Yeah I’ve been dying to have a “simple” k8s solution that either uses just a VLAN or ipv6. It’s been one of the few components of k8s that I simply do not understand the rationale for, it seems so much engineering and complexity for what, exactly?
Seems GKE uses calico, though not with ipv6 (as GCP doesn't support it internally), so at least this networking solution has some buy-in. (broadly speaking)
Cilium can be configured to use vxlan and etcd to coordinate machine subnets (it does routing using ebpf)