A customer recently placed 10 WLCs in a mobility group and now sees a large amount of additional traffic to and from the controller. What setting should be changed to reduce the traffic?

With 10 WLCs in a mobility group, unicast keepalive and state messages are sent between every pair of controllers, creating N*(N-1) flows; enabling Mobility Multicast Messaging replaces these with a single multicast stream, dramatically reducing the aggregate traffic load on the network.

Mobility Unicast Messaging is the existing default behavior that is causing the traffic increase, not a setting that would reduce it.

Mobility Anchor Keep Alive Count controls how many missed keepalives trigger a peer-unreachable declaration and does not reduce the overall volume of mobility group messaging traffic.

Mobility Anchor Keep Alive Interval controls the frequency of keepalives sent to anchor controllers, which is a different mechanism from reducing general peer-to-peer mobility group messaging overhead.