This trap is sent to indicate that UPSR protection switch over occurred on the destination either through SNMP or CLI. If the module type is OCM for this trap, then after issuing this trap it goes into active mode The source is a 4 or 5 tuple specifying the type, location, shelf, slot ID, and optionally the port number of the source of the event. Each event has an unique event ID. It also has a preset event severity. The severity or trap type may be: critical, major, minor, or normal. For a given event severity, there is a corresponding system status, not necessarily the same as the event severity. For each reported trap, the IP address of the CP responsible for sending this trap is also included in the trap structure.