test2.dot

digraph G {
    rankdir=LR;
    nodesep=.15;

    subgraph clusterC {
        node [style=filled, shape=box, color=lightgrey];
        label = "Cluster Gandalf";
        color = blue;

        cl1 [label="Cl 1 (8001)"];
        cl2 [label="Cl 2 (8002)"];
        cl3 [label="Cl 3 (8003)"];
        cl4 [label="Cl 4 (8004)"];
        cl5 [label="Cl 5 (8005)"];

        cl2 -> cl1 [style=dashed];
        cl3 -> cl2 [style=dashed];
        cl4 -> cl1 [style=dashed];
        cl5 -> cl1 [style=dashed];
    }

    subgraph clusterAs {
        subgraph clusterA1 {
            node [style=filled, shape=box, color=lightgrey];
            label = "Aggregator A";
            color = red;

            aga1 [label="Agg A 1 (8111)"];
            aga2 [label="Agg A  2 (8112)"];

        }

        subgraph clusterA2 {
            node [style=filled, shape=box, color=lightgrey];
            label = "Aggregator B";
            color = red;

            agb1 [label="Agg B 1 (8121)"];
            agb2 [label="Agg B 2 (8022)"];

        }

        color = white
    }


    subgraph clusterCa {
            node [style=filled, color=lightgrey];
            label = "Connector A";
            color = grey;

            ca1 [label="Ca1 (8211)"];
            ca2 [label="Ca2 (8212)"];
            ca3 [label="Ca3 (8213)"];
        }

    subgraph clusterCb {
            node [style=filled, color=lightgrey];
            label = "Connector B";
            color = grey;

            cb1 [label="Cb1 (8221)"];
            cb2 [label="Cb2 (8222)"];
        }

    subgraph clusterCc {
            node [style=filled, color=lightgrey];
            label = "Connector C";
            color = grey;
    
            cc1 [label="Cc1 (8231)"];
            cc2 [label="Cc2 (8232)"];
        }

    subgraph clusterCd {
            node [style=filled, color=lightgrey];
            label = "Connector D";
            color = grey;
    
            cd1 [label="Cd1 (8241)"];
            cd2 [label="Cd2 (8242)"];
        }

    subgraph clusterCe {
            node [style=filled, color=lightgrey];
            label = "Connector E";
            color = grey;
    
            ce1 [label="Ce1 (8251)"];
            ce2 [label="Ce2 (8252)"];
        }

    subgraph clusterCf {
            node [style=filled, color=lightgrey];
            label = "Connector F";
            color = grey;
    
            cf1 [label="Cf1 (8261)"];
            cf2 [label="Cf2 (8262)"];
        }

    subgraph clusterCg {
            node [style=filled, color=lightgrey];
            label = "Connector G";
            color = grey;
    
            cg1 [label="Cg1 (8271)"];
            cg2 [label="Cg2 (8272)"];
        }

    subgraph clusterCh {
            node [style=filled, color=lightgrey];
            label = "Connector H";
            color = grey;
    
            ch1 [label="Ch1 (8281)"];
        }
 
    aga1 -> cl1;
    aga2 -> cl5;

    agb1 -> cl2;
    agb2 -> cl3;

    ca1 -> aga1;
    ca2 -> aga1;
    ca3 -> aga1;

    cb1 -> aga2;
    cb2 -> aga2;

    cc1 -> aga1;
    cc2 -> aga1;

    cd1 -> aga1;
    cd2 -> aga2;

    ce1 -> agb2;
    ce2 -> agb2;

    cf1 -> agb1;
    cf2 -> agb1;

    cg1 -> agb1;
    cg2 -> agb2;

    ch1 -> aga1;

}