Explanation The Link Management Protocol (LMP) performs the following functions: + Verifies link integrity by establishing bidirectional traffic forwarding, and rejects any unidirectional links + Exchanges periodic hellos to monitor and maintain the health of the links + Negotiates the version of StackWise Virtual header between the switches StackWise Virtual link role resolution Reference: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-en.html