10-15-2021 01:59 PM
WLC 5508 environment with many 3702i and 3802i APs. There is one 3702i that slows a client's download speeds and the upload speeds appear normal. With one to two devices connected to the AP, the iperf download speeds are around 20 Mb/s (using -R). The iperf upload speeds are around 125 Mb/s. I replaced the problem AP with a spare 3702i and the client's download speeds are around 100 Mb/s (using -R). With the problem AP on the bench, I have done the format flash and recovery image process with no difference (~20 Mb/s using iperf -R). The clients are connecting with 5Ghz channels. Any thoughts on what would cause this? Would the AP complain if an internal antenna was malfunctioning?
10-15-2021 03:53 PM
The ap wouldn’t know if the antenna is failing only if the radio was faulty. Factory reset the ap and join it back, if the issue persists using the same channel width and channel as another ap in a different area or just with rrm, then I would say the ap is faulty. We have had a few 3702’s go bad and has them replaced. They are pretty old.
10-15-2021 05:30 PM
What firmware is the WLC running on?
Check the AP GigabitEthernet interface for any line errors.
10-16-2021 05:43 AM
There are no errors on the switchport interface the AP is connected to and the AP is connected at 1000Mb/s full duplex. Is there a command to check this on the AP cli? Before I did the format flash I did a factory reset through the WLC with no difference.
10-16-2021 07:09 AM
10-16-2021 04:27 PM
Remote or console into the AP and post the complete output to the command "dir".
10-18-2021 06:33 AM
WLC is running 8.5.171
Directory of flash:/
2 -rwx 274 Jan 1 1970 00:23:26 +00:00 info
3 -rwx 368 Oct 18 2021 10:15:51 +00:00 capwap-saved-config-bak
4 drwx 576 Jan 1 1970 00:26:29 +00:00 ap3g2-rcvk9w8-mx
14 drwx 2368 Oct 15 2021 20:12:43 +00:00 ap3g2-k9w8-mx.153-3.JF14
15 -rwx 0 Mar 1 1993 00:00:35 +00:00 config.txt
16 -rwx 74738 Oct 15 2021 20:16:47 +00:00 event.log
17 drwx 0 Mar 1 1993 00:01:03 +00:00 configs
82 -rwx 368 Oct 15 2021 22:01:04 +00:00 capwap-saved-config
83 -rwx 314 Oct 18 2021 13:23:26 +00:00 env_vars
84 -rwx 64 Oct 15 2021 20:16:44 +00:00 sensord_CSPRNG0
85 -rwx 12312 Oct 18 2021 10:16:27 +00:00 private-multiple-fs
86 -rwx 64 Oct 15 2021 20:16:44 +00:00 sensord_CSPRNG1
40900608 bytes total (19680256 bytes free)
To summerize, I have taken the following steps but still have slow download speeds on one 3702i:
Reset AP via WLC
Format flash AP via cli
Moved to known good cabling and switch
10-18-2021 07:43 AM
I really think that you did enough to isolate the issue to a bad ap. If you really want to keep going, test on 2.4ghz and 5ghz separately and see if maybe the issue is with one radio or not. You can also play around with that ap and configure it for autonomous and do the same test. If the slowness is still there, I don't think that is something that is fixable, but that is me from my experiences with ap's going bad.
10-18-2021 03:00 PM
No signs of bad radio.
I do not see any radio core files.
The event logs matches the same stamps when the new IOS got downloaded.
The sensor logs matches the same stamps with the new IOS.
10-18-2021 03:32 PM
I investigated two other 3702i APs today that had reports from users of bad wifi and found the same symptoms, slow iperf download speeds. I swapped out the two APs with spare 3702i APs and the download speeds appear to be normal now. I did not factory reset the problem APs, but the replacements were factory reset before I installed them. I'll take the problem APs back to my desk and verify I can recreate the problem and try a factory reset. I'll also try one in autonomous mode and see what happens. I really want to know how many other 3702i's are having the same symptoms, but I'd rather not do an iperf test on each one.
10-18-2021 03:51 PM
What firmware is the WLC running on?
Has anyone rebooted the AP when the complaints happen (before replacing the AP)?
10-18-2021 04:17 PM
The WLC is running 8.5.171
I restarted the first AP I was troubleshooting right before I replaced it last week. The two problem APs I worked on today hadn't been restarted in 68 days.
10-18-2021 04:54 PM
So does the reboot of the AP alleviate the problem?
10-18-2021 06:59 PM
The one ap he swapped out and booted up by his desk still has issues. That’s why I think the device is just going bad.
10-18-2021 07:40 PM
@Scott Fella wrote:
The one ap he swapped out and booted up by his desk still has issues.
Gotcha, @Scott Fella.
In that case, I agree and the AP could be failing.
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