[AC68U] in AP mode can't add extra VLAN/SSIDs

[banjo]

Hi, currently I'm using my AC68U in AP mode as I have a Mikrotik doing the firewall and routing.

According to https://www.asus.com/support/faq/102507 there should be an option to setup multiple SSIDs but I can't tell if this applies to the AC68U or not. Also, it doesn't say if you can trunk multiple VLANs onto a single cat5 port.

What I want to achieve is to have a VLAN called censored which uses the local Mikrotik as default router and gets all its DHCP from the Mikrotik. Then have another VLAN called jumpthewall which gets an OSPF redistributed default route from one of the remote Mikrotiks. The backbone OSPF domain doesn't advertise default routes as each Mikrotik uses its local ISP, so I would need to also work out how to create another area/instance maybe using the AC68U as an OSPF neighbour to redistribute the default route only on the jumpthewall VLAN.

Can any experts here, advise the best way to configure this. (I'll post a network diagram later when I have access to a PC) ?

TIA, Banjo
PS: Doesn't matter what mode it's in, there's no configuration menu for VLAN anywhere.

 

[banjo]

Here is my desired network diagram.

Obviously, I can't create multiple VLANs and SSIDs on the AC68U so VLAN 302 and OSPF area 1 don't exist yet.

If I change to ASUSWRT-Merlin will that give me support for multiple SSIDs, VLANs and OSPF routing? If not, will DD-WRT support that?

Finally I'm quite new to OSPF, so I'm not sure how to just inject the default routes from the 3 routers outside China just into VLAN 302, and let every other VLAN use their local default router. Can anyone help with this?