You are configuring OSPFv2 on a router in your network. The router has not been assigned a router ID manually. It has three active physical interfaces with IP addresses 192.168.1.1, 192.168.2.1, and 10.0.0.1. It also has one loopback interface with IP address 172.16.0.1. What IP address will OSPFv2 select as the router ID in this case?
OSPFv2 selects the router ID in the following order: First, it uses the manually configured router ID if one is set. If not, it chooses the highest IP address on any active loopback interfaces. If no loopback interfaces are present, it selects the highest IP address among active physical interfaces. In this scenario, since there is a loopback interface with IP address 172.16.0.1, OSPFv2 will select this as the router ID. Even though the physical interfaces have higher IP addresses numerically (e.g., 192.168.2.1), the presence of a loopback interface takes precedence.
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Cisco CCNA 200-301
IP Connectivity
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