The database daemon keeps track of interfaces that are created or modified, so that after a reboot they can be automatically re-created and configured. Open vSwitch has 3 service components to it: database, server and controller. We also assume that the two physical ports are connected to a simple hardware ethernet switch, without anything advanced like VLAN tagging for instance. The second port (eth1) is to be reserved for use by the vSwitch, which has the guest OS(s) attached to it. The first port (eth0) is to be exclusively used by the host OS. There all quite a few different networking designs that can be created but for the sake of keeping this simple we are going to work under the assumption that we are trying to configure a host OS on a computer that has 2 physical ethernet ports. 2 Background on OpenFlow and Open vSwitch.
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