Cisco CCNA / CCNP Certification Exam: Frame Relay BECNs and FECNs
BECNs and FECNs aren’t just important to know for your Cisco CCNA and CCNP certification exams – they’re an important part of detecting congestion on a Frame Relay network and allowing the network to dynamically adjust its transmission rate when congestion is encountered.
The Forward Explicit Congestion Notification (FECN, pronounced “feckon”) bit is set to zero by default, and will be set to 1 if congestion was experienced by the frame in the direction in which the frame was traveling. A DCE (frame relay switch) will set this bit, and a DTE (router) will receive it, and see that congestion was encountered along the frame’s path.
If network congestion exists in the opposite direction in which the frame was traveling, the Backward Explicit Congestion Notification (BECN, pronounced “beckon”) will be set to 1 by a DCE.
If this is your first time working with BECNs and FECNs, you might wonder why the BECN even exists – after all, why send a “backwards” notification? The BECN is actually the most important part of this...
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