The security appliance sends hello packets over the failover interface to monitor unit health. If the standby unit does not receive a hello packet from the active unit for two consecutive polling periods, it sends additional testing packets through the remaining device interfaces. If a hello packet or a response to the interface test packets is not received within the specified hold time, the standby unit becomes active.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: