Technical information

Cuda 12000 IP Access Switch CudaView Administration Guide
Understanding Management Module Redundancy 109
Understanding Management Module Redundancy
Each chassis is equipped with at least one management module, which
controls the chassis. For management module redundancy, the Cuda 12000
supports installation of two management modules. When two management
modules are installed, one acts as the primary management module and the
other acts as the secondary management module.
When a Cuda 12000 that is configured with two management modules
reboots, the Cuda 12000 randomly determines which module acts as the
primary and which module acts as the secondary. The STATUS DISPLAY LED
on the management module indicates whether the management module is a
primary or secondary (for example, the LED on a primary management
module displays “PRIMARY”).
The primary management module is the active management module on the
Cuda 12000. When you use CudaView to manage the Cuda 12000, you are
interacting with the primary management module.
The secondary management module has two responsibilities:
■ Monitor the state of the primary management module
■ Keep its mirrored disk sectors synchronized with the primary
management module
A secondary management module can take over the primary role in two
ways:
■ Automatically, when the secondary management module detects that the
primary management module is not functioning properly.
■ Manually, through the Chassis Designation tab. In this case, you use the
command to force the current primary management module into the
secondary role, which in turn forces the current secondary management
module into the primary role.
When the secondary management module takes over the primary role, the
secondary:
■ Activates its copy of the Cuda 12000 software
■ Establishes connections with all other cards in the chassis