I have a 6500 that does not have 'mls qos' global configured, although the interfaces do have 'mls qos trust dscp' on them as in:
interface GigabitEthernet3/3
switchport
switchport access vlan 536
switchport mode access
switchport voice vlan 910
logging event link-status
mls qos trust dscp
spanning-tree portfast
When I 'show queueing int gx/x', it does show the default queueing structure of the interface as in:
LLT-6509AS-A#sh queueing int g3/3
Interface GigabitEthernet3/3 queueing strategy: Weighted Round-Robin
QoS is disabled globally
Port is untrusted
Extend trust state: not trusted [COS = 0]
Default COS is 0
Queueing Mode In Tx direction: mode-cos
Transmit queues [type = 1p3q8t]:
Queue Id Scheduling Num of thresholds
-----------------------------------------
01 WRR 08
02 WRR 08
03 WRR 08
04 Priority 01
---- snip ----
queue thresh cos-map
---------------------------------------
1 1 0 1 2 3 4 5 6 7
1 2
1 3
1 4
1 5
1 6
1 7
1 8
Packets dropped on Transmit:
BPDU packets: 0
queue dropped [cos-map]
---------------------------------------------
1 0 [0 1 2 3 4 5 6 7 ]
2 0 []
3 0 []
4 0 []
Packets dropped on Receive:
BPDU packets: 0
queue dropped [cos-map]
---------------------------------------------
1 0 [0 1 2 3 4 5 6 7 ]
So just what does the global 'mls qos' do? Without it is the command 'mls qos trust dscp' ignored?
I'm trying to track down where in our network dscp settings are being stripped out of packets and this is when I noticed the 'mls qos' was not configured.
