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This is one of multiple videos discussing OSPF designated rider and backup designated rider elections.

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Have a look at this segment connected to this layer to switch, which Rada will become the designated

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rider.

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Will it be rider one with this IP address ten 111.

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Property 100.

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Or will it be rather to using the default priority and IP address ten 112.

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Or will it be right of three with a priority of 20?

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IP addresses ten 113.

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Or will it be rather fall with a party of zero?

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IP Address ten 114 Which writer will become the designated writer on this segment?

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What do you think?

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So let's see if you can answer some additional questions.

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What is the default priority in OSPF?

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What happens when a router has a priority of zero?

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Is it highest or lowest priority that makes a router win an election?

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Is priority even used?

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Is it highest or lowest IP address?

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In this topology.

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I've shut down all the interfaces on the switch.

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And what I'll do now is enable them so that all rudder interfaces come up at the same time and an election

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is held.

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So here's what a fool.

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Show IP OSPF Interface Gigabit Fast Ethernet zero zero.

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We can see that this router has a property of zero.

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Its state is d or other neighbor.

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Relationships are being established.

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So show ip ospf neighbor.

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We have a serial interface which we can ignore for this discussion.

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That's this interface here.

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We are concentrating on the Ethernet segment so we can see the.

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Priorities of the neighbors report a one has a party of 100.

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It's become the designated writer.

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Rather two has a party of one.

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It's become a D or other.

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Rather three has a party of 20.

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It's become the BTR.

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And once again.

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On the local router first Ethernet zero zero to become a D or other.

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So the first criteria for determining who the designated writer is on a segment is priority.

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Highest priority wins.

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Default priority is one.

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When the priority is set to zero, the writer will not become a designated writer or a backup designated

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writer.

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Hope you enjoyed this video.

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If you did, please like it and please subscribe to my YouTube channel.

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I wish you all the very best.