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  • Abid Ghufran thinks this is interesting:

the inner destination MAC address exists in its Layer 2 table.

From

Cover of Using TRILL, FabricPath, and VXLAN: Designing Massively Scalable Data Centers (MSDC) with Overlays

Note

Mapping = Remote Switch-ID and Remote Classical Ethernet edge connected Host MAC Address
OR
Mapping = Remote MAC Address ===> Remote Switch-ID