Solved: Auto Qos question | Experts Exchange

If a port is configured with auto qos and has the command mls qos trust cos, but doesn't have a voice vlan meaning that the data and voice share the same subnet, does the ethernet frame still have a cos value in it. Show mls qos int seems to show that outbound voice traffic is being tagged with cos value 5. guess the question is why? cos value is in the 802.1p priority field in a 802.1q trunk frame. Without the voice vlan command are the voip frames still being encapsulated as 802.1q frames?

show mls qos int gi0/22 stat
GigabitEthernet0/22

dscp: incoming
-------------------------------

0 - 4 : 59320375 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 1560499
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 129330
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 164281 0 54011 0
50 - 54 : 4 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
-------------------------------

0 - 4 : 172446244 0 0 0 14358
5 - 9 : 0 0 0 4384 0
10 - 14 : 12 0 0 0 12
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 995305
25 - 29 : 0 99 0 0 0
30 - 34 : 0 0 0 0 2191
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 130187 0 2398742 0
50 - 54 : 3 0 0 0 5
55 - 59 : 0 321336 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
-------------------------------

0 - 4 : 62535124 0 0 0 0
5 - 7 : 0 0 0
cos: outgoing
-------------------------------

0 - 4 : 198418860 0 0 0 0
5 - 7 : 1624955 0 0