Useful commands to verify OSPF include the following:

Figures 1 to 5 display the corresponding output each verification command entered on R1.

Use the Syntax Checker in Figure 6 to verify the neighbor adjacency, vital OSPF configuration information, and to display a summary of OSPF enabled interfaces on R2.

Use the Syntax Checker in Figure 7 to verify the neighbor adjacency, vital OSPF configuration information, and to display a summary of OSPF enabled interfaces on R3.