From: mark_cruzNOTFORSPAM@hotmail.com   
      
   Hello,   
      
   I'm trying to dive into these new concepts, SDN and OpenFlow. One thing that   
   is not clear to me, is how the traditional routing (OSPF, BGP etc.) done in   
   SDN, or it is completely gone and replaced with some lightweight mechanisms   
   instead?   
      
   I understand that by SDN design, switches/routers are becoming merely   
   forwarders with minimum intelligence, and the major work is done by network   
   controller(s) communicating with switches via OpenFlow protocol. But does   
   traditional routing still exists in and runs on controllers ?   
      
   I would appreciate any hints, links to get better understanding on this.   
   Thanks!   
      
   Mark   
      
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