Take a look at this doc:
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3650-series-switches/qa_c67-729531.html
Q. What are the license requirements for a Cisco Catalyst 3650 switch stack?
A. In a Cisco Catalyst 3650 stack, all switches should be at the same image-based license (IP Services/IP Base/LAN Base) level. The active switch license level is considered as the reference, and the member switch licenses are compared against it. If there is a mismatch, the active switch with the syslog message “license mismatch error” indicates that the stacking was unsuccessful.
Q. How is a “license mismatch error” fixed in a Cisco Catalyst 3650 stack?
A. The license level of the mismatched stack member switch can be changed with the license right-to-use activate <license> all acceptEULA CLI command (entire stack should have the same wired license level) and reloaded from the active switch console. This will enable the member switch to join the stack successfully. The customer has to purchase a license before moving to a specific license level.
Q. What happens after 90 days of activating an evaluation RTU license?
A. An evaluation RTU license EULA expects that customers will purchase a permanent license within 90 days. After 90 days the evaluation license will not be valid. Warning syslog messages about the evaluation license expiration are generated 10 and 5 days before the 90-day window ends. Warning syslog messages are generated every day after the 90-day period. The expired evaluation license continues to function with the daily syslog messages until the switch is reloaded. The expired evaluation license cannot be reactivated after the reload.
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