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Lab
5.4.5 Multi-Area
OSPF Routing -- Stub and Totally Stubby Areas
Objectives:
- Configure OSPF Area 1 as Stub and
Totally Stubby
Scenario:
The BubbaGump ISP wants to limit the
number of routes that enter Area 1 so you have been called to setup
the area as STUB.
Tasks:
From the "Router D"
console
NOTE: Ping all interfaces before
beginning.
- Enter
show ip ospf neighbor
What is the neighbor state?

- To configure an area OSPF as stub
issue the following commands:
router-d(config)#router ospf 1
router-d(config-router)#area 1 stub
router-d(config-router)#control Z
- Enter
show ip ospf neighbor
What is the neighbor state now? Why?

- Enter
show ip route
What routes are now available?

From the "Router C"
console
- Enter
show ip route and show ip ospf
neighbor. Report your findings below:



- To configure this OSPF router as a
stub issue the following commands:
router-c(config)#router osfp 1
router-c(config-router)#area 1 stub
router-c(config-router)#control Z
Enter show ip route
and show ip ospf
neighbor
What changed? Why?

From the "Router B"
console
- Enter show ip route
and show ip ospf
neighbor. Report your findings below:



- To configure area 1 only as a stub
issue the following commands:
router-b(config)#router osfp 1
router-b(config-router)#area 1 stub
router-b(config-router)#control Z
- Enter show ip route
and show ip ospf
neighbor
What changed? Why?

From the "Router
D"console
- Enter
show ip route
Is there a gateway of last resort
set? Why?

What routes are listed?

Scenario:
You have now been instructed by the
BubbaGump ISP to make area 1 a totally stub network.
From the "Router B"
console
- To configure this OSPF area as
totally stub issue the following commands:
router-b(config)#router osfp 1
router-b(config-router)#no area 1 stub
router-b(config-router)#area 1 stub no-summary
router-b(config-router)#area 1 default-cost 10
router-b(config-router)#control Z
From the "Router D"
console
- Enter
show ip ospf border-router and
show ip route
What routes are now listed?

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