Weighted roud robin queuing question ( WRR)

[sarahr202]

Hi everybody.

Long time no see ; I have been quite busy at work, hope everybody is fine.

R1 gig1/1------100M CIR--Service provider.

Above we are using policer of 100M outbound on gig1/1.  

Assume  we have 4 traffic class and each of them is configured weight 20 . i,e each traffic class will get 20 percent of BW. in times of full congestion.

Does the BW above refer to bandwidth defined  using bandwidth command i.e 1000M under gig1/1  or policer's rate of 100M?

Much appreciated and have a great evening:)

[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.

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

If you're policing, and not shaping, WRR won't engage.

[sarahr202]

Thanks for your response Joseph.

I apologize but could you confirm following:

if we do not define or politer/shaper  on an interface, WRR will not work, we will end up FIFO.

Thanks.

[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 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

It depends on a device.

Queuing, like WRR, requires congestion (and a device that supports and enables it).  The congestion might be physical, the interface, or logical, a shaper.

A policer wouldn't "trigger" WRR because it doesn't queue traffic it just immediately drops the excess.