topic how to speed up the roaming speed between two aerohive 230? in ExtremeWireless (IQE)

how to speed up the roaming speed between two aerohive 230?

zlinuxboy — Thu, 08 Jul 2021 07:30:00 GMT

I deploy two aerohive ap230 on the same floor, here is the result of `show acsp neighor | inc aerohive` and `show acsp`
---

AH230(bigroom)#show acsp

Interface Channel select state  Primary channel  Channel width Power ctrl state      Tx power(dbm) Use Last Selection
--------- --------------------- ---------------- ------------- --------------------- ------------- ---------------------
Wifi0     Enable                11               20            Enable                14            Channel:No  Power:No
Wifi1     Enable                44               40            Enable                13            Channel:No  Power:No

AH230(bigroom)#show acsp neighbor | inc aerohive
Bssid           Mode     Ssid/Hive                Chan Rssi(dBm) Aerohive AP  CU  CRC STA Channel-width VID  NVID
9c5d:1249:2bd4  Access   aerohive                 1    -75       yes          25  25  1   20            9    9
Bssid           Mode     Ssid/Hive                Chan Rssi(dBm) Aerohive AP  CU  CRC STA Channel-width VID  NVID
4018:b129:26e9  Access   aerohive                 157  -69       yes          0   0   0   40+           -    -
9c5d:1249:2be4  Access   aerohive                 157  -76       yes          5   12  4   40+           9    9


AH230(jkzq-core)#show acsp

Interface Channel select state  Primary channel  Channel width Power ctrl state      Tx power(dbm) Use Last Selection
--------- --------------------- ---------------- ------------- --------------------- ------------- ---------------------
Wifi0     Enable                1                20            Enable                14            Channel:No  Power:No
Wifi1     Enable                157              40            Enable                14            Channel:No  Power:No

AH230(jkzq-core)#show acsp neighbor | inc aerohive
Bssid           Mode     Ssid/Hive                Chan Rssi(dBm) Aerohive AP  CU  CRC STA Channel-width VID  NVID
4018:b129:26d4  Access   aerohive                 6    -81       yes          31  0   0   20            -    -
9c5d:1249:1614  Access   aerohive                 11   -76       yes          19  94  2   20            9    1
Bssid           Mode     Ssid/Hive                Chan Rssi(dBm) Aerohive AP  CU  CRC STA Channel-width VID  NVID
9c5d:1249:1624  Access   aerohive                 44   -73       yes          7   84  4   40+           9    1

---

I walk with android running two tools(termux and wifi魔盒), walk from one ap zone to another ap zone, and rear back. Here are the results:

ping

running termux on android, and ping the subnet's gateway

ping result of roaming

it seems there are 3 packets lost when roaming.

wifi魔盒(Developed by a chinese corp, so I translate the chinese to english)

the result indicate that there is one packet lost when roaming, the latency is huge big: 698ms

wifi魔盒 roaming result

it seems there are 5 packets lost when roaming

question:

what utilitis how do you guys use to evaluated roaming?
how to tune the roaming speed up?

Re: how to speed up the roaming speed between two aerohive 230?

SamPirok — Thu, 15 Jul 2021 21:34:12 GMT

Hello, I ran this question by our XIQ engineers and they requested that you open a case for this so we can dig in a bit deeper with you to see what can be done to improve the roaming speeds.

Re: how to speed up the roaming speed between two aerohive 230?

zlinuxboy — Wed, 21 Jul 2021 10:49:20 GMT

After google around, I found a useful blog:
https://www.sniffwifi.com/2018/08/roam-if-you-want-to-as-long-as-your.html

I change the channel width from 40Mhz to 20Mhz, the roaming peroid change dramatically from Hundreds to dozens, but I don't understand how it works. here are some piece from that post:

My experience, on the other hand, is that design cannot overcome some of the issues that arise when 40 or 80 MHz wide channels are used in high mobility environments. Even with an "optimal" design, an AP or client device could stubbornly transmit using higher-than-expected data rates, thus causing data frame failures even with a "good" SNR. When the SNR signal has to be at double (for 40 MHz wide channels) or quadruple (for 80 MHz) the level in order for frames to be successful, the problem of stubbornly high data rates is exacerbated. Or, client devices may be "sticky", and stay connected to a low SNR signal AP, even though the client has moved close to a higher SNR signal AP.
Obviously, I have not seen every Wi-Fi environment. From the enterprise Wi-Fi environments I have seen, 20 MHz wide channels helps roaming. The reality is that low SNR instances may occur when people are on the move, and the exclusion of 40 or 80 MHz wide channels can prevent that movement from causing short term Wi-Fi connectivity outages.