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Refer to the exhibit. The multi-access network has been configured with OSPF in area 0. The router IDs R2 and R3 routers are manually set because R3 must be DR and R2 must be BDR. Router R3 and R2s interface fast Ethernet 0/0 values has been left default, and Router R1s interface fast Ethernet 0/0 configuration is displayed in the picture. For some reason R1 keeps being the DR. What can be the source of the problem on R1?
The IP address belongs to a different subnet.
Speed and duplex must be manually set.
The ip ospf priority of R1 is higher than R2 and R3.
The R1s Router ID is lower than R2 and R3.
The interface is administratively shut down.
To form Designated Router DR and Backup Designated Router for an OSPF network, the first value considered is the ospf interface priority. The default priority is 1 and if a priority is configured higher than that (in this case is set by 2) the router will be DR. If it is a tie, the highest Router ID will be considered as the DR, (in this case R3). A router with priority configured as 0 cannot become either DR or BDR. For more information refer to: http://www.cisco.com/c/en/us/td/docs/ios/122/iproute/command/reference/fiprrpr/1rfospf.html
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