A virtual bridge
Just as a real-world bridge connects two sides of a river, a virtual bridge connects a Proxmox virtual network to a physical network. A virtual bridge is like a physical network switch where all virtual machines connect to and can be configured using the Spanning Tree Protocol (STP). A virtual bridge is a great way to create separate subnets. All VMs in the same subnet can connect to their respective bridges. Proxmox creates one virtual bridge by default during the installation process. Each Proxmox node can support up to 4,094 bridges. When the same bridge configuration is entered on all nodes, the bridge can be used from any nodes in the cluster, thus making live migration possible without network connectivity interruption. ...
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