the designated forwarder (DF) takes on the role of the aggregated Ethernet interface. The provider edge (PE) that is the non-DF will send LACP out-of-sync packets to the CE. This causes LACP to go down on the CE device, and the CE device does not use the links connected to the non-DF for sending traffic. If the connection between a CE and a DF PE fails, the PE is re-elected as a DF.