Sample topology for data transfer

The following topology shows a VPC network and two on-premises sites. Each on-premises site connects to Google Cloud by using a Router appliance spoke. The two on-premises sites can use Google's network to exchange data with each other.

Router appliance topology
Router appliance topology (click to enlarge)
  1. On-premises Customer network A and Customer network B are each connected through customer premises equipment (CPE) to a router appliance instance. CPEs typically use a connectivity mechanism, such as an SD-WAN overlay tunnel or an IPsec VPN tunnel, to establish connectivity with the router appliance instance.

    Each router appliance instance is located in the Google Cloud region closest to its associated customer network. Both router appliance instances are in a single VPC network. However, the router appliance instances are in different regions. For this reason, the VPC network has its dynamic routing mode set to global.

  2. Both router appliance instances are attached as spokes to the Network Connectivity Center hub. Because Customer network A and Customer network B need to send data to each other, both spokes have the site-to-site data transfer field enabled.

    You can use site-to-site data transfer only in supported locations. For more information, see Locations supported for data transfer.

  3. In each region, a router appliance instance establishes Border Gateway Protocol (BGP) peering with the appropriate Cloud Router. Each Cloud Router receives and advertises route prefixes from the corresponding on-premises location.

  4. The Cloud Routers dynamically exchange all received routes with each other. This configuration provides end-to-end dynamic route exchange and data plane connectivity between Customer network A and Customer network B.

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