Introduction to OSPF behaviour in multi-access segments. We will provide an overview on how the DR/BDR work and why OSPF uses this kind of mechanisms

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Video Description

OSPF behaves in a "special" way when used on "Broadcast"/NBMA segments.

Reduction / optimizations mechanisms are implemented for: 
Adjacency number
LSA exchange

On multi-access segments:
The following are elected:
"Designated Router" - DR
"Backup Designated Router" - BDR

The DR/BDR  are in charge of forming adjacencies with every router on the segment.

The rest of the routers don't have full adjacencies with each other (they remain on 2-WAY)

The different routers on the segment inform (sending LSUs) the DR/BDR of any changes

The DR informs the rest of the routers.



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