Add cdn traffic routing/shaping information

cdn-anycast.dot

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+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 ]
+
+
+
+}

cdn-geodns.dot

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+digraph G {
+    node [ shape=box ]
+    rankdir=LR;
+
+    label="GeoDNS\nAnswering DNS based on Source IP of the clients\nUsually different IPs per Pop"
+
+    geodns [ label="DNS server with GeoDNS policies enabled" shape=oval ]
+
+    subgraph cluster_pop1 {
+        label="Pop 1"
+        router1 [ label="Our router" ];
+        upstreamrouter1 [ label="Upstream router" ];
+        router1->upstreamrouter1 [ label="Announces A.B.1.D/24" ]
+    }
+    clients1 [ label="Client set 1" ]
+    clients1->geodns [ label="Q: Where is domain example.com?" ]
+    geodns->clients1 [ label="A: On an IP of Pop 1" ]
+    clients1->router1 [ label="Using Pop 1 via pop specific IPs" ]
+
+    subgraph cluster_pop2 {
+        label="Pop 2"
+        router2 [ label="Our router" ];
+        upstreamrouter2 [ label="Upstream router" ];
+        router2->upstreamrouter2 [ label="Announces A.B.2.D/24" ]
+    }
+    clients2 [ label="Client set 2" ]
+    clients2->geodns [ label="Q: Where is domain example.com?" ]
+    geodns->clients2 [ label="A: On an IP of Pop 2" ]
+    clients2->router2 [ label="Using Pop 2 via pop specific IPs" ]
+
+    subgraph cluster_pop3 {
+        label="Pop 3"
+        router3 [ label="Our router" ];
+        upstreamrouter3 [ label="Upstream router" ];
+        router3->upstreamrouter3 [ label="Announces A.B.3.D/24" ]
+    }
+    clients3 [ label="Client set 3" ]
+    clients3->geodns [ label="Q: Where is domain example.com?" ]
+    geodns->clients3 [ label="A: On an IP of Pop 3" ]
+    clients3->router3 [ label="Using Pop 3 via pop specific IPs" ]
+
+
+
+}

cdn-geoip.dot

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+digraph G {
+    node [ shape=box ]
+    rankdir=LR;
+
+    label="GeoIP\nThe CDN decides what to do based on the source IP\nAn inside CDN decision"
+
+    clients1 [ label="Client set 1" ]
+    clients1->edgenode1 [ label="Access content served by CDN" ]
+    clients2 [ label="Client set 2" ]
+    clients2->edgenode2 [ label="Access content served by CDN" ]
+    clients3 [ label="Client set 3" ]
+    clients3->edgenode3 [ label="Access content served by CDN" ]
+
+    subgraph cluster_pop1 {
+        label="Any Pop"
+        edgenode1 [ label="Edge Node" ]
+        rules1 [ label="Tenant/Domain specific rules" shape=oval ]
+        edgenode1->rules1 [ label="Q: What to do with IP of client set 1?" ]
+        rules1->edgenode1 [ label="A: (f.i.) Display \"Not available in this country\"" ]
+
+        edgenode2 [ label="Edge Node" ]
+        edgenode2->rules1 [ label="Q: What to do with IP of client set 2?" ]
+        rules1->edgenode2 [ label="A: (f.i.) Display \"Server from a particular origin\"" ]
+
+        edgenode3 [ label="Edge Node" ]
+        edgenode3->rules1 [ label="Q: What to do with IP of client set 3?" ]
+        rules1->edgenode3 [ label="A: (f.i.) Display \"Server content as usual\"" ]
+
+    }
+
+}