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480 | VRRP DellPowerConnectW-SeriesArubaOS6.2 | User Guide
(automated as well as 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.
l Collect the following data before configuring master controller redundancy.
l VLAN ID on the two Dell controllers that are on the same layer 2 network and will be used to configure
VRRP.
l Virtual IP address that has been reserved to be used for the VRRP instance
l You can use either the WebUI or CLI to configure VRRP on the master Dell controllers (see Table 140). For
this topology, the following are recommended values:
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.
Command Explanation
master-redundancy
Enter the master-redundancy context.
master-vrrp <id>
Associates a VRRP instance with master redundancy. Enter the virtual
router ID of the VRRP instance.
peer-ip-address <ipaddr> ipsec
<key>
Loopback IP address of the peer controller for master redundancy.
The pre-shared key secures communication between the master Dell
controllers. Specify a key of up to 64 characters.
Table 141:
VRRP Commands