MQC Frame Relay DE Marking


As one of the network engineers for a large frame-relay provider in the US you are asked by your boss to configure QoS. Whenever there is congestion there is a certain amount that could be dropped from customers, it’s up to you to configure it!


  • All IP addresses have been preconfigured for you.
  • Configure router Kos so all TELNET traffic from router James has the Discard Eligible bit set for the PVC with DLCI 102.




Frame Relay DE Marking

Video Solution:

Configuration Files

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Once you are logged in you will find the configuration files right here.

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Written by René Molenaar - CCIE #41726

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About the Author: Rene Molenaar

René - CCIE #41726 is the creator of where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on


  1. Hi Rene,

    Just a bit of confusion with the instructions. You said "for the PVC with DLCI 102."

    I though that meant you wnated us to use a map-class under DLCI-102 rateher tahn a service-polycy output on the physical interface…

    Just saying, both method work anyway.


  2. I did it this way:

    Extended IP access list 100
    10 permit tcp eq telnet
    20 permit ip any any
    int s1/0
    frame-relay de-group 1 102

    on quall

    Quall#sh frame-relay pvc | begin DE
    out BECN pkts 0 in DE pkts 20 out DE pkts 0

    as you said its not dropping but at least is marking

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