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  • Content created by Rene Molenaar (CCIE #41726)


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Forum Replies

  1. Hi Rene,
    I have couple of questions here…
    Consider a stack of 2 switches. Do We need to enable spanning tree on the stack for connecting other switches on this stack, in a redundant manner ?
    Also How does the IOS upgrade happen on the member switches in stack? Would the upgrade on master take care the member switches too?

  2. Hi Ashok,

    You don’t need STP for the connections between the switches in the stack, the stack is seen as one “logical” switch.

    If you want to upgrade the IOS image then you should copy the image to the flash memory of all your switches, then configure the master switch to boot the new image and reload the switches. Cisco has a good document with some examples:



  3. When a switch joins the stack then it will pick the lowest available member in the stack.

    If you have 5 switches and you want to number them from top to bottom then it might be a good idea to configure them like this:

    switch 1 priority 15
    switch 2 priority 14
    switch 3 priority 13
    switch 4 priority 12
    switch 5 priority 11

    This ensures that the same switch is always elected as the master and that the interface numbers will match.

    If needed, you can also rename them later:

    switch 4 renumber 5

    This will rename switch number 4 to 5.

  4. Yes that’s clears my doubt. Thanks a lot.

  5. great thank you for your help and great explaination.

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