
Managing Stacking and Redundancy
159
ProSafe 20-AP Wireless Controller WC7520
Requirements and Restrictions for a Single Controller with Redundancy
These are the requirements and restrictions for a single controller with redundancy to
function correctly:
• The p
rimary controller and redundant controller need to be in the same management
VLAN and IP subnet.
• Th
e 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.
• T
he primary controller and redundant controller need to run the same firmware version. If
the firmware versions do not match, redundancy does not work.
• The licen
ses on the redundant controller need to match those on the primary controller. If
the licenses do not match, redundancy does not work.
• The p
rimary 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 87.
The following figure shows the settings on the Stacking/Redundancy screen before a failover
has occurred.
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