sFlow data sources operate in a context of physical Ethernet port. To enable sFlow on Ethernet logical ports and their SAPs, an operator must explicitly enable sFlow on every physical Ethernet port that is a member of the specific logical port. Currently only LAG logical ports are supported (including MC-LAG).
For SAPs on a LAG, egress statistics increment based on ports used by each SAP on LAG egress while ingress statistics increment based on ports used by each SAP on LAG ingress unless LAG features like, for example, per-fp-ingress-queuing or per-fp-sap-optimization result in SAP statistics collection against a single LAG port.
If logical-level view is required, for example, per LAG statistics, a receiver is expected to perform data correlation based on per-physical port interface and SAP records exported for the logical port's physical ports and their SAPs. sFlow data records contain information that allows physical ports/SAP records correlation to a logical port. See sFlow record formats.