conf

MX side relevant configuration :

rsvp {
    interface all;
    interface lo0.0;
}
mpls {
    label-switched-path from-mx-to-ex {
        to 192.58.176.13;
        no-cspf;
    }
    interface ae0.0;
    interface ae1.0;
    interface xe-0/0/2.60;
    interface lo0.0;
}
isis {
    export isis-export;
    spf-options delay 50;
    level 1 disable;
    level 2 wide-metrics-only;
    interface xe-0/0/2.60 {
        hello-padding disable;
        level 1 disable;
        level 2 {
            metric 10;
            hello-interval 1;
            hold-time 1;
        }
    }
    interface ae0.0 {
        hello-padding disable;
        level 1 disable;
        level 2 {
            metric 100;
            hello-interval 1;
            hold-time 1;
        }
    }
    interface ae1.0 {
        hello-padding disable;
        level 1 disable;
        level 2 {
            metric 100;
            hello-interval 1;
            hold-time 1;
        }
    }
    interface all {
        disable;
    }
    interface lo0.0 {
        passive;
        level 1 disable;
    }
}
ldp {
    track-igp-metric;
    keepalive-interval 3;
    keepalive-timeout 18;
    interface xe-0/0/2.60 {
        apply-groups ldp-ints;
    }
    interface ae0.0 {
        apply-groups ldp-ints;
    }
    interface ae1.0 {
        apply-groups ldp-ints;
    }
    interface lo0.0;
}
connections {
    remote-interface-switch C1 {
        interface xe-0/0/2.666;
        transmit-lsp from-mx-to-ex;
        receive-lsp from-ex-to-mx;
    }
}

EX side :

rsvp {
    interface all;
    interface lo0.0;
}
mpls {
    label-switched-path from-ex-to-mx {
        to 192.58.176.10;
        no-cspf;
    }
    interface xe-0/0/31.60;
    interface lo0.0;
}
isis {
    export isis-export;
    spf-options delay 50;
    level 1 disable;
    level 2 wide-metrics-only;
    interface xe-0/0/31.60 {
        hello-padding disable;
        level 1 disable;
        level 2 {
            metric 10;
            hello-interval 1;
            hold-time 1;
        }
    }
    interface all {
        disable;
    }
    interface lo0.0 {
        passive;
        level 1 disable;
    }
}
ldp {
    track-igp-metric;
    keepalive-interval 3;
    keepalive-timeout 18;
    interface xe-0/0/31.60 {
        apply-groups ldp-ints;
    }
    interface lo0.0;
}
connections {
    remote-interface-switch C1 {
        interface ge-0/0/10.0;
        transmit-lsp from-ex-to-mx;
        receive-lsp from-mx-to-ex;
    }
}