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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. great thank you for your help and great explaination.

  4. Good day my friend,

    It means the switch that has been pre-configured vs a switch that hasn’t been pre-configured. What do I mean by this? it means the switch which had some configurations before joining the stack will be selected ahead of the switch that had zero configs in its nvram.

    Hope you understand it now :slight_smile:

  5. @wlakshmikant,
    I think I understand what you are saying. Yes, master re-election will occur (upon powering on the stack) if you add a new switch while the stack was powered off. However, there will be no re-election if you add that switch while the stack is up and running.

    Think of this as OSPF DR/BDR/DROTHER election/re-election on multi-access network.

    ... Continue reading in our forum

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