1.Explain how to output to the ingress port in OpenFlow
https://mail.openvswitch.org/pipermail/ovs-dev/2013-September/275338.html
2.Resubmit vs Recirculate
https://mail.openvswitch.org/pipermail/ovs-discuss/2013-August/030733.html
3. Why are there so many different ways to dump flows?
Open vSwitch has two kinds of flows (see the previous question), so it has commands with different purposes for dumping each kind of flow:
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ovs-ofctl dump-flows <br>dumps OpenFlow flows, excluding hidden flows. This is the most commonly useful form of flow dump. (Unlike the other commands, this should work with any OpenFlow switch, not just Open vSwitch.) -
ovs-appctl bridge/dump-flows <br>dumps OpenFlow flows, including hidden flows. This is occasionally useful for troubleshooting suspected issues with in-band control. -
ovs-dpctl dump-flows [dp]dumps the datapath flow table entries for a Linux kernel-based datapath. In Open vSwitch 1.10 and later, ovs-vswitchd merges multiple switches into a single datapath, so it will show all the flows on all your kernel-based switches. This command can occasionally be useful for debugging. -
ovs-appctl dpif/dump-flows <br>, new in Open vSwitch 1.10, dumps datapath flows for only the specified bridge, regardless of the type.