04-23-2013 06:42 AM - edited 03-04-2019 07:41 PM
Is this possible?
Scenario: Four QoS classes defined:
Class A
bandwidth percent 50
Class B
bandwidth percent 10
Class C
bandwidth percent 6
Class Default
If Class B needs additional b/w (bandwidth), and Class A is currently being used at a fraction of the 50%, do Cisco routers have the capability of configuring for automatic bandwidth adjustments so that Class B "temporarily" increases to a higher b/w percentage (using either resources for Class A or Class Default), and returns that b/w to the original class when Class B no longer needs it or the original class (higher priority) does need it?
Would the "fair-queue" command help with this? (see example)
class A
bandwidth percent 50
fair-queue
class B
bandwidth percent 10
fair-queue
class C
bandwidth percent 6
fair-queue
class Default
Thanks for any assistance.
04-23-2013 10:06 AM
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Posting
If Class B needs additional b/w (bandwidth), and Class A is currently being used at a fraction of the 50%, do Cisco routers have the capability of configuring for automatic bandwidth adjustments so that Class B "temporarily" increases to a higher b/w percentage (using either resources for Class A or Class Default), and returns that b/w to the original class when Class B no longer needs it or the original class (higher priority) does need it?
Yes, with your defined policy Class B will "borrow" unused bandwidths from other classes.
Would the "fair-queue" command help with this? (see example)
No, although FQ offers the advantages of proportional bandwidth sharing between flows within the same class and avoid synchronized tail drop for all the flows within the same class.
04-25-2013 08:57 AM
And the best way to implement this scenario would be to use CBWFQ?
04-25-2013 10:26 AM
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 whatsoever (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
Unsure I understand your "scenario" as you asked about CBWFQ behavior in one situation.
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