A pimInterfaceStateChange trap signifies that the OperStatus of the interface has changed. - If the reported OperStatus is operStatusDown, the interface is in a normal inactive state. It is waiting for the administrator to activate it, or for its parent row(s) to activate or recover from failures. - If the reported OperStatus is operStatusGoingUp, the interface is activating. - If the reported OperStatus is operStatusUp, the interface is active, and hence can be used to send and receive PIM messages. - If the reported OperStatus is operStatusGoingDown, the interface is deactivating asynchronously, due to either administrative action or loss of a prerequisite, for example, failure of a parent row. - If the reported OperStatus is operStatusFailed, the interface is in an inactive state due to a failure, but the failure might clear without administrative action. - If the reported OperStatus is operStatusFailedPerm, the interface is in an inactive state due to a failure, and the failure will not clear without administrative action. - If the reported OperStatus is operStatusFailing, the interface is deactivating asynchronously, due to a failure. This trap is not generated if pimTmEntMgmdProxy is set to 'false' and pimTmEntMode is set to 'mgmd-snooping' or 'mgmd-proxy'.