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CCMP replay warnings at 12.3(8)JEA IOS version

Hi,

We're using 1100 & 1200 series b/g AP with WPA/WPA2 encryption in our wireless network.

A new warning message generated by APs after IOS Upgrade " 12.3(7)JA3 to 12.3(8)JEA ".

Message:

Dec 20 09:37:56 ap01 44732: Dec 20 09:37:56: %DOT11-4-CCMP_REPLAY: AES-CCMP TSC replay was detected on a packet (TSC 0x2FBE) received from 000e.9bac.fb81.

How can this be formed ?

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