6. Redundancy with NX3030 CPU
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ATTENTION:
The NET 2 configuration screen has the same structure as the NET 1 configuration screen, but it
doesn’t have the checkbox “Redundancy”, neither the NIC Teaming configuration parameters.
NIC Teaming between NET 1 and NET 2
The advanced option on the NET 1 configuration screen opens a new configuration screen, which
defines if NET 1 will be redundant. In case the checkbox for Redundancy of Communication is
marked, the NET 1 and NET 2 interfaces form a redundant pair with NIC Teaming, as described in
the Redundant Ethernet Networks with NIC Teaming section.
Automatically, other parameters are enabled and must be configured:
Redundancy Test Period (ms): Period to transfer the communication test frame between the two
NETs. It can be configured with values between 100 and 9900
Retries of Redundancy Test: Maximum number of times the NET, which has sent the frame, will
wait for an answer. It can be configured with values between 1 and 100
Switching Period (s): Maximum time the Active NET will wait for any package. It can be
configured with values between 1 and 25
Figure 6-21. Ethernet advanced configuration
In case the answer time for the Redundancy Test reaches the Test Period times the Number of Retries
and the active interface remains for a while longer than the Switching Period without receiving any
package, a switchover will occur, turning active the interface that was inactive. It is important to
stress that there is a delay between the failure detection and the activation of the inactive interface,
due to the time necessary to interface configuration. This delay could be up to a few dozens of
milliseconds.
When one of the NETs is active, it assumes the IP address configured, and the inactive NET remains
with its configured IP address parameters, Subnet Mask and Gateway Address blank in the CPU
diagnostics.
ATTENTION:
When a Reset Origin is performed in a CPU configured with NIC Teaming enabled for local
Ethernet interfaces (NET1 and NET2), only the last active interface before the reset will be
accessible. After the reset command, the accessible interface could be viewed in the CPU’s
Informative and Configuration Menu.
Vital failure setting in NET 1 and NET 2
The Advanced option in the setup screen of the NET 1 interfaces and NET2, opens a configuration
screen where in addition to enable communication redundancy is also possible to configure if the
interface will generate a switchover in case of failure as described in Ethernet Interfaces Use with
Vital Fault Indication.
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