Configuring OSPF on the FortiGate units
Three of the routers are designated routers (DR) and one is a backup DR (BDR). This is achieved through the lowest router ID numbers, or OSPF priority settings.
Also each area needs to be configured as each respective type of area – stub, backbone, or regular. This affects how routes are advertised into the area.
To configure OSPF on Router1 – web-based manager
1. Go to Router > Dynamic > OSPF.
2. Enter 11.101.1 for the Router ID and select Apply.
3. In Areas, select Create New, set the following information, and select OK.
Area 1.1.1.1
Type Stub
Authentication None
4. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.101.0/255.255.255.0
Area 1.1.1.1
5. In Interfaces, select Create New, set the following information, and select OK.
Name Accounting
Interface port1 (internal)
IP 10.11.101.1
Authentication None
6. In Interfaces, select Create New, set the following information, and select OK.
Name Backbone1
Interface port2 (external1)
IP 10.11.110.1
Authentication None
To configure OSPF on Router2 – web-based manager
1. Go to Router > Dynamic > OSPF.
2. Enter 11.102.2 for the Router ID and select Apply.
3. In Areas, select Create New, set the following information, and select OK.
Area 0.0.0.0
Type Regular
Authentication None
4. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.102.2/255.255.255.0
Area 0.0.0.0
5. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.110.2/255.255.255.0
Area 0.0.0.0
6. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.111.2/255.255.255.0
Area 0.0.0.0
7. In Interfaces, select Create New, set the following information, and select OK.
Name RnD network
Interface port1 (internal)
IP 10.11.102.2
Authentication None
8. In Interfaces, select Create New, set the following information, and select OK.
Name Backbone1
Interface port2 (external1)
IP 10.11.110.2
Authentication None
9. In Interfaces, select Create New, set the following information, and select OK.
Name Backbone2
Interface port3 (external2)
IP 10.11.111.2
Authentication None
To configure OSPF on Router3 – web-based manager
1. Go to Router > Dynamic > OSPF.
2. Enter 11.103.3 for the Router ID and then select Apply.
3. In Areas, select Create New, set the following information, and then select OK.
Area 0.0.0.0
Type Regular
Authentication None
4. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.102.3/255.255.255.0
Area 0.0.0.0
5. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.110.3/255.255.255.0
Area 0.0.0.0
6. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.111.3/255.255.255.0
Area 0.0.0.0
7. In Interfaces, select Create New, set the following information, and select OK.
Name RnD network
Interface port1 (internal)
IP 10.11.103.3
Authentication None
8. In Interfaces, select Create New, set the following information, and select OK.
Name Backbone1
Interface port2 (external1)
IP 10.11.110.3
Authentication None
9. In Interfaces, select Create New, set the following information, and select OK.
Name Backbone2
Interface port3 (external2)
IP 10.11.111.3
Authentication None
To configure OSPF on Router4 – web-based manager
1. Go to Router > Dynamic > OSPF.
2. Enter 11.104.4 for the Router ID and then select Apply.
3. In Areas, select Create New.
4. Set the following information, and select OK.
Area 2.2.2.2
Type Regular
Authentication None
5. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.104.0/255.255.255.0
Area 0.0.0.0
6. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 10.11.111.0/255.255.255.0
Area 0.0.0.0
7. In Networks, select Create New, set the following information, and select OK.
IP/Netmask 172.20.120.0/255.255.255.0
Area 0.0.0.0
8. In Interfaces, select Create New, set the following information, and select OK.
Name Network Admin network
Interface port1 (internal)
IP 10.11.104.4
Authentication None
9. In Interfaces, select Create New, set the following information, and select OK.
Name Backbone2
Interface port2 (external2)
IP 10.11.111.4
Authentication None
10. In Interfaces, select Create New, set the following information, and select OK.
Name ISP
Interface port3 (ISP)
IP 172.20.120.4
Authentication None