ECN: L2 Bridge

Explicit congestion notification (ECN) enables end-to-end congestion notification between two endpoints on TCP/IP-based networks. ECN is disabled by default. You can enable ECN only on queues that handle best-effort traffic because other traffic types use different methods of congestion notification-lossless traffic uses priority-based flow control (PFC), and strict-high priority traffic receives all of the port bandwidth it requires up to the point of a configured maximum rate. You enable ECN on individual output queues (as represented by forwarding classes) by enabling ECN in the queue scheduler configuration.