topic Re: Packet drops and low bandwidth in Wireless

Packet drops and low bandwidth

night143r — Mon, 05 Jul 2021 19:28:54 GMT

We have two WLCs 5520 and 9800.

We are facing continuous ping drops and low bandwidth issue when we connect AP 3802I-E-K9 with 9800. These 3800 series APs are working fine with WLC 5200

We raised a ticket with cisco support and upon their recommendation we upgraded firmware of WLC 9800 that they provided. Ping drop problem is solved but low bandwidth is still same.

Any suggestions

Re: Packet drops and low bandwidth

balaji.bandi — Fri, 04 Sep 2020 20:34:48 GMT

Low bandwidth - can you explain what is the source and destination

how are you testing it? is this from the internet ? - Hope without connecting to Cat 9800 throughput ok ?

Re: Packet drops and low bandwidth

night143r — Fri, 04 Sep 2020 20:49:06 GMT

When we perform speed test we are getting only 200Mbps download speed in total, though we have 1Gbps WAN links.

Re: Packet drops and low bandwidth

Leo Laohoo — Sat, 05 Sep 2020 01:18:59 GMT

What firmware is the WLC running on?
What wireless client was used to test the "low bandwidth"?
What radio was the test wireless client associated to?
What antenna is used on the AP?
Is the issue isolated to this single AP or across the site/fleet?
Is the issue observed on a single wireless client or across the site/network?

Re: Packet drops and low bandwidth

night143r — Sat, 05 Sep 2020 02:45:36 GMT

What firmware is the WLC running on? Using 17.3.1
What wireless client was used to test the "low bandwidth"? Cell phones ,laptops,Tablets
What antenna is used on the AP? Internal
Is the issue isolated to this single AP or across the site/fleet? Issue is with AP 3802-I-E-K9 specifically
Is the issue observed on a single wireless client or across the site/network? There is no problem when our clients are connected with 5520 controller, and when clients are connected with 3802 AP and that AP is on 9800 then we face internet disconnection, ping drops, and low bandwidth

Re: Packet drops and low bandwidth

balaji.bandi — Sat, 05 Sep 2020 03:15:38 GMT

as per the description, it was down to Cat 9800 i guess here - since you mentioned WLC 55XX not having the same issue with the same AP.

https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/212892-802-11ac-wireless-throughput-testing-and.html

I have Limited hands-on Cat9800 still getting on - do you have any other AP Model to Test?

Re: Packet drops and low bandwidth

Scott Fella — Sat, 05 Sep 2020 03:24:44 GMT

What download speeds are you expecting? What you are seeing is kind of the norm for any of the wireless products. Wireless is half duplex so what you see as far as connection rate, you would see half of that at the most and that also depends on other variables. I bet on the 5520, you would see the same. You are better off testing with Iperf and using a wired Iperf server. Do t use any Speedtest and thinking that on wireless you should achieve the bandwidth that your wan can provide. That is not the case, and wireless will be lower than wired devices connected at 1gig full duplex.

Re: Packet drops and low bandwidth

patoberli — Mon, 07 Sep 2020 15:12:11 GMT

Did you enable the AC data rates on the new controller? Do you use the same channel width as on the old controller?