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Master Election and Virtual Controller

Instant does not require an external Mobility Controller to regulate and manage the Wi-FiWi-Fi is a technology that allows electronic devices to connect to a WLAN network, mainly using the 2.4 GHz and 5 GHz radio bands. Wi-Fi can apply to products that use any 802.11 standard. network. Instead, every Instant AP in the same broadcast domain automatically organizes together to create a virtual controller for the network. The virtual controller represents a single pane of glass that regulates and manages a Wi-FiWi-Fi is a technology that allows electronic devices to connect to a WLAN network, mainly using the 2.4 GHz and 5 GHz radio bands. Wi-Fi can apply to products that use any 802.11 standard. network at a single installation location, performing configuration and firmware management of all its member access points. The virtual controller architecture also ensures that a single AP sets up and manages the VPNVirtual Private Network. VPN enables secure access to a corporate network when located remotely. It enables a computer to send and receive data across shared or public networks as if it were directly connected to the private network, while benefiting from the functionality, security, and management policies of the private network. This is done by establishing a virtual point-to-point connection through the use of dedicated connections, encryption, or a combination of the two. tunnel to a mobility controller in the data center, if configured, and allows client traffic from all member APs to share the VPNVirtual Private Network. VPN enables secure access to a corporate network when located remotely. It enables a computer to send and receive data across shared or public networks as if it were directly connected to the private network, while benefiting from the functionality, security, and management policies of the private network. This is done by establishing a virtual point-to-point connection through the use of dedicated connections, encryption, or a combination of the two. tunnel.

The main capabilities supported by the virtual controller are listed below:

Master Election Protocol

The Master Election Protocol enables the Instant network to dynamically elect an Instant AP to take on a virtual controller role and allow graceful failover to a new virtual controller when the existing virtual controller is not available. The election beacons are broadcast and unicast L2 frames are used between the virtual controller and the slave Instant APs. This protocol ensures stability of the network during initial startup or when the virtual controller goes down by allowing only one Instant AP to self-elect as a virtual controller. When an existing virtual controller is down, a new virtual controller is elected by the master election protocol. This protocol is initiated by any non-virtual controller Instant AP that no longer receives beacon frames from an active virtual controller.

An Instant AP is elected as a master by one of the following methods:

  1. Enforced—In this method, Instant APs in preferred, 3GThird Generation of Wireless Mobile Telecommunications Technology. See W-CDMA./4GFourth Generation of Wireless Mobile Telecommunications Technology. See LTE. uplink, mesh portal, or stand-alone mode are elected as the master. However Instant APs in mesh point, or hierarchy down side mode are not elected as the master.
  2. Random Intervals—In this method, a quick Instant AP election takes place when the Instant APs boot. A re-election takes place when the existing master Instant AP is down. This results in random election of a master Instant AP.
  3. Versus Policy—This is a method by which multiple Instant APs in a cluster are competing with each other to become a master. The Instant AP with higher priority, higher uptime or a bigger MACMedia Access Control. A MAC address is a unique identifier assigned to network interfaces for communications on a network. address becomes the master. The Instant AP with lesser priority, lesser uptime or a smaller MACMedia Access Control. A MAC address is a unique identifier assigned to network interfaces for communications on a network. address becomes the slave.

Preference to an Instant AP with 3G/4G Card

The Master Election Protocol prefers the Instant AP with a 3GThird Generation of Wireless Mobile Telecommunications Technology. See W-CDMA./4GFourth Generation of Wireless Mobile Telecommunications Technology. See LTE. card when electing a virtual controller for the Instant network during the initial setup.

The virtual controller is selected based on the following criteria:

Preference to an Instant AP with Non-Default IP

The Master Election Protocol prefers an Instant AP with non-default IP when electing a virtual controller for the Instant network during initial startup. If there are more than one Instant APs with non-default IPs in the network, all Instant APs with default IP will automatically reboot and the DHCPDynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  process is used to assign new IP addresses.

Viewing Master Election Details

The following CLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions. command is used to verify the status of an Instant AP and master election details:

(Instant AP)# show election statistics

(Instant AP)# show summary support

Manual Provisioning of Master Instant AP

In most cases, the master election process automatically determines the best Instant AP that can perform the role of virtual controller, which will apply its image and configuration to all other Instant APs in the same Instant AP management VLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.. When the virtual controller goes down, a new virtual controller is elected.

Provisioning an Instant AP as a Master Instant AP

The following procedure describes how to provision an Instant AP as a master Instant AP:

Table 1: Steps to Provision an Instant AP as a Master AP

New WebUI

Old WebUI

To provision an Instant AP as a master Instant AP:

  1. Navigate to the Configuration > Access Points page.
  2. Select the Instant AP from the Access Points list and click Edit.
  3. Expand Uplink.
  4. Toggle the Preferred master switch to enable or disable the option.
  5. Click Save.

To provision an Instant AP as a master Instant AP:

  1. In the Access Points tab, select the Instant AP to modify and click edit.
  2. Select the General tab.
  3. In the Preferred master drop down list box, select Enabled. This option is disabled by default.
  4. Click OK.

The following CLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions. command provisions an Instant AP as a master Instant AP:

(Instant AP)# iap-master

The following CLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions. command is verifies if the Instant AP is provisioned as master Instant AP:

(Instant AP)# show ap-env

Antenna Type:Internal

Iap_master:1

Only one Instant AP in a cluster can be configured as the preferred master.

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