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troubleshooting Question

Auto Qos question

Avatar of techlinden
techlindenFlag for United States of America asked on
Switches / HubsNetwork Operations
1 Comment1 Solution243 ViewsLast Modified:
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
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