Which protocol is supported on Native/OnPrem environments in Kubernetes CNF mode, but not on public clouds?

In Kubernetes environments, particularly when deploying within Native/On-Premises configurations in CNF (Container Network Function) mode, specific protocols are utilized to support networking needs. One of the protocols that is commonly found in these environments but not in public cloud environments is OSPF (Open Shortest Path First).

OSPF is a routing protocol that is used to facilitate the exchange of routing information between routers within a single autonomous system. It’s typically employed in scenarios where there is a need for dynamic routing, which allows for more robust network designs through the optimization of routing paths. On-prem environments tend to have a more controlled and customizable routing setup, enabling the use of OSPF to manage complex internal routing requirements effectively.

Conversely, public cloud environments tend to operate with more abstracted network management solutions and offer managed network services that may not support OSPF due to their specific infrastructure and the services they provide. Instead, these environments often rely on simplified and less configurable routing solutions.

Therefore, OSPF is characteristic of on-premises deployments in CNF mode due to its compatibility with complex routing scenarios, while public cloud environments typically do not support it, leading to its identification as the distinct protocol in this context.