Dell C9000 Series Networking Configuration Manual page 744

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The following example shows different router designations.

Figure 98. OSPF Routing Examples

Backbone Router (BR)

A backbone router (BR) is part of the OSPF Backbone, Area 0.

This includes all ABRs. It can also include any routers that connect only to the backbone and another ABR, but

are only part of Area 0, such as Router I in the previous example.

Open Shortest Path First (OSPFv2 and OSPFv3)

Troubleshooting