This read-only INTEGER reports the operational state of a VSI logical interface as the slave has communicated it to the master, distinguishing removed, active, failedExternal (such as a line alarm), and failedInternal (a local hardware fault) conditions. An administrator uses this to quickly tell whether a logical interface's problem originates externally, such as a cable or line alarm, or internally within the switch's own hardware. For example, a logical interface reported as failedExternal points the admin toward checking the physical link and remote end rather than the local switch hardware.