This page describes the strategy to move from Classic VPN to HA VPN.
For more information about Cloud VPN, see the Cloud VPN overview.
For definitions of terms used on this page, see Key terms.
Consider the following as you plan a migration to HA VPN:
Your peer VPN device or service must support the Border Gateway Protocol (BGP). If it does not, you cannot use HA VPN.
The external IP address of your Cloud VPN gateway cannot be preserved. When you create an HA VPN gateway, two new external IP addresses are created. Google Cloud selects these IP addresses from two different pools as part of the high availability (HA) design.
You cannot migrate an existing Cloud VPN tunnel or tunnels on a Classic VPN gateway to an HA VPN gateway. Instead, you need to create new tunnels and delete the old ones.
Migrating to HA VPN means that you can only use features supported on HA VPN connections. For example, you cannot connect a Classic VPN gateway to an HA VPN gateway.
Creating Cloud Routers
When configuring a new HA VPN gateway, you can create a new Cloud Router, or you can use an existing Cloud Router with existing Cloud VPN tunnels or VLAN attachments. However, the Cloud Router that you use must not already manage a BGP session for a VLAN attachment associated with a Partner Interconnect connection because of the attachment's specific ASN requirements.
To move from Classic VPN to HA VPN gateways and tunnels, perform the following steps:
- Create a new HA VPN gateway, Cloud Router, and VPN tunnels to connect your Virtual Private Cloud network to your peer network. The new HA VPN gateway that you create has two new external IP addresses.
- Verify that the new tunnels are working, and check the configuration of your HA VPN gateway for high availability.
- Delete the tunnel or tunnels connected to the Classic VPN gateway. If the previous VPN tunnel or tunnels were policy-based or route-based, remove any leftover custom static routes.
- Delete the Classic VPN gateway and release any static external IP addresses that it used.
- To find resources for maintaining VPN tunnels and gateways, see the Maintaining VPNs how-to guides.
- To use high-availability and high-throughput scenarios or multiple subnet scenarios, see Advanced configurations.
- To help you solve common issues that you might encounter when using Cloud VPN, see Troubleshooting.