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It is not possible to use the NE_BARRIER enumerator as the Type field of a FlagAttRec structure.
The NE_BARRIER enumerator has not yet been implemented into the NetEngine library. The online help topic FlagAttRec should not mention this enumerator.
At a future version of NetEngine, the NE_BARRIER enumerator may be implemented as a valid Type value for the FlagAttRec structure. The designed intent of this type of flag is for a barrier to be placed anywhere on any element (most probably an EDGE) of a netview, and subsequently solved operations will not allow a path to traverse through the barrier overriding what is currently set as weights on that element.
The two alternative solutions listed below allow you to block off an entire element from the solver; however, there is currently no way to block off only a portion of an edge, as the NE_BARRIER will provide.