User guide

5-137
Using the Command Line Interface
• AES-CCMP (Advanced Encryption Standard Counter-Mode/CBCMAC
Protocol): WPA2 is backward compatible with WPA, including the same
802.1X and PSK modes of operation and support for TKIP encryption. The
main enhancement is its use of AES Counter-Mode encryption with Cipher
Block Chaining Message Authentication Code (CBC-MAC) for message
integrity. The AES Counter-Mode/CBCMAC Protocol (AES-CCMP)
provides extremely robust data confidentiality using a 128-bit key. The
AES-CCMP encryption cipher is specified as a standard requirement for
WPA2. However, the computational intensive operations of AES-CCMP
requires hardware support on client devices. Therefore to implement
WPA2 in the network, wireless clients must be upgraded to
WPA2-compliant hardware.
Example
mic_mode
This command specifies how to calculate the Message Integrity Check (MIC).
Syntax
mic_mode <hardware | software>
• hardware - Uses hardware to calculate the MIC.
• software - Uses software to calculate the MIC.
Default Setting
software
Command Mode
Interface Configuration (Wireless)
Command Usage
• The Michael Integrity Check (MIC) is part of the Temporal Key Integrity
Protocol (TKIP) encryption used in Wi-Fi Protected Access (WPA) security.
The MIC calculation is performed in the access point for each transmitted
packet and this can impact throughput and performance. The access point
supports a choice of hardware or software for MIC calculation. The
performance of the access point can be improved by selecting the best
method for the specific deployment.
• Using the “hardware” option provides best performance when the
number of supported clients is less than 27.
Enterprise AP(if-wireless g: VAP[0])#cipher-suite TKIP
Enterprise AP(if-wireless g)#