From: Jeff Andiorio (jandiorio@gmail.com)
Date: Wed Mar 25 2009 - 08:54:35 ART
Only the first 2 threshholds are configurable is my understanding.
Jeff
On Tue, Mar 24, 2009 at 9:51 PM, Pavel Bykov <slidersv@gmail.com> wrote:
> Your undesrtanding of least-drop is correct. 3560 supports 2Q3T or 1P1Q3T
> ingress queuing.
> But your configuration is not complete.
> By default, thresholds 1,2 and 3 are assigned 100% buffers.
> So to differentiate between them, say so th1 is dropped first, then if there
> is a lot more traffic still, th2 will be dropped first, and only then th3
> will be dropped. (meaning, not dropped at all, unless there is too much
> traffic in assigned th3 as well - DSCP 40 and 46 in your case)
>
> This means, use a command something like
>
> mls qos srr-queue input threshold 2 60 80 100
>
> This will assign:
> Q2T1 = can use up to 60% of buffers
> Q2T2 = can use up to 80% of buffers
> Q2T3 = can use up to 100% of buffers (default, you don't have to type 100).
>
> Actually, i'm not sure if you will be able to type the last 100. You may
> only be able to enter "mls qos srr-queue input threshold 2 60 80", sine 100
> is by default, and as you write "queue-full" meaning nothing can exist in
> the queue over this threshold. Maybe it's implicitly set at 100 and is non
> configurable... unfortunately can't test right now because it's almost 3
> am...
>
>
> On Tue, Mar 24, 2009 at 4:24 PM, Hunt, Richard (LDN-GIS) <
> Richard.Hunt@interpublic.com> wrote:
>
>> Hi,
>> Just been setting up QoS on 3560 and wonderd if anyone knew the answer to
>> this
>> question about srr-queue input dscp-map.
>>
>> Here's the config line:
>> mls qos srr-queue input dscp-map queue 2 threshold 3 40 46
>>
>> Here's what I think I'm doing. I think that this will map DSCP 40 & 46 to
>> input queue number 2 in the last of the 3 thresholds for weighted tail
>> drop?
>> Now as I understand it, threshold 1 & 2 are configurable and I am
>> comfortable
>> with that, which is nice. Threshold 3 however is documented in some places
>> as
>> the "queue-full" threshold. This is a little cryptic to me, I am hoping
>> it's
>> the queue least likely to suffer drops as it's my priority traffic.
>>
>> I notice that DSCP 46 and 40 amongst others are in this queue and threshold
>> by
>> default (I'm just running over it manually so that I can put others in if
>> needed) as seen here in an out of the box config
>>
>> Switch#sh mls qos maps dscp-input-q
>> Dscp-inputq-threshold map:
>> d1 :d2 0 1 2 3 4 5 6 7 8 9
>> ------------------------------------------------------------
>> 0 : 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01
>> 1 : 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01
>> 2 : 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01
>> 3 : 01-01 01-01 01-01 01-01 02-02 01-01 01-01 01-01 01-01 01-01
>> 4 : 02-03 02-01 02-01 02-01 02-01 02-01 02-03 02-01 01-01 01-01
>> 5 : 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01
>> 6 : 01-01 01-01 01-01 01-01
>>
>> Other DSCP values look after themselves as above.
>> The question is about threshold 3 of the input queues and how it works as
>> opposed to threshold 1 & 2
>>
>> Thanks in advance
>> Richard.
>>
>>
>>
>>
>>
>>
>>
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>
>
> --
> Pavel Bykov
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