Distributed gateway: This sounds like a fancy way of saying devices vlans are trunked all over the fabric to wherever the bridge domain lives.
"The ACI fabric decouples the endpoint identity and associated policy from the underlying forwarding graph. It provides a distributed Layer 3 gateway that ensures optimal Layer 3 and Layer 2 forwarding. The fabric supports standard bridging and routing semantics without standard location constraints (any IP address anywhere), and removes flooding requirements for the IP control plane Address Resolution Protocol (ARP) / Gratuitous Address Resolution Protocol (GARP). All traffic within the fabric is encapsulated within VXLAN."
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