This example toplogy contains 2 large regions (NYC and SJC) and a small region (SYD). Each region has 3 VLANS:
Production: for products serving customersInfrastructure: for internal infrastructure
servicesEgress: for VMs which have Internet egress access via a
NAT gatewayWhile the large regions have the Production and
Infrastructure subnets segmented per rack, the smaller SYD
region has all subnets covering the entire region.