Ok I found your post on the untangle forum
https://forums.untangle.com/networking/45236-setting-up-trunk-between-untangle-mikrotik-switch.html
And it had useful information in the untangle settings.png file. Why didn’t you post that along with the Untangle layout.png?
The most important is that you want to access the management switch via the Untangle FW’s eth2 interface with ip address 10.0.0.1/24. Note that this interace is untagged.
If the only thing that is going to use the untangle eth2 untagged interface 10.10.0.0/24 network is your connection to the switch, then choose an unused vlan (I would leave as the default 1) and set the pvid of both the bridge and ether1 to the same value. If untangle has a dhcp server for eth2 (10.10.0.0/24) and you want the RB2011 to obtain its ip config via dhcp, then you need to set the bridge as a dhcp client. But first get it working with a static ip. The following assumes that your Untangle FW acts as a dns forwarder.
Edit: @404Networks noticed a mistake in the configuration in this post, which was based on my incorrect recommendation below. @tdw do you have any input?
/ip address add address=10.10.0.2/24 interface=ether1 <— Edit: WRONG ether1 is part of the bridge, this should be BR1 (which should now have default pvid 1, the untagged bridge interface.)
/ip address add address=10.10.0.2/24 interface=BR1 <— Edit: I now think it should be like this instead of above. Note this goes against advice in this post, but see my response in this post too.
/ip route add gateway=10.10.0.1
/ip dns set servers=10.10.0.1