This notification signifies that the SNMP entity, acting as an agent, has detected that one of its NHRP entities perceives that it has learnt the protocol-to-NBMA address binding information for an NBMA next hop(which it didn't have). An NHRP entity might learn the same address binding information for a next hop peer as part of multiple address resolutions; this notification should be sent only when it first learns this address binding information.