Thanks @PhilipDAth - That all makes sense. The one caveat is that we are running layer 3 switching on our switch stack, so I would assume I am going to add the static route to the other org there so it can be propagated via OSPF to our other sites that are currently on the VPLS? Our MX would then have a static route that points to the MX in concentrator mode for the other org so all traffic destined for the other org would be passed up from the switch stack and then routed over to the concentrator MX. We are currently running a mix of Auto-VPN and VPLS. The Auto-VPN will be going away (except for one frustrating site that can't connect to the VPLS), and we will be routing via OSPF between all sites. So, Auto-VPN will handle connectivity via some sites, and OSPF for others, but regardless of the method, I can see how this will work.
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