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For example, this can happen when advertising 192.168.1.1/32 on BGP statically.
Routing table:
get router info routing-table details 192.168.1.1
Routing table for VRF=0
Routing entry for 192.168.1.0/24
Known via "static", distance 10, metric 0, best
* vrf 0 192.168.1.254, via port2
Command to check the advertised-routes to neighbors:
get router info bgp neighbors x.x.x.x advertised-routes
192.168.1.1/32 will not be shown on the advertised routes. Since the active route on routing-table is only 192.168.1.0/24, it shows a /24 network in the BGP advertised routes.
Solution:
While advertising a single IP in the whole network, it is necessary to create a separate static route for the IP to have an active route and be advertised in the BGP.
In GUI, go to Network -> Static Routes and select 'Create New'.
Destination: 192.168.1.1/32.
Gateway Address: 192.168.1.254.
Interface: port2.
Administrative Distance: 10.
Status: Enable.
In CLI:
config router static
edit 0
set dst 192.168.1.1/32
set gateway 192.168.1.254
set device port2
set status enable
next
end
For reference on creating a static route via GUI but in this case, 192.168.1.1/32 will be set as the destination address:
Technical Tip: How to create a static route on FortiGate from the GUI Interface
After creating a static route for the single IP, it will be possible to see the IP information in 'advertised BGP routes'.
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