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January 8th, 2015 in Lab Sim, LabSim Go to comments


OSPF is configured on routers Amani and Lynaic. Amani’s S0/0 interface and Lynaic’s S0/1 interface are in Area 0. Lynaic’s Loopback0 interface is in Area 2.


Your task is to configure the following:

Portland’s S0/0 interface in Area 1
Amani’s S0/1 interface in Area 1
Use the appropriate mask such that ONLY Portland’s S0/0 and Amnani’s S0/1 could be in Area 1.
Area 1 should not receive any external or inter-area routes (except the default route).

Answer and Explanation:

First, we configure Portland’s S0/0 interface so that it belongs to Area 1. So, we have to find out which sub-network the IP address (the IP of interface S0/0 of Portland) belongs to. This address belongs to a subnetwork which has:

Increment: 4 (/30 = or 1111 1111.1111 1111.1111 1111.1111 1100)
Network address: (because 4 = 4 * 1 and 4 < 5)
Broadcast address: (because 7 = 4 + 4 – 1) (It is not necessary to find out the broadcast address but we should know it)

The question requires that only Portland’s S0/0 and Amani’s S0/1 could be in Area 1, therefore we must use a wildcard of (this wildcard is equivalent with a subnet mask of /30) so that there are only 2 IP addresses can participate in area 1 (they are & The full command we use here is network area 1

The question also requires that “Area 1 should not receive any external or inter-area routes (except the default route)”. Recall that if we don’t want the router to receive external routes, we have to stop LSA Type 5. And if we don’t want to receive inter-area routes, we have to stop LSA Type 3 and Type 4. Therefore we have to configure area 1 as a totally stubby area. For your information, here is the definition of a totally stubby area:

Totally stubb area – This area does not accept summary LSAs from other areas (types 3 or 4) or external summary LSAs (Type 5). Types 3,4 and 5 LSAs are replaced by the Area Border Router(ABR) with a default router. Totally stubby areas protect internal routers by minimizing the routing table and summarizing everything outside the area with a default route.” (CCNP BSCI Official Exam Certification Guide, Fourth Edition)

In conclusion, we have to configure area 1 as a totally stubby area. We do that by configuring Portland as stub and configuring Amani (ABR router) as a stub + “no-summary”suffix.

+ Configure Portland router as a stub:

Portland#configure terminal
Portland(config)#router ospf 1

Allow network to join Area 1, notice that you have to convert subnet mask into wildcard mask:

Portland(config-router)#network area 1

Configure Portland as a stub:

Portland(config-router)#area 1 stub

Portland#copy running-config startup-config

+ Configure Amani router as a “totally stub”:

Amani#configure terminal
Amani(config)#router ospf 1
Amani(config-router)#network area 1

Make area 1 become a totally stubby area, notice that we can only use this command on ABR router:

Amani(config-router)#area 1 stub no-summary

Amani#copy running-config startup-config

Note: Make sure to check the OSPF process ID before typing your configuration. Maybe it is not OSPF process 1 like the configuration above.


Other lab-sims on this site:

EIGRP Stub Sim

EIGRP OSPF Redistribution Sim

IPv6 OSPF Virtual Link Sim

EIGRP Simlet
Policy Based Routing Sim


Comment pages
1 2 3 4 84
  1. Team_Stark
    December 9th, 2018





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    December 10th, 2018

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    December 11th, 2018

    @route rider

    NO.53 Which two statements about AAA with the local database are true?(Choose two

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    It supports a limited number of usemames and passwords Accounting is not supported locally

    1- It supports a limited number of usemames and passwords
    2- Accounting is not supported locally

  4. Laonzena
    December 12th, 2018

    is this a simulation question?(like in CCNA)
    How can i practice this sim? GNS3?

  5. Dany1
    January 15th, 2019

    If you pay for premium member, digitaltut have a simulator where you can practice.
    Is possible also in GNS3 and for this particular scenario possible to work in packet tracer.

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  10. McFaber
    March 2nd, 2019

    Hello Guys about the OSPF Sim I think the most specific wildcard mask we should use since the question ask “ONLY Portland’s S0/0 and Amnani’s S0/1 could be in Area 1” so why /30 on OSPF? I think it should be /32, then something like: network area 1 and so on. It’s generally recommanded to use the most specific widlcard subnet. What do you think about?

  11. someone
    March 6th, 2019

    You are right. It could be done on that way and it is better to do it like that. Well done!

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    March 8th, 2019

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  13. Area
    March 19th, 2019

    When I attempted in my first test, it mentioned using area 5.

  14. Khan
    March 30th, 2019

    Passed ccnp route today. got 3 labs.
    1. tshoot OSPF
    2. PBR
    3. Redistribution

    100% same as 9tut. in redistribution the eigrp 90 105 command is needed because there is a fast ethernet conneciton

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    March 30th, 2019

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  16. marnp
    March 31st, 2019

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    April 1st, 2019

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    April 1st, 2019

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    April 1st, 2019

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  22. ay esm
    April 30th, 2019

    what if i configured Portland router area type as stub-no summary like the ABR (Amani) would it be wrong configuration ?

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    June 19th, 2019

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    July 17th, 2019

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    July 18th, 2019


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  28. Anonymous
    July 24th, 2019

    Congratulation dude, what u mean about ospf verification , did you mean ospfv3 lab or ospf sim?

  29. suntzu
    July 26th, 2019

    He means the bullshit OSPF evaluation sim. Cisco has included that bullshit and when you look at it, the serial links are swapped. It looks from the drawing that R1-R3 and R2-R3 are on certain ports but when you look at the serial interfaces in the router console, they are actually swapped…I’m sick of this trickery crap that Cisco is trying to pull.

  30. Anonymous
    July 26th, 2019


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    On the OSPF evaluation sim, make sure to look at the actual interfaces and not just the drawing. Some tests have the interfaces swapped between R1, R2 and the ABR R3.

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    August 16th, 2019

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