Anthos on bare metal requires a Layer 4 network load balancer and supports two load balancer options: bundled and manual.
- Bundled load balancing: Anthos on bare metal deploys Layer 4 load balancers at the time of cluster installation. External load balancer is not required in this case. The load balancers can run on a dedicated pool of worker nodes, or they can be located on the same nodes as the control plane. Since the load balancers broadcast ARP messages to announce VIPs, all the nodes must be on the same Layer 2 subnet.
For more information, see Configuring bundled load balancing.
- Manual load balancing: Anthos on bare metal does not deploy load balancers for clusters. Configure an external load balancer before installing the cluster. Before the cluster installation, configure the clusters control-plane VIP on an external load balancer. After installation, we must configure the load balancer for the Kubernetes services and ingresses in the cluster.
For more information, see Configuring manual load balancing.