IT managers have been preoccupied with virtualising their corporate IT for many years. After the cloud, workplaces and telephony, they are now focusing on their networks. This specialist article describes how IT decision-makers should go about it using SDN-based network architectures.
First published on 25 january 2019, updated
Data, storage space, and apps, etc. are already in the cloud. They can be accessed on smartphones, tablets or notebooks as well as business applications like payment systems and M2M applications. As you know, IT already offers these possibilities.
However, you also know that the more you have connected to your network, the greater the demand for performance, stability and scalability. What you therefore need is a network that is highly elastic so that it can react flexibly and in an agile manner to changing business requirements.
SDN-based network architectures meet all these requirements in full. They do so by replacing many network components with central software applications and a handful of standardised hardware components. Rather than lots of proprietary and dedicated hardware, as many functions as possible are virtualised and realised as software. This enables you to respond quickly and easily to change.
Central and transparent end-to-end management helps execute customer wishes across network or national boundaries. SDN solutions like Enterprise Connect from Swisscom offer the necessary platform. Three goals are primary in this respect:
Virtualising network resources enables rapid adaptation to changing business conditions, applications or momentary data traffic volumes. This is made possible because the control layer is kept separate from the infrastructure (data) layer. Network-wide monitoring and control functions are bundled within the SDN controller. With the aid of software, this creates a programmable infrastructure that is more independent of the physical devices.
SDN controllers use open standards and APIs, thus enabling the orchestration, control and management of network devices from different manufacturers. This takes place at the application layer, which offers individual perspectives of the infrastructure. Based on open platforms, the application layer capitalises on the scalability, performance and availability of modern cloud computing and storage resources.
As a result, new services or locations can be ordered from Swisscom via order management within minutes rather than weeks or even months.
SDNs and SD-WANs are closely related to network function virtualisation (NFV). Application-based network functions, such as routers, firewalls and load balancers, are virtualised. Thanks to NFV, all monitoring and controlling functions can be handled by the SDN controller in the control layer.
Up to now, network and service management tended to be rather complex and difficult. Central SDN controllers avoid network complexity and combine the local network elements. This is achieved by separation into three layers:
This increases the flexibility and agility of the individual layers as well as the scalability of the entire system.
An example: Up to now, you have deployed specialised and proprietary hardware like switches and firewalls. But you don’t need them anymore. Instead, you can use cheaper universal hardware and assign it the relevant required role using software. As such, a hardware element can be used as a load balancer one day and as a firewall the next day – provided that it has been supplied with the necessary software function from the cloud.
The separation of network functions into manageable units and the division into three clearly defined layers also has a positive impact on security. After all, businesses using SDN can cut their operational expenditure because simpler programmability means that network functions can be automated more easily.
In future, the flexible opportunities offered by SDNs will not be restricted by national boundaries. Interconnecting the SDN controllers of different network operators offers a seamless solution for international customers. If you woud like further information, we recommend our white paper “With SD-WANs into the Hybrid Cloud”.
A unique complete package based on software-defined networking for the optimum interaction of your ICT. Use all the advantages of digitalisation, and start by making your network more intelligent, faster, and more agile.
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