Administrator Guide

674 | Increasing Network Uptime Through Redundancy and VRRP Dell Networking W-Series ArubaOS 6.4.x| User Guide
(host)(config) #ap-name <name>
ap-system-profile <profile>
Configuring the Master Controller for Redundancy
The master controller in the Dell user-centric network acts as a single point of configuration for global policies
such as firewall policies, authentication parameters, and RF configuration to ease the configuration and
maintenance of a wireless network. It also maintains a database related to the wireless network that you can
use to make adjustments (automated or manual) in reaction to events that cause a change in the environment
(such as an AP becoming unavailable).
The master controller is also responsible for providing the configuration for any AP to complete its boot
process. If the master controller becomes unavailable, the network continues to run without any interruption.
However, any change in the network topology or configuration will require the availability of the master
controller.
To maintain a highly redundant network, the administrator can use a controller to act as a hot standby for the
master controller. The underlying protocol used is the same as in local redundancy, that is, VRRP.
Collect the following data before configuring master controller redundancy:
l VLAN ID for the two controllers on the same Layer-2 network.
l Virtual IP address that has been reserved to be used for the VRRP instance.
You can use either the WebUI or CLI to configure VRRP on the master controllers (see Table 130). For this
topology, the following values are recommended:
l For priority: Set the master to 110; set the backup to 100 (the default value)
l Enable preemption
l Configure master up time or master state tracking with an add value of 20.
The following is a configuration example for the initially-preferred master.
(host)(config) #vrrp 22
vlan 22
ip address 10.200.22.254
priority 110
preempt
authentication password
description Preferred-Master
tracking master-up-time 30 add 20
no shutdown
The following configuration is the corresponding VRRP configuration for the peer controller.
(host)(config) #vrrp 22
vlan 22
ip address 10.200.22.254
priority 100
preempt
authentication password
description Backup-Master
tracking master-up-time 30 add 20
no shutdown
Use the following commands to associate the VRRP instance with master controller redundancy: