From: Hunt, Richard (LDN-GIS) (Richard.Hunt@interpublic.com)
Date: Tue Mar 24 2009 - 12:24:03 ART
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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