I am trying to set up a trunk port with 2 vlans, 100 and 200. 100 needs to be tagged for management, and 200 untagged for public.
I am not sure how to do this in ROS. In Cisco we just allow 100,200 and set 200 to the native vlan.
Is it possible to do this in ROS?
If so, can someone explain how?
If you bridge vlan 100,200 and the interface, then both vlans need to be tagged.
If you add vlan 100 to the interface, can you then add that to a bridge with 200? or would that put vlan 100 inside 200?
Mikrotik for the most part does not have that developed a switch chip.
As far as I have seen to run native Vlan untagged it must have been tagged once it arrives back at the router… So you need a switch to handle that tagging on trunk and untagging on native ports.
The 260GS works fine.
So handle your tagging and untagging in the switch and just setup the router to receive data on those two Vlans.
Awesome, thanks. Ill give that a try. 
Now if they made a rackmount 8,12,24 port switch that would be awesome.
Just to provide more info
http://wiki.mikrotik.com/wiki/Manual:Switch_Chip_Features
You will notice that the mikrotik switch chips are different across most models…
Head down to the final section
Example - 802.1Q Trunking with Atheros switch chip in RouterOS v6
In here you read this works with AR8316, AR8327, AR8227 and AR7240 switch chips. However this is not completely true the default vlan option (and only that option) does not work on AR8327.
Since Mikrotik has not been able to standardize there switch chips… I don’t rely on their switch at all for VLAN.