Routes are stored in the  Routing Information Bases (RIBs): Adj-RIBs-In. Loc-RIB. Adj-RIBs-Out.
   Adj-RIBs-In.  Stores routing information that has been learned from inbound UPDATE messages; contents represent routes that are available as an input to the Decision Process. Contains unprocessed routing information that has been advertised to the local  BGP speaker by its peers.
 Loc-RIB.   Adj-RIBs-Out.   In BGP, the config network statement is used to originate and advertise a specific prefix. By default, iBGP advertises a prefix only if an exact matching route exists in the routing table.
The 'network-import-check' option controls this behavior. When enabled (this is the default in BGP global settings), BGP advertises a network only if the corresponding route is present in the routing table. If this option is disabled, BGP can advertise the configured prefix even when the route is missing from the routing table or the associated interface is down.
Because disabling network-import-check may result in advertising unreachable networks, it should be used with caution.
This feature was added in FortiOS v7.0.4+: Allow per-prefix network import checking in BGP.
config router bgp
config network
edit 1
set prefix 10.1.2.0 255.255.255.0
set network-import-check global
set backdoor disable
set route-map ''
next
end
end
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