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Google Cloud Certified Professional Cloud Network Engineer · Google Cloud
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One BGP session not established: This directly confirms that one of your routers isn't correctly peering with the Cloud Router, preventing traffic distribution.
The correct answer is D. BGP sessions are not established between both on-premises routers and the Cloud Router. When you have multiple VPN tunnels between your on-premises network and GCP, BGP is used to advertise routes between the two networks. If BGP sessions are not established between both on-premises routers and the Cloud Router, then the on-premises routers will not be able to learn about the routes that are advertised by the Cloud Router. This will cause all of the traffic to flow across the single VPN connection that is working.
To resolve this issue, you need to ensure that BGP sessions are established between both on-premises routers and the Cloud Router. You can do this by checking the BGP configuration on both the on-premises routers and the Cloud Router. You should also check the firewall rules on both the on-premises routers and the Cloud Router to ensure that they are not blocking the BGP traffic. Once you have verified that the BGP sessions are established and that the firewall rules are not blocking the traffic, you should be able to load-balance the traffic across both VPN connections.