I have a few simple questions regarding netflow. Would anyone please clarify them for me?
1. I usually configured netflow with "ip route-cache flow" command. Anyway, I have seen articles mentioning "ip flow ingress" and "ip flow egress" commands. What is different exactly i.e. ip route-cache flow and ip flow ingress|egress? Which one should be used?
2. I understand netflow needs to be configured on every interface to export completely netflow data. Is it correct?
3. If there are 2 physical and 2 logical i.e. tunnel interfaces, how many/which interfaces should netflow be configured? Are only physical interfaces enough?
Please let me know if I misunderstand anything.
Thank you very much,