Frame Relay Notes - DE, FECN, and BECN 2011-06-23 ·2 min read All are part of the frame relay congestion management suite. Frame relay switches monitor links for CIR or oversubscription congestion on links. If the VC has a CIR of 256k, the switch knows there is …350-001becncciedefecnframefrtslapfrelaywritten