Re: cisco wireless

Anjana A · ‎05-11-2021

Hello team,

we are using cisco 5520 wlc with 8.10.130.0 ios.

AP model is 3702 ap, users are reporting slowness in wifi. while checking the interference found thrid party interfering devices for 802.11b radio.

Almost all users are getting connected to 802.11ac/802.11n radios, whether the interference on 2.4 radio will cause slowness for this users.

AP04

Persistent Interference Devices

Class Type Channel DC (%%) RSSI (dBm) Last Update Time

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

Canopy 6 1 -82 Thu May 6 21:02:34 2021

WiMax Fixed 1 0 -62

6 0 -62 Mon May 10 04:52:17 2021

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Ap05:

Persistent Interference Devices

Class Type Channel DC (%%) RSSI (dBm) Last Update Time

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

Microwave Oven 11 9 -74 Wed May 12 03:30:32 2021

Canopy 11 1 -86 Mon May 10 06:22:26 2021

AP06

Persistent Interference Devices

Class Type Channel DC (%%) RSSI (dBm) Last Update Time

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

Video Camera 1 100 -73 Sun May 9 22:06:43 2021

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Anjana

saravlak · ‎05-11-2021

No, interference on 2.4ghz band shouldn't impact 5ghz users.
if the reported users are from 5ghz then the issue is something else that needs to be narrowed down and isolated.

Leo Laohoo · ‎05-12-2021

@Anjana A wrote:

AP model is 3702 ap, users are reporting slowness in wifi.

Not enough info:

What band were the users connected to, 2.4 Ghz or 5.0 Ghz?
What OS were the users on? Are they ALL using the same OS?
What happens when you transfer data from one wireless client to another wireless client?

Anjana A · ‎05-12-2021

What band were the users connected to, 2.4 Ghz or 5.0 Ghz? users are connected to 5.0 GHZ
What OS were the users on? Are they ALL using the same OS? Yeah all users are same OS .OS Windows10
What happens when you transfer data from one wireless client to another wireless client? they are facing slowness.

Leo Laohoo · ‎05-12-2021

@Anjana A wrote:

Yeah all users are same OS .OS Windows10

Try using different OS: Try with Android/Chrome, Apple iOS.

patoberli · ‎05-12-2021

And how many users are connected to the radio/AP? What is the configured channel width on the 5 GHz radio and how high is the radio utilization?

Anjana A · ‎05-12-2021

We have totally 6 AP's at site. All the users connecting to the AP are facing the slowness irrespective of the ssid.

Regards, Anjana

patoberli · ‎05-12-2021

And how many users are that?

Is this slowness new or was it always there?

Could you maybe run an iperf between a wireless connected and a lan connected user?

Have you tried rebooting one AP and test if it's ok again for that one AP?

Scott Fella · ‎05-12-2021

I agree with patoberli.... you need to start trying to isolate the issue and gather as much information as you can. If you believe it is that one ap, swap that ap with another that has no issues and see what happens. Basic troubleshooting in wireless is to reproduce the issue and gather the facts. Try different devices, check nic firmware, etc. This way folks here can help you resolve the issue or provide feedback that may help.

-Scott
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saravlak · ‎05-12-2021

need granular issue statement and more detailed scenario/use-case -Wireless slow is a very generic statement, the generic stuff to check.
Any recent change in network - config/setup/upgrades.
are issues isolated within LAN/WAN network, Does WAN link have enough bandwidth.
Any physical port errors noticed. are port speed/duplex configs fine.
Are all or specific applications impacted. is it tcp/udp/multicast traffic impacted.
what's the expected speed and how much are you getting.
And talk to end-user to obtain feedback to understand the exact issue.