Is it true that a switch plugged into a Cisco Switch can disable that port?

Posted on 2011-05-12
Last Modified: 2012-05-11
I am being told that if I plug a 8 port switch into a Cisco 2950, that the port I plug into will be disabled.  OK, for some reason I do not buy it.  I have a couple of these already deployed around campus and do not seem to see any issues.  Then again, I am not a Cisco switch expert.  I know the Cisco is using spanning tree protocol if that helps.

Question by:ACAWI
    LVL 8

    Expert Comment

    If you have created a loop yes it will shutdown the port. If you are just extending your network with only one port plugged into switches you will be fine.

    Author Comment



    Quick answer, Awesome!  

    Could you give a quick example of creating a loop?  As of now, the switch would only extend the network because of a lack of available wired ports back to the Cisco.  All devices connected to the additional switch would use the network DHCP server for IP address assignment.

    LVL 8

    Accepted Solution

    Loop would be if you plugged that switch into your cisco and then you plugged another port on that switch to the cisco or to a switch that is connected to the cisco.

    Author Closing Comment

    Got it.  Makes sense now.  Thanks for your quick responses.

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