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Problem with Qos on 2960 Catalyst

nhksocgen1
Level 1
Level 1

Hi guys,

I have packet loss with QoS configured and I was wondering is it somehow connected with the QoS configured on the switch.The traffic is passing through fa0/19 and gi0/1 interfaces.

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

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

interface FastEthernet0/19

switchport trunk native vlan 2

switchport mode trunk

srr-queue bandwidth share 10 10 60 20

priority-queue out

mls qos trust cos

macro description cisco-switch

auto qos voip trust

spanning-tree link-type point-to-point

interface GigabitEthernet0/2

switchport trunk native vlan 2

switchport mode trunk

srr-queue bandwidth share 10 10 60 20

queue-set 2

priority-queue out

mls qos trust cos

macro description cisco-switch

auto qos voip trust

spanning-tree link-type point-to-point

I was wondering if I remove the QoS interface statements on both interfaces won't solve this?Something like:

no srr-queue bandwidth share 10 10 60 20

no queue-set 2

no priority-queue out

no mls qos trust cos

no auto qos voip trust

Thank you very much.

Best regards,

Nikolay

2 Replies 2

siddhartham
Level 4
Level 4

Hi Nikolay,

What led you to think that the packet loss is due to QoS?, did you observer any congestion on thoses ports?

You can use the below 2 commands to remove qos config from the ports

no mls qos trust cos

no auto qos voip trust

global config command

no mls qos

Siddhartha

Siddhartha

Hi Siddhartha,

Thanks for your replay. I din't observred congestion on the ports.

When removed the interface setting the things went a bit better - like 10 packets lost from 100000.

I was wondering - mls qos enables it globally and if I have removed it from the interfaces it won't affect those interfaces with qos removed, am I right?

Many thanks!

Nik

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