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An enterprise is designing high-availability dynamic routing between their Google Cloud Virtual Private Cloud (VPC) network and a secondary cloud environment. They have configured redundant dynamic routing sessions using Cloud Router and Border Gateway Protocol (BGP).
During testing, network engineers observe that when a transit link or intermediate forwarding path fails without tearing down the physical interface, standard BGP hold timers take up to several tens of seconds to declare the peer dead and reroute traffic.
Which feature should you configure on the Cloud Router BGP sessions to rapidly detect forwarding path failures and achieve fast failover?
Bidirectional Forwarding Detection (BFD) is a lightweight, low-overhead networking protocol designed to rapidly detect communication failures along the data path between two forwarding engines or routing peers.
Standard Border Gateway Protocol (BGP) implementations rely on periodic keepalive messages (often sent every 20–30 seconds, with hold timers around 60–90 seconds) to determine neighbor liveness. If an intermediate switch, transit provider, or link suffers an unannounced forwarding path outage, BGP takes tens of seconds to time out before invalidating the route.
By enabling BFD for Cloud Router, the router sends microsecond-to-millisecond control packets across the session. When packet loss indicates the path is down, BFD immediately signals the routing daemon on Cloud Router to tear down the BGP session and invalidate routes, rerouting traffic across redundant paths in sub-second or low-second intervals.
Enabling BFD directly resolves the issue of delayed failover caused by standard BGP hold timers, fulfilling the strict high-availability requirements of enterprise multicloud networking.
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