There is an MPLS-enabled link constantly flapping on an MPLS VPN network. Given that the network runs OSPF as the IGP protocol, which design mechanism will stabilize the network and avoid constant rec

BFD (Bidirectional Forwarding Detection) is designed to detect link failures faster and notify OSPF sooner, which would cause more frequent reconvergences on a flapping link - the opposite of the desired stabilization.

IP Event Dampening assigns a penalty each time an interface transitions to a down state and exponentially decays the penalty over time when the interface remains stable; when the cumulative penalty exceeds a configurable suppress threshold, the interface's state changes are no longer propagated to routing protocols like OSPF. This breaks the cycle of rapid reconvergence caused by a flapping link, allowing the rest of the MPLS VPN network to remain stable while the physical issue is resolved. It operates at the interface level without requiring changes to OSPF timers or the LDP control plane.

OSPF fast hellos reduce the dead interval to sub-second values, accelerating failure detection and triggering reconvergences more frequently rather than dampening them, which would worsen instability on a flapping link.

Partial SPF optimizes the speed of OSPF's Shortest Path First calculation for incremental topology changes, but it does not suppress or prevent the reconvergence events triggered by a repeatedly flapping link.