> ....Dave the option you were mentioning would still dependent > on the control plane, negating some of the advantages of SDN...
There *has* to be a control plane. With SDN, it doesn't have to be in the switch, it can be in the controller. If you want to interface with "standard" switches and routers at the edges of your OpenFlow network, the controller is going to have to receive and send standard L2 and L3 topology discovery messages, and they probably want to ingress and egress from the switch ports. If you have an OpenFlow "walled garden", then no, the controller doesnt have to interface with traditional switches and routers, and you can do whatever you like in the controller to build L2 and L3 forwarding behavior. Regards, Dave David B. Nelson Director of Technology Elbrys Networks, Inc. www.elbrys.com +1.603.570.2636
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