Configure Ha Vpn Active Passive Bgp Failover

What HA VPN with Cloud Router Advertised Priorities Is

HA VPN (High Availability VPN) combined with Cloud Router enables enterprise-grade site-to-site connectivity using dynamic routing via the Border Gateway Protocol (BGP). To implement deterministic traffic engineering such as an active/passive failover topology, Cloud Router allows network administrators to configure base advertised route priorities (which translate to Multi-Exit Discriminator (MED) values) across distinct BGP sessions.

How it meets the requirements

• Dynamic BGP routing: Cloud Router manages dynamic route propagation and retraction over the two HA VPN tunnels without requiring static route maintenance.
• Active/passive failover: By setting unequal advertised route priorities on the BGP sessions (for example, a lower numerical metric like 10 for the primary tunnel and a higher metric like 20 for the backup tunnel), Google Cloud ensures the on-premises gateway prioritizes the primary path while preserving seamless automated failover if the primary link goes down.

Key advantages and capabilities

• Automated topology updates: Dynamic BGP peering dynamically updates routing tables when routes change or links fail.
• SLA-backed reliability: HA VPN topologies configured with two interfaces and paired tunnels support an industry-standard 99.99% availability SLA.
• Deterministic path selection: Fine-grained control over advertised route priority values guarantees that egress and ingress flows adhere to organizational active/passive routing policies.
• Reduced operational complexity: Eliminates the operational overhead and fragility associated with manual static route configuration.

Why this is optimal

This approach directly aligns with Google Cloud networking best practices for hybrid failover. Setting unequal advertised route priorities on the Cloud Router BGP sessions provides active/passive routing natively over dynamic protocols while maintaining complete topology resiliency and high availability.