Your on‑prem BGP speaker advertises a prefix that exactly matches a VPC subnet already present in Google Cloud. What will Google Cloud do with the learned route?
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Correct answer: Ignore the learned route because the subnet exists locally in the VPC; local subnet takes precedence..
Why this is the answer
Google Cloud prioritizes locally defined VPC subnets over routes learned via BGP from external sources. If an on-premises BGP speaker advertises a prefix that exactly matches an existing VPC subnet, Google Cloud will ignore the learned route. This behavior ensures that traffic destined for resources within the VPC subnet is always routed internally within Google Cloud, maintaining network stability and predictability. It prevents external routing configurations from inadvertently overriding or blackholing internal VPC traffic. Google Cloud will not install the learned route, convert it to host routes, or terminate the BGP session due to this specific conflict.
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