OSPF – NotesMandatory Commands

router ospf 1 log-adjacency-changes network 1.1.1.1 0.0.0.0 area 1 network 10.1.12.0 0.0.0.255 area 0 network 172.1.13.0 0.0.0.255 area 0

Optional Commands

Router ospf 1Router-id 1.1.1.1 (specify ospf router id)

int fa0/0ip ospf priority 0 (used to specify DR/BDR – highest priority wins, 0 cannot be a DR/BDR.)

router ospf 1area 34 virtual-link 33.33.33.33 - remote area router id or loop 0

router ospf 1redistribute connected <subnets> - use subnets or only classful networks will be redistributed.Router ospf 1Area 34 stub – create a stub area

Show ip protocols – displays all protocols running on the router.

Show ip ospf database – to show contents of database.

show ip ospf neighbour <detail> – neighbour relationships

show ip ospf interface fa0/0 – use the specific interface

show ip ospf interface brief – to show a brief of all interfaces

show ip route ospf – filters only ospf routes

show ip ospf virtual-link – check virtual links

show ip ospf – displays basic info. about OSPF routing processes.

show ip ospf border-routers – displays border and boundary router information.

Clear ip ospf processes – clear ip route table

Clear ip route * - clears entire routing table

Clear ip ospf counters – resets ospf counters.

Debug ip ospf events – displays all ospf events.

Debug ip ospf adjacency – displays ospf states & DR/BDR election between adjacent routers.

Debug ip ospf packets – displays ospf packets.

Debug ip ospf hello -