6. REDUNDANCY WITH NX3030 CPU
6.4.3.2. 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 Principles of Operation - Redundant Ethernet Networks with NIC
Teaming section. Automatically, other parameters are enabled and must be configured:
Period of Redundancy Test (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 184: Ethernet Advanced Configuration
In case the answer time for the Redundancy Test reaches the Period of Test 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, Subnetwork Mask and Gateway Address parameters blank in the CPU diagnostics.
ATTENTION
When a Reset Origin is performed in a CPU configured with NIC Teaming enabled for local
Ethernet interfaces (NET 1 and NET 2), 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.
6.4.3.3. Vital failure setting in NET 1 and NET 2
The Advanced option in the setup screen of the NET 1 and NET 2 interfaces, 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 Principles of Operation - Ethernet Interfaces Use with Vital Fault Indication.
When configured in conjunction with the NIC Teaming redundancy, failure is considered vital failure, when a fault occurs
in NET 1 and NET 2 interfaces.
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