A notification indicating that number of PPPoE session initiated via a particular interface has dropped below the configured value for that interface. The interface details can be referred via ifDescr object, and the configured watermark can be referred through cPppoePerInterfaceSessionLossThreshold object. There will be only one trap send whenever count drops, further low count won't generate trap. Number of PPPoE sessions count need to cross the watermark and drop below watermark to generate trap again. An agent must not generate more than one cPppoePerInterfaceSessionLossThresholdTrap `trap-event` in a 30 second period, where a `trap-event` is the transmission of a single trap PDU to a list of trap destinations. If the PPPoE session count keep on fluctuating around the watermark during 30 seconds, then these trap-events should be suppressed by agent.