Dell W-Series 277 Instant 6.4.3.1-4.2 User Guide - Page 93
In the Instant UI, In the CLI, Master Election and Virtual Controller, Master Election Protocol
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In the Instant UI To change the USB port status: 1. From the Access Points tab, click the W-IAP to modify. The edit link is displayed. 2. Click the edit link. The edit window for modifying W-IAP details is displayed. 3. Click the Uplink tab. 4. Set the port status by selecting any of the following options: l Disabled-To disable the port status. l Enabled-To re-enable the port status. 5. Click OK. 6. Reboot the W-IAP. In the CLI To disable the USB port: (Instant AP)# usb-port-disable To re-enable the USB port: (Instant AP)# no usb-port-disable To view the USB port status: (Instant AP)# show ap-env Antenna Type:External usb-port-disable:1 Master Election and Virtual Controller Instant does not require an external mobility controller to regulate and manage the Wi-Fi network. Instead, one W-IAP in every network assumes the role of Virtual Controller. It coordinates, stores, and distributes the settings required to provide a centralized functionality to regulate and manage the Wi-Fi network. The Virtual Controller is the single point of configuration and firmware management. When configured, the Virtual Controller sets up and manages the VPN tunnel to a Mobility Controller in the data center. The Virtual Controller also functions like any other AP with full RF scalability. It also acts as a node, coordinating DHCP address allocation for network address translated clients ensuring mobility of the clients when they roam between different W-IAPs. Master Election Protocol The Master Election Protocol enables the Instant network to dynamically elect a W-IAP to take on a Virtual Controller role and allow graceful failover to a new Virtual Controller when the existing Virtual Controller is not available. This protocol ensures stability of the network during initial startup or when the Virtual Controller goes down by allowing only one W-IAP to self-elect as a Virtual Controller. Preference to a W-IAP with 3G/4G Card The Master Election Protocol prefers the W-IAP with a 3G/4G card, when electing a Virtual Controller for the Instant network during the initial setup. The Virtual Controller is selected based on the following criteria: l If there is more than one W-IAP with 3G/4G cards, one of these W-IAPs is dynamically elected as the Virtual Controller. l When a W-IAP without 3G/4G card is elected as the Virtual Controller but is up for less than 5 minutes, another W-IAP with 3G/4G card in the network is elected as the Virtual Controller to replace it and the previous Virtual Controller reboots. 93 | Customizing W-IAP Settings Dell Networking W-Series Instant 6.4.3.1-4.2.0.0 | User Guide
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