SDN vs Traditional Networks Traditional networks were designed to forward packets from source to destination using the shortest route possible. Routers and switches were mostly agnostic to the applications being served by the network. Software-defined network (SDN) architecture allows service providers to build networks with increased application awareness, which can be built into the network by developing SDN controller applications that keep track of application-level characteristics and use that intelligence to provision flow into the network switches.Application awareness is the result of gained intelligence about Layer 4 to Layer 7 protocol attributes and delivery requirements. Software-defined network (SDN) architecture allows service providers to build networks with increased application awareness, which can be built into the network by developing SDN controller applications that keep track of application-level characteristics and use that intelligence to provision flow into the network switches. Methodology When the client transmits an IP packet, the switch inspects the packet and depending on the policy/rule installed in it, forwards the packet on a particular route. If the switch doesn’t have any policy/rule installed, it sends the packet to the controller. The controller inspects the packet header and/or the payload, determines the type of packet (TCP, UDP, HTTP, etc.), and installs a policy/rule on the switch instructing it to forward packets along a particular route. Our Implementation We have created different paths for TCP, UDP and ICMP traffic. We have further classified TCP traffic in to HTTP and FTP traffic. For each different type of traffic, we have assigned a dedicated path.Our implementation could easily be extended to be adaptive, so that the features of an application-aware network mentioned above could be realized.

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