[c-nsp] Output Drops Due to QoS and threshold size

Andrey Kostin ankost at podolsk.ru
Fri Apr 8 19:45:56 EDT 2016

Sorry that I'm not answering to original poster, but this message is 
for him

I just found in my old bookmarks this page:
which provide detailed example how enabled mls qos can decrease packet 
drops for specific type of traffic.
Some time ago I tested setup with 1G to 100M ports and also 2G 
Ether-channel to 1G port with different size of burst and confirm that 
you can get some improvement but only for temporary congestion or only 
one class of traffic.

Saku Ytti писал 07.04.2016 06:13:
> On 7 April 2016 at 07:26, Victor Sudakov <vas at mpeks.tomsk.su> wrote:
>> If Thres1 in Q1 is set to 1000%, this would mean 500 buffers. Where
>> are the 500-200=300 additional buffers borrowed? From the common 
>> pool?
> From the document
> ---
> Anything over 100% means the tx queue can use common buffers to queue
> packets.  The default value for this field is 400%.
> ---
> I've not worked with small cats in several years and I'm not ready to
> refresh my memory on them, as I don't expect needing to work on their
> QoS in future, sorry.

Kind regards,

Andrey Kostin

More information about the cisco-nsp mailing list