Due to the frustration and time spent on finding a suitable solution for my requirements, I thought I'd share this to save Mikrotik newbies, like myself, their day.
To start with, all I wanted was to bridge via wireless a Cisco dot1q trunk of vlans, untag and distribute the traffic at the end of the network. Several documents describe similar scenario's solution by creating VLANs on both ends of the Mikrotiks. That did not make any sense and did not work as intended.
Generally speaking, a bridge passes traffic from one end to the other whether it is tagged or not. So why create the VLANs on both ends? No need.
As depicted above, I wanted to bridge 2 networks separately in VLAN 70 and 71 and be able to manage all Mikrotik devices globally in VLAN 11.
Note that I won't be diving into details as those are network specific.
Also note that this is the first time I use Mikrotik.
Note that only VLAN 11 is configured on Mik1 so that management traffic can be internally untagged in order to access the Mikrotik box. The rest of the traffic continues tagged through the bridge over to Mik2 where it gets stripped of its tags.
Here all the traffic is received by the WDS interface which is added to bridge1 to which all configured VLANs attach to. Then each VLAN is placed in a separate bridge with its related ether interface in order to strip the tags...
As simple as that ...
If you require more details regarding this setup, let me know.