A pimNeighborLoss trap signifies the loss of an adjacency with a neighbor. This trap should be generated when the neighbor timer expires, and the router has no other neighbors on the same interface with a lower IP address than itself.
1.3.6.1.3.61.1.0.1
Trap : pimNeighborLoss Objects : { pimNeighborIfIndex } OID : "1.3.6.1.3.61.1.0.1" object : pimNeighborIfIndex type : InterfaceIndex