Hello Sorry to bother others. My program is to redirect flows according to some metric in a topology of loops, 5 switches. I need to accurately query flow sizes from counters. For one flow, I will query its size from the egress switch. I find that: 1, Querying sizes from the ingress switch has many problems, because you have no idea whether the first packet will update the counter. Although the first packet is sent to the outport directly, sometimes it still update the counter, sometimes it will not. I am wondering how can it update the counter if it is sent to the outport directly from the controller. 2, Querying egress switch sometimes has the same problem, but it is more stable. Occasionally (with small probability), a packet gets through the switch without updating the counter (Because I saw no flow_in event is generated). I am wondering what are the possible reasions for this. Thanks.
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