NETGEAR ProSafe WC7520 Reference Manual page 148

• The VRRP ID for the relationship between the primary controller and redundant controller
needs to be unique, also in relation to any other VRRP IDs that might be used for other
purposes in the network.
• The primary controller and redundant controller need to run the same firmware version. If
the firmware versions do not match, redundancy does not work.
• The licenses on the redundant controller need to match those on the primary controller. If
the licenses do not match, redundancy does not work.
• The primary controller and redundant controller need to have the same controller IP
address at which they provide the service, but each controller has its own unique local IP
address.
Example of a Configuration with a Single Controller with Redundancy
The following figure shows a configuration with a primary controller and a redundant
controller before a failover has occurred.
Figure 84.
The following figure shows the settings on the Stacking/Redundancy screen before a failover
has occurred.
ProSafe 20-AP Wireless Controller WC7520
Managing Stacking and Redundancy
148