The Software-Defined Networking Controller in Data Centers
In a virtualized data center, SDN network controllers play an important role. The short version of what SDN controllers do, especially in a spine-leaf architecture, is to disseminate policies to switches. Datacenter switches use policies to determine how they direct traffic between servers and to the outside world.
The east-west and north-south directions of traffic are respectively called east-west and north-south. The majority of traffic in modern data centers (server to server traffic) is east-west traffic.
Organizations can spend less on switches when using an SDN controller. With SDN network controllers, organizations can instead use switches that do not have expensive chipsets to intelligently route data. Without those chipsets, switches have less computational power but do not require as much computing power to function due to policies provided by the controller.
Load-balancing mechanisms can help avoid this by redirecting traffic overloading controllers to other network controllers.
Network virtualization in data centers
Traditionally hardware-based functions are turned into software programs and then installed onto a device through virtualization. In a virtualized environment, the hardware is responsible for providing the resources that the network function software needs to operate.
In data center networking, virtualization also involves separating the network control plane from the forwarding plane. An SDN controller resides in the control plane. The network controller communicates the needs of the applications in the data center to the network devices used in the forwarding plane. Communication between the two planes includes the network controller deciding what devices have the resources to accommodate the application traffic’s needs and thus where to send the traffic initially.
Eventually, administrators may need to change the network’s policies for reasons of security, efficiency, or scaling. Administrators can make adjustments with unified management software, which provides network visibility and enables them to easily push updates and reconfigure infrastructure without physically interacting with devices.
With centralized management software, administrators can spin up more virtual machines in networking devices to handle the increased traffic generated by growing workloads.
Additionally, network virtualization means more efficient use of resources. As a result of this dynamic, virtualized data centers could get by with fewer networking devices. If the data center retains its networking devices, it can handle more traffic and increase its capacity. By not purchasing as many networking devices and not wasting money on idle resources, an organization can reduce costs.
A virtual data center can aggregate the resources available on switches, routers, network links, and even network interface cards (NICs). By pooling resources like this, the network runs more efficiently because all of the network devices’ resources are accessible to all of the data center’s workloads, meaning resources are less likely to be idle.
In the network links, there is also aggregation and partitioning. Through network virtualization, it is possible to combine the connection mediums to increase bandwidth when needed when aggregating links. Link partitioning, on the other hand, isolates traffic from different sources or types of traffic. In addition to improving security, traffic isolation also helps in prioritizing traffic.
Automation in Network Virtualization
We help your company virtualize your networks through our Managed Datacenter Automation & Network Virtualization Services. Additionally to automating day-to-day management and monitoring, some companies are automating the entire workflow process for dynamic placement of workloads through end-to-end network virtualization.