This reports the combined/aggregated fault status that this switching node is forwarding onward to the next segment in a multi-segment pseudowire chain, summarizing whatever fault conditions, local or received from further upstream, need to be propagated to keep the rest of the MS-PW chain correctly informed. This aggregation is what allows a fault anywhere in a long MS-PW chain to correctly propagate all the way to both ultimate endpoints without every switching node needing full visibility into every other segment. If the far endpoint of an MS-PW sees a fault reported but the segment directly connected to it is healthy, checking this aggregated fault-to-next-hop value at each upstream switching node traces the fault back toward its true origin.