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I just wanted to clear out that the DR is elected based on highest ROUTER ID not highest loopback address. In this case the router has the highest router ID is Rtr2 not Rtr3.
I refer to section -3.4.4 'Selecting the DR and BDR' - CISCO Network Academy Program BCSI v5.0
To elect a DR and BDR, the routers view the OSPF priority value of the other routers during the hello packet exchange process and then use the following conditions to determine which router to select:
· The router with the highest priority value is the DR.
· The router with the second-highest priority value is the BDR.
· The default for the priority is 1. In the case of a tie, the router ID is used. The router with the highest router ID becomes the DR. The router with the second-highest router ID becomes the BDR.
Note: The highest IP address on an active interface is normally used as the router ID. However, you can override this selection by configuring an IP address on a loopback interface or using the router-id router configuration command
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