4.3.1. Feature Description 
For increased resilience, OpenScape 4000 SoftGate can be connected
with two LAN cables to different switches/router.
Additionally you have to activate the LAN Redundancy feature in the
OpenScape 4000 Platform Administration (Portal) or by editing the initialcfg.xml
file.
Scenarios when SoftGate server is starting up
Scenario 1: Both LAN cables are connected
LAN port 1 (1. Slave interface) will always be activated. LAN port
2 (2. Slave interface) will be on .
Scenario 2: Only one LAN cable is connected
The connected LAN port (LAN1 or LAN2) will be used.
Scenario when board is active
If the active LAN port is disconnected/disabled by peer or equipment
(when both LAN ports are connected):
- The Linux OS activates the LAN port.
- The "new" active LAN port sends a GRATUITOUS ARP with the same MAC and IP addresses as the "old" port.
- If ports switch, the payload will be lost for < 2 sec - all active connections will be saved and NOT disconnected.
- If the "old" port comes up again, no port switchback will be performed.