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Campus Wireless Networks Validated Reference Design Version 3.3 | Design Guide Mobility Controller and Access Point Deployment | 25
Master Controller Redundancy
To achieve high availability of the Master Controller, use the Master Redundancy method. In this
scenario, two controllers are used at the Management layer with one controller configured as an active
Master and one configured as a standby Master. The two controllers will synchronize databases and RF
planning diagrams, and will run a Virtual Router Redundancy Protocol (VRRP) instance between them
accessed by a Virtual IP (VIP) address. This is the address given to Access Points attempting to discover
a Mobility Controller, and is used for network administration.
One Mobility Controller is always the Active Master Controller, and the other one is always the Standby
Master Controller. Users managing the system will always log into the Active Master. It is not
recommended that pre-emption be enabled on this setup. This configuration is known as "Active-
Standby" redundancy.
In the Aruba Validated Reference Design, the recommended controller model to serve as a Master is the
MMC-3600. The recommended network attachment method is to have each controller configured in a
full mesh with redundant links to separate data center distribution switches.
Listed below is an example of the configuration of the “initially-preferred master”.
The following shows the corresponding VRRP configuration for the peer Master Controller.
vrrp 22
vlan 22
ip address 10.200.22.254
priority 110
authentication <password>
description Preferred-Master
tracking master-up-time 30 add 20
no shutdown
database synchronize period 60
database synchronize rf-plan-data
vrrp 22
vlan 22
ip address 10.200.22.254
priority 100
authentication <password>
description Backup-Master
tracking master-up-time 30 add 20
no shutdown
database synchronize period 60
database synchronize rf-plan data
arun_043
Standby
Master
VRRP
keepalives
Periodic database
synchronization
GRE
Active
Master
PAPI keepalives