As AS-P/B has two On-board Ethernet ports on it so can they be inter-connected.

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The second Ethernet port is currently not meant to be used to connect to another AS-P/B.
The two Ethernet ports are connected to a built-in Ethernet switch. One port should be connected to the site network. The other port can be used to connect a single WorkStation or WebStation, a Modbus TCP unit, or a BACnet/IP device, but not another SmartStruxure server.