-
Receive the same route 192.168.1.0 from both neighbors:
FortiGate-50E # get router info bgp neighbors 192.168.138.3 received-route
BGP table version is 5, local router ID is 192.168.138.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight RouteTag Path
*>i192.168.1.0 192.168.138.3 100 0 0 i <-/->
Total number of prefixes 1
FortiGate-50E # get router info bgp neighbors 192.168.138.5 received-route
BGP table version is 5, local router ID is 192.168.138.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight RouteTag Path
*>i192.168.1.0 192.168.138.5 100 0 0 i <-/->
Total number of prefixes 1
-
FortiGate prefers the lowest neighbor BGP router ID: When all attributes are equal, FortiGate selects the path from the neighbor with the lowest BGP router ID. The route from neighbor 192.168.138.3 will be chosen and added to the active routing table.
FortiGate-50E # get router info routing-table all
Routing table for VRF=0
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] via 10.9.15.254, wan1
C 10.9.0.0/20 is directly connected, wan1
C 169.254.1.0/24 is directly connected, fortilink
C 172.16.1.0/24 is directly connected, lan
B 192.168.1.0/24 [200/0] via 192.168.138.3, wan2, 00:00:29
C 192.168.138.0/24 is directly connected, wan2
-
The user prefers the neighbor 192.168.138.5. The local preference in the route map can be used to set prefer neighbors. Set higher local preference in neighbor 192.168.138.5 than 192.168.138.3.
-
Config prefix list:
FortiGate-50E (prefix-list) # show
config router prefix-list
edit "prefix-test"
config rule
edit 1
set prefix 192.168.1.0 255.255.255.0
unset ge
unset le
next
end
next
end
-
Config route map:
FortiGate-50E (route-map) # show
config router route-map
edit "route-map-prefer-200"
config rule
edit 1
set match-ip-address "prefix-test"
set set-local-preference 200
next
end
next
edit "route-map-prefer-100"
config rule
edit 1
set match-ip-address "prefix-test"
set set-local-preference 100
next
end
next
end
-
Config route map in BGP:
FortiGate-50E (bgp) # sh
config router bgp
set as 65001
set router-id 192.168.138.1
set network-import-check disable
config neighbor
edit "192.168.138.3"
set soft-reconfiguration enable
set remote-as 65001
set route-map-in "route-map-prefer-100"
set update-source "wan2"
next
edit "192.168.138.5"
set soft-reconfiguration enable
set remote-as 65001
set route-map-in "route-map-prefer-200"
set update-source "wan2"
next
end
config network
edit 1
set prefix 192.168.20.0 255.255.255.0
next
end
end
-
Active routing table:
FortiGate-50E # get router info routing-table all
Routing table for VRF=0
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] via 10.9.15.254, wan1
C 10.9.0.0/20 is directly connected, wan1
C 169.254.1.0/24 is directly connected, fortilink
C 172.16.1.0/24 is directly connected, lan
B 192.168.1.0/24 [200/0] via 192.168.138.5, wan2, 00:00:09
C 192.168.138.0/24 is directly connected, wan2
