What is the difference between regional and global dynamic routing mode?

Regional dynamic routing mode means routes learned by a Cloud Router in one region are only programmed into that region's subnets. Global dynamic routing mode propagates learned routes to all regions in the VPC, so an on-premises route learned in us-central1 is also reachable from europe-west1 subnets. Global mode is recommended for multi-region deployments but may require careful route priority management to avoid asymmetric routing.

How does Cloud Router handle failover between redundant VPN tunnels?

Cloud Router uses BGP to detect tunnel failures and automatically reroutes traffic to healthy tunnels. With BFD enabled, detection time drops to sub-second. You can influence path selection using MED (Multi-Exit Discriminator) values and route priorities in your advertised routes. For active/passive setups, assign a lower priority to the primary tunnel and higher priority to the backup.

GCP Cloud Router Config Builder

NetworkingGCP

Build Cloud Router configurations with BGP peering, custom route advertisements, and BFD settings.

Cloud Router Configuration

Build Cloud Router configurations with BGP peering, custom route advertisements, and BFD settings.

Required Fields

nameregionnetworkbgp.asnbgpPeers

{
  "name": "prod-router",
  "region": "us-central1",
  "network": "projects/my-project/global/networks/prod-vpc",
  "bgp": {
    "asn": 65001,
    "advertiseMode": "CUSTOM",
    "advertisedGroups": ["ALL_SUBNETS"],
    "advertisedIpRanges": [
      {
        "range": "10.128.0.0/20",
        "description": "Primary subnet us-central1"
      },
      {
        "range": "10.129.0.0/20",
        "description": "Secondary subnet us-central1"
      }
    ],
    "keepaliveInterval": 20
  },
  "bgpPeers": [
    {
      "name": "peer-onprem-primary",
      "interfaceName": "if-peer-onprem-primary",
      "ipAddress": "169.254.1.1",
      "peerIpAddress": "169.254.1.2",
      "peerAsn": 65002,
      "advertisedRoutePriority": 100,
      "advertiseMode": "DEFAULT",
      "enable": "TRUE",
      "bfd": {
        "sessionInitializationMode": "ACTIVE",
        "minTransmitInterval": 1000,
        "minReceiveInterval": 1000,
        "multiplier": 5
      }
    },
    {
      "name": "peer-onprem-secondary",
      "interfaceName": "if-peer-onprem-secondary",
      "ipAddress": "169.254.2.1",
      "peerIpAddress": "169.254.2.2",
      "peerAsn": 65002,
      "advertisedRoutePriority": 200,
      "advertiseMode": "DEFAULT",
      "enable": "TRUE"
    }
  ],
  "interfaces": [
    {
      "name": "if-peer-onprem-primary",
      "linkedVpnTunnel": "projects/my-project/regions/us-central1/vpnTunnels/tunnel-primary",
      "ipRange": "169.254.1.1/30"
    },
    {
      "name": "if-peer-onprem-secondary",
      "linkedVpnTunnel": "projects/my-project/regions/us-central1/vpnTunnels/tunnel-secondary",
      "ipRange": "169.254.2.1/30"
    }
  ]
}

Generated Output

Output will appear here...

About This Tool

Cloud Router is the backbone of dynamic routing in Google Cloud, managing BGP sessions for Cloud VPN, Cloud Interconnect, and Cloud NAT. It automatically learns and distributes routes between your VPC and connected networks, eliminating the need for static route maintenance. This builder helps you configure Cloud Routers with custom ASN assignments, BGP peer configurations, advertised route policies, and NAT gateway settings, generating deployment-ready gcloud commands or Terraform resources.

When to Use This Tool

•Configuring a Cloud Router with custom route advertisements to selectively announce VPC subnets to on-premises networks over Cloud VPN
•Setting up BGP sessions with specific peer ASNs, authentication keys, and BFD (Bidirectional Forwarding Detection) for fast failover
•Building a Cloud Router configuration that supports both Cloud NAT for outbound internet access and Cloud VPN for hybrid connectivity
•Planning regional vs global dynamic routing mode to control how learned routes are propagated across regions

Frequently Asked Questions

What is the difference between regional and global dynamic routing mode?: Regional dynamic routing mode means routes learned by a Cloud Router in one region are only programmed into that region's subnets. Global dynamic routing mode propagates learned routes to all regions in the VPC, so an on-premises route learned in us-central1 is also reachable from europe-west1 subnets. Global mode is recommended for multi-region deployments but may require careful route priority management to avoid asymmetric routing.
How does Cloud Router handle failover between redundant VPN tunnels?: Cloud Router uses BGP to detect tunnel failures and automatically reroutes traffic to healthy tunnels. With BFD enabled, detection time drops to sub-second. You can influence path selection using MED (Multi-Exit Discriminator) values and route priorities in your advertised routes. For active/passive setups, assign a lower priority to the primary tunnel and higher priority to the backup.

Related Learning Guides

VPC Network Design Patterns28 min read

Disclaimer: This tool runs entirely in your browser. No data is sent to our servers. Always verify outputs before using them in production. AWS, Azure, and GCP are trademarks of their respective owners.

GCP Cloud Router Config Builder

NetworkingGCP

Build Cloud Router configurations with BGP peering, custom route advertisements, and BFD settings.

Cloud Router Configuration

Build Cloud Router configurations with BGP peering, custom route advertisements, and BFD settings.

Required Fields

nameregionnetworkbgp.asnbgpPeers

Generated Output

Output will appear here...

About This Tool

When to Use This Tool

•Configuring a Cloud Router with custom route advertisements to selectively announce VPC subnets to on-premises networks over Cloud VPN
•Setting up BGP sessions with specific peer ASNs, authentication keys, and BFD (Bidirectional Forwarding Detection) for fast failover
•Building a Cloud Router configuration that supports both Cloud NAT for outbound internet access and Cloud VPN for hybrid connectivity
•Planning regional vs global dynamic routing mode to control how learned routes are propagated across regions

Frequently Asked Questions

What is the difference between regional and global dynamic routing mode?: Regional dynamic routing mode means routes learned by a Cloud Router in one region are only programmed into that region's subnets. Global dynamic routing mode propagates learned routes to all regions in the VPC, so an on-premises route learned in us-central1 is also reachable from europe-west1 subnets. Global mode is recommended for multi-region deployments but may require careful route priority management to avoid asymmetric routing.
How does Cloud Router handle failover between redundant VPN tunnels?: Cloud Router uses BGP to detect tunnel failures and automatically reroutes traffic to healthy tunnels. With BFD enabled, detection time drops to sub-second. You can influence path selection using MED (Multi-Exit Discriminator) values and route priorities in your advertised routes. For active/passive setups, assign a lower priority to the primary tunnel and higher priority to the backup.

Related Learning Guides

VPC Network Design Patterns28 min read