482| VRRP DellPowerConnect W- Series ArubaOS 6.2 | User Guide
Command Description
synchronizing databases.Thi s data is included by default.
database synchronize period <minutes> Thisconfig m ode command defines the scheduled interval for
synchronizing thedatabases.
To view the database synchronization settings on the controller, uset hefollowing command:
(host) #show database synchronize
Enabling Incre mental Configu ration Synchro nization (CLIOnly)
Typically whent hemaster and the local is synchronized, the complete configuration is sent to the local. You can,
now send onlyt hei ncrementalupdates to the local by using the following CLI commands
Use the following commands for incrementalconfiguration synchronization:
Command Description
cfgm set sync-type <complete> Them astersends full configuration file to the local.
cfgm set sync-type <snapshot> Them astersends only the incremental configuration to the
local.
NOTE:By default, this configuration i s enabled.
cfgm set sync-command-block <number> Toconfigure the number of comm and-list blocks. Each
blockcontains a listof global configuration commandsfor
eachw rite-mem operation. Bydefault, the number is 3.
showm aster-configpending Toshow a l istof global commands,w hich are not saved
butare sent to the local.
clear master-local-session<A.B.C .D> Tom anually push thefull configurationto the local.

Table14 3:

IncrementalConfigurationSynchronizationC ommands

Configuring Master-Local Controller Redundancy
This section outlines the concepts behind a redundancysolution where a master can act as a backup for one or more
localD ellco ntrollersand shows how to configure the Dell controllers for such a redundantso lution. In this solution,
the localD ellcontrollers act as the controller for the APs. When any one of thelocal Dell controllers becomes
unavailable,the master takes over the APs controlled by that local controller fort het ime that the localco ntroller
remainsunavailable. It is configureds ucht hat when the local controllercomes back again, it can take control over
the APs once more.
This type of redundant solution is illustrated by the following topology diagram.
NOTE:Thi s solution requires that the master controller have Layer-2 connectivity to all the local Dell controllers.