my wlc analyzer keep on informing me about syslog messages sent in broadcast from my APs.
how can I solve this problem?
by default, the LAPs send log infos to the broadcast address, 255.255.255.255. you should set this to your syslog-server, so that can be unicasted.
config ap syslog host global 220.127.116.11
otherwise your LAP-network will be flooded with broadcasts if something odd happens.
see also "Wireless LAN Controller (WLC) Configuration Best Practices" for details on this hint and other things that you possibly "should set".