On both FortiGate units:

config router ospf

config ospf-interface

edit “WAN2_higher_cost” set cost 200

set interface “wan2” end

Now both FortiGate units use only the WAN1 route:

 

FortiGate 1:

FGT1 # get router info routing-table ospf

O*E2 0.0.0.0/0 [110/10] via 10.182.0.187, wan1, 00:00:40

O 192.168.182.0/23 [110/20] via 10.182.0.187, wan1, 00:00:40

 

FortiGate 2:

FGT2 # get router info routing-table ospf

O 10.160.0.0/23 [110/20] via 10.182.0.57, wan1, 00:09:37

 

LSDB check on FortiGate 1:

FGT1 # get router info ospf database router lsa

Router Link States (Area 0.0.0.0) LS age: 81

Options: 0x2 (*|-|-|-|-|-|E|-)

Flags: 0x0

LS Type: router-LSA

Link State ID: 10.1.1.1

Advertising Router: 10.1.1.1

LS Seq Number: 8000000b

Checksum: 0xe637

Length: 60

Number of Links: 3

Link connected to: Stub Network

(Link ID) Network/subnet number: 10.160.0.0 (Link Data) Network Mask: 255.255.254.0

Number of TOS metrics: 0

TOS 0 Metric: 10

Link connected to: a Transit Network

(Link ID) Designated Router address: 10.183.0.187 (Link Data) Router Interface address: 10.183.0.57

Number of TOS metrics: 0

TOS 0 Metric: 200

Link connected to: a Transit Network

(Link ID) Designated Router address: 10.182.0.57 (Link Data) Router Interface address: 10.182.0.57

Number of TOS metrics: 0

TOS 0 Metric: 10

LS age: 83

Options: 0x2 (*|-|-|-|-|-|E|-) Flags: 0x2 : ASBR

LS Type: router-LSA

Link State ID: 10.2.2.2

Advertising Router: 10.2.2.2

LS Seq Number: 8000000e

Checksum: 0xfc9b

Length: 60

Number of Links: 3

Link connected to: Stub Network

(Link ID) Network/subnet number: 192.168.182.0 (Link Data) Network Mask: 255.255.254.0

Number of TOS metrics: 0

TOS 0 Metric: 10

Link connected to: a Transit Network

(Link ID) Designated Router address: 10.183.0.187 (Link Data) Router Interface address: 10.183.0.187

Number of TOS metrics: 0

TOS 0 Metric: 200

Link connected to: a Transit Network

(Link ID) Designated Router address: 10.182.0.57 (Link Data) Router Interface address: 10.182.0.187

Number of TOS metrics: 0

TOS 0 Metric: 10

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