MEF-36-compliant performance monitoring

Junos OS supports performance monitoring that is compliant with Technical Specification MEF 36. You can enable MEF-36-compliant performance monitoring by configuring the measurement-interval statement at the [edit protocols oam ethernet cfm performance-monitoring] or [edit protocols oam ethernet cfm performance-monitoring sla-iterator-profiles profile-name] hierarchy level.
When MEF-36-compliant performance monitoring is enabled:

• The output for the field Current delay measurement statistics might display a measurement interval of 0 (zero) and an incorrect timestamp until the first cycle time has expired.
• Supported data TLV size for performance monitoring protocol data units (PDUs) is 1386 bytes when MEF-36-compliant performance monitoring is enabled. The TLV size is 1400 bytes in legacy mode.
• The maximum configurable value for the lower threshold bin is 4,294,967,294.
• Frame loss ratio (FLR) is excluded in loss measurements during period of unavailability for synthetic loss measurement only. In case of loss measurement, FLR is included even during period of unavailability.
• During a period of loss of continuity (adjacency down), although SOAM PDUs are not sent, FLR and availability calculations are not stopped. These calculations are performed with the assumption of 100% loss.
• The number of SOAM PDUs that are sent during the first measurement interval might be less than expected. This is because of a delay in detecting the adjacency state at the performance monitoring session level.
• The number of SOAM PDUs transmitted during a measurement interval for a cycle time of 100 ms might not be accurate. For example, in a measurement interval of two minutes with a cycle time 100 ms, the SOAM PDUs transmitted might be in the range of 1198-2000. When MEF-36-compliant performance monitoring is disabled, the show oam ethernet connectivity-fault-management maintenance-domain sla-iterator-history maintenance-domain md-name maintenance-association ma-name mep mep-id sla-iterator profile-name command displays 32 records from this Junos OS release onward. In earlier releases, the command displays 16 records.