Cisco Systems Cisco Systems Cisco Systems This document proposes a proactive, in-band network OAM mechanism to detect connectivity faults that affect unicast and multi-destination paths in an EVPN network. The multi-destination paths are used by Broadcast, unknown Unicast and Multicast (BUM) traffic. The mechanisms proposed in the draft use the principles of the widely adopted Bidirectional Forwarding Detection (BFD) protocol.