Inline performance monitoring

Junos OS supports inline mode for MEF 35 compliant service OAM performance monitoring on routers. Performance monitoring functions include measurement of Ethernet frame delay, frame delay variations, frame loss, and availability of service. By default, performance monitoring packets are handled by the CPU of a line-card, such as Modular Port Concentrator (MPC). Enabling inline mode of performance monitoring delegates the processing of the protocol data units (PDUs) to the forwarding ASIC (that is, to the hardware). By enabling inline mode of performance monitoring, the load on the CPU of the line-card is reduced and you can configure an increased number of performance monitoring sessions and achieve maximum scaling for service OAM performance monitoring sessions. Inline mode of performance monitoring is supported only for proactive mode of frame delay measurement (Two-way Delay Measurements) and synthetic loss measurements (SLM) sessions. Performance monitoring functions configured using the iterator profile (CFM) are referred to as proactive performance monitoring. Inline mode of performance monitoring for frame loss measurement using service frames (LM) is not supported.