LogicalConnectionDown indicates a fault within the Wide Area Network, which could be, for example, a Frame Relay cloud. IP Availability Manager isolates the problem to the nearest physical interface by using only symptoms from the logical layer. LogicalConnectionDown is only diagnosed when there are no failure symptoms at the physical layer and the network adapter is a physical interface with subinterfaces layered over it.
The events used to diagnose LogicalConnectionDown are also used to diagnose network adapter Down. However, for LogicalConnectionDown, the DownOrFlapping event for the interface is not present.
The events used to diagnose LogicalConnectionDown include:
Network Adapter DownOrFlapping
System MightBeDown for all logically connected systems