Users Guide

668 | Increasing Network Uptime Through Redundancy and VRRP Dell Networking W-Series ArubaOS 6.4.x| User Guide
4. In the controller IPaddress field, enter the IP address of a controller in the HA group.
5. Click the IP Version drop-down list and select either IPv4 or IPv6 to identify the IP address version type used
by the controller.
6. Click the Role drop-down list to assign a role to the controller. The IP address of each controller must be
reachable by APs and must be the IP address that appears in the Configuration > Controller > System
settings tab of the controller WebUI, or in the output of the show controller-ip CLI command.
l Active: Controller is active and serving APs.
l Dual: Controller serves some APs and acts as a standby controller for other APs.
l Standby: Controller does not serve APs and only acts as a standby in case of failover.
7. Click Add to add the controller to the group.
8. (Optional) The high availability inter-controller heartbeat feature allows for faster AP failover from an active
controller to a standby controller, especially in situations where the active controller reboots or loses
connectivity to the network. To edit the default heartbeat threshold and interval values:
a. Enter a heartbeat threshold in the Heartbeat Threshold field to define the number of heartbeats that
must be missed before the APs are forced to failover to the standby controller. This value must be
between 3 and 10, inclusive.
b. Enter a heartbeat interval in the Heartbeat Interval field to define how often inter-controller
heartbeats are sent. This value must be between 100 and 1000 ms, inclusive.
9. (Optional) State synchronization improves failover performance by synchronizing client authentication
state information from the active controller to the standby controller. To use the state synchronization
feature, enter a pre-shared key into the Pre-shared key field. Note, however, that this feature will not be
enabled until you complete the task in step 13 on page 668
10.Click OK. The popup window closes, and the name of the new HA group appears in the HA Group
Configuration field on the Configuration > Advanced Services > Redundancy page.
11.(Optional)Select the Preemption checkbox to require APs that has failed over to a standby to attempt to
connect back to its original active controller once the controller is reachable again. When you enable this
setting, the AP will wait for the time specified by the lms-hold-down-period parameter in the ap system
profile before the AP attempts to switch back from the standby controller to the orginal controller.
12.(Optional) The standby controller over-subscription feature allows a standby controller to support
connections to standby APs beyond the controller's original rated AP capacity. To enable this feature, click
the Oversubscription checkbox.
13.(Optional) if you defined a pre-shared key in step 9 on page 668, select the State Synchronization
checkbox to enable this feature. (For more information about State Synchronization, see Client State
Synchronization on page 664)
14.(Optional) The inter-controller heartbeat feature allows for faster AP failover from an active controller to a
standby controller by enabling regular heartbeats between a standby controller and an active controller
15.Click Apply.
In the CLI
To configure a High Availability group using the command-line interface, access the CLI in config mode and
issue the following commands. The high availability group profile should be configured with a pair of IPv4
controller addresses and pair of IPv6 controller addresses to allow an IPv4 or IPv6 access point to establish a
connection to a standby controller.
ha group-profile <profile>
clone <profile-name>
controller <ipv4-ip-addr> role active|dual|standby
controller-v6 <ipv6-ip-addr> role active|dual|standby
heartbeat
heartbeat-interval <heartbeat-interval>