Hi Sorry to bother others. In order to establish packet forwarding between switches, the rule should be sent to switch before the first packet is sent back. The race condition is the packet is sent back and even forwarded by the first switch, but it doesnt find a rule in the second switch although openflow command is already sent. I was told that conditions like this were resolved after nox 0.5. My version is 0.5.0-full-beta, but I still find this happens occasionally. Is there any other requirement on the version? Also, how did you gaurrantee these conditions are resolved. Did you try to control the delay of the packets on wire? Thanks.
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