Avaya 8800 Planning And Engineering, Network Design page 133

Example 1: OSPF on one subnet in one area
Example 1 describes a simple implementation of an OSPF network: enabling OSPF on two switches
(S1 and S2) that are in the same subnet in one OSPF area. See the following figure.
Figure 54: Example 1: OSPF on one subnet in one area
The routers in example 1 have the following settings:
• S1 has an OSPF router ID of 1.1.1.1, and the OSPF port is configured with an IP address of
192.168.10.1.
• S2 has an OSPF router ID of 1.1.1.2, and the OSPF port is configured with an IP address of
192.168.10.2.
The general method used to configure OSPF on each routing switch is as follows:
1. Enable OSPF globally.
2. Verify that IP forwarding is enabled on the switch.
3. Configure the IP address, subnet mask, and VLAN ID for the port.
4. If RIP is not required on the port, disable it.
5. Enable OSPF for the port.
After you configure S2, the two switches elect a designated router (DR) and a backup designated
router (BDR). They exchange Hello packets to synchronize their link state databases.
Example 2: OSPF on two subnets in one area
The following figure shows a configuration in which OSPF operates on three switches. OSPF
performs routing on two subnets in one OSPF area. In this example, S1 directly connects to S2, and
S3 directly connects to S2, but any traffic between S1 and S3 is indirect, and passes through S2.
Figure 55: Example 2: OSPF on two subnets in one area
June 2016 Planning and Engineering — Network Design
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