Figure 1512 Frame Relay Data Frame Transmission Flowchart

DE requires that the Frame Relay network interpret, and in some cases act on, the DE bit. Some networks take no action when the DE bit is set, and other networks will use the DE bit to determine which frames to discard. Often the DE bit is used to determine which frames should be dropped first or which frames have lower time sensitivity.

DE lists can be created within the Cisco routing device to identify the characteristics of frames eligible for discarding. DE groups can be specified to identify the DLCI that is affected.

When a DE frame is discarded, it is up to the upper-layer protocols, such as TCP, to determine the loss and effect corrective actions as determined by the protocol's data correction and retransmission algorithms.

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