Where are the Designated Router in this picture?

Question

I have the following network diagram and I want to know which interface on every router is the Designated Router?

I got the message that Router1 on interface 192.168.4.1 is the Designated Router but I do not know why? Router1 does not have any Router-Id and Loopback-IP, so how can it be that this interface becomes Designated Router? Compared to Router 2, which has a Router-Id and a Loopback - IP, its interface with the IP address 192.168.4.2 must become in my understanding the Designated Router.

I know the election has the following priority:

1) Highest priority 2) Router-Id 3) Loopback - IP 4) Interface - IP

Maybe, someone can tell me what I am doing wrong here?

Thanks in advance.

Answer 1

I will answer my question :)

Designated Router will be chosen the following way:

1) The highest Priority counts 2) The highest Router-Id 3) The highest Loopback - IP 4) The highest Interface - IP

Priority defaults to 1.

So, Router - Id counts in the beginning. If Router - Id is missing and all the others, too, the highest Interface - Ip will be taken as the highest Router - Id.

In my example, let us take the Router 1:

It has neither a Router - ID nor a Loopback - Ip. So, its highest Interface will be taken as the Router - Id and this one will be compared with Router 0s Router-Id. Router1: 192.168.1.7 > Router0: 3.3.3.3