WFQ Weighted Fair Queueing

Posted by September 8, 2011 in Quality of Service

Scenario:

Ada and Silver are using the network for a range of applications like FTP, HTTP, TELNET and more. Recently there have been some complaints about slow network performance and it’s up to you to make sure each application gets a fair share of the bandwidth.

Goal:

  • All IP addresses have been preconfigured for you.
  • EIGRP has been configured for full connectivity.
  • Configure the S0/1 interface of router Rae with a bandwidth of 64kbps.
  • Configure WFQ on the S0/1 interface of router Rae. The output hold-queue size should be 128, length of 16 for congestive discard threshold, a maximum of 128 conversations and 4 queues for RSVP.
  • Configure the hardware queue on router Rae so WFQ will be activated as soon as possible.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

Weighted Fair Queueing

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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12 Comments

  2. Glad you like it Brian.

    QOS is a bit hard to test on GNS3 (no performance) but IP SLA is nice to test if you want.

    You can also try to use a ping with big packets to “congest” a link.

  3. Hello Rene,

    Wanted to know why do you use x and y values in the .net file and apart from this i see lot of notes configured in the .net file wonder what they are used for? Thanks

    [[ROUTER Ada]]
    model = 3640
    console = 2010
    cnfg = configs/Ada.cfg
    slot0 = NM-4T
    s0/0 = Rae s0/0
    x = -425.0
    y = -113.0

    [[NOTE 1]]
    text = .3
    x = 54.4472221514
    y = -115.334523779
    color = “#0000ff”

  4. Not sure why it shows the “X” and “Y” at the router section, has to do with the position of the router in the picture.

    The “note” stuff is because I add text to the GNS3 topology. The one you pasted has the text “.3” which is what I placed at the interface for router Silver.

  6. Hello,

    There is one question in this scenario

    •Configure the hardware queue on router Rae so WFQ will be activated as soon as possible.

    Could you please provide the answer for this one.

    Thanks

  7. Hi Vinod,

    Good question! This is one of those ‘little things’ I encountered while studying for my CCIE.

    Qos on routers is a software queue, the hardware queue is always FIFO (first in first out). We can reduce the size of the hardware queue so packets will be shorter in this FIFO. You can use the “hold-queue” command to change this.

    Rene

  8. one question please what is the diffrence between hold queue and tx ring command

    1. Without queueing configured the router does FIFO (First In First Out) by default (software). The hold-queue command configures the size of your FIFO.

      The tx-ring command configures your hardware-queue.

  9. Hi Author !
    you configured right, but i thinks you should verify configuration. In GNS 3 some feature of QoS you can not verify and test exactly.

  11. Hi Rene, The last step of your lab could not be enabled on my GN3 servers I wonder why ? Please advise Cheers !!!!

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