How to route both a WAN VLAN and a LAN VLAN to 1 port?

Hi,

So I’ve got a RB2011UAS and the following situation:

WAN with 2 VLAN ID’s: 128 for WAN access, 4 for TV. Both services receive vastly different “WAN” IP’s.
This comes in on ether5.
Vlan 4 is bridged with bridge-iptv with ether 6 where I connected the set-top-box (STB).
Vlan 128 is bridged with bridge-local that includes ether1-4 and the wlan interface.
DHCP is running on bridge-local.

Everything is working fine, but here’s the problem: I want to have both Vlan 4 and access to bridge-local going to ether6. I have a VLAN enabled switch that I’ve put in between the RB2011 and the STB. It untags vlan 4 for the STB and that works perfectly. However getting access to bridge-local through one or more of the other ports of the switch is not working.

I’m running to my lack of knowledge of Mikrotik logic, or maybe to the limitations of the RB2011’s chipset.

Can anyone advise if a) this is possible, and if yes b) how to configure it ?

Thanks!