olemus
kahekihiline arhitektuur, raamatuköite analoog:
ülakihis on selgseadmed, alakihis on lehtseadmed
= a two-layer, full-mesh topology composed of a leaf layer and a spine layer, with the leaf and spine switches

ülevaateid
https://study-ccna.com/spine-and-leaf-architecture/

https://www.arubanetworks.com/spine-leaf-architecture/

https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white-paper-c11-737022.html

https://community.fs.com/blog/leaf-spine-with-fs-com-switches.html