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Cannot negotiate maximum speed rate through wirelss on AC6605

Publication Date:  2014-06-30 Views:  418 Downloads:  0
Issue Description
Customer creates two SSID with 802.11n mode. He found one SSID cannot negotiate maximum speed rate and only have 52M
[XXX-wlan-radio-prof-80211AN]display station status sta XXXX-XXXX-XXXX
  Station mac-address                       : XXXX-XXXX-XXXX
  Station ip-address                        :
  Station gateway                           :
  Associated SSID                           : KOSGroup_NET
  Station online time(ddd:hh:mm:ss)         : 000:00:03:10
  The upstream SNR(dB)                      : 51.0
  The upstream aggregate receive power(dBm) : -60.0
  Station connect rate(Mbps)                : 52
  Station connect channel                   : 136
  Station inactivity time(ddd:hh:mm:ss)     : 000:00:00:15
  Station current state
    Authorized for data transfer            : YES
Alarm Information
Handling Process
1. Check the configuration and did not find the root cause. Make a local test and find the reason.
Configuration is below:
service-set name KOSEmployees id 0                                            
  wlan-ess 1                                                                   
  ssid KOSGroup_NET                                                            
  traffic-profile id 0                                                         
  security-profile id 0                                       ///It invokes security profile 0                  
  dhcp snooping                                                                
  dhcp trust port 
security-profile name Security_Profile id 0                                   
  security-policy wpa-wpa2                                                     
  wpa-wpa2 authentication-method psk pass-phrase cipher XXXXX encryption-method tkip


2. After confirmed, customer use TKIP encryption method. This method cannot support 8021.11n. So even cusotmer configuration 802.11n radio type, the maximum speed is 54M. Change the encryption method to CCMP and test it works fine.

Root Cause