: VPC network peering model
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VPC network peering model

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VPC network peering model

VPC Network Peering enables you to create a hub and spoke topology to secure many VPC networks with VM-Series. Unlike the multiple interface architecture, VPC peering enables you to connect and disconnect up to 25 workload VPCs as needed. In this architecture, the trust VPC serves as a hub network for workload VPCs which are connected as spoke networks. Each spoke VPC network has custom or policy-based routes to steer inter-VPC and intra-VPC traffic to the internal load balancer in the hub network.
In the configuration displayed in the previous diagram, the VM-Series firewalls inspect the traffic as follows:
  1. Traffic from the internet to applications in the spoke networks is distributed by the external passthrough load balancer to the VM-Series untrust interfaces (NIC0). The VM-Series firewall inspects the traffic and forwards permissible traffic through its trust interface (NIC2) to the application in the spoke network.
  2. Traffic from the spoke networks destined to the internet are routed to the internal load balancer in the hub VPC. The VM-Series firewall inspects the traffic and forwards permissible traffic through its untrust interface (NIC0) to the internet.
  3. Traffic between spoke networks or traffic within a spoke network (routed via policy-based route) is routed to the internal load balancer in the hub VPC. The VM-Series firewall inspects and forwards the traffic through the trust interface (NIC2) into the hub network which routes permissible traffic to the destination spoke network.

Combining the Architectures

If you require transitive routing and security for more than 25 VPC networks, you can combine the multiple network interface and VPC peering architectures together. In this architecture, each additional dataplane interface serves as a hub network which can have up to 25 spoke VPC networks. Full transitive routing across the spoke networks and hubs is supported.