This value, despite being described as a Route Distinguisher in the source MIB, is carried in an L2VPN OAM trap to identify the remote site associated with the affected pseudowire, or zero if not applicable. An admin uses this to identify which remote VPLS site or endpoint the reported pseudowire event pertains to, particularly relevant in multipoint VPLS deployments with several remote sites. A nonzero hwL2vpnRmtSiteID in a trap helps the admin narrow down which specific remote site's connectivity may be affected.