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Let's say you run a high traffic high risk app and need to guarantee a maximum availability.  And you have 3 VPC's each containing services that together form a geo cluster. Each VPC in this circle must be able to reach each other VPC.  in this example each VPC will have 2 VPC peering connections.

Requirements

Limits

• VPC peering connections are not possible between VPC's with matching or overlapping VPC CIDR blocks
• VPC peering connections are not transitive in the sense that VPC's will not automatically gain access to a 3rd VPC via a VPC that is peered with that 3rd VPC.
• VPC peering connections are only possible within a CloudStack region
• There is a maximum amount of pending VPC peering requests per VPC
• There is a maximum amount of active VPC peering connections
• There is an expiry time on the pending VPC peering requests

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