Chapter 14 Routing Protocols

to logically connect the area to the backbone. This is illustrated in the following example.

Figure 183 OSPF: Virtual Link

In this example, area 100 does not have a direct connection to the backbone. As a result, you should set up a virtual link on both ABR in area 10. The virtual link becomes the connection between area 100 and the backbone.

You cannot create a virtual link to a router in a different area.

OSPF Configuration

Follow these steps when you configure OSPF on the ZyWALL.

1Enable OSPF.

2Set up the OSPF areas.

3Configure the appropriate interfaces. See Section 11.3.1 on page 221.

4Set up virtual links, as needed.

14.3.1 Configuring the OSPF Screen

Use the first OSPF screen to specify the OSPF router the ZyWALL uses in the OSPF AS and maintain the policies for redistribution. In addition, it provides a summary of OSPF areas, allows you to remove them, and opens the OSPF Add/Edit screen to add or edit them.

 

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