Design Reference

3. Configure the IP address, subnet mask, and VLAN ID for the port.
4. Disable RIP on the port, if you do not need 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 (LSDB).
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 traffic between S1 and S3 is indirect, and passes
through S2.
Figure 23: Example 2: OSPF on two subnets in one area
The routers in example 2 use the following configuration:
• S1 has an OSPF router ID of 1.1.1.1, and the OSPF port uses an IP address of
192.168.10.1.
• S2 has an OSPF router ID of 1.1.1.2, and two OSPF ports use IP addresses of
192.168.10.2 and 192.168.20.1.
• S3 has an OSPF router ID of 1.1.1.3, and the OSPF port uses an IP address of
192.168.20.2.
The general method to configure OSPF on each routing switch is:
1. Enable OSPF globally.
2. Insert IP addresses, subnet masks, and VLAN IDs for the OSPF ports on S1 and
S3, and for the two OSPF ports on S2. The two ports on S2 enable routing and
establish the IP addresses related to the two networks.
3. Enable OSPF for each OSPF port allocated with an IP address.
After you configure all three switches for OSPF, they elect a DR and BDR for each subnet and
exchange hello packets to synchronize their LSDBs.
Layer 3 network design
64 Network Design Reference for Avaya VSP 4000 February 2014
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