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What is the DE bit ?
The DE bit is used to indicate that the frame has a lower importance than other frames and should be dropped first if the network experienced congestion.
How to set the DE bit?
We can use a simple network to test our configuration. R1 is connected via frame-relay to R2
Method1: Frame-relay de-list [...]

To apply frame-relay traffic shaping using a normal map-class, the command frame-relay traffic-shaping must be applied to the main interface.
This method has a pitfall; the problem is that when you apply the frame-relay traffic-shaping command to the main interface any DLCI that has no explicit map-class will be shaped to 56K by default. This means [...]

Routers can be configured as Frame Relay switches to be used mostly in service provider or LAB environments. Lets see how you can configure frame-relay switch to use your in studies.
On a Frame Relay switch, frames from a Frame Relay PVC arriving o­n an incoming interface are switched to a Frame Relay PVC o­n an [...]

Frame relay interfaces can be configured as Physical, Multipoint and point-to-point interfaces. Frame relay routing protocols and mostly all network configuration is heavily affected by interface type selected.
In the following digram R1 is connected to R2 using frame-relay and we are going to explore different configuration options.
Task1: Configure frame-relay PVC between R1 and R2 [...]