This was fixed by doing the following (in my case):
- I was using Static IP routing on my Master 2960S using sdm prefer lanbase-routing and ip routing. The 2nd switch in the stack wasn't in lanbase-routing mode and I believe those assertion failures came from this fact.
- I unplugged the stack cables from switch 2, logged in and set sdm prefer lanbase-routing, saved config, reloaded and then set ip routing in config mode. I saved config again. I then plugged the stack cables back in and switch automatically reloaded.
- When switch 2 came back and was added to the stack automatically, all was fine and stable. I plugged Ethernet cables in several ports without any failures and/or warning messages.
I wanted to log this on the forum because I couldn't find any solution/answer in research online.
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