Netgear WC9500 Reference Manual - Page 278

ProSAFE Wireless Controller WC9500 Manage Redundancy for a Single Controller The wireless controller supports 1:1 redundancy with failover. Redundancy is implemented through the use of the Virtual Router Redundancy Protocol (VRRP). For information about N:1 redundancy, see Manage a Redundancy Group with N:1 Redundancy on page 282. VRRP Redundancy Concepts You can configure two controllers to form a redundancy group. You then designate one controller in the redundancy group as the primary controller and the other wireless controller as the redundant controller. If the primary controller fails or is disconnected from the network, an automatic failover to the redundant controller occurs. The redundant controller then takes over all functions of the primary controller. Note: When a redundancy failover occurs, wireless clients might experience a service interruption of a few seconds. Requirements and Restrictions for Redundancy These are the requirements and restrictions for a single controller with redundancy to function correctly: • The primary controller and redundant controller must be in the same management VLAN and IP subnet. • The VRRP ID for the relationship between the primary controller and redundant controller must be unique and also different from any other VRRP IDs that might be used for other purposes in the network. • The primary controller and redundant controller must run the same firmware version. If the firmware versions do not match, redundancy does not work. • The licenses on the redundant controller must match those on the primary controller. If the licenses do not match, redundancy does not work. • The primary controller and redundant controller must be assigned the same controller IP address at which they provide the service, but each controller is assigned its own unique local IP address. Manage Stacking and Redundancy 278