AP-51xx Access Point Product Reference Guide
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5. Configure the Key Rotation Settings area as needed to broadcast encryption key changes 
to MUs and define the broadcast interval.
Broadcast Key 
Rotation 
Select the Broadcast Key Rotation checkbox to enable or disable 
broadcast key rotation. When enabled, the key indices used for 
encrypting/decrypting broadcast traffic will be alternatively 
rotated on every interval specified in the Broadcast Key Rotation 
Interval. Enabling broadcast key rotation enhances the broadcast 
traffic security on the WLAN. This value is disabled by default.
Update broadcast 
keys every (300-
604800 seconds) 
Specify a time period in seconds to rotate the key index used for the 
broadcast key. Set the interval to a shorter duration like 3600 
seconds for tighter broadcast traffic security on the wireless LAN. 
Set the interval to a longer duration like 86400 seconds for less 
broadcast traffic security requirements. Default value is 86400 
secs.