6.7 Data Network Redundancy
6.7.1 Redundancy
Note: Both outputs of a pair are active at the same time; therefore the use of
primary and secondary ports is meaningless in this configuration.
The four Ethernet data ports operate as two redundant pairs. Data 1 and 2 (Ge 1
with Ge 2) are inputs and Data 3 and 4 (Ge 3 with Ge 4) are outputs.
When an output Transport Stream is defined, it is assigned by the user to
Data 3 and 4.
Both ports are independent of each other i.e. the IP address, MAC address, subnet
mask and default gateway can have different settings. Both ports are active at the
same time and transmit the same data. If both ports are configured to be on the
same subnet, only one port will respond to ICMP messages.
Figure 6.11 Data Network Redundancy
The data ports can raise an alarm during abnormal operational conditions.
6.8 Data Routing
6.8.1 Packet Processing
Every received packet is examined and based on a routing table, determines where
the packet should be routed, or whether the packet should be dropped.
The only received packets that need to be processed are:
• ARP
• ICMP
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