Netgear WC7600 User Manual download pdf (Page 242)

Manage Stacking and Redundancy

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ProSAFE Wireless Controller WC7600

When the primary controller that went down and for which the redundant controller took over

comes back up and is stable, a switchback occurs automatically, in which case ownership of

the controller IP address is returned to the primary controller that came back up. The

redundant controller reassumes its passive position, and redundancy is once again available

for all primary controllers in the redundancy group.

Note: When a redundancy failover occurs, wireless clients might experience

a service interruption of a few seconds.

Requirements and Restrictions for N:1 Redundancy

These are the requirements and restrictions for N:1 redundancy to function correctly:

• All controllers in a redundancy group must be in the same management VLAN and IP

subnet.

• The primary controllers must be stacked.

• If three or four controllers are in the same redundancy group, you must configure one

controller as the redundant controller and all other controllers as primary controllers.

• All controllers in the redundancy group 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 that

has the largest number of licenses. For example, in a redundancy group with two primary

controllers, if one primary controller has a license for 10 access points and the other

primary controller has a license for 50 access point, the redundant controller must have a

license for 50 access points. If the licenses do not match, redundancy does not work.

• For the relationship of each primary controller with the redundant controller, you must

configure a unique VRRP ID, also in relation to any other VRRP IDs that might be used

for other purposes in the network. You also must configure a unique local controller IP

address for each controller in the redundancy group.

• When a failover occurs and the redundant controller takes over for a primary controller,

redundancy is no longer available for the other primary controllers in the redundancy

group.

Example of an N:1 Redundancy Configuration

The following figure shows an N:1 configuration with three stacked controllers and one

redundant controller before a failover has occurred.

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Netgear WC7600 User Manual Page 242