No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

AC6605(V2R6)Some stations turn to offline during roaming

Publication Date:  2016-12-31 Views:  92 Downloads:  0
Issue Description
Customer reported there some stations experience the offline problem:
1.Some stations would be offline when they are roaming.
2.One specific Samsung PC occasionally online failed.
Handling Process
1.About the issue "Some stations would be offline when they are roaming"
  (1) check the station offline-record on the AC6605.

[EPM-EPP-WLAN-1]dis station offline-record all

Rf/WLAN: Radio ID/WLAN ID

------------------------------------------------------------------------------

STA MAC         AP ID Ap name                 Rf/WLAN    Last record time

                Reason

84db-aca9-ce66  2     AP-P0-NORTE             0/8        2016-09-20/13:34:19

                The STA is forced to go offline because its signal strength is too low.

f816-54de-bb15  2     AP-P0-NORTE             0/5        2016-09-20/10:13:21

                The STA is forced to go offline because its signal strength is too low.

c86f-1dbf-2085  55    AP-P5-C3-1              0/9        2016-09-20/09:06:35

                The STA is forced to go offline because its signal strength is too low.

ec88-9201-fdf0  43    AP-P4-C2-2              0/8        2016-09-20/09:38:30

                The STA is forced to go offline because its signal strength is too low.

                45    AP-P4-C3-1              0/8        2016-09-20/08:08:51

                The STA is forced to go offline because its signal strength is too low.

9c2a-831f-eb2d  112   AP-P11-C2               0/8        2016-09-20/13:25:33

                The STA is forced to go offline because its signal strength is too low.

------------------------------------------------------------------------------

It is obvious that there are many stations offline record on the AC6605 and the offline reason is the station signal strength is lower than the threadhold.

(2)Review the configuration of this site:

rrm-profile name default

  smart-roam enable

  smart-roam quick-kickoff-threshold snr 45 ----------------  default value is 15

It is confirmed that the quick-kickoff-threshold is too low so that the station will be kickoff  if the signal strength is lower than the threadhold.

The description of the quick kickoff function is like this:

Usage Scenario

After smart roaming is enabled and the threshold for quickly disconnecting STAs is specified for an AP using this command, the AP acquires a STA' SNR from data packets sent from the STA. If the STA' SNR is lower than the specified threshold, the AP forcibly disconnects the STA so that the STA can reinitiate a connection with the AP or roam to another AP with strong signals.

After changing the “quick-kickoff-threshold” configuration and testing on the site, the roam effect was much improved than before.

2.About the issue "One specific Samsung PC occasionally online failed.":

  (1) There is a station of samsung(NP200A4B) occasionally online failed on the EPP siteDone a Trace with the station on the AC6605:

The station trace process on the AC:

[BTRACE][2016/09/19 11:52:03][EAPoL][b803-0559-9ce1]:Send EAP_request packet to user successfully.(Index=954)

[BTRACE][2016/09/19 11:52:03][EAPoL][b803-0559-9ce1]:Eapol send request/challenge packet to user successfully.enter request status.(local index:954)

[BTRACE][2016/09/19 11:52:06][EAPoL][b803-0559-9ce1]:No response of request challenge from user.

[BTRACE][2016/09/19 11:52:06][EAPoL][b803-0559-9ce1]:Resend EAP_request/identity times exceed max times.(Index=1012)

The station trace process on the AP:

[B803-0559-9CE1]:receive eap pkt to sta from CAPWAP(23),[type(0)=EAP pkt, src mac=04:27:58:3a:be:dc, len=28]

[B803-0559-9CE1]:receive eap pkt from sta by BSS(26),[type(0)=EAP pkt, dest mac=00:06:f4:cb:9d:54, len=148]

[B803-0559-9CE1]:receive eap pkt to sta from CAPWAP(23),[type(0)=EAP pkt, src mac=04:27:58:3a:be:dc, len=1518]

[B803-0559-9CE1]:receive eap pkt to sta from CAPWAP(23),[type(0)=EAP pkt, src mac=04:27:58:3a:be:dc, len=1518]

[B803-0559-9CE1]:receive eap pkt to sta from CAPWAP(23),[type(0)=EAP pkt, src mac=04:27:58:3a:be:dc, len=1518]

The station offline reason is that the AP send the eap packets to the station, but the station does not response the eap packets.

(2) Do the same test with four other PCs(one is the same model of samsung(NP200A4B) and other 3 HP PCs),repeat roam testing serveal times but not find the same problem. The problem is only happened on the specific PC, it is confirmed that the problem related with the PC, there is something wrong the wireless card of the PC.

Root Cause
 The quick-kickoff-threshold is too low before, the station would be kick offline when the rssi is lower than the threadhold.
 The specific problem about the samsung(NP200A4B) is related with PCself, not related with the AP. There is something wrong with the wireless card of the PC.
Solution
Perform the following operations to solve this problem:
1.Changing the quick-kickoff-threshold on the AC6605, it was done yesterday and in the monitor process.
2.The problem about the specific samsung PC can be solved by changing a new wirelesscard.
Suggestions
When adjust the parameter of quick-kickoff-threshold, need to change it step by step, and then test the service.

END