Which routing protocol is required to establish a routing adjacency between FortiSASE and FortiGate SD-WAN hub?

The Border Gateway Protocol (BGP) is the required routing protocol to establish a routing adjacency between FortiSASE and a FortiGate SD-WAN hub. BGP is widely used for routing between different autonomous systems on the internet, providing the necessary scalability and control that modern networks require when dealing with multiple connections and complex routing decisions.

In the context of FortiSASE, BGP facilitates the dynamic routing of traffic through the SD-WAN architecture, allowing for efficient path selection based on policies, performance metrics, and real-time network conditions. This protocol supports features like route aggregation, policy-based routing, and the ability to handle multiple routing paths, which are essential for optimizing performance across distributed network environments.

Other routing protocols such as OSPF, RIP, and EIGRP are typically employed in different scenarios. OSPF is commonly used in intra-domain routing for its efficiency in handling large networks but may not suit the inter-domain connections FortiSASE requires. RIP is a simpler protocol that is less commonly used in modern networks due to its limitations in scalability and convergence speed. EIGRP, while effective within a Cisco environment, is proprietary and may not be compatible with all devices involved in an SD-WAN deployment.

Thus, the