root@mininet:/# ovs-vsctl show
7b42048f-56c6-4160-a326-dbb54428f36c
    Bridge "s3"
        Controller "tcp:172.18.0.3:6633"
            is_connected: true
        fail_mode: secure
        Port "s3"
            Interface "s3"
                type: internal
        Port "s3-eth1"
            Interface "s3-eth1"
        Port "eth3"
            Interface "eth3"
    Bridge "s1"
        Controller "tcp:172.18.0.3:6633"
            is_connected: true
        fail_mode: secure
        Port "s1-eth1"
            Interface "s1-eth1"
        Port "s1"
            Interface "s1"
                type: internal
        Port "eth2"
            Interface "eth2"
    Bridge "s2"
        Controller "tcp:172.18.0.3:6633"
            is_connected: true
        fail_mode: secure
        Port "s2-eth1"
            Interface "s2-eth1"
        Port "s2-eth2"
            Interface "s2-eth2"
        Port "s2"
            Interface "s2"
                type: internal
    ovs_version: "2.5.2"