The network should respond to the needs of users and applications, but the network has not been well suited to our needs for a long time, and the network forces users and applications to adapt to network limitations. In the enterprise, IT departments have been working hard to align the security capabilities of the network with the development of devices and applications. In the WAN, bandwidth costs and limitations force users to accept lower network performance than LAN.
All of these conditions have changed with the rise of cloud computing, which provides users with the immediacy and responsiveness of a network that can be experienced on any device. To achieve this goal, cloud applications running in the data center require the data center's network to adapt and meet the huge demands of cloud computing for flexibility, scalability, and agility.
Software Defined Networking (SDN) was born in the data center and is a response to cloud computing running on software-defined virtual servers. Cloud computing is a new architecture that can meet the needs of users at any time. To match these transitions, data center networks must be equally flexible, agile, and scalable.
It must be automatic. With the user's demand for resources, cloud computing can create virtual machines in a very short time. The network must respond quickly and match, configure its own resources to handle the required routes to meet the connection needs. To ensure that all of this can be done without human intervention, the cloud and the network must be able to use the same technology.
The Network Team Awards see the status of virtual local area networks (VLANs), subnets, switches, and routers when IT can see users, applications, requirements, and so on. If the IT department wants to see policy, entitlement, and compliance issues, the network team maintains visibility into access control, firewall rules, service levels, and SLAs. The challenge for SDN is to use software to automate and abstract the network.
The result is dramatic, bringing a whole new network model. The SDN controller is directly bound to the workload's policies on the server software that instantiate the required network connections and policies. Compliance issues disappear and are easy to verify because they are included in the strategy. Moreover, the network structure or the underlying network is greatly simplified because the connection strategy is implemented in software. This allows the expansion of the network to keep up with the performance requirements of cloud computing. The abstraction provided by the SDN layer separates the network structure from the application strategy and enables them to scale more independently.
With the construction of cloud computing in the 5G network standard, and the rise of the Internet of Things and the popularity of the Internet, the cloud is developing outside the data center and gradually spreading to the edge of the WAN. Network features that previously run on dedicated hardware and applications are now distributed in the data center and edge clouds.
We need to automate connectivity and policies for these new workloads both within the data center and across the WAN. However, the WAN is an untamed beast. Since edge cloud workloads need to be bound to the underlying transport network, we can't simply extend the data center SDN to the WAN.
The WAN is a collection of established, complex global network infrastructures. Fiber, gateways, routers and switches, as well as operating system and business system layers, make WAN reliability as high as 99.999%, and the responsive and constructive interaction of IT applications and WANs that want to give flexible cloud times is a far greater aims.
Fortunately, WAN operators have begun to embrace some of the principles of SDN and virtualization as SDN and virtualization are more effective in building networks. But there is still a long way to go to implement a fully automated, software-defined, policy-driven network. Similar to data center SDN and WAN SDN software, cloud smoke is used to abstract complex network devices and topologies to automate device configuration. Optimize network resources.
There have been many attempts to use routers or switches with SDN and WAN SDN capabilities as converters or gateways, but they have spent a lot of effort on consolidation and eventually become vendor-specific solutions. They also tend to provide limited end-to-end network service visibility and rely on protocols such as RSVP, which are not designed to be fine-grained for network resource control.
What the industry needs is an open and scalable way to abstract multi-vendor WANs, providing fine-grained control of end-to-end network services, seamlessly connecting to data centers without the need for complex gateways.
There are already many innovative technologies that fill the gaps in some routes and open object models, and there is no lack of sustained investment. We have automated the data center LAN using the native language of the application workload, and now the WAN is more programmable.
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