Help with QoS settings

[Mohit Kumar]

Hi All,

we have set the QoS in the following way. 

is the BW completely reserved under these classes and lying unused when there is no traffic under this categoty or the QoS will come into picture only when link BW will get overutilized?

Any help is appriciated.

class Premium-Class
  police rate percent 40
  priority
  set ip dscp ef

class Business-1-Class
  bandwidth percent 20
  random-detect dscp-based
  set ip dscp af31

class Business-2-Class
  bandwidth percent 20
  random-detect dscp-based
  set ip dscp af21

class Business-3-Class
  bandwidth percent 5
  random-detect dscp-based
  set ip dscp af11

class Management-Routing-Class
  bandwidth percent 5
  set ip dscp af41

class class-default
  bandwidth percent 10
  random-detect dscp-based
  set ip dscp default

Regards,

Mohit

[Joseph W. Doherty]

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.

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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

Generally, CBWFQ's bandwidth statement guarantee's a minimum; the bandwidth, if not used, is available to other classes.

Re: ". . . QoS will come into picture only when link BW will get overutilized?"  Bandwidth comes into effect when there's congestion, but policers (or shapers), such as the one you've defined within your Premium class, are active all the time.

[Mohit Kumar]

Hi Joseph,

Thanks for your reply.

Premium class bandwidth ie 40% is reserved for this class only and is not shared with other classes even if the link gets congested and we have no data in this class.

is it correct according to policers active all the time?

Regards,

Mohit

[Joseph W. Doherty · Accepted solution]

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

The class policer is active all the time, but it only polices that class's bandwidth, i.e. other classes use of unused bandwidth are still not impacted.

[Mohit Kumar]

Hi Joseph,

Thanks for clarifying.

Regards,

Mohit