Your browser failed to load CSS style sheets. Your browser or web proxy might not support elliptic-curve TLS

Building network automation solutions

9 module online course

Start now!
back to overview

Frame Relay congestion management

In the “good old days” we've been teaching our students that although a router can act as a Frame Relay switch, it supports only the rudimentary functionality of switching the packets, but not the policing/marking features available in Frame Relay switches. That hasn't been true for a while - in IOS release 12.1T, Cisco has introduced the congestion management features. You can specify the congestion management per-interface (with the frame-relay congestion-management interface configuration command) and set the DE drop/ECN mark percentages for all PVCs on the interface or you can set the parameters within a map-class.

I don't know how useful this feature is to you; I was fond of finding it because it solves some interesting problems I had a (long) while ago. If you need more in-depth description or actual configurations, post a comment or send me a message.

Please read our Blog Commenting Policy before writing a comment.


  1. it would be usefull, because many enterprise still use FR. And may CCIE candidate read you blog, it will be usefull for them too :)

  2. It would be helpful if you could post one or two example configs. Since your links are already invalid due to Cisco reorganizing their Online Docu.


Constructive courteous comments are most welcome. Anonymous trolling will be removed with prejudice.