How is congestion handled in Frame Relay?
What will be an ideal response?
Frame relay switches attempt to control congestion on the network. When the Frame Relay switch recognizes congestion, it sends a forward explicit congestion notification (FECN) message to the destination router. This message tells the router that congestion occurred on the virtual circuit. In addition, the switch sends a backward explicit congestion notification (BECN) message to the transmitting, or source, router. The router's reaction to the BECN should be to reduce the amount of traffic it is sending.
A network administrator can configure certain types of traffic at the router as discard eligible (DE). Thus, during times of congestion, the router can discard DE frames to provide a more reliable service to frames that are not discard eligible. DE lists can be configured on a Cisco router to identify the characteristics of frames eligible for discard. These lists are created based on the protocol or the interface, as well as on other characteristics.
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