What routing protocol is used by the NGFW to peer with border-leaf switches in a North/South ACI deployment?

In a North/South ACI deployment, Border Gateway Protocol (BGP) is commonly used to enable external routing between the data center network and external networks, such as service providers or the internet. This is particularly beneficial for environments that require high scalability and dynamic routing capabilities.

Using eBGP provides the necessary control when peering with external devices, making it an ideal choice in this context. While internal routing protocols like OSPF and RIP could theoretically be used within the data center environment, they do not offer the same level of flexibility and scalability as BGP does for external connections.

In the context of data center architecture, especially for cloud or large-scale deployments, BGP is preferred for its robustness in routing Internet Protocol (IP) traffic and its ability to handle complex topologies effectively, which also includes establishing peering relationships with the border-leaf switches in a North/South architecture.