Cisco - OSPF

Single Area

interface loopback 0

ip address 1.1.1.1 255.255.255.255 

interface GigabitEthernet1/0/1
ip address 10.1.20.1 255.255.255.0

router ospf 1
log-adjacency-changes
redistribute eigrp 100 subnets
network 1.1.1.1 0.0.0.0 area 0
network 10.1.20.2 0.0.0.0 area 0

General Information - show ip ospf general

Verify if OSPF is enabled, router ID, Distance, LSA import Type packest

Area information - show ip ospf area

Shows information for the specified area. Verify Area ID is correct

External link state information - show ip ospf external-link-state

Verify the Link Stae Id shows correct destination of external route and router ID that originated the external LSA

Interface information - show ip ospf interface

Verify IP Address, Status, Area ID, and State (DR, BDR, etc)

Link state information - show ip ospf link-state

Verifies LSA Type, Link State ID, and Router ID for all Areas

Neighbor information - show ip ospf neighbor

Verify neighbor router ID, IP Address, neighbor interface state (DR, BDR, null), and State (should be FULL)

Route information - show ip ospf

This has a lot of information, most of it already covered in other show commands