Controller Cluster Configuration Overrides (Controllers and Service Platforms Only)

A redundancy group (cluster) is a group of interactive access points, controllers or service platforms uniquely defined by the profile they share for their unique device type. Within the cluster, members discover and establish connections to other members and provide wireless self-healing support in the event of cluster member failure.

A cluster's AP load balance is typically distributed evenly amongst cluster members. Define how often this profile is load balanced for AP radio distribution as often as you feel required, as radios can come and go and members can join and exit the cluster.

As cluster memberships increase or decrease and their load requirements change, and a profile may need an override applied to best suit a site's cluster load requirements.

Note

There is a minmum limit of 2 devices that can be configured as cluster members.

To apply an override (if required) to a profile's cluster configuration:

1. Select the Configuration tab from the Web UI.

2. Select Devices from the Configuration tab.

   The Device Configuration screen displays a list of devices or peer access points, controllers or service platforms.

3. Select a target device (by double-clicking it) from amongst those displayed within the Device Configuration screen.

   Devices can also be selected directly from the Device Browser in the lower, left-hand, side of the UI.

4. Select Profile Overrides from the Device menu to expand it into sub menu options.

5. Select Cluster.

   

   Note

   A blue override icon (to the left of a parameter) defines the parameter as having an override applied. To remove an override go to the Basic Configuration section of the device and click the Clear Overrides button. This removes all overrides from the device.

   

6. Optionally define the following Cluster Settings and overrides:

   Cluster Mode	A member can be in either an Active or Standby mode. All active members can adopt access point radios. Standby members only adopt access points when an active member has failed or sees an access point not adopted. The default cluster mode is Active and enabled for use with the profile.
   Cluster Name	Define a name for the cluster name unique to its configuration or profile support requirements. The name cannot exceed 64 characters.
   Master Priority	Set a priority value from 1 and 255 with the higher value being given higher priority. This configuration is the device's priority to become cluster master. In cluster environment one device from cluster members is elected as cluster master. This configuration is the device's priority to become cluster master. The default value is 128.
   Handle STP Convergence	Select the radio button to enable Spanning Tree Protocol (STP) convergence for the controller. In general, this protocol is enabled in layer 2 networks to prevent network looping. Spanning Tree is a network layer protocol that ensures a loop-free topology in a mesh network of inter-connected layer 2 devices. The spanning tree protocol disables redundant connections and uses the least costly path to maintain a connection between any two devices in the network. If enabled, the network forwards data only after STP convergence. Enabling STP convergence delays the redundancy state machine execution until the STP convergence is completed (the standard protocol value for STP convergence is 50 seconds). Delaying the state machine is important to load balance APs at startup. The default setting is disabled.
   Force Configured State	Select the radio button to allow this Access Point, controller or service platform to take over for an active member if it were to fail. A standby cluster member takes the AP adopted by the failed member. If the failed cluster member were to come back up, the active member starts a timer based on the Auto Revert Delay interval. At the expiration of the Auto Revert Delay, the standby device releases all adopted APs and goes back to a monitoring mode. The Auto Revert Delay timer is stopped and restarted if the active member goes down and comes up during the Auto Revert Delay interval. The default value is disabled.
   Force Configured State Delay	Specify a delay interval in minutes (1 - 1,800). This is the interval a standby cluster member waits before releasing adopted APs and reverts to a monitoring mode once a cluster member becomes active again after a failure. The default interval is 5 minutes.

7. Within the Cluster Member field, select Cluster VLAN to enable a spinner control to designate the VLAN where cluster members are reachable. Specify a VLAN from 1 - 4094.

   Specify the IP addresses of the VLAN's cluster members using the IP Address table.

8. Select OK to save the changes and overrides made to the profile's cluster configuration. Select Reset to revert to the last saved configuration.