This is one of multiple videos discussing OSPF designated rider and backup designated rider elections.
Have a look at this segment connected to this layer to switch, which Rada will become the designated
rider.
Will it be rider one with this IP address ten 111.
Property 100.
Or will it be rather to using the default priority and IP address ten 112.
Or will it be right of three with a priority of 20?
IP addresses ten 113.
Or will it be rather fall with a party of zero?
IP Address ten 114 Which writer will become the designated writer on this segment?
What do you think?
So let's see if you can answer some additional questions.
What is the default priority in OSPF?
What happens when a router has a priority of zero?
Is it highest or lowest priority that makes a router win an election?
Is priority even used?
Is it highest or lowest IP address?
In this topology.
I've shut down all the interfaces on the switch.
And what I'll do now is enable them so that all rudder interfaces come up at the same time and an election
is held.
So here's what a fool.
Show IP OSPF Interface Gigabit Fast Ethernet zero zero.
We can see that this router has a property of zero.
Its state is d or other neighbor.
Relationships are being established.
So show ip ospf neighbor.
We have a serial interface which we can ignore for this discussion.
That's this interface here.
We are concentrating on the Ethernet segment so we can see the.
Priorities of the neighbors report a one has a party of 100.
It's become the designated writer.
Rather two has a party of one.
It's become a D or other.
Rather three has a party of 20.
It's become the BTR.
And once again.
On the local router first Ethernet zero zero to become a D or other.
So the first criteria for determining who the designated writer is on a segment is priority.
Highest priority wins.
Default priority is one.
When the priority is set to zero, the writer will not become a designated writer or a backup designated
writer.
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