目前可实现控制器虚拟化,通过以分布式方式运行控制器,智能AP可借助智能协调实现自管理。

WLAN控制器(机架安装设备或服务器)与瘦AP配套工作,瘦AP从WLAN控制器检索固件和配置:整个无线网络只有一个管理点。此外,它还充当交换机,并针对通过该控制器进行隧道传输的所有无线流量发挥防火墙的作用:所有无线流量有单一的控制和终止点。

如今,可以实现控制器虚拟化,借助智能协调功能在AP中以分布式方式部署和运行。智能和高级AP作为单个系统或集群管理,并以分布式和协调的方式来控制和转发平面。

统一管理和分布式控制解决方案使无线部署架构不再需要之前所需的控制器,能够为企业及其IT部门提供许多潜在优势。

优势

  • 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 controllers means less equipment to operate and manage providing several OPEX benefits: less rack space, less power and cooling requirements, no maintenance fees (especially for unused backup controllers), and, basically, 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: no controller equipement is needed, regardless of the size of the deployment.
  • Last but not least, the distributed control architecture is certainly the shortest route to the next breakthrough in enterprise wireless technology: cloud Wi-Fi.

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