Thanks Luca. Is this implementation takes care of interop with traditional switch MSTP? As my main concern was loop formation with traditional switch. For example: consider a triangle topology with one OF switch and two traditional switch or two OF switch and one traditional switch. Here OF switches does not form loop by itself but with traditional switch, there is loop, because tradition switch will not received BPDU from OF switches (or from controller on behalf of OF switches) and this will make traditional switch to open its interfaces connected with OF switches.
I think, we need OpenFlow spec support to extend data structure and controller's support to extend API framework to allow traditional control plane protocols in controller (centralized environment) for OF switches that does not have their own control plane and entirely depend on controller. -Sudeep
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