The Designated Router (DR) and Backup Designated Router (BDR) exist to reduce redundant LSA flooding on an OSPF multi access link. Routers on a multi access link use the 224.0.0.5 and 224.0.0.6 Multicast IP Addresses to efficiently share LSAs with each other.

In this video we explore the process by which a DR and BDR are elected. We discuss the WAIT interval in OSPF, we discuss Preemption and Priority numbers. We wrap up the video by showing you the sequence of events that occurs when a routing update needs to be sent on a link with a Designated Router and Backup Designated Router.

This is Lesson 6 of the Practical OSPF series:
   • Practical OSPF  

00:00 - Intro
00:11 - DR BDR - Review
01:26 - Electing Process: DR, BDR, and Drothers
06:14 - Neighbor Adjacency Process - Full or 2-WAY
08:29 - DR / BDR / Priority are Per-Interface, not Per-Router
09:06 - Deterministic Designated Router by setting Priority
12:07 - Routing Updates from DR, BDR, and Drothers - 224.0.0.5 - 224.0.0.6
15:27 - Packet Capture of OSPF DR BDR Election Process and Routing Updates

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📜 More free CCNA resources:
https://www.practicalnetworking.net/i...

Packet Capture:
https://ln5.sync.com/dl/ea7838d80/itq...

#ospf #ccna #neighbors