Users Guide

618| Increasing Network Uptime Through Redundancy and VRRP Dell Networking W-Series ArubaOS 6.5.x| User Guide
VRRP eliminates a single point of failure by providing a mechanism to elect a VRRP "master" controller. If VRRP
preemption is disabled (the default setting) and all controllers share the same priority, the first controller that
comes up becomes the master. However, if VRRP preemption is enabled and all controllers share the same
priority, the controller with the highest IP address becomes the master.
For more information on configuring the VRRP-Based Redundancy, refer to
Configuring VRRP Redundancy on
page 626.
High Availability Deployment Models
High availability supports the following deployment modes:
l Active/Active Deployment Model on page 618
l 1:1 Active/Standby Deployment Model on page 618
l N:1 Active/Standby Deployment Model
l 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 controllers are deployed in dual mode. Controller 1 acts as a standby for the APs served by
controller 2, and vice-versa. Each controller in this deployment model supports approximately 50% of its total
AP capacity; if one controller fails, all the APs served by that controller failover to the other controller, providing
high availability redundancy to all APs in the cluster.
Figure 76 Active-Active HA Deployment
1:1 Active/Standby Deployment Model
In this model, the active controller supports up to 100% of its rated capacity of APs, while the other controller
is idle in standby mode. If the active controller fails, all APs served by the active controller failover to the
standby controller.