Broadcast, unknown-unicast and multicast traffic (BUM traffic)[1] is network traffic transmitted using one of three methods of sending data link layer network traffic to a destination of which the sender does not know the network address. This is achieved by sending the network traffic to multiple destinations on an Ethernet network.[2] As a concept related to computer networking, it includes three types of Ethernet modes: broadcast, unicast and multicast Ethernet. BUM traffic refers to that kind of network traffic that will be forwarded to multiple destinations or that cannot be addressed to the intended destination only.[3][4]
^Deploying ACI: The complete guide to planning, configuring, and managing Application Centric Infrastructure, Frank Dagenhardt, Jose Moreno and Bill Dufresne, 12 feb 2018 by Cisco Press
^IP Multicast, Volume I: Cisco IP Multicast Networking by Josh Loveless, Ray Blair and Arvind Durai, 12 Oct 2016 by Cisco Press. Part of the Networking Technology series