This, also accessible-for-notify, reports the virtual switch or PBB-TE tunnel name assigned to the given service, delivered as part of a fault notification so the trap itself identifies which specific transport construct the faulting service rides on. An admin uses this name embedded directly in the trap to immediately know which shared virtual switch or tunnel might be implicated, without a separate lookup, which matters because a fault on a shared transport construct could potentially affect other services riding the same virtual switch or tunnel. For example, a fault trap carrying cienaCesCfmServiceVsPbtName = 'VS-Core-Ring1' would immediately alert the admin to check whether other services sharing that same virtual switch are also affected.