An electronic device that is attached to a mixing machine for calculating the weight of the material being mixed and the number of auger revolutions that has occurred during the mixing process, and a method therefor. The sub-matching block includes: a series matching block of which one end is connected to the main-matching block; and a parallel matching network connected to the other end of the series matching block. If a local multicast forwarding table of the bridge element does not include any forwarding entry for the multicast group, a forwarding entry is selected from the local multicast forwarding table as a candidate for being replaced. The stored data can be refreshed every few seconds as necessary.