A count of Mac Address notifications sent.
hpicfMacNotifyEnable must be enabled for the
counter to be activated.
This number is incremented each time a Mac
Address Table Change learn/move/remove occurs
on a hpicfMacNotifyTrapConfig enabled interface
or when hpicfMacNotifyMoveEnable is enabled.
This count will include notifications that
are dropped due to buffering overflow during
high activity.
hpicfMacNotifyCount is initialized to zero
at boot.