Answer provided is correct:
The Link Management Protocol (LMP) is activated on each link of the StackWise Virtual link as soon as it is brought up online. The 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
https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-en.html
the other protocol besides LMP is SDP (StackWise Discovery Protocol) used for the following:
- Determines whether the hardware and software versions allow a Cisco StackWise Virtual domain to be formed
- Determines which switch will become the active virtual switch and which will become the standby virtual switch from a control-plane perspective
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