Justin Pietsch published a fantastic recap of his experience running OSPF in AWS infrastructure. You MUST read what he wrote, here’s the TL&DR summary:

• Contrary to popular myths, OSPF works well on very large leaf-and-spine networks.
• OSPF nuances are really hard to grasp intuitively, and the only way to know what will happen is to run tests with the same codebase you plan to use in a production environment.

Dinesh Dutt made similar claims on one of our podcasts, and I wrote numerous blog posts on the same topic. Not that anyone would care or listen; it’s so much better to watch vendor slide decks full of the latest unicorn dust… but in the end, it’s usually not the protocol that’s broken, but the network design.