Campus Network

digraph Campus {
  rankdir=TB;
  graph [bgcolor="transparent", splines=ortho, nodesep=0.5, ranksep=0.8, fontname="Inter"];
  node [shape=box, style="rounded,filled", fontname="Inter", fontsize=11];

  ISP [fillcolor="#fde68a", label="ISP / Internet"];
  EdgeRtr [fillcolor="#fee2e2", label="Edge Router\n(BGP)"];
  Core1 [fillcolor="#dbeafe", label="Core Switch A"];
  Core2 [fillcolor="#dbeafe", label="Core Switch B"];

  subgraph cluster_f1 {
    label="Floor 1"; color="#16a34a"; style=rounded;
    Acc11 [fillcolor="#dcfce7", label="Access Sw 1-A"];
    Acc12 [fillcolor="#dcfce7", label="Access Sw 1-B"];
    AP1   [fillcolor="#fef9c3", label="AP-1"];
  }
  subgraph cluster_f2 {
    label="Floor 2"; color="#16a34a"; style=rounded;
    Acc21 [fillcolor="#dcfce7", label="Access Sw 2-A"];
    Acc22 [fillcolor="#dcfce7", label="Access Sw 2-B"];
    AP2   [fillcolor="#fef9c3", label="AP-2"];
  }
  subgraph cluster_dmz {
    label="DMZ"; color="#dc2626"; style=rounded;
    FW   [fillcolor="#fecaca", label="Firewall"];
    Web  [fillcolor="white", label="Web srv"];
    Mail [fillcolor="white", label="Mail srv"];
  }
  ISP -> EdgeRtr -> FW;
  EdgeRtr -> Core1; EdgeRtr -> Core2;
  Core1 -> Core2 [dir=both, style=dashed, label="VRRP"];
  Core1 -> Acc11; Core1 -> Acc21;
  Core2 -> Acc12; Core2 -> Acc22;
  Acc11 -> AP1; Acc21 -> AP2;
  FW -> Web; FW -> Mail;
}