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Configuring gated
Configuring the OSPF Protocol
Chapter 376
Defining Backbones
The OSPF backbone distributes routing information between areas. You
can define backbones with the same statements and clauses as areas.
You need not define the stub statement for a backbone. The backbone
statement is used to define a router as a backbone router. If an OSPF
internal or area boarder router is also a backbone router, the backbone
statement must follow the area statements in the /etc/gated.conf file.
Whenever you configure an area border router (a router connected to
multiple areas), you must provide the backbone.
Figure 3-10 shows an example of two area border routers that form part
of a backbone. Router A has interfaces to both area 0.0.0.1 and area
0.0.0.2, while router B has interfaces to areas 0.0.0.3 and 0.0.0.4. Router
A is connected to router B through interface 15.13.115.156.
Figure 3-10 Backbone Configuration Example
The following is an example of the backbone router definition in router
A’s /etc/gated.conf file:
Router A Router B
Area 0.0.0.1
Area 0.0.0.2 Area 0.0.0.4
Area 0.0.0.3
15.13.115.156