{"id":449,"date":"2024-07-26T18:56:41","date_gmt":"2024-07-26T18:56:41","guid":{"rendered":"https:\/\/www.zframez.com\/articles\/?p=449"},"modified":"2024-09-13T11:06:30","modified_gmt":"2024-09-13T11:06:30","slug":"ospf-configuration-examples-dr-bdr-election","status":"publish","type":"post","link":"https:\/\/www.zframez.com\/articles\/routing\/ospf-configuration-examples-dr-bdr-election","title":{"rendered":"OSPF Configuration Example 3 : DR BDR election"},"content":{"rendered":"\n

Configuring OSPF DR and BDR with Interface Priority and Router ID<\/strong><\/h1>\n\n\n\n

In all shared networks like Ethernet, Frame Relay, and ATM, OSPF selects one router as the DR and another as the BDR. The DR reduces the number of adjacencies in these networks, preventing the flow of duplicate LSAs. You can check our other tutorial about DR and BDR election<\/a> to get a detailed understanding of this election process.<\/p>\n\n\n\n

In an ideal scenario where all routers connect to a shared network at the same time, OSPF considers the interface priorities for the election. The router with the highest interface priority gets elected as the DR. In the following OSPF configuration example, we will verify this behavior using four routers connected to an Ethernet switch.<\/p>\n\n\n\n

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Table of Contents<\/h3>\n