vPC Role

There are two defined vPC roles: primary and secondary.
vPC role defines which of the two vPC peer devices processes Bridge Protocol Data Units (BPDUs) and responds
to Address Resolution Protocol (ARP).
Use role priority <value> command (under vPC domain configuration context) to force vPC role to primary for a
dedicated peer device.
<value> ranges from 1 to 65535 and the lowest value will dictate the primary peer device.
In case of tie (same role priority value defined on both peer devices), lowest system mac will dictate the primary
peer device.
To know which of the 2 peer devices is primary or secondary, use show vpc role command:

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