To allow per SAP sFlow statistics export, operators must configure ingress and egress sFlow counter maps. The counter maps are required, because SR OS systems support more granular per policer/queue counters and not IF-MIB counters per VLL/VPLS SAPs. In an absence of a map configured, 0's are returned in corresponding statistics records.
A single ingress and a single egress counter map are supported. The maps specify which ingress and which egress SAP QoS policy queue/policer statistics map to sFlow unicast, multicast, and broadcast counters returned in an sFlow SAP record. Multiple queues and/or policers can map to each of unicast, multicast, broadcast counters. A single queue/policer can only map to one type of traffic. Queues, policers configured in a SAP QoS policy but not configured in an sFlow map or the other way around are ignored when sFlow statistics are collected.