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3750-E Series OBM port connectivity

What are the connectivity issues regarding interconnecting OBM port ("fa0" port on back of switch) to a switchport on the same switch.

(1) Need to manage several switches via OBM (fa0) ports

(2) Need to firewall the mgmt VLAN. DG on FW.

(3) For switch connected to FW, want to also use fa0 port(same config for all switches. Connect fa0 to switchport via physical cable.

Problem: (a) No connectivity to fa0 when interconnected via switchport, can reach other OBM connected switches but not own switch/port (b) Connectivity Ok when use SVI interface instead of fa0 (OBM port).

fa0 --> L3 Interface (VLAN A)

Switch --> L2 with DG (VLAN A)

Switchport --> mode access (VLAN A)

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