OSPF Designated Router

[UncleJP]

I was studying OSPF, and I had a thought. Is there ALWAYS a DR and BDR in an OSPF network? 

Any feedback is appreciated. 

[Scott Leport · Accepted solution]

Not always.

You can enable "ip ospf network point-to-point" on your interface configuration to effectively turn off the DR and BDR election process.

As the name suggests, it's typically used when there are only two routers on either end of a link.

Otherwise yes there is a DR / BDR relationship in an OSPF network, but you can influence what your DR / BDR routers are.

There are a LOT of resources out there, online and books which reference the DR / BDR election process and the various scenarios.

Good luck

[Martin L]

For exam you might want to memorize following tables (from very old Route CCNP book by D.Teare, CiscoPress)