Hi,
My setup is as follows: 3560 access switch (Version 12.2(53)SE2), 4500 core switch (Version 12.2(53)SG4)--> Telco hosted 3845 router
We have an Vx issue and I want to ensure I've got end to end QoS for VoIP setup correctly, my configuration for each interface is below, there are some differences on the way 'auto qos trust voip' adds commands to the interfaces (Highlighted in red) that I am not sure about, should settings be the same throughout?
The Vx problem we are having is when a user calls a client, the phone mutes for a brief period, several attempts later the client can hear the caller. I am wondering if it's coinicidence it happens when the Business queue is maxed to capacity and the Vx traffic is not traversing the real-time queue because of a configuration error?
I have spanned a Cisco 7941 off to Wireshark, the DiffServ shows a DSCP value of 0x2e, so it is tagged correctly. I also do this on the trunk to the 3845 and we get the same DSCP value. So in this respect, I believe our internal network is keeping the packets tagged correctly from end-end.
Access port on 3560
interface GigabitEthernet0/1
switchport access vlan 16
switchport voice vlan 17
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
priority-queue out
mls qos trust device cisco-phone
mls qos trust dscp
auto qos voip cisco-phone
spanning-tree portfast
3560 Trunk to 4500
interface GigabitEthernet0/49
switchport trunk encapsulation dot1q
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
priority-queue out
mls qos trust dscp
auto qos voip trust
macro description cisco-switch
spanning-tree link-type point-to-point
4500 Trunk to 3560
interface GigabitEthernet3/36
description Trunk to NET20
switchport trunk encapsulation dot1q
switchport mode trunk
qos trust dscp
auto qos voip trust
macro description cisco-switch
tx-queue 3
priority high
shape percent 33
spanning-tree link-type point-to-point
service-policy output autoqos-voip-policy
Vx Router
interface GigabitEthernet3/46
description 3845 Vx Router
switchport access vlan 14
switchport mode access
qos trust dscp
auto qos voip trust
macro description cisco-switch
tx-queue 3
priority high
shape percent 33
spanning-tree link-type point-to-point
service-policy output autoqos-voip-policy
Any advice would be appreciated!
Brendan
