[FS#3900] Incorrect VLAN configuration after DFS event when using VLAN-aware bridge

[OpenWrt Bugs]

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User who did this - Jan Hoffmann (janhoffmann) 

Attached to Project - OpenWrt/LEDE Project
Summary - Incorrect VLAN configuration after DFS event when using VLAN-aware bridge
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - After a DFS event, the VLAN ID is not set correctly on the bridge.
(Maybe this is related to FS#2396)

Here is the output of "bridge vlan" after a DFS event:
//wlan0// is 2.4 GHz and //wlan1// is 5 Ghz. Both are configured identically, so the VLAN configuration should be the same for both.
However, after a DFS event the VLAN config is no longer set correctly for the bridge ports of //wlan1//. The //wlan0// bridge ports show how the configuration should be.
# bridge vlan
port              vlan-id  
eth0              20
                  30
                  31
eth1              20
                  30
                  31
br-lan            20
                  30
                  31
wlan0             20 PVID Egress Untagged
wlan0-1           30 PVID Egress Untagged
wlan1             1 PVID Egress Untagged
wlan0-2           31 PVID Egress Untagged
wlan1-1           1 PVID Egress Untagged
wlan1-2           1 PVID Egress Untagged



**Example Configuration:**

Here is a subset of my configuration (omitted everything related to VLANs 30 and 31, the configuration is basically the same as for VLAN 20):

/etc/config/network:
config interface 'lan'
	option device 'br-lan.20'
	option proto 'static'
	option ip6gw '2001:db8::1'
	list ip6addr '2001:db8::10/64'

config interface 'lanauto'
	option device '@lan'
	option proto 'dhcpv6'
	option reqaddress 'try'
	option reqprefix 'no'

config device
	option name 'br-lan'
	option type 'bridge'
	list ports 'eth0'
	list ports 'eth1'

config bridge-vlan
	option device 'br-lan'
	option vlan '20'
	list ports 'eth0:t'
	list ports 'eth1:t'

/etc/config/wireless:
config wifi-device 'radio0'
	option type 'mac80211'
	option hwmode '11g'
	option path '[...]'
	option htmode 'HT20'
	option txpower '10'
	option channel '6'
	option country 'DE'
	option channels '1-11'

config wifi-iface 'default_radio0'
	option device 'radio0'
	option network 'lan'
	option mode 'ap'
	option ieee80211w '1'
	option ssid 'OpenWrt'
	option key 'mysupersecretpassphrase'
	option encryption 'psk2+ccmp'

config wifi-device 'radio1'
	option type 'mac80211'
	option hwmode '11a'
	option path '[...]'
	option htmode 'VHT80'
	option txpower '20'
	option channel '116'
	option country 'DE'
	option channels '36-48 100-140'

config wifi-iface 'default_radio1'
	option device 'radio1'
	option network 'lan'
	option mode 'ap'
	option ieee80211w '1'
	option ssid 'OpenWrt'
	option key 'mysupersecretpassphrase'
	option encryption 'psk2+ccmp'

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3900

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