Connecting 3 switches to a fourth switch, each with its own crossover cable shuts down ports

Discussion in 'Cisco' started by Ned, Mar 29, 2007.

  1. Ned

    Ned Guest

    This is probably a very basic question but I need to ask it anyway
    since there is no easy way to test it while everyone is on the
    network. I have (3) 3com switches, all are connected via a proprietary
    backplane cable called a matrix cable whis is sort of like a crossover
    cable. I added a fourth switch, a Cisco catalyst, and decided to plug
    each 3com into the Cisco switch using three crossover cables, one
    cable for each 3com, connected to the Cisco. Later I would connect the
    Cisco to a trunk. After plugging in the three xover cables I noticed
    only one port was active, and if I unplugged the active port, one of
    the other two ports became active. Is this spannig tree? was it doing
    this to prevent a loop? Will this config work once I remove the matrix/
    backplane cable?

    thanks
    NH
     
    Ned, Mar 29, 2007
    #1
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  2. "Ned" <> writes:
    >This is probably a very basic question but I need to ask it anyway
    >since there is no easy way to test it while everyone is on the
    >network. I have (3) 3com switches, all are connected via a proprietary
    >backplane cable called a matrix cable whis is sort of like a crossover
    >cable. I added a fourth switch, a Cisco catalyst, and decided to plug
    >each 3com into the Cisco switch using three crossover cables, one
    >cable for each 3com, connected to the Cisco. Later I would connect the
    >Cisco to a trunk.

    ....
    > After plugging in the three xover cables I noticed only one port was
    >active, and if I unplugged the active port, one of the other two
    >ports became active. Is this spannig tree?


    Yes.

    > was it doing this to prevent a loop?


    Yes, because you made loops. The stack cable makes the 3 behave as one.

    > Will this config work once I remove the matrix/backplane cable?


    It works now.

    But, yes it will still work when you unstack them as well.
     
    Doug McIntyre, Mar 29, 2007
    #2
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  3. Ned

    Ned Guest

    On Mar 29, 2:10 pm, Doug McIntyre <> wrote:
    > "Ned" <> writes:
    > >This is probably a very basic question but I need to ask it anyway
    > >since there is no easy way to test it while everyone is on the
    > >network. I have (3) 3com switches, all are connected via a proprietary
    > >backplane cable called a matrix cable whis is sort of like a crossover
    > >cable. I added a fourth switch, a Cisco catalyst, and decided to plug
    > >each 3com into the Cisco switch using three crossover cables, one
    > >cable for each 3com, connected to the Cisco. Later I would connect the
    > >Cisco to a trunk.

    > ...
    > > After plugging in the three xover cables I noticed only one port was
    > >active, and if I unplugged the active port, one of the other two
    > >ports became active. Is this spannig tree?

    >
    > Yes.
    >
    > > was it doing this to prevent a loop?

    >
    > Yes, because you made loops. The stack cable makes the 3 behave as one.
    >
    > > Will this config work once I remove the matrix/backplane cable?

    >
    > It works now.
    >
    > But, yes it will still work when you unstack them as well.


    Thanks!
     
    Ned, Mar 29, 2007
    #3
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