Il est aujourd'hui possible de virtualiser le contrôleur en l'exécutant de manière distribuée. Les points d'accès intelligents peuvent alors se gérer de façon coordonnée.

Avantages

  • Lower CAPEX: Controller-based architectures involve high upfront capital expenses. They also involve high licensing and maintenance costs. With a distributed control architecture, CAPEX is reduced as no controller is required.
  • Lower OPEX: No controller means less equipment to operate and manage. This provides several OPEX benefits including the need for less rack space, less power and cooling requirements, no maintenance fees (especially for unused backup controllers), and less equipment to be monitored by the IT department.
  • Increased resiliency: In a centralized controller-based architecture, the controller is a single point of failure for the entire wireless network impacting all wireless traffic when the controller fails. The only way to minimize the impact is to add additional redundant controllers, but this comes at a cost. With a distributed control architecture, that single point of failure does not exist. Indeed, the controller function is no longer centralized but shared by all APs in the domain of management.
  • No traffic bottleneck and decreased latency: The WLAN is expected today to connect bandwidth-hungry and/or latency sensitive applications. Over the years, the technology has improved to provide increasing levels of throughput with IEEE standards 802.11a/b/g/n and now 802.11ac. With the distributed control approach, the traffic is no longer tunneled to centralized equipment but directly bridged into the local Ethernet switch.
  • Better scalability: When the maximum number of APs that a controller can manage is reached, deploying additional APs requires an additional controller. The distributed control architecture offers much better scalability as no controller equipment is needed, regardless of the size of the deployment.
 

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