root@vsrx1> show configuration interfaces
ge-0/0/0 {
    unit 0 {
        family inet {
            dhcp;
        }
    }
}
lo0 {
    unit 0 {
        family inet {
            address 10.0.0.1/24;
        }
    }
    unit 1 {
        family inet {
            address 10.123.123.1/32;
        }
    }
}

root@vsrx1> show configuration routing-instances
mgmt-loopback {
    instance-type virtual-router;
    interface lo0.1;
    routing-options {
        static {
            route 0.0.0.0/0 next-table inet.0;
        }
    }
}

root@vsrx1> show configuration policy-options
policy-statement mgmt-loopback-host-route {
    term inet {
        from {
            instance mgmt-loopback;
            family inet;
            route-filter 10.123.123.1/32 exact;
        }
        then accept;
    }
    term reject {
        then reject;
    }
}

root@vsrx1> show configuration routing-options
instance-import mgmt-loopback-host-route;

root@vsrx1>