QoS not working

mtechnology · ‎06-11-2007

I have a 3750 stack of 2 switches and have configured the following QoS configurations on them.

There are avaya phones connected to these switches. The QoS doesn't seem to be working.. am i missing something

i do not see any ACL matches nor do see packets matching the policy map

Here is my configuration

mls qos

!

mls qos map cos-dscp 0 8 18 26 34 46 48 56

!

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

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

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

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

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

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

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

!

mls qos srr-queue output dscp-map queue 1 threshold 3 46 40

mls qos srr-queue output dscp-map queue 2 threshold 3 48 56

mls qos srr-queue output dscp-map queue 2 threshold 2 24 26 28 30

mls qos srr-queue output dscp-map queue 2 threshold 1 32 34 36 38

mls qos srr-queue output dscp-map queue 3 threshold 3 16 18 20 22

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

mls qos srr-queue output dscp-map queue 4 threshold 1 8 10

!

mls qos queue-set output 1 threshold 2 75 85 50 400

mls qos queue-set output 1 threshold 4 15 100 50 400

ip access-list extended VOICE

permit udp 172.16.220.0 0.0.0.127 any range 16384 32767

class-map match-all VOICE

match access-group name VOICE

policy-map VOICE-ACCESS

class VOICE

set ip dscp ef

interface range FastEthernet1/0/1 - 48

switchport access vlan 2

switchport trunk encapsulation dot1q

switchport trunk native vlan 2

switchport mode trunk

switchport voice vlan 20

service-policy input VOICE-ACCESS

thnaks in advance

bvsnarayana03 · ‎06-11-2007

add this cmd to all the interfaces to which voip phones are connected:

"mls qos-trust dscp"

Chk if this helps, as it servd my purpose in similar case.

edgar.reinke · ‎07-22-2007

You have to find another way to check your configuration. On most switches the qos related ACL and the show policy-map interface command do not show any counters. Seems to be the price we have to pay for hardware based qos ...

KR,

Edgar

edgar.reinke · ‎07-22-2007

... but you can use the command and check for the values.

Do not follow the advise to configure command on the interface, because this will remove your service-plicy from the interface: You can trust, or set the dscp bits ... but not both.

Edgar