BSCI - OSPF - Area Types - Totally Stubby Area (Dude!)

Totally Stubby Area - Cisco Proprietary, reduces the Routing Table further.

• Blocks external Type5 LSA's, Summary Type3 LSA's, and ASBR Type4 LSA's
• Totally Stubby Area only recognises intra-area routes and the default route 0.0.0.0
• ABR's inject the default route in to the Totally Stubby Area
• Each area router picks the closest ABR as its DFG

Configure a Totally Stubby Area

1) Configure OSPF as usual

2) Define the area to be Totally Stubby, as a Stub on all routers in the area, using the cmd:

R4(config)#router ospf 1

R4(config-router)#area 4 stub

3) On the ABR configure Area 3 to be Totally Stubby:

R5(config)#router ospf 1

R5(config-router)#area 4 stub no-summary

On the ABR the Routing Table will not change.

On the Totally Stubby router the routing table should only see routes in it's area and a default route to the ABR.