Client Association Successful / Failed

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  • Updated 2 years ago

How will the SCG / ZD determine a failed associations and what is the main reason of the failed association?

Will it related to frequency jam? or Will it related to the maxium number of client the AP supported?

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AP

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Posted 2 years ago

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Monnat Systems, AlphaDog

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in theory, there are reasons why assoc may not happen as below:

Code-17 Association denied; the access point is resource constrained
Code-18 Association denied;; the mobile station does not support all the data rates required by the BSS
Code-19 Association denied; the mobile station does not support the short preamble option Code-20 Association denied; the mobile station does not support PBCC modulation
Code-21 Association denied,, mobile station does notsupport channel agility option

source - http://www.rfwireless-world.com/Terminology/WLAN-authentication-deauthentication-frame.html
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AP

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May I know where I can get those log ? Since I just know there has many failed association on the AP statistics
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Monnat Systems, AlphaDog

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TD TD, you pull the AP support file at the time when you are seeing this problem that should give some hints..
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AP

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May I know what is the code like on the AP support log?
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AP

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Or may I check it on the SCG to get those info?
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AP

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I think I found it some like reason=?

or other location?

As I found some log stated "Calling node_leave as Assoc capacity reached on Test if reach the configured SSID limit
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Monnat Systems, AlphaDog

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Will it related to frequency jam? not possible as during frequency JAM...there is no communication possible however for a situation to lead to association failure, STA need to do probing, clear authentication and then comes association stage.

or Will it related to the maxium number of client the AP supported?

yes, its possible. see Code-17 Association denied; the access point is resource constrained. AP's capacity to handle client is full or near full. this may happen.

Someone in ruckus can confirm how AP is expecting to behave if client limit reaches max
(Edited)
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AP

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So will there any possible way to check it myself first by AP log or SCG log? Since at that time nearly 100 client on 2.4G and 100 client on 5G that concurrent using on the single AP Where can I get those log?
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AP

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Actually we are planning a area like 75% of football court to handle concurrent 3500 ppl with they able to download a 30MB file within 10 mins.

As the outdoor environment and with need of 802.11ac so lack of product can be choose. 

Since T300 series seems on 5G is less capacity than 7982 on 5G so I expect the memory is less by such reason.

Also Can you share your experience for mobile device that if both 2.4G / 5G is receive what is the device prefer?

As I know each type of device like Android / iOS device will have difference preference to select 2.4G first or 5G first.

Any good site or information can be share on it?
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Sean

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So the way I do it is as  follows:

Football Pitch = 6000 sqm
Areas Used = 75% = 4500 sqm
Area per person = 1.25 sqm
Total Clients = 4500/1.25 = 3,500
Target Demographic = 100% = 3500

5GHz Capable Clients = 70% = 2450

Max Clients Per Radio = 125

AP's required = 2450/125 = 19.6 = 20

Session Concurrency = 840 (based on the likelihood of clients drawing traffic at the same time.

Backhaul Required = 840 * 400Kbps = 336Mbps
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AP

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Thanks for you help to show me the example but I want to know if multiple SSID and user may use WPA2 is it need to change any factor on your example?

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Sean

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I would never deploy any more than 6 SSID's and that is really pushing it, as the more SSID's you broadcast the more management overhead you have.

As for encryption let me get back to you on that unless Michael can help.
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AP

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Thanks for your info at inital it should only 5 ssid but eventually something happened make it to 7