Port profiles are nothing but a collection of interface configuration commands (the same as physical switches) that can be dynamically applied at either physical or virtual interfaces on Cisco N1KV. So, as an effect, if you make any change to a given port profile it will be propagated immediately to all the ports that have been associated with it. For troubleshooting in a port profile, you have the flexibility to define a collection of attributes, such as VLAN, private VLAN (PVLAN), ACL, port security, NetFlow collection, rate limiting, QoS marking, and even remote-port mirroring, but only through Encapsulated Remote SPAN (ERSPAN).
VN-Link can be implemented as a Cisco distributed virtual switch (DVS), running entirely in software within the hypervisor layer (N1KV) or in devices that support network interface virtualization (NIV), eliminating the requirement for software-based switching within hypervisors (Cisco UCS).