4.6.1 Checking the queuing priority

The figure below shows how to check the queuing priority.

In this example, the applicable Ethernet interface is port 1/0/2.

Confirm that Qlen of Queue6 is 2880 or so when traffic is injected into the line.

Figure 4-8: Checking the queuing priority
> show qos queueing 1/0/2 Date 20XX/03/01 13:00:00 UTC Switch1/NIF0/Port2 (outbound) Max_Queue=12, Rate_limit=20Mbit/s, Burst_size=4kbyte, Qmode=pq/tail_drop Queue 1: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 2: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 3: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 4: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 5: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 6: Qlen= 2160, Limit_Qlen= 2880, HOL1= 18 ..1,2 Queue 7: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 8: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 9: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 10: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 11: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Queue 12: Qlen= 0, Limit_Qlen= 2880, HOL1= 0 Tail_drop= 18 ..2

Figure 4-8: Checking the queuing priority

> show qos queueing 1/0/2
Date 20XX/03/01 13:00:00 UTC
Switch1/NIF0/Port2 (outbound)
 Max_Queue=12, Rate_limit=20Mbit/s, Burst_size=4kbyte, Qmode=pq/tail_drop
  Queue  1: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue  2: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue  3: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue  4: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue  5: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue  6: Qlen= 2160, Limit_Qlen= 2880, HOL1=        18   ..1,2
  Queue  7: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue  8: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue  9: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue 10: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue 11: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
  Queue 12: Qlen=    0, Limit_Qlen= 2880, HOL1=         0
 Tail_drop=        18                                       ..2

Make sure that the Qlen value for Queue6 has a count value.
Make sure that the Qlen value is 75 % of the Limit_Qlen value and that the Tail_drop counter for dropped packets has been incremented.