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Router Types
Router types are attributes of the OSPF process.
A given physical router may be a part of one or more OSPF processes. For example, a router connected to more than one area,
receiving routing from a border gateway protocol (BGP) process connected to another AS acts as both an area border router
and an autonomous system router.
Each router has a unique ID, written in decimal format (A.B.C.D). You do not have to associate the router ID with a valid IP
address. However, to make troubleshooting easier, Dell Networking recommends that the router ID and the router’s IP address
reflect each other.
The following example shows different router designations.
Figure 100. 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)
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