The Benefits of Link Failure Propagation in High Availability Networks
Network failures are going to happen. This unfortunate fact is probably why the industry standard for High Availability (HA) Networks is not 100%, but rather the "five nines", or 99.999% availability. To achieve this lofty goal, most HA networks use Link Failure Propagation (LFP) in their network design to ensure that their up-time is as close to continuous as it's possible to get.
Typically, systems that require high availability rely on a primary network to run things normally with a backup network standing by to step in should the primary fail for any reason.
Link Failure Propagation
Propagating failure might seem like a strange thing to want, but in a network system, when a single link goes down, it could jeopardize all the other connections as well without alerting admin. In LFP, that single failure results in the entire operation being moved to the backup system immediately, resulting in less downtime.