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To BGP or not to BGP?

BGP is a protocol used to make inter-routing decisions. We could use this to configure the routes between our networks. Rough collection of pro/con of using BGP for our project by @johanngoltz and @ciklista:

standard for dynamic routing between networks, pushed by VM vendors (but our network setup is rather static)
GCP requires BGP for HA (99,99%) VPN connections, they must have their reasons
BGP configuration extra difficult for Hetzner & Proxmox, but probably not for real cloud providers
failover between tunnels might be easier than with classic DPD, but advantages limited if we use only one gateway node on Hetzner & Proxmox
transit routing in case one tunnel fails, but others are still available (but how well can we market this feature to those who will grade us?), like so:

Full mesh transit routing