In a multiple interface, low power and lossy network comprising multiple nodes, a root phase device obtains phase differential and absolute phase information from the devices in various network paths. Each device in a network path determines the differential phase data compared to its parent device in a network path. The device transmits the differential phase data to the parent device. The parent device transmits the differential phase data up the network path toward the root phase device. The root phase device collects the differential phase data and transmits the data to a central device. The central device determines the absolute phase of all devices. The root phase device can propagate absolute phase information to all devices within the network. Each device determines the absolute phase data by comparing the phase data of the device with the absolute phase data. The phase data is transmitted to a central device.