QoS implementation question between core switch and access switch

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Jul 25th, 2007
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Hi,


Am working on implementing QoS in a building in our district. Which switches need this command: ?mls qos trust dscp? and what switch needs ?Auto Qos? enabled?


Here is the breakdown of this buildings network:

1 - Cat 3750 - core switch w/ IP routing enabled (only 12 gig ports)

4 - Cat 3560 - access switches with PoE ports for our phones and some data ports

4 - Cat 3550 - access switches - data ports

2 - Cat 2950 - access switches - data ports


Here is the auto QoS config from the Cat3560 ? an access layer switch.

mls qos map cos-dscp 0 8 16 26 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

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

mls qos srr-queue output cos-map queue 1 threshold 3 5

mls qos srr-queue output cos-map queue 2 threshold 3 3 6 7

mls qos srr-queue output cos-map queue 3 threshold 3 2 4

mls qos srr-queue output cos-map queue 4 threshold 2 1

mls qos srr-queue output cos-map queue 4 threshold 3 0

mls qos srr-queue output dscp-map queue 1 threshold 3 40 41 42 43 44 45 46 47

mls qos srr-queue output dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31

mls qos srr-queue output dscp-map queue 2 threshold 3 48 49 50 51 52 53 54 55

mls qos srr-queue output dscp-map queue 2 threshold 3 56 57 58 59 60 61 62 63

mls qos srr-queue output dscp-map queue 3 threshold 3 16 17 18 19 20 21 22 23

mls qos srr-queue output dscp-map queue 3 threshold 3 32 33 34 35 36 37 38 39

mls qos srr-queue output dscp-map queue 4 threshold 1 8

mls qos srr-queue output dscp-map queue 4 threshold 2 9 10 11 12 13 14 15

mls qos srr-queue output dscp-map queue 4 threshold 3 0 1 2 3 4 5 6 7

mls qos queue-set output 1 threshold 1 138 138 92 138

mls qos queue-set output 1 threshold 2 138 138 92 400

mls qos queue-set output 1 threshold 3 36 77 100 318

mls qos queue-set output 1 threshold 4 20 50 67 400

mls qos queue-set output 2 threshold 1 149 149 100 149

mls qos queue-set output 2 threshold 2 118 118 100 235

mls qos queue-set output 2 threshold 3 41 68 100 272

mls qos queue-set output 2 threshold 4 42 72 100 242

mls qos queue-set output 1 buffers 10 10 26 54

mls qos queue-set output 2 buffers 16 6 17 61

mls qos

!

!


(text deleted)

!

interface FastEthernet0/1

description VLAN 110: IP phone

power inline never

switchport access vlan 110

switchport mode access

srr-queue bandwidth share 10 10 60 20

srr-queue bandwidth shape 10 0 0 0

mls qos trust device cisco-phone

mls qos trust cos

auto qos voip cisco-phone

spanning-tree portfast

!

interface FastEthernet0/2

description VLAN 110: IP phone

power inline never

switchport access vlan 110

switchport mode access

srr-queue bandwidth share 10 10 60 20

srr-queue bandwidth shape 10 0 0 0

mls qos trust device cisco-phone

mls qos trust cos

auto qos voip cisco-phone

spanning-tree portfast


Should Auto Qos be enabled on each switch that supports it?

Thanks for any help

Dan

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mchoo2005 Wed, 07/25/2007 - 18:08
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I also recommend "auto qos voip trust" configured on your 3560's uplink port to the 3750G-12S.


Do you also have CCM server connected somewhere? Or are you using CME?


trptplayer1 Wed, 07/25/2007 - 19:08
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Thanks for the tip. I'll put it in there tomorrow. By CCM do you mean cisco call manager. Or is CME - Call manager express?

Dan

trptplayer1 Wed, 07/25/2007 - 19:16
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I have "auto qos voip trus" configured on one of the 3560 switch's uplink ports. Do you think I need the massive config of auto qos --mls qos map....mls qos srr-queue input bandwidth....all of those commands generated from auto qos. Do I need those on the 3560 or on the 3750 Core switch?


A cisco engineer working on our other buildings in our district sent a sample config for a 3560 with these configs (a short config):


msl qos map cos-dscp 0 8 16 24 32 46 48 56

mls qos map ip-prec-dscp 0 8 1624 32 46 48 56

mls qos


(text deleted)


interface fa0/1

description ip phone

switchport access vlan110

switchport mode access

priority queue-out

mls qos trust dscp

spanning-tree portfast


We as a staff asked for help since he wasn't contracted to program this building.


What do you think of the above config?

Thanks,

Dan

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