Hi Carlos, I definitely agree with you that a positive acknowledgement is needed in OpenFlow; especially since the introduction of groups (and meters). In fact I made a proposal more than two years ago in ONF for this feature. Some were objecting it, as it would add complexity to the protocol, or as barriers can already provide similar function. So this feature never got into the specification.
My guess is that most people are still using OpenFlow in an OF 1.0 style, and so are fine without acknowledgements of any sort. Now that we are getting more and more OF 1.3 features supported in both controllers and switches I hope people will start using those features and realize the need for a light-weight positive acknowledgements. For now you can use barrier request/reply after messages to get the acknowledgment, or in OF 1.4 you execute one or more messages within a bundle. Regards, Zoltan From: openflow-discuss [mailto:openflow-discuss-boun...@lists.stanford.edu] On Behalf Of Carlos Ferreira Sent: Monday, May 05, 2014 7:35 PM To: openflow-discuss@lists.stanford.edu Subject: [openflow-discuss] OFP_FLOW_MOD response from OF Switch to Controller. Hi! Can anyone explain me why is that in the specs, there are error messages specified to respond to a bad configuration but, there is no specification for a simple OK of ACK message for a good configuration. Is there a good reason or a good programming principle for not specifying OK responses for successful configuration operations? -- Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - c...@av.it.pt<mailto:c...@av.it.pt> Skype & GTalk -> carlosmf.pt<http://carlosmf.pt>@gmail.com<http://gmail.com> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
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