To implement vPC in the Cisco ACI fabric, you need to select a common vPC interface policy group, common interface profiles, and common switch profiles. The common vPC interface policy group ensures consistency in the vPC configuration across interfaces. Common interface profiles allow the same configuration to apply to multiple interfaces, reducing the risk of configuration errors. Common switch profiles ensure that the switches participating in the vPC have the same baseline configuration. Individual profiles are not required for this implementation because vPC needs consistency across interfaces and switches.
To reassign a unique globally scoped pcTag to an Endpoint Group (EPG) that provides a global contract in Cisco ACI, you should configure subnets that are shared between Virtual Routing and Forwarding instances (VRFs). This action is necessary because sharing subnets between VRFs allows for route leaking, which is essential for global pcTag assignment, ensuring that the EPG can communicate across different VRFs while maintaining unique globally scoped tags.