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  • how to control full traffic

    Guys...
    I really need help here..
    I am currently using Cisco 1721 router and my Internet is always full day to day.. My bos has been complaining but I can't do anything about it, since our clients pay and definitely they're hoping they can download anything as they like.
    Is there someway I can manage it through QoS or packet management which I limit the download percentage and speed without have to buy Packeteer or something like that.

    Thanks

  • #2
    Re: how to control full traffic

    Hi Joker

    I would suggest, at the minimum, using CAR (committed access rate). This is a "rate-limit". So, you would be defining a max bit rate per protocol per user, or however, you want to do it. It basically maxes them out at whatever you set. Here is the CAR configuration guide.

    To get more fancy and have them more dynamically share bandwidth without maxing them out at a certain rate (but still not letting one person over utilize the bandwidth), I would recommend Class Based Weighted Fair Queuing (CBWFQ) - here is the CBWFQ configuration guide.

    I'll tell you that a packeteer (or similar) is certainly much easier to use than and IOS QoS solution. On the other hand, the IOS solutions don't cost you anything and the packeteer is going to be expensive. So, when you are pulling your hair our with Cisco QoS, just remember all the money you saved

    Hope that helps.
    David Davis - Petri Forums Moderator & Video Training Author
    Train Signal - The Global Leader in IT Video Training
    TrainSignalTraining.com - Free IT Training Products
    Personal Websites: HappyRouter.com & VMwareVideos.com

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    • #3
      Re: how to control full traffic

      Hi David

      Thank you so much for the reply
      I am applying CBWFQ now... it seems OK.
      However, one quick question: do you happen to know the difference between shape peak and shape average?

      Yeah, I am trying to avoid Packeteer, if I propose to buy one, i'll have my head chopped since it is so expensive..

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      • #4
        Re: how to control full traffic

        As I understand it,
        the peak is the top
        the average is the middle (the average of all)

        but here is the doc with more explanation, taken from this URL:
        http://www.groupstudy.com/archives/c.../msg00795.html

        > > Specifying Average Rate or Peak Rate Traffic Shaping Design Rule
        > > ================================================
        > >
        > > Traffic shaping limits the rate of transmission of data.
        > >
        > > You can specify two types of traffic shaping; average rate shaping and
        > > peak rate shaping. Average rate shaping limits the transmission rate
        > > to the committed information rate (CIR). Using the CIR ensures that
        > > the average amount of traffic being sent conforms to the rate expected
        > > by the network.
        > >
        > > Peak rate shaping configures the router to send more traffic than the
        > > CIR. To determine the peak rate, the router uses the following
        > > formula:
        > >
        > > peak rate = CIR(1+Be/Bc) >> peak = CIR + [Be/Tc] which is more than
        > > CIR.
        > >
        > > where:
        > >
        > > Be is the Excess Burst rate.
        > >
        > > Bc is the Committed Burst rate.
        > >
        > > Peak rate shaping allows the router to burst higher than average rate
        > > shaping. However, using peak rate shaping, the traffic sent above the
        > > CIR (the delta) has the potential of being dropped if the network
        > > becomes congested.
        > >
        > > If your network has additional bandwidth available (over the
        > > provisioned CIR) and the application or class can tolerate occasional
        > > packet loss, that extra bandwidth can be exploited through the use of
        > > peak rate shaping. However, there may be occasional packet drops when
        > > network congestion occurs. If the traffic being sent to the network
        > > must strictly conform to the configured network provisioned CIR, then
        > > you should use average traffic shaping.
        > >
        > > R6(config-pmap-c)#shape ?
        > >
        > > average configure token bucket: CIR (bps) [Bc (bits) [Be
        > > (bits)]],
        > > send out Bc only per interval
        > >
        > > peak configure token bucket: CIR (bps) [Bc (bits) [Be
        > > (bits)]],
        > > send out Bc+Be per interval
        David Davis - Petri Forums Moderator & Video Training Author
        Train Signal - The Global Leader in IT Video Training
        TrainSignalTraining.com - Free IT Training Products
        Personal Websites: HappyRouter.com & VMwareVideos.com

        Comment

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