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I believe all CNIs default to vxlan, yes. It's the most common and portable cluster network overlay provider.

thanks @creamy-pencil-82913! Then I'll ignore the hype about Calico in the documentation 😂 seems like I should download a VXLAN book marketable skill there...plenty of cisco pdfs. LAN Extension, Professor Jain does talk about it https://www.cse.wustl.edu/~jain/cse570-18/m_09dmt.htm