To be agile and cost effective, data centers must allow dynamic resource allocation across large server pools. Our VL2 prototype shuffles 2.7 TB of data among 75 servers in 395 seconds - sustaining a rate that is 94% of the maximum possible. We evaluate the merits of the VL2 design using measurement, analysis, and experiments. As a result, VL2 networks can be deployed today, and we have built a working prototype. VL2's implementation leverages proven network technologies, already available at low cost in high-speed hardware implementations, to build a scalable and reliable network architecture. VL2's design is driven by detailed measurements of traffic and fault data from a large operational cloud service provider. VL2 uses (1) flat addressing to allow service instances to be placed anywhere in the network, (2) Valiant Load Balancing to spread traffic uniformly across network paths, and (3) end-system based address resolution to scale to large server pools, without introducing complexity to the network control plane. To meet these goals, we present VL2, a practical network architecture that scales to support huge data centers with uniform high capacity between servers, performance isolation between services, and Ethernet layer-2 semantics. In particular, the data center network should enable any server to be assigned to any service. To be agile and cost effective, data centers should allow dynamic resource allocation across large server pools. Anyway it was useful to observe how these tools behave in a virtualized environment like Mininet. In fact Argus and Ntop (ntopng as well) cannot recognize the packets relative to OpenFlow, so they are still not able to recognize the commmunications between Controller and Switch. Using the above mentioned tools, I noticed that only Wireshark is able to recognize OpenFlow protocol. Mininet is a network emulator, which runs end-hosts, switches, routers, and links on a single Linux kernel, while OpenDaylight is a Controller that uses the OpenFlow protocol, and belongs to the OpenDaylight project. With Mininet and the OpenDaylight Controller. In order to evaluate the functioning of the above mentioned tool, I deployed a testbed environment Ntop (and its evolution: Ntopng), Wireshark and Argus. In this thesis I used some tools in order to see how they can be adapted to SDN. Is the first standard interface designed specifically for SDN. The SDN model is based on “open interfaces”.The Controller uses open protocols being OpenFlow Plane is represented by the switches.The central controller keeps information about the state of all The control-plane is represented through a central Controller, while the data. Main transformation of the architecture is represented by the separation between the control-planeĪnd the data-plane. However, a new network paradigm has emerged, called Software Defined Networking (SDN).The For years, different well-known tools have been employed for network monitoring. Network monitoring can be achieved using various software or a combination of plug-and-play hardware and software appliance solutions. Network monitoring is a system that constantly monitors a computer network, to check if it is running properly during ordinary operations it can also optimize data flow and access in a complex environment and check the network availability all around the world.
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