Teemu Koponen wrote:
On Mar 8, 2010, at 21:32 , kk yap wrote:
I might be wrong, but from my understanding there is nothing in
OpenFlow that dictates reliable execution of commands received.
btw; I can't resist and comment this by saying that unreliable (silently
dropped) control plane operations of OF complicate development of any
controller quite a bit. To this date, I haven't heard a valid reason why the
protocol semantics should be such for any of the OF messages. No, overload
conditions are not such a reason.
I absolutely agree, this needs to be fixed in the OpenFlow
specification. Else, it is near impossible to build scalable
controllers who maintain consistent state. The only caveats to consider
would be for packet ins (we can maintain the best effort delivery model
for datagram forwarding) and potentially flow expirations due to
inactivity timers.
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