Google Cloud Router

  • Cloud Router is a fully distributed and managed Google Cloud service that helps you define custom dynamic routes and scales with your network traffic.

Features

  • It works with both legacy networks and Virtual Private Cloud (VPC) networks.
  • Cloud Router utilizes Border Gateway Protocol (BGP) to exchange routes between your Virtual Private Cloud (VPC) network and your on-premises network.
  • Using Cloud Router is required or recommended in the following cases:
    • Required for Cloud NAT
    • Required for Cloud Interconnect and HA VPN
    • A recommended configuration option for Classic VPN
  • When you extend your on-premises network to Google Cloud, use Cloud Router to dynamically exchange routes between your Google Cloud networks and your on-premises network.
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  • Cloud Router peers with your on-premises VPN gateway or router. The routers exchange topology information through BGP.

Route advertisements

  • Through BGP, Cloud Router advertises the IP addresses of Google resources that clients in your on-premises network can reach. Your on-premises network then sends packets to your VPC network that have a destination IP address matching an advertised IP range. After reaching Google Cloud, your VPC network’s firewall rules and routes determine how Google Cloud route the packets.
  • Default Route Advertisement – Cloud Router advertises subnets in its region for regional dynamic routing or all subnets in a VPC network for global dynamic routing.
  • Custom Route Advertisement – You explicitly specify the routes that a Cloud Router advertises to your on-premises network.

Reference:
https://cloud.google.com/network-connectivity/docs/router/concepts/overview

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