A ciscoIetfPimExtRPMappingChange notification signifies a change in the RP Mapping on the device in question. A change in RP Mapping could be because of addition of new entries to the RP Mapping cache, deletion of existing entries, or a modification to an existing mapping. The type of change is indicated by cpimRPMappingChangeType. cpimExtRPSetHoldTime is used to identify the row in the cpimExtRPSetTable that is responsible for the generation of this notification. In case of modification to existing entries, a notification should be generated once before the modification (with cpimRPMappingChangeType set to 'modifiedOldMapping') and once after modification (with cpimRPMappingChangeType set to 'modifiedNewMapping'). NOTE: A high frequency of RP Mapping change could result in a large number of ciscoIetfPimExtRPMappingChange notifications being generated. Hence, in environments where the possibility of a high frequency of RP Mapping change exists, enable this notification with utmost care.