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<p>Dear OVSers, <br>
</p>
<p>I am working in adding some restoration capabilities to my SDN
controller app. I am in the design phase and I thinking of the
implications of using break-before-make or make-before-break
strategies. <br>
</p>
<p>If I use break-before-make, there is no problem because I replace
the rules and that is. However for the make-before-break approach,
I foresee that there will be some flow rules with the same match
fields but different action fields. (e.g, t0: in_port: 3 ->
out_port: 2 vs t1: in_port: 3 -> out_port:4, where t0 means
time0 and t1 means time1 and t1 > t0 (older time instant) ). I
know I could handle that with priorities but I think this may add
further complexity to the SDN controller app. <br>
</p>
<p>I am wondering if I can skip this treatment at the SDN controller
app making use of how OVS applies/evaluates rules in the flow
table. More specifically, rules in the flow table of OVS (for the
same priority) are evaluated in any time order? That is, OVS is
considering "t1 rule" (which is more recent than the one of t0)
before than "t0 rule" (however, t0 rule will be erased
afterwards)? Or are the flow-rules in the flow table
ordered/evaluated "randomly"? Additionally, has this changed
through the OVS versions? <br>
</p>
<p>Thanks in advance for your suggestions,</p>
<p>Jordi<br>
</p>
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<p><span style="font-size: 10pt;"><strong>Jorge Baranda</strong>
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