[AusNOG] Mikrotik routers and "VLAN trunking over WAN"

[Ross Wheeler]

Looking for someone with Mikrotik experience to confirm which devices 
(any? all?) might achieve the desired outcome here.

Basically there are a number of sites of varying sizes, but for the 
purposes of argument, lets say 20 sites.

Most sites are proposed to have at least two diverse paths. These could be 
ADSL, Microwave, 3G/4G/LTE etc. The point is, different providers, 
different paths.

Each site has it's (n) paths connected to interfaces on a Mikrotik router 
which can aggregate bandwidth across (n) links (and reduce latency 
somewhat) while providing an ability to withstand (n-1) link failures.

The user further intends making extensive use of VLANs to "isolate" 
services (eg, phones, computers, security devices, "public" devices etc). 
Thus it would be entirely likely that there could be 40 switches at 20 
sites, each with 10.10.8.0/22 for "phones" all on VLAN8.

Not withstanding how YOU might do it, is there an intrinsic problem with 
the design (or Mikrotik as the each sites 'edge device') as it stands?

Thanks in advance,
RossW