24 Responses to “Core and 2 distribution blocks with L3 and L2 access switches”

1. GNS3 Lab: Core and 2 distribution blocks with L3 and L2 access switches « Pierky’s Blog
   March 7th, 2009 at 2:23 pm

   [...] Open this lab on GNS3-Labs.com [...]

2. Petchged
   March 15th, 2009 at 3:32 am

   Thank you so much sir. this is useful

3. guled
   March 30th, 2009 at 7:43 pm

   thanks so much mate. it’s really useful for me.
   thanks

4. Naif
   April 3rd, 2009 at 5:25 pm

   Thanks >>>

5. Yat
   April 16th, 2009 at 8:02 pm

   Thank you so much. this really useful in understanding cisco design architecture and the configuration which goes into it.

   Regards

6. Jonathan
   April 17th, 2009 at 4:52 pm

   I couldn’t open the lab. It looks like it’s going to open…”starting hypervisors”…then I get a dynamips error saying “could not connect to server”
   Thoughts?

7. pierky
   April 18th, 2009 at 5:03 am

   Umh… you can try to edit the .net file with Notepad and replace “127.0.0.1″ occurrencies with “localhost”.

8. sanjay
   April 21st, 2009 at 5:29 am

   Hi pierky

   I am trying to run PIX firewall on GNS but not able to do that , reason being i doesn’t have PIX IOS , can u pls help me ..

9. pierky
   April 21st, 2009 at 5:37 am

   Sorry Sanjay, I can’t help you.

10. LBSources
    April 22nd, 2009 at 8:06 am

    @sanjay http://www.blindhog.net/gns3-how-to-find-pix-images-pix-serial-numbers-and-ios-images-using-google/

    Good luck ..

11. Bandar
    April 24th, 2009 at 7:11 am

    Hi all ,
    I am looking for a lab for ISIS over DMVPN, any one can help.

12. LBSources
    April 24th, 2009 at 7:27 am

    @Bandar .. All I have at the moment is http://www.gns3-labs.com/2008/12/01/gns3-topology-bsci-eigrp-isis-redistribution-lab/

13. pierky
    April 24th, 2009 at 3:06 pm

    @Bandar

    Hi, I think you can’t use ISIS over DMVPN. ISIS neighbors need to be Layer-2 (datalink) adjacent, and DMVPN peers are not. If you have a ISIS backbone and DMVPN spokes I think you should redistributes spokes routes into ISIS using another protocol, such as OSPF or EIGRP.

14. Bandar
    April 25th, 2009 at 3:53 am

    Thank you all for your reply.
    I tried ISIS over normal GRE tunnel and it work fine without any problem.
    With DMVPN i received below error.

    ISIS-Adj: Encapsulation failed for L2 LAN IIH on Tunnel0

15. pierky
    April 26th, 2009 at 7:55 am

    Hi Bandar,

    as far as I know IS-IS works fine in broadcast and point-to-point networks only; other network types have to be rearranged to one of these two topologies, or need some kind of “emulation” such as “frame-relay map clns 123 broadcast”.

    Standard tunnels are point-to-point links, and GRE grants ISIS PDUs encapsulation as it would be on a data-link frame. No problems for ISIS here.

    DMPVN networks are NBMA. If you setup spokes with a ptp tunnel, using DMVPN just to simplify hub configuration, you have them sending ISIS Hello, but hub shows you errors:

    ISIS-Adj: Rec serial IIH from *Tunnel* (Tunnel0), cir type L1L2, cir id 01, length 1513
    ISIS-Adj: Point-to-point IIH received on multi-point interface: ignored IIH

    On the hub side, you have encapsulation error for outgoing Hellos:

    ISIS-Adj: Encapsulation failed for L1 LAN IIH on Tunnel0

    You have the same error if you setup spokes with “tunnel mode gre multipoint”.

    As I see it, with multipoint networks IOS can’t know what to put on top of outgoing ISIS PDUs. I don’t know about workarounds to make DMVPNs seem like broadcast or ptp networks.

16. Spyros
    April 26th, 2009 at 9:13 am

    Hi guys,

    I am ready to build a really powerful pc and to be honest just to run GNS3 as I am ready to study my CCIE.

    I know that GNS3 doesn’t support IOS for layer 3 switches apart of the 3xxx router with the problem module.

    So … what my plan is to buy 4 layer 3 switches plug eachone in a nic card on my pc and create trunk ports with virtual routers.

    So my main query is if I can use physical layer3 switch and create a trunk port with a virtual router via my desktops’s nic card?

    Is that possible guys?

    I have searched the web and study the gns3 documantation but I couldn’t find anything.

    Any idea guys I will appreciate for your help.

    Thanks,
    Spyros

17. pierky
    April 26th, 2009 at 9:37 am

    Hi Spyros,

    I found this: http://wiki.gns3.net/index.php/Documentation

    The main question seems to be: do GNS3 clouds support 802.1q trunking?

    At that URL they say:

    You can also connect a switchport to the “real world” by connecting the switch to a “Cloud” device. Here we are connecting a trunk port (dotq1 encapsulation) with a native vlan of 1 to the host’s eth1, or Windows network device using the NIO_gen_eth Winpcap NIO (see Communicating with Real Networks section). If this host interface is connected to a real switch that is configured for trunking, you can now easily connect any router instance to any VLAN you wish.

    So, it seems it does support trunking on clouds.

    You can look here too: http://www.sadikhov.com/forum/lofiversion/index.php?t155313.html

    Have fun!

    Bye,
    Pierky

18. LBSources
    April 26th, 2009 at 1:38 pm

    @Spyros Yes this is possible and works just as you would expect. I did this when testing using a virtual (GNS3) router as my home router with real traffic flowing. Of course now you’re complicating your topology between the physical and virtual, but if you don’t get confused, you should be able to do it.

    Just get yourself some dual/quad cards from ebay or surplus company.

    Good luck on the IE exam!

    -Lenny

19. Spyros
    April 26th, 2009 at 2:52 pm

    Thanks you guys,

    definetely you will see me here chasing you ….:)

    I am surprized that there are so many good guys around that are willing to help.

    Once more.. Thank you

20. hamid
    July 8th, 2009 at 4:10 am

    i run this lab but get this error
    nonexistent device c2
    please help me

21. wassim
    September 6th, 2009 at 5:44 am

    great website. I’ve already added a link to it on my blog.
    keep up the good work man !

22. kamlesh
    March 3rd, 2010 at 1:30 pm

    Hi,

    I am trying to connect Pix to Ethernet Swtich, but it’s not.

    Please suggest, how to connect.

    Error: can’t connect these devices.

23. LBSources
    March 3rd, 2010 at 11:20 pm

    @kamlesh Upgrade to the latest version and you should be OK..

    http://www.gns3-labs.com/2010/02/28/gns3-announcement-official-release-of-gns3-07-stable/

24. kafee
    February 15th, 2011 at 2:47 am

    nonexistent device C2

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