whenever a wireless clients generates a broadcast packet the WLCs pick it up and send it(capwap encapsulated) to each and every AP(Unicast) in every building. Such that a single client broadcast packet causes our WLCs to generate 1000 separate packets.
We have multiple buildings(20) connected by VPN's over cable modems. Each building has ~25+ APs all set to Flex-Connect and local switching. Back here at central we have several 5508 WLCs.
We have broadcast forwarding disabled.
Show Network Summary
Ethernet Multicast Forwarding............... Enable
Ethernet Broadcast Forwarding............... Disable
IPv4 AP Multicast/Broadcast Mode............ Unicast
IPv6 AP Multicast/Broadcast Mode............ Unicast
IGMP snooping............................... Enabled
I'm calling these CAPWAP encapsulated packets "broadcasting forwarding" but I not sure that is the correct way to describe them. Either way I'd like to understand what the packet are and can we make them stop.
The TOD(Theory Of the Day w/all due respect to Stephen H.) is that these unicasts to the APs are somehow related to Layer 3 mobility....

What is the WLC software version in this case ?
Refer this link & that explain WLC default behavior for wireless client's broadcast packets. It should not broadcast to other wireless clients/AP.
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/emob73dg/emob73/ch2_Arch.html#pgfId-1058225
In your case, if you can take a wireshark capture of the AP connected switchport you can verify client broadcast is forwarding as it is or not. It is good if you can take OTA capture as well so you can confirm client sending broadcast traffic.
HTH
Rasika
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WLC(s): are "forwarding" broadcast pkts when I don't want them to.

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