ADC CUDA 3 - Manual (Page 79)

Cuda 12000 IP Access Switch CLI-based Administration Guide
Understanding Management Module Redundancy 77
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-config CLI command. 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 chassis software
■
Establishes connections with all other cards in the chassis
When the secondary management module activates its copy of the BAS
software and establishes connections to cards, the secondary management
module also starts services, including disk-mirroring and LDAP. Through disk
mirroring, the software on the two management modules share data.
When a switch to a secondary management module occurs:
■
Services are unavailable for a brief period of time
■
Network management access is prevented for a brief period of time.
The Cuda’s data-forwarding operation is not disrupted while a switchover to
a backup occurs.