How to Configure OSPF Totally Stub Area

OSPF Stub Areas

1. Stub Area - No Type 4 ASBR or 5 AS-external LSAs allowed.
2. Totally Stub Area - No Type 3 Summary, 4 ASBR or 5 External LSAs allowed except the default summary route.
3. NSSA (Not-So-Stubby Area) - No Type 5 AS-external LSAs allowed,
but Type 7 LSAs that convert to Type 5 at the NSSA ABR can traverse.
4. NSSA Totally Stub - No Type 3 Summary LSA, 4 ASBR or 5 External LSAs except the default summary route,
but Type 7 LSAs that convert to Type 5 at the NSSA ABR are allowed.

Totally Stub Areas:
These areas do not allow routes other than intra-area and the default routes to be propagated within the area.
The ABR injects a default route into the area and all the routers belonging to this area use the default route to send any traffic outside the area.

How to Configure OSPF Totally Stub Area:

CONFIGURE:
R1:
conf t
router ospf 1
network 10.10.12.0 0.0.0.255 area 0
redistribute connected subnets
end
wr

R2:
conf t
router ospf 1
network 10.10.12.0 0.0.0.255 area 0
network 10.10.23.0 0.0.0.255 area 1
end
wr

R3:
conf t
router ospf 1
network 10.10.23.0 0.0.0.255 area 1
end
wr

Convert Area 1 (Stub Area) into a Totally Stub Area:
R2:
conf t
router ospf 1
area 1 stub no-summary
end
wr

R3:
conf t
router ospf 1
area 1 stub
end
wr

VERIFY:
show ip ospf neighbor
show ip route ospf
show ip ospf database
clear ip ospf process

REFERENCES:
What Are OSPF Areas and Virtual Links?

Types of OSPF Areas

OSPF Database Explanation Guide

#cisco #ccna #ccnp #ccie

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