Hi all,
 Yes indeed, i would like to echo this question too...If SDN has to really
catch on with Service Providers they need to include other layers too
isnt it?
Thanks
Sitaraman

> Hi all,
>
> Just wondering if the openflow switches still have network layer? Although
> they are depicted as only functioning at link layer and below, I wonder
> how
> a controller can do routing w/o support from switches.
>
> Also, it seems more apparent that they don't have transport layer.
> However,
> if the control channel is implemented as in-band, transport layer is also
> needed at each switch, isn't it?
>
> Thanks for any clarification.
>
> Daniel
>
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