Using 802.1q in OpenWRT is very difficult when working on a device that doesn’t have a built-in switch or the when the switch chipset isn’t supported.
Creating VLANS is not possible via the web interface (luci) or using the “config switch_port” options in /etc/config/network. The Luci web gui will not have the “Network -> Switch” option available.
In this example, we add a public interface and vlan 2 on ports eth0 and eth1.
Start by getting into the device:
config interface 'public' option type 'bridge' option proto 'static' option ifname 'eth0.2 eth1.2' option ipaddr '126.96.36.199' option netmask '255.255.255.0' config device 'eth0_2' option name 'eth0.2' config device 'eth1_2' option name 'eth1.2'
This creates three interfaces eth0.2, eth1.2 and both are bridged into the interface br-public.
You can use luci to configure the interface if you use the “custom interface” and manually refer to the vlan like this:
config device 'eth0_2' option name 'eth0.2'
After this, the VLAN will be defined but not show up in luci. You will need to specify it using the “custom interface” as shown in the red circle above.