I'm a noob when it comes to QoS and I have been doing a good bit of reading and testing lately with QoS. Right now in our environment all of our PoE switches are 2960S switches, we also have all Cisco VoIP phones (7942, 7945s). So the 2960s connect via layer 2 to our 4507 switch. I have an interface coming off of the 4507 (no switchport) with an IP address assigned that connects to our MPLS router. I have been reading that mls qos trust qos on the 2960 ports isn't needed since they aren't trust ports so I have switched those over to mls qos trust dscp. ohh FYI, I am using the auto qos voip cisco-phone command on the 2960's and on the 4507. So here is an example of a switchport on the 2960:
interface GigabitEthernet1/0/4
switchport access vlan 240
switchport mode access
switchport voice vlan 720
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust device cisco-phone
mls qos trust dscp
auto qos voip cisco-phone
spanning-tree portfast
service-policy input AutoQoS-Police-CiscoPhone
Here is an example of the trunk on the 2960 connecting to the 4507. I matched CoS here since this is a trunk port? I may be completely off here.
interface GigabitEthernet1/0/49
description TRUNK BACK TO CORE
switchport trunk native vlan 5
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
service-policy input AutoQoS-Police-CiscoPhone
ip dhcp snooping trust
On my 4507, it is using this QoS policy.
class-map match-all AutoQos-VoIP-Control-Dscp26
match dscp af31
class-map match-all AutoQos-VoIP-Control-Dscp24
match dscp cs3
class-map match-all AutoQos-VoIP-Bearer-Cos
match cos 5
class-map match-all AutoQos-VoIP-Control-QosGroup24
match qos-group 24
class-map match-all AutoQos-VoIP-Control-QosGroup26
match qos-group 26
class-map match-all AutoQos-VoIP-Bearer-QosGroup
match qos-group 46
class-map match-all AutoQos-VoIP-Bearer-Dscp
match dscp ef
class-map match-all AutoQos-VoIP-Control-Cos
match cos 3
!
policy-map AutoQos-VoIP-Input-Cos-Policy
class AutoQos-VoIP-Bearer-Cos
set qos-group 46
class AutoQos-VoIP-Control-Cos
set qos-group 24
policy-map AutoQos-VoIP-Input-Dscp-Policy
class AutoQos-VoIP-Bearer-Dscp
set qos-group 46
class AutoQos-VoIP-Control-Dscp26
set qos-group 26
class AutoQos-VoIP-Control-Dscp24
set qos-group 24
policy-map AutoQos-VoIP-Output-Policy
class AutoQos-VoIP-Bearer-QosGroup
set dscp ef
set cos 5
priority
police cir percent 33
class AutoQos-VoIP-Control-QosGroup26
set dscp af31
set cos 3
bandwidth remaining percent 5
class AutoQos-VoIP-Control-QosGroup24
set dscp cs3
set cos 3
bandwidth remaining percent 5
class class-default
dbl
Here is the config from a switchport on the 4507 that trunks to the 2960 PoE switches.Again I am matching CoS here because of the Trunk.
interface GigabitEthernet1/9
description TRUNK TO 10PoESW-Z1
switchport trunk native vlan 5
switchport mode trunk
auto qos voip trust
service-policy input AutoQos-VoIP-Input-Cos-Policy
service-policy output AutoQos-VoIP-Output-Policy
ip dhcp snooping trust
Does this look right so far?
