User's Manual

585 | Increasing Network Uptime Through
Redundancy and VRRP
Dell Networking W-Series ArubaOS 6.4.x| User Guide
Command Description
cfgm set sync-type <complete>
The master sends full configuration file to the local.
cfgm set sync-type <snapshot>
The master sends only the incremental
configuration to the local.
NOTE: This configuration is enabled by default
cfgm set sync-command-block <number>
To configure the number of command-list blocks.
Each block contains a list of global configuration
commands for each write-mem operationThe
number is 3 by default
show master-configpending
To show a list of global commands, which are not
saved but are sent to the local.
clear master-local-session <A.B.C.D>
To manually push the full configuration to the local.
Table 109: Incremental Configuration Synchronization Commands
Configuring Master-Local Controller Redundancy
This section outlines the concepts behind a redundancy solution where a master can act as a backup for one or
more local controllers, and shows how to configure the Dell controllers for such a redundant solution. In this
solution, the local controllers act as the controller for the APs. When any one of the local controllers becomes
unavailable, the master takes over the APs controlled by that local controller for the time that the local
controller remains unavailable. It is configured such that when the local controller comes back again, it can take
control over the APs once more.
This type of redundant solution is illustrated by the following topology diagram.
This solution requires that the master controller have Layer-2 connectivity to all the local controllers.
Figure 62 Redundant Topology: Master-Local Redundancy
The network in Figure 62, the master controller is connected to the local controllers on VLANs 1 through n
through a Layer-2 network. To configure redundancy as described in the conceptual overview for master-local
redundancy, configure VRRP instances on each of the VLANs between the master and the respective local