LAN Control (Master CM/Slave CM)
This section explains how the LAN control controller of the ETERNUS DX operates.
Of the two controllers in the
ETERNUS DX, the controller (CM) that is given the authority to manage the LAN is
called the Master CM and the CM that takes over the management when the Master CM fails is called the Slave
CM.
When an error occurs in the Master CM or LAN, the Master CM is switched automatically.
IP addresses of the LAN ports are not assigned to each CM. These IP addresses are assigned to the role of master
or slave. If the Master CM is switched, the same IP addresses are reused. Therefore, even if the Master CM is
switched and the physical port is changed, access can be maintained via the same IP addresses. The MAC
address is not inherited.
Figure 104 LAN Control (Switching of the Master CM)
ETERNUS DX
ETERNUS DX
The Master CM is switched.
Controller enclosure
MNT
CM#0
Master CM
MNT
CM#1
Slave CM
RMT
FST
FST
RMT
IP address A
IP address A
Controller enclosure
MNT
CM#0
Slave CM
MNT
CM#1
Master CM
RMT
FST
FST
RMT
CM#0
has failed
When the Master CM is
switched, the IP addresses of
the previous Master CM are
taken over by the new
Master CM.
5. Connection Configuration
LAN Connection
206 Design Guide
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