FWIW, i would've done things a bit differently to simplify 1. i wouldve used the second octet in my ip address scheme as a site identifier vs. the third. makes route summarization easier. in other words, site A ip subnets would all fall under a 10.1.0.0/16 CIDR and site B under 10.2.0.0/16. you could then use 10.x.1.0/24 for data, 10.x.2.0/24 for voice, etc. x being your site identifier in the second octet. 2. the only trunk ports you need are to anything downstream or upstream that needs to be aware of your vlan tags. in your case, it looks like just downstream switches at both sites? 3. assuming your default route on the meraki switches all has a next hop of your router ip addresses? 10.22.22.2 and 10.22.220.2? from my point in number 1, this would make the route on those routers simpler as they could be summarized simply as route 10.x.0.0/16 to the next hop ip of your meraki switch. in your case, you cannot summarize on the routers and, if you add new networks, now need to get those additional network routes added to them for each site. a simple /16 summary covers you from that perspective. 4. with regards to number 3, i'm unclear as to how the backup link would be used? you'd need a routing protocol setup to have muliple paths. meraki only supports ospf on the MS switches.
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