This notification signifies that the SNMP entity, acting as an agent, has detected that one of its NHRP entities perceives that it has lost the protocol-to-NBMA address binding information for an NBMA next hop(which it earlier had). An NHRP entity might maintain multiple cache entries, with the same address binding information, for the same next hop peer (corresponding to different destinations reachable via this next hop peer); This notification will be be sent only when the address binding information is lost meaning only when all such entries are deleted. This notification will be be sent only once for a 'down' event i.e. two consecutive cneNotifNextHopPeerDown notifications (for the same NHP) must always be interspersed by a cneNotifNextHopUp notification(for the same NHP).