BGP Neighbor Ranges

We might, if you post relevant BGP config "show router bgp" on both sides and verification of reachability between neighbor IPs like ping results.

Toshi

You may also check this BGP Resource List https://community.fortinet.com/t5/FortiGate/Technical-Tip-FortiOS-BGP-Resource-List/ta-p/214290 and see if it helps.

Hi @AUT_Maverick 

It would be good to show us how you configure the BGP neighbor range. You may also refer to the following article for the configuration example of BGP neighbor group:

https://docs.fortinet.com/document/fortigate/6.4.2/administration-guide/390427/configure-bgp

config router bgp     set as 65500     set router-id 10.10.0.1     set ebgp-multipath enable     set graceful-restart enable     config neighbor-group         edit "branch-peers-1"             set soft-reconfiguration enable             set remote-as 65501         next         edit "branch-peers-2"             set soft-reconfiguration enable             set remote-as 65501         next     end     config neighbor-range         edit 1             set prefix 10.254.0.0 255.255.255.0             set neighbor-group "branch-peers-1"         next         edit 2             set prefix 10.254.1.0 255.255.255.0             set neighbor-group "branch-peers-2"         next     end
end

 If you are having problem with neighbor establishment, it would be good to check the connectivity state that prevents the establishment and take packet capture to further investigate on it:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-BGP-Neighbor-Adjacency-States/ta-p/208989