so you just want to bridge the traffic and not dig into the vlans ? you can use a bridge and setup the mtu to 1504 and i think that will work.
I have over 500 vlans, and trunk to RouterOS to access internet, so i need setup more than 500 vlans to support these vlans.
Infact i am using an bridge to bridge these vlans, and drop the forwared packet between these vlans, then setup gateway address and dhcp-server and hotspot services on the bridge.
when the vlan is just about 100, it works fine, but i found if i setup more than 100 vlans, the routeros become unstable, system become strange, sometime can't resolve the dns, sometime can't ping the gateway address on the bridge, sometime can't web, i become crazy now
, i hate this case.
Is there some more tips to solve this problem? very thanks to u ~!