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FTOS Configuration Guide for the C-Series - Force10 Networks

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Figure 376gives some examples of <strong>the</strong> different router designations.<br />

Figure 376 OSPF Routing Examples<br />

Router E Router F<br />

Interior Router<br />

Router A<br />

Backbone Router (BR)<br />

Router D<br />

Not So Stubby Area<br />

Area 100<br />

Router B<br />

Backbone Router<br />

OSPF AS 9999<br />

OSPF AS 8888<br />

Router C<br />

Router 82<br />

Interior Router<br />

Area 300<br />

Router M<br />

Interior Router<br />

Router K<br />

Backbone Area<br />

Area 0<br />

Router 81<br />

Stub Area<br />

Area 200<br />

Router I<br />

Interior Router<br />

Interior Router<br />

Router J<br />

Router L<br />

Router G<br />

Router H<br />

Area Border Router<br />

Autonomous System<br />

Boundary Router<br />

Router K<br />

Autonomous System<br />

Boundary Router<br />

Router 8000<br />

A Backbone Router (BR) is part of <strong>the</strong> OSPF Backbone, Area 0. This includes all Area Border Routers<br />

(ABRs). It can also include any routers that connect only to <strong>the</strong> Backbone and ano<strong>the</strong>r ABR, but are only<br />

part of Area 0, such as Router I in Figure 376 above.<br />

532 Open Shortest Path First

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