topic Re: Max retransmission to AP CW9166I-ROW in Wireless

Max retransmission to AP CW9166I-ROW

husseinrhebi — Mon, 27 Nov 2023 20:46:25 GMT

I have Cisco Catalyst 9800-L Wireless Controller model and CW9166I-ROW AP running version 17.9.4
The Issue : Max retransmissions to AP

AP automatic disjoin to WLC and automatic join aging

Re: Max retransmission to AP CW9166I-ROW

Leo Laohoo — Mon, 27 Nov 2023 22:55:59 GMT

What is the country code configured for the ROW?

Re: Max retransmission to AP CW9166I-ROW

husseinrhebi — Tue, 28 Nov 2023 07:28:33 GMT

he country code for ROW is Libya (LY). I know that Libya does not support 6 GHz radio, but it should work on 5 GHz or 2.4 GHz.

Re: Max retransmission to AP CW9166I-ROW

Mark Elsen — Tue, 28 Nov 2023 09:25:08 GMT

- Have a checkup of the 9800-L configuration with the CLI command show tech wireless ; feed the output into
Wireless Config Analyzer

Re: Max retransmission to AP CW9166I-ROW

eglinsky2012 — Tue, 28 Nov 2023 14:45:56 GMT

How is the wiring, are there any errors on the switch port or AP interface? Is there a WAN link on the wired network between the AP and the WLC (IPSEC, etc.)?

Re: Max retransmission to AP CW9166I-ROW

husseinrhebi — Tue, 28 Nov 2023 15:23:45 GMT

Please find attached the implementation of 'show tech wireless' in the Wireless Configuration Analyzer.

Re: Max retransmission to AP CW9166I-ROW

husseinrhebi — Tue, 28 Nov 2023 15:20:18 GMT

No, there are no errors on the switch port to the AP, and there is no WAN link.

Re: Max retransmission to AP CW9166I-ROW

Mark Elsen — Tue, 28 Nov 2023 15:24:02 GMT

- Following up on results from WirelessAnalyzer : set valid time , time zone and configure valid and working NTP server (service) on the 9800-L controller ,

Re: Max retransmission to AP CW9166I-ROW

Rich R — Wed, 29 Nov 2023 00:01:21 GMT

Make sure you have the 17.9.4 APSPs and SMUs installed.
https://software.cisco.com/download/home/286323430/type/286308587/release/17.9.4
https://software.cisco.com/download/home/286323430/type/286325254/release/17.9.4
If you still see the problem open a TAC case for TAC to capture all the relevant debugs, radioactive traces and packet captures.

Re: Max retransmission to AP CW9166I-ROW

Ambuj M — Wed, 29 Nov 2023 01:45:45 GMT

lot of good suggestions, you can also start with some basic KPI check for APs and see how things look like, may be we find something unusual.

Check for AP reloads or capwap restarts. Identify APs with lower "AP Up Time" -->reload or lower "Association Up Time"--> capwap restart

show ap uptime | ex ____([0-9])+ day

Note : focus on APs reloaded or restarted within 1 day

Check for AP crashes

show ap crash

Check for highest number of events or unexpected events of AP session termination

show wireless stats ap session termination

Check for disconnect reasons and time of disconnections

show wireless stats ap history | i Disjoined

Check for APs with misconfigured tags

show ap tag summary | i Yes

Re: Max retransmission to AP CW9166I-ROW

husseinrhebi — Wed, 29 Nov 2023 14:33:43 GMT

After adjusting the time, the problem is still the same

Re: Max retransmission to AP CW9166I-ROW

husseinrhebi — Wed, 29 Nov 2023 14:34:22 GMT

thanks for your support