Controlling the analysis of wide area networks

In a wide area network (WAN), where multiple logical connections emanate from a single physical interface, the IP Manager performs WAN analysis by default and diagnoses one of the following problems:

• Interface::Down, if the physical interface is operationally down, which explains why all of the subinterfaces that are layered over the physical interface have failed, along with any peer interfaces of those subinterfaces. Interface::Down alert is produced only for interfaces that do not have a discovered connection.

• Interface::LogicalConnectionDown, if two or more network connections at the subinterface level have failed and the physical interface is operationally up. “Interface” in “Interface::LogicalConnectionDown” represents the physical interface.

  Interface::LogicalConnectionDown, indicates a probable failure in the WAN network that does not cause a physical failure. The premise for the diagnosis is that a common but unobservable condition is causing all of the network connection failures.

  Whether or not the IP Manager performs WAN analysis is controlled by the SM_LOGICALCONNECTIONDOWN environment variable.

  Network connections at the subinterface level represent WAN circuits.

• NetworkConnection::Down, if just a single network connection at the interface or subinterface level has failed.