same AP, same network, one SSID is doing much faster than another one
I encountered a really strange thing. I have two SSIDs, let's say SSID1 on Vlan 10 and SSID2 on Vlan 20, both are setup for FlexConnect local switching in my new office. And both SSIDs are using the only one internet link (40M). I sat at my desk, not moving, connect to SSID1, I got 802.11n 114M, internet speed test got over 36M, then I changed to SSID2, I got also 802.11n but only 56Mm, and internet speed test only got 7-8M!!!!
So, using same internet connection, same core switch, connecting on same AP, got same .11n connection, how could one SSID did much better than another?
checked raido interface on the AP, switch ports, VLANs interface on the core switch, didn't see any error packets or other issues. APs and the internet link are connected on the one core switch, so no different path for routing.
checked wlan settings on the WLC(5508), apart from securtity setup is different, SSID1 is using WAP2 with psk, SSID2 is using WAP2+.1x, nothing else is different.
and that happened on all my 5 new 2602i and 3 old cisco lightweight APs.
I hope you configured WPA2 with AES in both scenarios (no WPA & TKIP enable). Also WMM enable for both SSID. Those are the two primary criteria to get 802.11n data rates for a client.
I would check in both cases whether client is connected in same data rate (see the Current Rate). You can check it using "show client detail <MAC-Address>" output. Here is a sample output for a client connected to a PSK SSID.
1, cannot change the security settings, that is a requirement.
2, when I connected to the two SSIDs I did get different rate, as I mentioned in the case, SSID1, the fast one I got 114M something, and SSID2 I got only 56M. But why, there are on the same AP, I was sitting steady, and just disconnected one SSID then connected to another one.
yes, you are right that the authentication happens only once when the client is associated to the WLAN. However, the type of authentication used will be counted or taken into consideration when 802.11n rates are enabled.
As there are some of the limitations to use 802.11n data rates to use either open authentication or WPA2 with AES encryption and a channel bonding to 40 Mhz under 802.11a radio.
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
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The script should be completely self explanatory.
Powershell SNMP Module (Install-Module -Name SNMP)
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