What Is Software-Defined Networking
Software-Defined Networking (SDN) is the decoupling of the network control logic from the devices that perform the function, such as B. Routers that control the flow of information in the underlying network. This approach simplifies infrastructure management, which can be organization-specific. or partition to be shared by several.
SDN has drivers overlaid on cloud or local network hardware that provide policy-based management. Technically, the network control plane and the forwarding plane are separate from the data plane (or underlying infrastructure) so that the company can program network control directly, which is very different from traditional data center environments.
For instance, In a traditional environment, a router or switch, whether in the cloud or physically in the data center, only knows the status of neighboring network devices. With SDN, intelligence is centralized and productive. And helps to see and control everything.
Furthermore, this also helps in managing compliances that can help manage your virtual workforce.
The Components of Software-Defined Networks
- Software-Defined Networks (SDNs) consist of three main components, which may or may not reside in the same physical area:
- Applications that provide information about the network or requests about the availability or allocation of certain resources.
- SDN drivers that communicate with applications to determine the destination of data packets. The controllers are the load balancers within SDN.
- Network devices receive instructions from drivers to forward packets.
In addition to these components, OpenFlow is a programmable network protocol that routes traffic between network devices and is used in SDN. The Open Networking Foundation (ONF) helped standardize the OpenFlow protocol and other open-source SDN technologies. SDN ecosystems to ensure adequate network traffic flow.
The Importance of Virtualization in Software-Defined Networks
The term “virtual network” is sometimes misused as a synonym for the term SDN. These two concepts are quite different, but they work well together.
Network Functions Virtualization (NFV) segments one or more logical or virtual networks within a single physical network.NFV can also connect devices in different networks to create a single virtual network that often also contains virtual machines.
SDN enables network administrators to set policies from a central location to set network access controls and security measures based on the type of workload or network segments.
Additionally, you can also use micro-segmentation to decrease its complexity and provide consistency across any network architecture, whether it’s a public cloud, private cloud, hybrid cloud, or multi-cloud.
Furthermore, SDN makes it easier to write automated programs so that the company can configure, protect, and optimize resources as needed. Simplified network design and operation by using open drivers instead of proprietary devices and protocols.
The SDN technology combined with virtual machines and network virtualization also offers service providers efficiency. With these resources, you can provide the clients with different network separations and controls. In doing so, SDN is transforming the telecommunications industry.
Service providers can improve their flexibility and provide bandwidth on demand to customers who need more flexibility and who have variable bandwidth usage.
Different Types of SDNs
There are four main types of Software Defined Networks (SDNs), each with its own advantages:
- Open SDN uses open protocols to control the virtual and physical devices responsible for routing data packets.
- API-based SDN makes use of programming interfaces, often referred to as southbound APIs, to control the flow of data to and from each device.
- Overlay model SDN creates a virtual network on existing hardware and provides tunnels with channels to data centers. This model then allocates bandwidth to each channel and assigns devices to each channel.
- The Hybrid SDN model combines SDN and traditional networks so that the optimal protocol can be assigned for each type of traffic. Hybrid SDN is often used as a step-by-step approach to SDN.
The Risks of Software Defined Networks
As we’ve seen, SDN can benefit an organization in many ways, including greater agility and control, easier management and configuration, and increased security. The controller is critical to maintaining a secure network. it is centralized and therefore a single potential source of error. These potential issues can be handled by implementing controller redundancy in the network with automatic failover. This can be expensive, but it is no different from generating redundancy in other areas of the network to ensure a business continuum.
SD with WAN Combination for The Win
Service Providers and Organizations can benefit from a software-defined Wide Area Network or SDWAN. An SD-WAN is configured programmatically and provides a centralized management function for any cloud, local or hybrid network topology in a wide area network.
What about SDWAN is that it supports multiple types of connectivity including SDN, virtual private networks, MPLS, and others.
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