Following Logs seen in summit stack :
This warning message appears if a switch with reduced capabilities serves as the backup node for a switch with greater capabilities in a stack.
It is recommended to select most-capable switches as Master / backup nodes in a stack.For more details on capabilty, master, backup and standby roles configuration / recommendation refer section "Configuring the Master, Backup, and Standby Roles" from page 149 of followinglink http://documentation.extremenetworks.com/exos_16/exos_16_2/preface/c_introduction.shtml
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