1. A method to proactively monitor user network interfaces, the method comprising: obtaining first information related to operation of a physical port; determining that the physical port implements both a first user network interface and a second user network interface; combining the first information with second information related to operation of a first logical port implementing the first user network interface, but not implementing the second user network interface, to assess performance of the first user network interface; and combining the first information with third information related to operation of a second logical port implementing the second user network interface, but not implementing the first user network interface, to assess performance of the second user network interface.