![]() Each plane is found within the confines of the switch. The difference is that in a physical switch, all three live under the same roof. ![]() ![]() The management plane is for configuration, the control plane is where the learning takes place, and the data plane is responsible for forwarding the traffic. With NSX, we have the same planes and they have the same functions. The thinking part has already been accomplished by the control plane and the decisions it made are recorded in the MAC table and STP topology. But the data plane doesn't have to think it just does the work. It switches frames from the input interface to an output interface (which is why it's called a switch). However, it's the data plane that does the real work in moving the frames. Now the switch knows exactly where to forward the traffic. The end result of all this learning is a MAC table of learned hosts and ports and a loop free topology. The switch learns the topology, figures out which ports should be forwarding and which should be blocking. If the primary path fails, the corresponding blocked port transitions to forwarding. STP's job is to identify physical loops and block specific interfaces that ultimately eliminate all loops, giving a single path from one point to any other point within the Layer 2 domain. Another example of learning in the control plane is Spanning Tree Protocol. That information is then recorded in the MAC table. It learns the MAC addresses and the location of the devices, reading the Ethernet headers to find the source MAC and making note of which interface the frame arrived on. You can think of the control plane as the brains of the operation. The learning occurs in the control plane. The switch will dynamically learn the MAC addresses assigned to the hosts within that domain.
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