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There's a discussion about Network Design in the Operations Guide on the OpenStack Docs site.

This may be relevant to your question, drawn from that page, "Consider creating other private networks for communication between internal components of OpenStack, such as the Message Queue and OpenStack Compute. VLANs are great for these scenarios."

You may need to do VLAN tagging to achieve the private networks for internal comms. You may need another NIC for public interfaces to APIs, Swift Proxy, and so on. Really depends on what you and your users need.

I'll also say the disclaimer "I just read/write docs and don't manage networks for a living."