Using VLAN Tags on a Raspberry Pi running LEDE/OpenWrt

Installing and Using OpenWrt Network and Wireless Configuration
6

So there's no Network - Switch section in LuCI, probably because the RPi doesn't have a switch.

/etc/config/network doesn't have a switch section either. And, if I'm understanding the Wiki correctly this means I need to create a "driver-level VLAN"? Assuming this is even possible on the RPi.

The relevant section of /etc/config/network looks like this now:

config interface 'lan'
	option type 'bridge'
	option proto 'static'
	option netmask '255.255.255.0'
	option ip6assign '60'
	option ifname 'eth0'
	option ipaddr '192.168.3.1'

Based on the Wiki it looks like I need to add something like this:

config device 'eth0.2'
 	option name 'vlan2'

And if I still want to be able to access the LAN with untagged traffic, do I just leave everything else as is?

Do I bridge this new device to my exiting LAN interface like so?:

config interface 'lan'
	option type 'bridge'
	option proto 'static'
	option netmask '255.255.255.0'
	option ip6assign '60'
	option ifname 'eth0 vlan2'
	option ipaddr '192.168.3.1'

I'd then set my Cradlepoint VLAN with a VID of 2 on the WAN interface and set it for tagged.

Seems easy enough -- assuming I'm anywhere in the ballpark here on how this is done on a router with no switch.

What am I missing?