Designated Forwarder

When a Customer Edge (CE) device is multihomed to a set of Provider Edge (PE) devices on an Ethernet Segment (ES) operating in all-active redundancy mode, one of these PE devices is selected as the Designated Forwarder (DF) for a given ES and Ethernet VPN Instance (EVI). The DF is responsible for sending Broadcast, Unknown Unicast, and Multicast (BUM) traffic to the CE device. The DF eliminates duplication of BUM packets in the network-to-access direction by preventing the other PE devices on the ES from delivering the same multi-destination traffic to the CE device.