Configuring other networking devices
The other networking devices required in this configuration are on the two ISP networks, the BGP network for the main Internet connection, and the DSL backup connection.
In both cases, the ISPs need to be notified of the OSPF network settings including router IP addresses, timer settings, and so on. The ISP will use this information to configure its routers that connect to this OSPF network.
Testing network configuration
Testing the network configuration involves two parts: testing the network connectivity, and testing the OSPF routing.
To test the network connectivity use ping, traceroute, and other network tools.
To test the OSPF routing in this example, refer to the troubleshooting outlined in Basic OSPF example on page 392.
Advanced inter-area OSPF example
This example sets up an OSPF network at a large office. There are three areas, each with two routers. Typically OSPF areas would not be this small, and if they were the areas would be combined into one bigger area. However, the stub area services the accounting department which is very sensitive about their network and do not want any of their network information broadcast through the rest of the company. The backbone area contains the bulk of the company network devices. The regular area was established for various reasons such as hosting the company servers on a separate area with extra security.
One area is a small stub area that has no independent Internet connection, and only one connection to the backbone area. That connection between the stub area and the backbone area is only through a default route. No routes outside the stub area are advertised into that area. Another area is the backbone, which is connected to the other two areas. The third area has the Internet connection, and all traffic to and from the Internet must use that area’s connection. If that traffic comes from the stub area, then that traffic is treating the backbone like a transit area that only uses it to get to another area.
In the stub area, a subnet of computers is running the RIP routing protocol and those routes must be redistributed into the OSPF areas.
This section includes the following topics:
- Network layout and assumptions
- Configuring the FortiGate units
- Configuring OSPF on the FortiGate units
- Configuring other networking devices
- Testing network configuration