From: Kenneth Wygand (KWygand@customonline.com)
Date: Tue Jul 13 2004 - 09:12:44 GMT-3
Scott,
While either answer will technically work, "max-reserved-bandwidth 80" is the more correct answer. This merely sets and upper bound on the cumulative percentages of bandwidth you can "guarantee" (more appropriate than "reserve", because other classes can use the bandwidth "guaranteed" for another class when not being used). In older versions of code (12.1T and 12.2), the percentage you guaranteed through "bandwidth-percent", is actually a percent of the "max-reserved-bandwidth" as opposed to a percentage of the full link bandwidth. However, in 12.2T and 12.3, this has been changed to reflect the percentage of the full link bandwidth.
So in versions 12.2T and 12.3, the max-reserved-bandwidth is not used in any calculations, rather it is merely an upper boundary. It's like if you wanted to take $800 out of an ATM machine (banking, not asynchronous transfer mode ;-). Does it matter if the upper limit is $800 or $1000? No, either way you will be able to accomplish what you need. But if the default is $750, it would perhaps appear "more correct" or show a better understanding of the technology if you raised it to $800, or 80% in your case.
There is still one catch. This leaves 20% for the default-class, but this is not guaranteed during times of congestion. If you want to -guarantee- 20% for the default-class, you will need to include a bandwidth-percent command under the default-class and then change the max-reserved-bandwidth to 100, since you are now actually reserving (again, I don't like the terminology) 100% of the bandwidth.
Hope this helps!
Ken
________________________________
From: nobody@groupstudy.com on behalf of Yasser Aly
Sent: Tue 7/13/2004 5:07 AM
To: Scott Savage; ccielab@groupstudy.com
Subject: RE: Max-reserved-bandwidth question
Hi Scott,
I didn's said that this is an RSVP question. It is as you said a CBWFQ
question. Still didn't get an answer on whether to set the
max-reserved-bandwidth to be 80 or 100.
Regards,
Yasser
-----Original Message-----
From: Scott Savage [mailto:rolande23@sbcglobal.net]
Sent: Tue 7/13/2004 6:10 AM
To: Yasser Aly; ccielab@groupstudy.com
Cc:
Subject: Re: Max-reserved-bandwidth question
Yasser are you sure this is an RSVP question? Sounds
like you need to be using CBWFQ and setting classes
with bandwidth percent statements or using Custom
Queuing.
--- Yasser Aly <yasser.aly@noorgroup.net> wrote:
> Hi Group,
>
> The task is asking to do the following
>
> Assign 30% for Class A
> Assign 20% for Class B
> Assign 30% for Class C
>
> The rest of the traffic will use the default-class.
>
> As the summation of the reserved bandwidth is over
> 75% so the
> max-reserved-bandwidth needs to be modified.
>
> My question is that would the max-reserved-bandwidth
> changed to be 80%,
> or will it be changed to be 100% ?
=====
-- Scott Savage
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