634| Increasing Network Uptime Through Redundancy and VRRP AOS-W 6.5.3.x| User Guide
When the master switch becomes unavailable, a backup switch steps in as the master and takes ownership of
the virtual IP address. All network elements (APs and other switches) can be configured to access the virtual IP
address, thereby providing a transparent redundant solution to your network.
VRRP eliminates a single point of failure by providing a mechanism to elect a VRRP "master" switch. If VRRP
preemption is disabled (the default setting) and all switches share the same priority, the first switch that comes
up becomes the master. However, if VRRP preemption is enabled and all switches share the same priority, the
switch with the highest IP address becomes the master.
For more information on configuring the VRRP-Based Redundancy, refer to Configuring VRRP Redundancy on
page 643.
High Availability Deployment Models
High availability supports the following deployment modes:
n Active/Active Deployment Model on page 634
n 1:1 Active/Standby Deployment Model on page 634
n N:1 Active/Standby Deployment Model
n Master-Redundancy Deployment Model
The High Availability Fast Failover feature supports APs in campus mode using tunnel, decrypt-tunnel, or bridge
forwarding modes. This feature is not supported on remote APs or mesh APs in any mode.
Active/Active Deployment Model
In this model, two switches are deployed in dual mode. Switch 1 acts as a standby for the APs served by switch
2, and vice-versa. Each switch in this deployment model supports approximately 50% of its total AP capacity; if
one switch fails, all the APs served by that switch failover to the other switch, providing high availability
redundancy to all APs in the cluster.
Figure 79 Active-Active HA Deployment
1:1 Active/Standby Deployment Model
In this model, the active switch supports up to 100% of its rated capacity of APs, while the other switch is idle in
standby mode. If the active switch fails, all APs served by the active switch failover to the standby switch.
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