I am writing a controller to control ovs through openflow protocol. I found that when I dump flows from ovs using ovs-ofctl. It shows me so many fields prefixed with "NXM". And we plan to use "nxm packet_in_2" format. It also needs nicira extensions. So if the controller wants to communicate with ovs using openflow 1.3, I have to deal with nicira extensions. But I could not found any document about its format and the corresponding openflow message format. Could any one help me ? thanks.
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