SD-WAN FOR COLLABORATION CLOUD DEPLOYMENTS

SDN: Present and Future

“All weak people tend to think that it would be great if no one controlled them; at the same time, they do not realize that they themselves cannot control themselves or others .. ” : SDN ideology allows us to simplify the network devices themselves to the limit (in fact, to support a control protocol for communication with the controller and basic switching functions), make them weak, and therefore cheap. This, ultimately, can drastically reduce OPEX, which prevents all holders of IT budgets from sleeping peacefully.“You need to go against the wind to unfurl the flag” : HP was a pioneer in the development of SDN technologies and one of the first to enter the market with a working solution (see below). When there was no OpenFlow yet and the network industry kept other technologies in focus, HP already participated in the development of the predecessor of OpenFlow (Ethane, in 2007), and then became one of the active participants in the OpenFlow Network Foundation (ONF) and, in 2011, InCENTRE (Center for testing OpenFlow).

To summarize: SDN is the ideology of building networks in which all the intelligence of the network is placed on a separate hardware / software base, and all traffic control is based on special protocols (for example, OpenFlow) that operate on the concept of “flow” and can perform various actions with it (allow, deny, redirect, rewrite fields in packages, etc.). In fact, the network policy is determined on the controller based on the specified rules, as well as the work of specialized applications (for example, emulating the operation of STP or routing protocols). Then the final result is transmitted to the switches using the OpenFlow protocol in the form of flow tables containing information about where, how and what traffic to transmit. On the one hand, this approach gives great flexibility in network management, on the other hand, it greatly simplifies administration (and,
A separate topic is building a network security system based on OpenFlow.  The controller actually centralizes this function too (in the form of a specialized application) and, Potentially, overtager all the intelligence of firewalls, IPSS and other traditional network protection systems. 

HP was one of the first two launch a commercial product att supports the OpenFlow protocol.  At the same time, HP switches att Support OpenFlow are hybrid, ie  support works simultaneously in two modes – OpenFlow plus traditional switching.  Consider a simple example where there are three HP 3800 series switches in a ring. Here’s how:  If controllers several options are collected – Floodlight, SNAC and NOX. In this example, two controllers are configured on the switches – SNAC and Floodlight, like this:

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SD-WAN FOR COLLABORATION CLOUD DEPLOYMENTS