Re: [LARTC] HTB equivalent for 'bounded' and 'isolated' in CBQ

[Amit Kucheria <amitk@ittc.ku.edu>]

On Fri, 16 Aug 2002, Stef Coene wrote:

>> The 'ceil' parameter allows us to implement a part of the 'isolated'
>> definition above. By setting it equal to 'rate', the class does not
>> borrow bandwidth, but what will stop other classes from borrowing its
>> unused bandwidth?
>
> Providing no ceil parameter means rate = ceil.  But this can not be
> used to implement isolated like in cbq. Rate = ceil means the class
> can not use more bandwidth then it's rate. Isolated in cbq means other
> classes can not borrow bandwidth from the class and that's not the
> same.  There is no way you can implement isolated with htb.
>
> But with htb you can do something like this :
>
> Total : 100
> class1   rate 20   ceil 20
> class2   rate 40   ceil 80
> class3   rate 40   ceil 80
>
> class 1 is isolated like in cbq. It can not use more then it's
> rate/ceil and class2 and class3 will never use bandwidth from class1,
> only from each other. Just like the definition of isolated :)

What happens when there is no traffic in class 1? Will class 2 and 3 
share class 1's bandwidth then?

The reason I am asking these questions is because I am trying to see if 
HTB can be used in place of CBQ in Diffserv. Has anybody tried something 
like this?

Regards,
Amit

-- 
I'm an angel!!! Honest!
The horns are just there to hold the halo up straight.
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                  Amit Kucheria
          EECS Grad. Research Assistant
         University of Kansas @ Lawrence
   (R): +1-785-830-8521 ||| (C): +1-785-760-2871
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