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844 Views 5 Replies Latest reply: May 7, 2012 5:00 AM by alib_15 RSS

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STP case study

May 3, 2012 7:41 AM

alib_15 48 posts since
May 3, 2011

Hi there. I was hoping someone could help me with this Packet Tracer exercise.

I think it just involves changing the bridge priority but it's driving me nuts!

 

I've added the .pka file as an attachment.

 

Any help would be really appreciated.

Thanks in advance.

Attachments:
  • CiscoLoco - CCNP 956 posts since
    Feb 11, 2009
    Currently Being Moderated
    1. May 3, 2012 8:31 AM (in response to alib_15)
    Re: STP case study

    It seems to be bug related to packet tracer.  I assume you are trying to change port priority to modify which ports are blocked.  I tried the lab you attached and it isn't behaving properly (remote switches dont see the change in priority) however I can assure you that in real equipment changing port priority will work as you were probably expecting packet tracer to

  • CiscoLoco - CCNP 956 posts since
    Feb 11, 2009
    Currently Being Moderated
    3. May 3, 2012 9:08 AM (in response to alib_15)
    Re: STP case study

    I saw posts that were several years old talking about this problem so Im not sure if it ever worked.  Sorry, dont know where you would get an older version

  • chemilio 243 posts since
    May 31, 2009
    Currently Being Moderated
    4. May 3, 2012 10:19 AM (in response to alib_15)
    Re: STP case study

    Hi alib_15,

     

    Task1: You have determined that you want the Core #2 switch to be the root switch in the spanning tree. Make the necessary changes to ensure that Core #2 is _always_ chosen as the root. (Hint: don’t use zero!). You also want Core #1 to be the designated _backup_ root bridge.

     

    The keyword there is _always_.

    On core #2

    use the "spanning-tree vlan 1 root primary" command

     

    The keyword is _backup_

    On core #1

    use the " spanning-tree vlan 1 root secondary"

     

     

    Task 2: Adjust the necessary parameters on the distribution switches and access switches so that the primary links are used rather than the redundant links (Hint: a faster link has a lower cost!)

     

     

    Use a lower cost than 19 under the port you want to be primary.

    use the "spanning-tree vlan 1 cost 4"- for example to make it a Gig link

     

    HTH,

     

    Chemillio

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