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EIGRP Beginner

Written by Rene Molenaar on . Posted in EIGRP

Scenario:

Company XYZ decided to upgrade their network to Cisco only equipment and implement the EIGRP routing protocol. It's up to you to get the job done!

Goal:

  • Configure all IP addresses as specified in the topology.
  • Create 3 loopback interfaces:
    Router X: 172.16.1.0 /24
    Router Y: 172.16.2.0 /24
    Router Z: 172.16.3.0 /24
  • Configure EIGRP on all routers, use AS number 100. Achieve full connectivity
  • You notice that when you start a ping from router Y's loopback to the loopback of router X that this is not possible, you need to fix the problem.
  • Change the bandwidth so traffic from router Z to router Y's loopback interface uses the link between X and Z.
  • Change the EIGRP configuration on all routers so load and reliability are also used as metrics.
  • RouterX: create a summary towards Router Y and Z for the 172.16.1.0 /24 network. It should appear as 172.16.0.0 /16.
  • Configure EIGRP authentication on all routers:
    Key-Chain: XYZ
    Key-ID: 1
    Password: vault
  • Create key-ID 2 in the XYZ key-chain and configure a accept and send-lifetime.
    Key-ID 1: valid from 1 June 2010 till 14 June 2010.
    Key-ID 2: valid from 14 June 2010 till 28 June 2010.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

EIGRP Beginnet Network Topology

Video Solution:

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Comments (27)

  • avatar
    karl ardy

    looking for good gns3 lab to improve my performance

    thanks,
    karl

  • avatar
    ReneMolenaar

    well, what kind of labs are you looking for?

  • avatar
    raffaelbh

    Change the bandwidth so traffic from router Z to router Y uses the link between X and Z.

    C 172.16.3.0/24 is directly connected, Loopback0
    C 192.168.23.0/24 is directly connected, FastEthernet1/0


    Change only the bandwidth will affect nothing because this routes have lower costs.

  • avatar
    ReneMolenaar

    The Metric EIGRP uses is based on bandwidth and delay by default. By playing around with the bandwidth you can influence routing. Try to reach the loopback of router Y from router Z and influence this.

    Of course the directly connected networks you can't change since it has an administrative distance of 0.

    Good luck :)

  • avatar
    tushar18

    not getting this point

    Quote:
    Change the bandwidth so traffic from router Z to router Y's loopback interface uses the link between X and Z.

    How to execute command for this ? :'(

  • avatar
    Suraj

    Fix not on common subnet, EIGRP...

    http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a0080093f09.shtml

  • avatar
    ReneMolenaar

    Bandwidth can be configured on the interface. Not on common subnet errors you will see when you have 2 routers not in the same subnet ;D

  • avatar
    rajchamat


    @Rene ... thanks a lot .. have successfully completed lab.

    Cheers!!

    Thanks,
    Rajdeep

  • avatar
    NitinPatil_2011

    How to do this ?
    Change the EIGRP configuration on all routers so load and reliability are also used as metrics.

  • avatar
    rhass

    unable to load labs into gns3 receive error below. Please help thanks

    203-Bad number of parameters (1 with min/max=2/2)

    *** Error: errors during loading of the topology file, please correct them
    Warning: using localhost in your topology file is not recommended
    Local working directory /tmp cannot be found for hypervisor localhost:7200, use working directory C:Usersjamesr01DocumentsGNS3 projets instead
    Local IOS image /Data/IOS Images/c3640-jk9s-mz.124-16.bin cannot be found for hypervisor localhost:7200, use image C:Usersjamesr01Downloadsc3640-ik9o3s-mz.124-25b.bin instead
    *** Warning: received dynamips server error:
    203-Bad number of parameters (1 with min/max=2/2)
    *** Warning: received dynamips server error:
    203-Bad number of parameters (1 with min/max=2/2)
    *** Warning: received dynamips server error:
    203-Bad number of parameters (1 with min/max=2/2)

    *** Error: errors during loading of the topology file, please correct them
    Warning: using localhost in your topology file is not recommended
    Local working directory /tmp cannot be found for hypervisor localhost:7200, use working directory C:Usersjamesr01DocumentsGNS3 projets instead
    Local IOS image /Data/IOS Images/c3640-jk9s-mz.124-16.bin cannot be found for hypervisor localhost:7200, use image C:Usersjamesr01Downloadsc3640-ik9o3s-mz.124-25b.bin instead
    *** Warning: received dynamips server error:
    203-Bad number of parameters (1 with min/max=2/2)
    *** Warning: received dynamips server error:
    203-Bad number of parameters (1 with min/max=2/2)
    *** Warning: received dynamips server error:
    203-Bad number of parameters (1 with min/max=2/2)

    *** Error: errors during loading of the topology file, please correct

  • avatar
    dondave69

    Good work for all of us to see.Keep it up Bro.Can you direct me the link of video for Beginner EIGRP? Thanks.

  • avatar
    ReneMolenaar

    Hello David,

    I'm silly that I missed this one, will record it ASAP and put it online.

    Rene

  • avatar
    dondave69

    Did AS 10 for all 3 router and advertise eigrp on 3 routers.

    All routers where able to ping themselves.Can I see any debug output?


    sample config of R2:

    !
    hostname R2
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    memory-size iomem 5
    !
    !
    ip cef
    !
    interface Loopback0
    ip address 172.16.2.1 255.255.255.0
    !
    interface FastEthernet0/0
    ip address 192.168.12.2 255.255.255.0
    duplex auto
    speed auto
    !
    interface FastEthernet1/0
    ip address 192.168.23.1 255.255.255.0
    duplex auto
    speed auto
    !
    router eigrp 10
    network 172.16.0.0
    network 192.168.12.0
    network 192.168.23.0
    auto-summary
    !
    ip http server
    no ip http secure-server
    !
    !
    control-plane

    !
    line con 0
    logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end

  • avatar
    hameidi

    dear:

    i am big fun of your work i would be glad if u male solution video for all EIGRP,OSPF, an routing IGP

  • avatar
    tohritz

    Hi,

    Where can i watch the video for this lab?

  • avatar
    tohritz

    guys, this is not directly related to the topic..but had a little problem lately on how to save my gns3 labs then load it..but i had it sorted out...just curious on the working folder that is created after you save a project...what is that folder for? when opening up a project, we just need to import the configs right? and has nothing to do with the working folder? what are the uses of the files in the working folder?

  • avatar
    ReneMolenaar

    Hello Rito,

    I haven't recorded the solution yet. What part are you stuck on?

    You only need the the topology .NET file and the configs. You don't need the working directory. I'm not 100% sure what it is used for but I believe to save your "disk" files and such files. Just forget about the "working" folder :D

  • avatar
    tohritz

    Hi Rene,
    I have a couple of questions here. :)

    -when setting up loopback addresses on the 3 routers, are the commands:
    ip address 172.16.x.0 255.255.255.0 on each router or do you assign a host? I'm confused because my configurations were 172.16.x.0 255.255.255.0, but when i checked the attached zip file and run the configurations, the loopback addresses were 172.16.x.x with /24 mask


    "You notice that when you start a ping from router Y's loopback to the loopback of router X that this is not possible, you need to fix the problem."
    -Is this resolved by changing the mask of the 3 loopbacks to /32 (i was able to ping all the loopback addresses, with my 3 loopbacks set to 172.16.x.0 /24 originally, by changing the mask to /32)

    "Change the bandwidth so traffic from router Z to router Y's loopback interface uses the link between X and Z."
    -I tried increasing the bandwidth of f0/0 on router Z but the traffic still goes through f1/0 on router Z.

    "Change the EIGRP configuration on all routers so load and reliability are also used as metrics."
    -Can you show how is this done?

  • avatar
    ReneMolenaar

    Hi Rito,

    Quote:
    -when setting up loopback addresses on the 3 routers, are the commands:
    ip address 172.16.x.0 255.255.255.0 on each router or do you assign a host? I'm confused because my configurations were 172.16.x.0 255.255.255.0, but when i checked the attached zip file and run the configurations, the loopback addresses were 172.16.x.x with /24 mask

    If you create a loopback interface you can configure an IP address just like a normal interface. You need to type 172.16.X.X /24 because that's an IP address. 172.16.X.0 / 24 would be a network address.

    Quote:
    "You notice that when you start a ping from router Y's loopback to the loopback of router X that this is not possible, you need to fix the problem."
    -Is this resolved by changing the mask of the 3 loopbacks to /32 (i was able to ping all the loopback addresses, with my 3 loopbacks set to 172.16.x.0 /24 originally, by changing the mask to /32)

    EIGRP by default will auto-summarize meaning any 172.16.X.X /24 network will be advertised as 172.16.0.0 /16. This will cause trouble if you try to ping from one router to another. Changing the subnet mask will not help if you have "auto-summary" enabled.

    Quote:
    "Change the bandwidth so traffic from router Z to router Y's loopback interface uses the link between X and Z."
    -I tried increasing the bandwidth of f0/0 on router Z but the traffic still goes through f1/0 on router Z.

    EIGRP by default will use bandwidth and delay as its metric. You can take a look at the current best route (successor) to see what the metric is. Play around with the bandwidth until another route has a better metric and you will see a change.

    Quote:
    "Change the EIGRP configuration on all routers so load and reliability are also used as metrics."

    You need to change the K-values. Under the EIGRP configuration you can use the

    Quote:
    metric weights

    command to enable them:

    K1 = bandwidth
    K2 = load
    K3 = delay
    K4 = reliability
    K5 = MTU

  • avatar
    shyampradhan

    Hello Rene,
    first of all thanks for the lab which I'm enjoying doing it and learning new stuff. I found some videos missing in the lab, can you upload it please.
    thanks again,
    Shyam

  • avatar
    tohritz

    Hi Rene,

    Thanks for this. I'll check this out.

  • avatar
    vicken78

    Am I supposed to manually summarize the EIGRP routes?

    Example:
    ip summary-address eigrp 100 172.16.0.0 255.255.255.0

    I could not ping any 172.168 route with auto-summary even with router 2 shut down.

  • avatar
    ReneMolenaar

    Which step do you mean? This one?

    Quote:
    You notice that when you start a ping from router Y's loopback to the loopback of router X that this is not possible, you need to fix the problem.

    Once auto-summary is enabled you might face routing issues because networks are advertised as 172.16.0.0/16.

    You could disable auto-summary but creating a specifix summary yourself can also solve the issue.

  • avatar
    emilio_murray

    I was registered today at this site and is really awesome!.

    Thanks a lot for the material.

  • avatar
    ReneMolenaar

    Thanks for your comment and your welcome :)