Dell PowerConnect W-Series Instant Access Point 6.1.3.4-3.1.0.0 | User Guide Virtual Controller | 107Chapter 9Virtual ControllerDell Instant does not require an external controller to regulate and manage the Wi-Fi network. Any IAP in theDell Instant network dynamically takes up the role of a Virtual Controller (VC) without impacting the network. Itcoordinates, stores, and distributes all the settings required to provide a centralized functionality to regulate andmanage the Wi-Fi network. The Virtual Controller also functions like any other AP with full RF scalability. It alsoacts as a node, coordinating DHCP address allocation for network address translated clients ensuring mobility ofthe clients when they roam between different IAPs.Master Election ProtocolThe Master Election Protocol enables the Dell Instant network to dynamically elect an IAP to take on a VC role,allow graceful failover to a new Virtual Controller when the existing VC is down, and avoid race conditions. Thisprotocol ensures stability of the network during initial startup or when the VC goes down by allowing only oneIAP to self-elect as a VC.Virtual Controller IP AddressYou can specify a single static IP address that can be used to manage a multi-AP Dell Instant network. This IPaddress is automatically provisioned on a shadow interface on the IAP that takes the role of a Virtual Controller.When an IAP becomes a Virtual Controller, it sends three Address Resolution Protocol (ARP) messages with thestatic IP address and its own MAC address to update the network ARP cache.Specifying Name and IP Address for the Virtual ControllerTo specify name and IP address for the Virtual Controller:1. At the top right corner of WebUI, click the Settings link. The Settings window appears.Figure 95 Specifying Virtual Controller Name and IP Address2. Enter a name for the Virtual Controller in the Name text box.
