OSPF - BROADCAST AND NON-BROADCAST NETWORK TYPES

Operation of the OSPF broadcast and non-broadcast network types, selection of the DR / BDR roles and overall operation.

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Video Description

DR / BDR election
BDR is elected first and then promoted to DR

Process is repeated to elected the BDR.

Attributes that decide the election are:
Highest priority
Highest Router-id

A priority of 0 excludes the device from becoming DR/BDR

In reality, the decisive factor is the order in which routers come up

On Hub and Spoke, there shouldn't be a BDR

On broadcast networks, messages are generated for 224.0.0.5 (All routers) / 224.0.0.6 (DR/BDR)

Broadcast:
There is a DR/BDR election
Multicast messages
Timers: H10s/D40s
Non-broadcast
There is a DR/BDR election
Unicast messages
Timers: H30s/D120s

Rating

Global

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