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Chapter 16 Routing Protocols
ZyWALL USG 300 User’s Guide
395
to logically connect the area to the backbone. This is illustrated in the following
example.
Figure 305 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.
1 Enable OSPF.
2 Set up the OSPF areas.
3 Configure the appropriate interfaces. See Section 13.3.1 on page 296.
4 Set up virtual links, as needed.
16.3.1 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.