Dear OVSers,
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.
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.
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?
Thanks in advance for your suggestions,
Jordi
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*Jorge Baranda*
Senior Researcher, MsC
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