[edit]
root@ISP-2-R1# show
## Last changed: 2018-04-11 14:14:58 UTC
version 14.1R1.10;
system {
    host-name ISP-2-R1;
    root-authentication {
        encrypted-password "$1$UMny9ixC$mGqZftl9XNKttGpyPeqaA."; ## SECRET-DATA
    }
    syslog {
        user * {
            any emergency;
        }
        file messages {
            any notice;
            authorization info;
        }
        file interactive-commands {
            interactive-commands any;
        }
    }
}
interfaces {
    em2 {
        description "ISP-2-R1 to ISP-1-R1";
        unit 0 {
            family inet {
                address 30.30.30.10/30;
            }
        }
    }
    em3 {
        description "ISP-2-R1 to Customer B";
        unit 0 {
            family inet {
                address 40.40.40.5/30;
            }
        }
    }
    em5 {
        description "ISP-2-R1 to Edge-2";
        unit 0 {
            family inet {
                address 40.40.40.1/30;
            }
        }
    }
    lo0 {
        unit 0 {
            family inet {
                address 20.20.20.1/32;
            }
        }
    }
}
routing-options {
    static {
        route 0.0.0.0/0 discard;
        route 40.40.40.0/24 discard;
    }
    router-id 20.20.20.1;
    autonomous-system 200;
}
protocols {
    bgp {
        group enterprise-edge2 {
            type external;
            import BGP-ENTERPRISE-IN;
            export BGP-ENTERPRISE-OUT;
            peer-as 10;
            neighbor 40.40.40.2;
        }
        group EBGP-PEER {
            type external;
            export BGP-ISP1-OUT;
            peer-as 100;
            neighbor 30.30.30.9;
        }
        group CUSTOMER-PEER {
            type external;
            import BGP-CUSTOMER-B-IN;
            export STATIC;
            peer-as 400;
            neighbor 40.40.40.6;
        }
    }
}
policy-options {
    policy-statement BGP-CUSTOMER-B-IN {
        term ACCEPT {
            then {
                community add CUSTOMER_B_MARK;
                accept;
            }
        }
    }
    policy-statement BGP-ENTERPRISE-IN {
        term 1 {
            then {
                community add ENTERPRISE-MARK;
                accept;
            }
        }
    }
    policy-statement BGP-ENTERPRISE-OUT {
        term DEFAULT {
            from {
                route-filter 0.0.0.0/0 exact;
            }
            then accept;
        }
        term ACCEPT {
            from community [ CUSTOMER_A_MARK CUSTOMER_B_MARK ];
            then accept;
        }
        term OTHER {
            then reject;
        }
    }
    policy-statement BGP-ISP1-OUT {
        term CUSTOMERS {
            from community CUSTOMER_B_MARK;
            then accept;
        }
        term AGGREGATES {
            from {
                route-filter 40.40.40.0/24 exact;
            }
            then accept;
        }
        term OTHER {
            then reject;
        }
        from community ENTERPRISE-MARK;
    }
    policy-statement STATIC {
        term DEFAULT {
            from {
                route-filter 0.0.0.0/0 exact;
            }
            then accept;
        }
        term OTHER {
            then reject;
        }
    }
    community CUSTOMER_A_MARK members 300:100;
    community CUSTOMER_B_MARK members 400:200;
    community ENTERPRISE-MARK members 10:200;
}

[edit]
root@ISP-2-R1#