SDN Is the Future, Plan Your Migration Now

Unless you're a very small business with a unproblematic network and zilch in the cloud, you're probably already using software-divers networking (SDN) fifty-fifty if you don't know it. That'southward because whenever you sign up for a virtual server from a deject-based Infrastructure-equally-a-Service (IaaS) player, y'all're actually taking advantage of software-divers technology. When you sign on to Amazon Spider web Services (AWS), Google Cloud, or any of the other public deject services, those virtualized instances are communicating with you lot and the rest of the world past using a software-defined network.

IT Watch bug art But that may non be the case in your own information heart. Co-ordinate to some estimates, but about a quarter of on-bounds networks are using software-divers anything and even there virtually of that usage is only on a partail or siloed basis. The reasons are many merely generally they boil downwardly to 1 give-and-take: inertia. But there'south another discussion that follows closely: fear.

What Is Software-Defined Networking?

The traditional network that's currently in your information heart and elsewhere in your company consists of switches, routers, and other network devices, each with its own divers purpose. These devices contain their own management software, often proprietary operating systems (OSes), and, while they may be managed as a group using network management software, they're still independent devices subject to individual configuration issues, so they need a troubleshooting schema that tin get very complicated very quickly.

SDN puts the management of each of these devices into a defended layer that has an end-to-end view of the network, and even beyond the network if yous're employing hybrid or service-reliant architectures. This layer also works on a functional level, so a software-defined router, for example, volition route every packet from source to destination, choosing the best path for each. The resulting unmarried-layer optimization means that what used to be hard multi-layer tasks, such as optimizing traffic planning, is now much easier because not only are the traffic and direction tools at the software layer simply the infrastructure is, also.

But you lot say that the network in your organization already works so why change it? "The old-fashioned mode of using specific hardware locked you into a specific way of networking," explains Jack Gold, Principal Analyst at J. Aureate Assembly.

"SDN has a number of advantages," Aureate said. "You lot can alter network topology, identity, and firewalls, and put in antivirus or network monitoring in software." And because it's all in software, It administrators proceeds not only the ability to rapidly spin upwards virtual infrastructure, they can also store the templates for that infrastructure for even faster use in the hereafter.

The power to alter how your network is organized to meet your specific requirements is a huge plus, Gilded said. Because it'due south done in software, it means that you can brand changes whenever yous need to, without having to switch out network hardware or appliances. Decide you don't like your network monitoring system? You can change it. Want a different anti-malware or security monitoring adequacy? You tin can change that, too.

Software-Defined Price Savings

One additional advantage SDN volition deliver over the long term is cost savings. And for even midsize businesses, that can often add up to a lot of money. Gold said that, while there volition be some upfront costs equally you lot replace your existing infrastructure with hardware that is programmable, it will be cheaper over the long run.

"SDN should be easier to deploy from a resource perspective," Gold said, "because you don't demand to observe and hire an engineer with specialized hardware experience on your gear." Instead, y'all demand a software engineer who can manage the hypervisor layer and the virtual infrastructure management tool, both of which are often based on Linux. In add-on, the generic software-divers switches and other networking appliances are less expensive because they don't require proprietary licenses and support agreements. In the hands of experts, they're often safer, too, because such folks can literally build fully customized or app-optimized routers and switches from generic templates.

Plan Carefully

However, hype bated, SDN represents a paradigm shift in both network management and operations and any change like that requires careful planning. Gold provides four suggestions:

"The beginning thing to do is call back nearly what yous desire your network topology to be over the next couple of years. What features and functions practice you think you'll need?"

"Do yous desire to go it in-house? Do yous want it equally a service?" Y'all can now get your networking as a service from a variety of vendors ranging from Cisco to HPE.

"Check out what other people in your industry are doing. Check what they're changing or not changing."

After that, Gold suggests you talk to a consultant, or if you have a dedicated shop, such every bit one in which your equipment is strictly from Cisco, then talk to Cisco, or any company provides your infrastructure. Well-nigh of them have made investments in SDN, so it'south smart to wait in that location early.

Gold said that the same calculations yous used for deciding on a deject service also utilise to SDN. The lesser line is, which is cheaper: the monthly toll for networking every bit a service versus paying someone to manage your network, along with buying the infrastructure?

It's also important to know that y'all don't have to simply shut your performance downward to make the switch. You can migrate your network in stages, bringing a software-divers network to those areas that demand it the most, such as video, business-class vocalization over IP (VoIP), or to your virtualized servers in the data center, so expand it to other parts of your legacy network over fourth dimension.

This trend to software-divers networks is simply starting. "Don't exist alarmed if you think you might be behind the times," Gilt said, "Yous're non alone."