Are there any restriction to the cabling of BMENOC0301 and BMENOC0311 in a standalone system

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When the Ethernet backplane port of BMENOC0301 or BMENOC0311 is enabled, the NOC is directly connected to the CPU. The backplane port is not protected by RSTP, Only ports 2 and 3 are protected. Connecting the NOC and the CPU via an external cable may create an unhandled network loop that may impact network communications. Refers to the User Documentation for more details

When the BMENOC's Ethernet backplane port is enabled, do not make any connections between the NOC and the CPU via an external Ethernet cable.