for if it helps: i have my archer c7 v2 working on openwrt 22.03.5 with multiple vlans on two ports
the picture in Archer C7 internal switch configuration consideration helps to get a clear view on the internal switching.
my switch config in luci is:
lan1 + lan3 tagged vlans 8-10-11-12-13.
lan2 untagged vlan 12.
lan4 untagged vlan1.
lan1 goes to managed switch, lan3 goes to openwrt dumb AP
i had higher numbers for the vlans before (>100), didn't work on the archer c7
