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QoS Question

Hi all,

We have a pair of SG450 UTM Appliances (Firmware version 9.405-5) running in Hot Standby Mode.

Is it wise, when creating a Bandwidth Pool to assign a relatively low amount of bandwidth to be reserved for a specific Traffic Selector and use the Upper Bandwidth Limit to control the total bandwidth consumed by the specified Traffic Selector?

I'm only asking because I'm a bit confused about whether or not the reserved bandwidth is usable by any other application when it has been reserved in a Bandwidth Pool.

For example, I have created a Traffic Selector containing several streaming media applications I wish to control (all other streaming media applications are blocked). I then created a Bandwidth Pool, based on the Streaming Media Traffic Selector which reserved 4096 kbit/s bandwidth with an upper limit of 10240 kbit/s bandwidth. Finally I created a Download Throttling rule to limit each source address to 256 Kbit/s. Overall (and I may be wrong in this), my hope was to limit streaming media applications to 10240 kbit/s and to limit each source address on my internal network to 256 kbit/s.

But I'm still concerned by the initially reserved bandwidth of 4096 kbit/s. Am I effectively removing this from my overall available bandwidth and would it be better to reserve a lower amount and let the upper limit ensure that streaming media doesn't consume my entire Internet connection?

Many thanks (and apologies if the question is badly worded),

John P



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  • I hate all the QoS terminology with different vendors. Basically All QoS does is creates queues and sends a packet in that queue depending on the QoS settings. When you say guaranteed bandwidth in a certain queue, you are basically prioritizing the available bandwidth in that queue. 

    So to answer your question, your 4 megs is not reserved bandwidth in a sense that nobody else can use it. If you have 100 megs total available, anyone can use 100 megs, however when a media app makes a request, it will have first priority to use up to 4 megs of your total bandwidth and only 96 will be available as long as your media queue is full. I generally don't assign guaranteed bandwidth to anything but voip traffic.

    Upper limit is self explanatory and you are telling QoS that don't let media streaming use more than 10 megs of my available bandwidth under ANY circumstances no matter how much free bandwidth I have available.

    Hope this helps. 

  • Hi Billybob,

    Thank you for the clarification, it gives me a much better understanding of QoS.

    Much obliged,

    John P

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