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MQC Frame Relay Voice-Adaptive Traffic Shaping

Written by Rene Molenaar on . Posted in Quality of Service (QOS)

Scenario:

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!

Goal:

  • All IP addresses have been preconfigured for you.
  • Configure router Kos so there is a priority queue of 64Kbps for VoIP packets on the frame-relay link.
  • Configure router Kos so you don't exceed the CIR rate of 128Kbps when there are VoIP packets in the queue.

IOS:

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Topology:

Voice-Adaptive Traffic Shaping

Video Solution:

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Comments (2)

  • avatar
    baloo247
    2012-04-29 05:11:33

    Interesting lab. With FRTS I keep getting stuck on the heirachical policy maps. A few questions.

    1. Am I right in saying that we are using MQC for the shaping, which is the reason for the config under the class-default in teh policy map?

    2. Why use shape peak and now shape average?

    Configure router Kos so you don't exceed the CIR rate of 128Kbps when there are VoIP packets in the queue.

    With this statement the shape peak allows us upto 256Kbps, so why not use the shape average command?

    Keep up the good work, these labs are helping me with my CCIE written preparation.

  • avatar
    ReneMolenaar
    2012-05-01 11:02:37
    Quote:
    Am I right in saying that we are using MQC for the shaping, which is the reason for the config under the class-default in teh policy map?

    Yes this is the MQC method of configuring shaping for frame-relay. You can also use the "legacy" method but I don't think you have to do that anymore on the CCIE exam.

    Quote:
    Configure router Kos so you don't exceed the CIR rate of 128Kbps when there are VoIP packets in the queue.

    With this statement the shape peak allows us upto 256Kbps, so why not use the shape average command?

    Good question, it doesn't matter too much I think. By setting the peak rate to 256kbps you end up with a CIR of 128kbps...you could also use the average shaping command.