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Wired Networks Thread, Disable Unmanaged Switch on Cisco Siwtch in Technical; Hi, Is it possible on a Cisco switch to disable plugging in unmanaged switches please? Thanks...
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    FN-GM's Avatar
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    Disable Unmanaged Switch on Cisco Siwtch

    Hi,

    Is it possible on a Cisco switch to disable plugging in unmanaged switches please?

    Thanks

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    plexer's Avatar
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    How would a switch know that something being plugged in was an unmanaged switch though?

    Maybe port authentication would do what you want?

    Ben

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    Quote Originally Posted by plexer View Post
    How would a switch know that something being plugged in was an unmanaged switch though?
    It would see multiple device mac addresses on 1 port.

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    Quote Originally Posted by FN-GM View Post
    It would see multiple device mac addresses on 1 port.
    In which you may want to limit the no. of mac addresses per port i.e. only allow a max of two. Configure the violation to shutdown the port etc maybe.

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    apparently enabling spanning-tree BPDUGuard enable on the port will solve it.

    Thanks

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    plexer's Avatar
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    Excellent thanks for the update. You don't use voip phones with integrated switches do you?

    Ben

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    Yep we use VOIP phones.

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    switchport port-security maximum 2 ! or whatever number is appropriate
    switchport port-security violation
    shutdown switchport port-security

    So a voip phone with a pc connected would be seen as 2 devices?

    Ben

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    FN-GM's Avatar
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    None of our VOIP phone have PC's connected as well. They all have dedicated ports.

    So those commands will make it so they only can allow 2 devices connect to that port?

    Thanks

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