Your on-premises data center has 2 routers connected to your Google Cloud environment through a VPN on each router. All applications are working correctly; however, all of the traffic is passing…

Question

Options

• AThe on-premises routers are configured with the same routes.
• BA firewall is blocking the traffic across the second VPN connection.
• CYou do not have a load balancer to load-balance the network traffic.
• DThe ASNs being used on the on-premises routers are different.

• A
  6% (2)
• B
  3% (1)
• C
  11% (4)
• D
  80% (28)

Explanation

Cloud Router doesn't use ECMP across routes with different origin ASNs. For cases where you have multiple on-premises routers connected to a single Cloud Router, the Cloud Router learns and propagates routes from the router with the lowest ASN. Cloud Router ignores advertised routes from routers with higher ASNs, which might result in unexpected behavior. For example, you might have two on-premises routers advertise routes that are using two different Cloud VPN tunnels. You expect traffic to be load balanced between the tunnels, but Google Cloud uses only one of the tunnels because Cloud Router only propagated routes from the on-premises router with the lower ASN. https://cloud.google.com/network-connectivity/docs/router/support/troubleshooting#ecmp

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