cucsSwEthLanBorderUdldMsgInterval is a Gauge32 value configuring how often UDLD hello messages are sent across the uplinks of the LAN border domain on a Cisco UCS fabric interconnect, the object that groups its northbound Ethernet uplinks toward the customer network (a cucsSwEthLanBorder row). An admin tunes this interval to balance how quickly a one-way link failure is detected against the extra control-plane traffic more frequent messages generate. For example, shortening this interval on the LAN border domain would let UCS Manager detect a unidirectional link problem sooner, at the cost of slightly more UDLD traffic.