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X440/X460 dual stack master

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TitleX440/X460 dual stack master
Symptoms
In a stack with X440 and/or X460  switches dual mastership is seen, in some circumstances a manual reboot of the stack is needed to resolve this.
Environment
  • EXOS < 15.6
  • Stack X440/X460 switches
Cause
This is caused by an issue in the older libraries used in EXOS < 15.6.
 
Resolution
To resolve the issue immediately reboot the complete stack,
To prevent this from happening again upgrade the stack.

Upgrade to EXOS 15.6 or higher, recommended is to use the recommended EXOS version from this article.
 What Is The Recommended SW Release For My Platform?
Additional notes

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