The high availability feature supports redundancy models with an active switch pair, or an active/standby
deployment model with one backup switch supporting one or more active switches. Each of these clusters of
active and backup switches comprises a high-availability group. All active and standby switches within a single
high-availability group must be deployed in master-local or independent masters topologies. An independent
masters topology requires all independent master switches to have the same WLAN configuration.
Pre-Deployment Information
Refer to the following sections of this document for deployment models and feature details to help you plan
your high availability solution:
n High Availability Deployment Models on page 634
n High Availability Extended Switch Capacity on page 637
n Client State Synchronization on page 636
n High Availability Inter-Switch Heartbeats on page 637
Configuring High Availability
Configure the high availability feature in the WebUI or CLI using the high-availability and high-availability group
profiles.
In the WebUI
To configure High Availability using the WebUI:
1. Navigate to Configuration > Advanced Services > Redundancy.
2. In the HA Group Configuration section, click Add New. A pop-up window appears.
3. In the Name field, enter a name for the HA group you just created.
4. In the switch IPaddress field, enter the IP address of a switch 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 switch.
6. Click the Role drop-down list to assign a role to the switch. The IP address of each switch must be reachable
by APs and must be the IP address that appears in the Configuration > Switch > System settings tab of
the switch WebUI, or in the output of the show switch-ip CLI command.
n Active: Switch is active and serving APs.
n Dual: Switch serves some APs and acts as a standby switch for other APs.
n Standby: Switch does not serve APs and only acts as a standby in case of failover.
7. Click Add to add the switch to the group.
8. (Optional) The high availability inter-switch heartbeat feature allows for faster AP failover from an active
switch to a standby switch, especially in situations where the active switch 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 switch. This value must be between
3 and 10, inclusive.
b. Enter a heartbeat interval in the Heartbeat Interval field to define how often inter-switch 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 switch to the standby switch. To use the state synchronization feature,
enter a pre-shared key into the Pre-shared key field. Note, however, that this feature is not enabled until
you complete the task in step 13 on page 640
AOS-W 6.5.3.x | User Guide Increasing Network Uptime Through Redundancy and VRRP | 639
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