Multilink PPP Link Fragmentation and Interleaving over Frame Relay


As one of the network engineers for a large frame-relay provider in the US you are asked by your boss to configure QoS. One of your customers insists there will be authentication in the future for his frame-relay connection. You don’t have to configure authentication right now but you remember you can do this by using PPP on a frame-relay link. You do have to setup QoS right now though…


  • All IP addresses have been preconfigured for you.
  • Configure Multilink PPP on the frame-relay link between router Kos and Quall.
  • Classify and mark TELNET and HTTP traffic on router Kos and Quall. Use DSCP value AF21 for TELNET traffic and AF31 for HTTP traffic.
  • Create a policy on router Kos and Quall with the following configuration:
  • TELNET traffic should have 64Kbps of priority bandwidth.
  • HTTP traffic should have 10% of the remaining bandwidth.
  • Enable Link fragmentation and interleaving and ensure there is a delay of 20ms on the frame-relay link.




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Multilink PPP LFI over Frame-Relay

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Configuration Files

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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


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