Transit Network Design Patterns

Aviatrix Transit VPC provides a workflow to create a Transit VPC GW with a set of Spoke VPC GWs.

From one Aviatrix Controller, you can setup Transit network in a single region or across multiple AWS regions.

Single Region Transit VPC Design

The use case for this design is if you have one Direct Connect or Internet to VPC.

Aviatrix Transit VPC solution provides default network segmentation, a Spoke VPC has no connectivity to another Spoke VPC via the Transit GW. For example, you do not need to spin up a Dev Transit Group and a Production Transit Transit Group as none of the Spoke VPCs in either group can communicate with each other. As such, you do not need to spin up multiple Transit Groups for network isolation purpose. A diagram is shown below.

For connectivity between Shared Service VPC and Spoke VPCs, and between Spoke VPCs, choose AWS Peering or Aviatrix Encrypted Peering from the Controller console to setup.

Notice Transit GW is only used for traffic between on-prem and cloud (Spoke VPCs). Cloud to cloud traffic, such as Shared Service VPC to Spoke VPCs does not go through the Transit GW. Decouple the different traffic streams reduces the performance bottleneck and removes the single failure point.


A Spoke network can be deployed in a different region and different cloud (AWS and Azure).


Multi Regions Transit VPC Design

If you have datacenters in multiple regions and its corresponding AWS regions, you build network redundancy to reach cloud by leveraging AWS VGW termination.

In the diagram below, there are two Transit Groups, one in each region. The VGW has Direct Connect or Internet to one datacenter, the same VGW is also used as a backup connectivity over Internet from the second datacenter. In case a datacenter loses connectivity to VGW, the backup link can take over and route through the alternate route.

Note one Aviatrix Controller manages both Transit Groups. If you need connectivity between any two Spoke VPCs in each region, you can build an AWS Peering or Aviatrix Encrypted Peering from the Controller console.


Connected Transit Design

If you like to build a Transit network where all Spoke VPCs are connected via Transit GW, you can accomplish that by enabling “Connected Transit” property for the Transit GW. When Connected Transit is enabled, you do not need to build additional tunnels between shared service VPC to other VPCs. The diagram is shown below:


10Gbps Transit VPC Design

If you have applications that need 10Gbps bandwidth, you can place these applications in a VPC that terminates on the VGW with the 10Gbps VIF DX. Place the Aviatrix Transit GW in a separate VPC and connect it to the VGW through the normal Transit VPC workflow


Alternatively, you can place the high bandwidth application in a separate VPC that terminates directly on a VIF, as shown below.


Distributed Egress Control with Aviatrix

If you are using AWS NAT Gateway as your egress control for Internet access, consider using Aviatrix FQDN to improve egress control.

Aviatrix provides L7 FQDN to whitelists and blacklists public sites that applications in a Spoke VPC need to make API calls. The function is embedded in the Aviatrix gateway. It is transparent to user instances and requires no agents nor certs.


Centralized Third Party Firewall Integration

If you are running AWS Workspace services for your employees and need a full fledged firewall device, centralized third party firewall appliances can be deployed via Aviatrix Transit FireNet


Centralized Egress Control with Aviatrix


SD-WAN Integration

Aviatrix Multi-cloud Transit integrates with SD-WAN cloud instances with BGP over LAN where both BGP routes and data packets are exchanged between Aviatrix Transit Gateways and SD-WAN gateways deployed in the same Transit VPC, as shown in the diagram below. .