interfaces {
    ge-0/0/1 {
        flexible-vlan-tagging;
        unit 600 {
            vlan-id 600;
            family inet {
                address 192.168.2.1/24;
            }
        }
    }
    lo0 {
        unit 0 {
            family inet {
                address 12.12.12.12/32;
            }
        }
    }
}