BECN - Backward Explicit Congestion Notification is a bit in the Frame Relay header that is set by the destination and sent BACK to the originator indicating congestion in the path and to slow down transmission of data.
FECN - Forward Explicit Congestion Notification is a bit in the Frame Relay header that is set by the sender and is FORWARDED to the destination to indicate congestion in the path and to slow down requests for data.
Note that these are set by a Frame Relay switch in general so are received by a router rather than sent by a router.
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