digraph pbr_tunnel
{
    rankdir = LR;

    node [shape = box];
    PROVISIONER [label = "PBR Client\n(Provisioner)"];
    RELAY       [label = "PBR Server"];
    PROVISIONEE [label = "Provisionee", style = filled, fillcolor = darkseagreen];

    node [shape = ellipse];
    NETWORK     [label = "Mesh network", fillcolor = "azure2", style = filled];

    PROVISIONER -> NETWORK -> RELAY -> PROVISIONEE;
}

