Description: The version number of the filter specification. This is used to flag any changes in the statements that comprise a filter. Each time a modification occurs to an object in a filter spec (including the the list of filter statements of the same fltSpecIndex in filterStatementTable), the value of this object, and fltSpecVersion2 must be incremented. The manager adding, deleting, or modifying a filter statement or statements must increment this version number in the following manner.

A read of fltSpecVersion1 returns its current value. A write to fltSpecVersion1 must be one greater than its current value. A successful write of this object transfers ownership to the manager, where the manager must subsequently perform any desired modifications to the filter spec and then write the new value of fltSpecVersion1 to the fltSpecVersion2 object to release ownership.

When fltSpecVersion1 does not equal to fltSpecVersion2, the filter spec is in an inconsistent state. If the filter spec remains in an inconsistent state longer than the time specified in fltGlobalTimeout, the filter spec is declared invalid and the filter spec does not become active. The previously provisioned filter spec will remain active. If no previous filter spec was provisioned for this interface, a default action is used. It is up to the manager to fix the invalid filter spec and bring it into a consistent state.