Troubleshooting Tip: DARRP channel assignment on FortiAP WiFi

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Description	This article describes the steps to set DARRP (Distributed Radio Resource Provisioning) channel assignment on FortiAP WiFi.
Scope	FortiAP 7.4.x, FortiGate 7.4.x.
Solution	DARRP feature assigns non-overlapping channels on the FortiAPs managed by FortiGate and the DARRP is used to address co-channel interference on the Wireless Networks. Ensure FortiAPs are on the latest 7.4.x GA and FortiGate on minimum 7.2.8, 7.4.1, because known DARRP bugs 825182 and 923530 are fixed on FortiOS 7.2.8, 7.4.1, and higher versions. Resolved issues 7.4.1 Remove static override channel settings if any from the APs, and enable DARRP (Radio Resource Provisioning) in all radios in the FortiAP profile:   Ensure the FortiGate arrp-default profile has the following config in place: config wireless-controller arrp-profile     edit "arrp-default"     weight-weather-channel 0     weight-dfs-channel 0         set include-weather-channel enable         set include-dfs-channel enable end Unset non-default darrp-optimize value if any and set it to default value: config wireless-controller setting show     unset darrp-optimize end During a change window, trigger DARRP channel planning manually using the below command on FortiGate: diagnose wireless-controller wlac -c darrp 1 Note: By default, the DARRP automatically runs every 24 hours (86400 seconds). DARRP schedule can also be defined, refer to: Configuring Distributed Radio Resource Provisioning To view the DARRP channel assignment status on the FortiGate and FortiAP, use the following commands: FortiGate: diagnose wireless-controller wlac -c darrp FortiAP: cw_diag -c darrp Note: If the APs are far from each other (for example more than 60-80 feet apart or more) then DARRP may not assign a non-overlapping channel because the APs cannot see each other (due to weak neighbor RSSI) and hence, the APs may choose to operate on any channel of their choice and it should be fine because chances of co-channel interference are low as the APs are far from each other.