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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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OSPF DR and BDR Elections

In this chapter, I have discussed OSPF in detail; however, I need to expand the section on designated routers and backup designated routers that I’ve only briefly touched on so far. I’m also going to delve deeper into verifying the election process as well as provide you with a hands-on lab at the end of the chapter to help you understand that process even better.

To start with, I need to make sure you fully understand the terms neighbors and adjacencies again because they’re really crucial to the DR and BDR election process. The election process happens when a broadcast or non-broadcast multi-access network is connected to a router and the link comes up. (Think Ethernet or Frame Relay.)

Neighbors

Routers that share ...

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