root@ISP-B:vGW-ISP-A> show configuration
protocols {
    bgp {
        group ISP-A {
            export [ EXPORT_INTERNAL EXPORT_INTERCO ];
            peer-as 65502;
            neighbor 10.0.5.1;
        }
    }
    ospf {
          EXPORT_REMOTE
          area 0.0.0.0 {
            area-range 10.20.0.0/16;
            area-range 192.168.1.0/24;;
            interface lt-0/0/10.31;
            interface lt-0/0/10.32;
            interface lo0.0 {
                passive;
            }
        }
    }
}
policy-options {
    prefix-list INTERNAL {
        10.20.0.0/16;
        192.168.1.0/24;
    }
    prefix-list INTERCO {
        10.0.5.0/30;
    }
    policy-statement EXPORT_INTERCO {
        from {
            protocol direct;
            prefix-list INTERCO;
        }
        then accept;
    }
    policy-statement EXPORT_INTERNAL {
        from {
            protocol ospf;
            prefix-list INTERNAL;
        }
        then accept;
    }
    policy-statement EXPORT_REMOTE {
        from protocol bgp;
        then accept;
    }
}
routing-options {
    aggregate {
        route 10.20.0.0/16;
        route 192.168.1.0/24;
    }
    autonomous-system 65503;
}

root@ISP-B:vGW-ISP-A>