digraph G {
    node [ shape=box ]
    rankdir=LR;

    label="Anycasting\nAll locations announce same IPs\nRouting based traffic shaping"

    internet [ label="The internet" shape=oval ]
    internet->upstreamrouter1 [ label="Forward traffic for A.B.C.D/24" ]
    internet->upstreamrouter2 [ label="Forward traffic for A.B.C.D/24" ]
    internet->upstreamrouter3 [ label="Forward traffic for A.B.C.D/24" ]

    subgraph cluster_pop1 {
        label="PoP 1"
        router1 [ label="Our router" ];
        upstreamrouter1 [ label="Upstream router" ];
        router1->upstreamrouter1 [ label="Announces A.B.C.D/24" ]
    }
    clients1 [ label="Client set 1" ]
    clients1->internet [ label="Access via Internet" ]
    clients1->router1 [ label="Using PoP 1\nGeographic location not guaranteed to be nearest" style=dashed ]

    subgraph cluster_pop2 {
        label="PoP 2"
        router2 [ label="Our router" ];
        upstreamrouter2 [ label="Upstream router" ];
        router2->upstreamrouter2 [ label="Announces A.B.C.D/24" ]
    }
    clients2 [ label="Client set 2" ]
    clients2->internet [ label="Access via Internet" ]
    clients2->router2 [ label="Using PoP 2\nGeographic location not guaranteed to be nearest" style=dashed ]

    subgraph cluster_pop3 {
        label="PoP 3"
        router3 [ label="Our router" ];
        upstreamrouter3 [ label="Upstream router" ];
        router3->upstreamrouter3 [ label="Announces A.B.C.D/24" ]
    }
    clients3 [ label="Client set 3" ]
    clients3->internet [ label="Access via Internet" ]
    clients3->router3 [ label="Using PoP 3\nGeographic location not guaranteed to be nearest" style=dashed ]



}