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qos question

dkblee
Level 1
Level 1

hi! currently i've a few c3560 switches in

our environment. There isnt' any qos configured and the interface of

the switch is configured as below:

Interface GigaEthernet0/x

switchport access vlan xx

switchport mode access

switchport voice vlan xx

no mdix auto

spanning-tree portfast.

It works fine with the cisco ip phone now. I'm trying to put in some qos with the command "auto qos voip cisco-phone" in the interfaces. My question is what impact will i have? Will it affect the current voice quality? I tried this on the test switch, and there are alot of command automatically generated as below.....I tried to do a no auto qos voip cisco-phone on one of the interface (this command is totally removed in the interfaces), but these command below is still there. Will it affect any voice function in real life? Thanks.

mls qos map policed-dscp  24 26 46 to 0
mls qos map cos-dscp 0 8 16 24 32 46 48 56
mls qos srr-queue input bandwidth 90 10
mls qos srr-queue input threshold 1 8 16
mls qos srr-queue input threshold 2 34 66
mls qos srr-queue input buffers 67 33
mls qos srr-queue input cos-map queue 1 threshold 2  1
mls qos srr-queue input cos-map queue 1 threshold 3  0
mls qos srr-queue input cos-map queue 2 threshold 1  2
mls qos srr-queue input cos-map queue 2 threshold 2  4 6 7
mls qos srr-queue input cos-map queue 2 threshold 3  3 5
mls qos srr-queue input dscp-map queue 1 threshold 2  9 10 11 12 13 14 15
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

2 Replies 2

lgijssel
Level 9
Level 9

Auto qos works rather well on the 3560.

The only reasons not to use it are because your qos requirements are more extensive or more complex.

You'd better be a qos expert before attempting this path.

regards,

Leo

hi! basically, the auto qos shd work fine unless i've more complex requirements, is that right?

thx.