Home > IPv6 OSPF Sim


September 14th, 2017 Go to comments


All routers are running IPv6 OSPF with process ID 100. The loopback0 IPv4 address is the OSPF router ID of each router.

On HQ router, a provider link is provided and you have to configure an IPv6 default route on HQ and make sure this route is advertised in IPv6 OSPF process. Also troubleshoot why HQ is not forming IPv6 OSPF neighbor with BR.


1. Configure IPv6 default route on HQ router with default gateway of 2001:DB8:B:B1B2::1
2. Verify by pinging provider test IPv6 address 2001:DB8:0:1111::1 after configuring default route on HQ
3. Make sure that the default route is advertised in IPv6 OSPF router HQ. This default route should be advertised only when HQ has a default route in its routing table
4. Router HQ is not forming IPv6 OSPF neighbor with BR. Troubleshoot and solve the problem

Special Note: To gain the maximum number of points, you must complete the necessary configurations and fix IPv6 OSPF neighbor issue with router BR. IPv6 OSPFv3 must be configured without using address families. Do not change the IPv6 OSPF process ID.


1. Configure IPv6 default route on HQ router with default gateway of 2001:DB8:B:B1B2::1:

HQ(config)#ipv6 unicast-routing
HQ(config)#ipv6 route ::/0 2001:DB8:B:B1B2::1

First we have to enable IPv6 routing with the “ipv6 unicast-routing” command then we configure a default route on HQ router.

2. Verify by pinging provider test IPv6 address 2001:DB8:0:1111::1 after configuring default route on HQ:

HQ#ping ipv6 2001:DB8:0:1111::1

Issue the ping test to see if the default route works. The ping must be successful.

3. Make sure that the default route is advertised in IPv6 OSPF router HQ. This default route should be advertised only when HQ has a default route in its routing table:

HQ(config)# ipv6 router ospf 100
HQ(config-rtr)#default-information originate

The command “default-information originate” will generate a default route and send to all other routers in the OSPF domain, provided that the local router has a default route configured.

4. Router HQ is not forming IPv6 OSPF neighbor with BR. Troubleshoot and solve the problem

Maybe interface S1/0 of HQ was not enabled with IPv6 OSPF (verify by the “show run” or “show ipv6 ospf interface” command) so we have to enable it.

HQ(config)#interface s1/0
HQ(config-if)#ipv6 ospf 100 area 0

After configuration use the “show ipv6 ospf neighbor” on HQ to see if BR is listed in the output.

Comments (10) Comments
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  1. 9tut
    May 26th, 2018

    @dudest, @CyrusKain: The “ipv6 unicast-routing” should not appear in the config, so we have to type it. Thanks for your detection, we have just fixed it!

  2. Sinix
    May 28th, 2018

    Fellas, I can´t find the file sim to practice, could someone point it out, pls? There is no hint to its location. It´s not in F.A.Q. list.

  3. Fahad
    May 28th, 2018

    Hi how are you every body any one can send me this topology/lab in the form of GNS3 or packet tracer kindly email me my ccna exam in next week. My email address is {email not allowed}

    thank you..and I hope anyone can send me

  4. hamza
    May 31st, 2018

    In Step 3.
    Make sure that the default route is advertised in IPv6 OSPF router HQ. This default route should be advertised only when HQ has a default route in its routing table:

    Can i use
    HQ(config)#router ospf 100
    HQ(config-if)#default-information originate

    so it is the right configuration or not and also my lab is completed or not ?

  5. CyrusKain
    June 6th, 2018


    For some reason OSPF is gone from the sim now. A show ip protocols returns the routing protocol as application and a show run has no references or listings of OSPF. However, you’re asked to enter ipv6 ospf router 100 to do a default-information originate command, except now we don’t know what the ospf process ID is because it’s no longer running. About a week or so ago this wasn’t the case; something changed between now and then.

  6. 9tut
    June 6th, 2018

    @CyrusKain: Oh, OSPF was removed because of missing “ipv6 unicast-routing” command. We are still not sure how this sim is showed in the exam. We will update this sim soon when we have enough information about it.

  7. sameer
    June 7th, 2018

    today i pass my CCNA exame.. this lab is in the exame.

    thank u 9tut

  8. Sinix
    June 11th, 2018


    Could you kindly share and post the file on OP, please? It would be very useful.

  9. Antoine
    June 14th, 2018

    I had a modification of this sim where:

    – “ipv6 unicast-routing” command WAS in the running-config so no need to configure.

    – The neighborship was not formed because despite the fact that OSPFv3 was configured under the interface, the area was different than 0. Thus you had to remove it (no ipv6 ospf 100 area X), and configure the proper command (ipv6 ospf 100 area 0).

  10. newbie
    June 23rd, 2018

    All good here, but seems that sometimes it works sometimes not, even if at the end it says everything is configured correct the ping does not work .

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