Which parameter should be configured to scale iBGP sessions?

Comprehensive and Detailed Explanation From Exact Extract documents and Knowledge:

In large-scale enterprise deployments like ADVPN (Auto-Discovery VPN), managing a huge number of individual BGP neighbor statements is not scalable. To scale the establishment and management of iBGP sessions , FortiGate utilizes the neighbor-range parameter.

According to the ADVPN configuration guide, the neighbor-range command allows a Hub to listen for and automatically accept dynamic BGP peering requests from any Spoke within a specified IP prefix range. This eliminates the need for the administrator to manually define each Spoke ' s IP address on the Hub, which is essential for scaling to hundreds or thousands of branches. While route-reflector-client (Option C) is a parameter used within the neighbor-group (Option A) to allow the Hub to reflect routes, it is the neighbor-range that technically scales the Hub ' s ability to handle the large volume of incoming sessions.

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