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Additionally you can install the routing software on server itself and let it form neighbor-ship with ToR router(s) and use ECMP directly from server in multi NIC scenarios. ECMP failover/recovery is faster and simpler (vendor agnostic) than link aggregation protocols. Basically each rack becomes its own OSPF totally stubby area. Data center core runs as area 0.

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BIRD or other BGP on the host running VMs/containers is what Calico does. We had it peer with our ToR "switches" over BGP.

We could do zero downtime, 1 or 2 packets lost live migration of workloads from one hypervisor host to another and had full ECMP capabilities.

We did this with both IPv4 and IPv6. There is nothing special about IPv6, but it does make it easier to aggregate routes.

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