Industrial Networks Driven by SDN Technology for Dynamic Fast Resilience

Round 1

Reviewer 1 Report

Please see the attached file. 

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

The manuscript presents a very relevant and hot topic. The objectives are well justified.

However, I have some comments/concerns/suggestions about the article:

1) When testing their resilience scheme, the authors use two topologies (industrial and sprint) and refer to previous figures in the article. This is slightly confusing to see the actual topologies (particularly because those figures contain more information apart from the topologies). 
I'd suggest that the authors add a specific figure showing the topologies to be tested in a clear manner.

2) Also related with the evaluation, I'm slightly concerned with the topologies being used. As far as I understand, they are wired topologies with gateways, and then gateways are directly connected to sensors.
Therefore, the main part of the topology (the one connected to the SDN controller) is somehow fixed, which drastically reduces the need for computing new paths.
However, the truth is that industrial networks based on SDN might rely on mobile gateways (UAVs) and sensors also move, and might need to rely on other sensors to reach the gateways.
Additionally, sensors do not usually support all SDN capabilities, so the approach of the authors could not be applied as evaluated.
What I mean with this is that the authors focused on industrial SDN, but on practice they evaluated their method on fixed meshed topologies, leaving the "hard parts" (mobile and constrained network nodes) aside from the problem.
In that sense, could we consider this solution a solution specifically designed for industrial SDN networks? I'm not sure about that...
Thus, I'm kindly asking the authors for an explanation about this. In my opinion, at least this should be appear as future work, because it's important.
(Additionally, I'd recommend the authors to check works like SDN-WISE, and papers about topics on hybrid networks or in-band control in SDN)

3) Their proposal calculates two paths. What happens if two failures occur and affect both two paths? Have the authors consider the cost of calculating a third path? 
This might seem not very probable, ok, but it is not impossible either, and industrial networks might grant fast resilience in all cases.
Some thought on this would be appreciated.

4) Finally, I'd recommend some writing and format polishing. The current status is ok, but it could be improved at some parts.

Author Response

please see the attachment

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The authors have replied to all my questions and suggestions. I'm satisfied with all answers and the manuscript has been updated accordingly.