A. Incorrect - role priority influences vPC primary/secondary election.
B. Incorrect - System priorities match however uses default values of lacp, would not ensure n7k's are primary devices.
C. Incorrect - vPC System priorities do not match between the peers, this config would result in vPC's never coming up.
D. Correct - Defining a system priority of 4000 in vpc domain config ensures lacp priority for vPC's would be 4000, the lower the number the more likely to become lacp master.
D is correct. System priority needs to the same on both switches otherwise VPC will not form.
Lower system priority translates to higher LACP priority which ensures the VPC switches would be the master in LACP election.
D is correct.
What is the purpose and usage of the system priority command under vpc configuration mode? The vpc quick config guide mentioned: "You should manually configure the vPC system priority when you are running Link Aggregation Control Protocol (LACP) to help ensure that the vPC peer devices are the primary devices on LACP".
When you manually configure the system priority, ensure that you configure the same priority value on both vPC peer devices. If these values do not match, vPC will not come up.
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