topic Re: 7731 RB -NBR Problem in Access Points - Indoor and Outdoor

7731 RB -NBR Problem

marc_van_houwel — Tue, 10 Mar 2015 20:47:59 GMT

I am trying to setup a link with a Root Bridge to a Non Root bridge. Once I choose a channel I am getting a good link. The Up/Down is 10/9 and RSSI is 39/36. From my understanding this is a descent link. However when I run the SpeedFlex test I am loosing a high percentage of packets and the throughput is low. I pull the logs and can see there is interference,but I am at a lost as to why the throughput is so slow. I ran some speedtest and was getting less than a meg. Any suggestions or where to troubleshoot.

Thanks

Re: 7731 RB -NBR Problem

michael_brado — Tue, 10 Mar 2015 22:30:48 GMT

Yes, look at the Support Info and client statistics for your RB and NRB. It sounds like you might be getting hit by some interference. For example, this Root Bridge sees the NRB at RSSI = 67, but there is some interference resulting in 13% packet error rate.

STA: c4:10:8a:21:1f:a8
	rx_data_frm 158244 rx_mgt_frm 5 rx_bytes 22955781 rx_dup 5
	tx_data_frm 19668 tx_mgmt_frm 5 tx_bytes 3956709
	good_tx_frms 19673 good_rx_frms 158249 tx_retries 1010204
	tx_rate 108000 tx_kbps 16382 rx_crc_errs 109577
	tx_per 13 ack_rssi 66 rx_rssi 67

You don't want PER > 10%, and RSSI - PER >= 25.

Have you run the Channel Optimizer from your RB, and does it always choose the same channel?

Re: 7731 RB -NBR Problem

marc_van_houwel — Wed, 11 Mar 2015 13:21:36 GMT

Where are you getting information that you posted on the reply? Here is my issue. Originally on this link I was getting good speeds up to 20/20. Then I tried changing the link to a 40mhz channel and now I am experiencing this issue.
Yes when I try the optimizer it is choosing the same channel.

Re: 7731 RB -NBR Problem

michael_brado — Fri, 13 Mar 2015 20:26:53 GMT

Kenny, the Support Info file from each side 7731, will show the client statistics like my example above.

Re: 7731 RB -NBR Problem

marc_van_houwel — Mon, 16 Mar 2015 13:12:09 GMT

Ok I see it. Another question. What exactly does the Up/Down mean on the link. Right now I have a 22/20. Thanks

Re: 7731 RB -NBR Problem

munish_munish — Tue, 17 Mar 2015 16:55:39 GMT

Hi Kenny,

UP/Down : This is a counter showing the number of times the
wireless link has been established/disconnected since
the last system reboot.

Thanks
Munish

Re: 7731 RB -NBR Problem

marc_van_houwel — Tue, 17 Mar 2015 16:56:50 GMT

So this would tell me the lower the number the better??

Re: 7731 RB -NBR Problem

munish_munish — Tue, 17 Mar 2015 17:01:46 GMT

Yes, Kenny.

Re: 7731 RB -NBR Problem

marc_van_houwel — Tue, 17 Mar 2015 17:04:26 GMT

I have a RB to NRB link and I have it on a channel that has good RSSI. However when I run a speedflex test the throughput is very low. Any steps to troubleshoot this

Re: 7731 RB -NBR Problem

munish_munish — Tue, 17 Mar 2015 17:30:03 GMT

Hi Kenny,

RSSI does not show good efficiency in optimizingthroughput . This is because the wireless communication quality depends on signal interference,
fading and many other effect besides the signal strength itself.
High transmission power gives high signal interference.Low transmission power may increase throughput because of low interference, but small signal power would make shadow areas. We need to choose the correct settings of WiFi network in order to find optimum value of transmission power and signal interference.

Could you share the throughput result and the support info file? Distance between the two nodes?

Thanks
Munish

Re: 7731 RB -NBR Problem

marc_van_houwel — Wed, 18 Mar 2015 13:31:39 GMT

Here are the errors I'm getting from the log file. I need to get this resolved as soon as possible because I need to start putting customers on this link. OUr distance is 27KM. and the throughput is between 1-3Meg

Re: 7731 RB -NBR Problem

monnat_systems — Wed, 18 Mar 2015 15:53:10 GMT

hi Kenny.

As per log messages, NRB is getting deautheticated because Class 2 frame received from nonauthenticated STA. this happens because NRB attempted to transfer data before it was authenticated.

this is happening almost every minute.

I think this is NOT a real issue but a transient one. You mentioned that link is for 27 KM and is it using external antenna? Is it aimed correctly?

Can you reboot the link and then run the test. Does it give you a better results?
Is the throughput degrading over a period of time?

Re: 7731 RB -NBR Problem

marc_van_houwel — Wed, 18 Mar 2015 16:07:01 GMT

Well what I don't under stand is three weeks ago we were getting about 20megs on this link. I then tried to change it to a 40mhz channel to increase the bandwidth. Once I did that the whole link went to crap. I am not an expert with these radios. Im just trying to figure out why the bandwidth went down so much. Nothing has changed.

We added a bigger antenna, so if anything the link should have improved. I just cant look at the log and see what needs to be troubleshot. I rebooted the RB side.

I am getting into the RB remotely. I am also having a hard time getting to the NRB through the web. It is very slow and does not want to connect all the time. It also doesnt display the pages very well

Re: 7731 RB -NBR Problem

munish_munish — Wed, 18 Mar 2015 16:13:19 GMT

Kenny, could you please open a TAC case to live troubleshoot the issue?

Re: 7731 RB -NBR Problem

marc_van_houwel — Wed, 18 Mar 2015 16:15:02 GMT

Does that require the full support contract? I am working on getting our contract updated. Also would a firmware upgrade possible help?