Is it possible to add OSPF dynamic routing protocol for LAN/Site-to-site tunnel interface ?
Imagine the following case.
Two data center connecting via High Speed link (OSPF configured).
Branch device has one S2S VPN to each Datacenter Peplink (HA pair or not).
Branch traffic reach the different networks using the shortest path.
If the S2S to a datacenter fails, traffic is routed to other VPN.