What command shows the FIB router information?

The command that shows the Forwarding Information Base (FIB) router information is indeed an important aspect of understanding how routing operates within the network. The FIB contains the information that's used by the router to forward packets. This command provides insights into the current state of the kernel's routing table and normally includes specific details about the routes that have been learned, maintained, and their respective metrics.

When you run the command that retrieves the kernel information, it displays not just the routing information, but also how the system's kernel handles the forwarding process. It is particularly useful for diagnosing routing issues because the FIB reflects the active set of routes that the router will utilize for forwarding decisions.

In contrast, other commands listed do not specifically provide the FIB information. Instead, they have different focuses such as detailed routing tables, kernel states, or general routing status, which do not directly relate to the forwarding processes driven by the FIB. This specificity makes the command that shows the FIB information integral for administrators who are troubleshooting or analyzing routing performance since it directly impacts packet delivery within the network.