A system for determining a spanning tree for a computer network is disclosed. The system includes a computing device and a computer-readable medium. The computer-readable medium is part of the computing device or is in electronic communication with the computing device. The computer-readable medium comprises executable instructions for implementing a method for determining the spanning tree for the computer network. Multicast alias domains from the computer network are discovered. The discovery of communication metrics by the multicast alias domains is coordinated. The communication metrics from the multicast alias domains are determined. A minimum spanning tree for the computer network is constructed by using the communication metrics. The minimum spanning tree is stored and used in computer system administration.