03-17-2010 06:31 AM - edited 03-06-2019 10:10 AM
hello,
had a question regarding the configuration of the ingree-queue on a 3560. Here is the configuration from my switch
mls qos srr-queue input threshold 1 8 16
mls qos srr-queue input threshold 2 34 66
mls qos srr-queue input dscp-map queue 1 threshold 3 0 1 2 3 4 5 6 7
mls qos srr-queue input dscp-map queue 1 threshold 3 32
mls qos srr-queue input dscp-map queue 2 threshold 1 16 17 18 19 20 21 22 23
mls qos srr-queue input dscp-map queue 2 threshold 2 33 34 35 36 37 38 39 48
mls qos srr-queue input dscp-map queue 2 threshold 2 49 50 51 52 53 54 55 56
mls qos srr-queue input dscp-map queue 2 threshold 2 57 58 59 60 61 62 63
mls qos srr-queue input dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31
mls qos srr-queue input dscp-map queue 2 threshold 3 40 41 42 43 44 45 46 47
i believe this is the default configuration generated by auto-qos. here is the output from a show mls qos input-queue command
Queue : 1 2
----------------------------------------------
buffers : 67 33
bandwidth : 90 10
priority : 0 10
threshold1: 8 34
threshold2: 16 66
so my question is if i have only two threshold configured for each queue, how come the switch put certain dscp values in queue 2 threshold 3. check the highlighted lines. its really confusing me.
thanks.
Solved! Go to Solution.
03-17-2010 06:43 AM
Hi
You have 3 thresholds :-)
Two configurable; and one implicit one - the end of the queue.
So for queue 1 in your output -
Thresh 1 - 8
Thresh 2 - 16
Thresh 3 - 100% of available buffer space.
Regards
Aaron
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03-17-2010 06:43 AM
Hi
You have 3 thresholds :-)
Two configurable; and one implicit one - the end of the queue.
So for queue 1 in your output -
Thresh 1 - 8
Thresh 2 - 16
Thresh 3 - 100% of available buffer space.
Regards
Aaron
Please rate helpful posts...
03-17-2010 07:16 AM
that clears all the confusion.
thanks.
03-17-2010 07:28 AM
Well - probably clears some of it.
There'll be more
I like to think I know a thing or two but they don't make it simple!
01-28-2016 03:49 AM
Hi,
Is there any difference in Qos configuration of 37xx series switches and 45XX ,65xx?
can anyone clarify ?
For Qos what parameters are the most important?
01-28-2016 05:04 AM
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Posting
Yes, QoS configurations differ, as often do the supported QoS features. Additionally, with the chassis devices, QoS features may vary based on installed line card(s) and/or supervisor (and sometimes QoS version too).
As to which QoS parameters are most important, that would be an "it depends" answer.
03-17-2010 07:20 AM
aqdas,
it is very easy to get confused with Qos.
The ingress queue has a total of 4 queues. The first 2 are used internally by the system for inter-stack communication and priority packets originated from the CPU. Out of the 4 queues, only 2 may be configured. One queue is priority by default, which has bigger priority weight. The other qeueue is the normal queue used of rtraffic that is considered to be best effort. within each of the queues are 3 weighted tail drop threasholds with that allow for 2 threasholds to be configured and the third fixed at 100%.
Francisco
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