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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
Redundancy
on page 297.
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 (the master) and the other
wireless controller as the redundant controller (the secondary 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, WiFi clients might experience a
service interruption of a few seconds.
Requirements and Restrictions for 1:1 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.
ProSAFE Wireless Controller
Manage a Redundancy Group With N:1
Manage Stacking and Redundancy
291
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