Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Your question seems CBWFQ related, and as noted by Philip, there can be platform (and IOS version) differences, such as with class bandwidth allocations.
if I have with the command bandwidth, class A 30%, class B 30% and class C 20%, the default will have 20% right?
That varies, for example, pre-HQF, by default, non-default classes, combined, could not allocate more than 75%. Class default didn't require an explicit bandwidth allocation, and if FQ was used, it wasn't directly capped by the class's bandwidth.
Post-HQF, I'm unsure what class default's "official" allocation is if not explicitly defined. If defined, is would be what's defined, although all the classes together don't need to sum to 100%. When they don't, I don't know how the "excess" is proportioned; it may vary across platforms.
BTW, what bandwidth settings really do is proportion bandwidth between classes, so (just) two classes of 3% would each be "guaranteed" 50% bandwidth.
the question is, the default class can take up to the 100% of the BW if the other classes are not using it?
Generally, unless there's a policer or shaper, classes are not limited by their bandwidth allowances, and any such class can use 100% of the bandwidth.
