10-20-2009 08:33 AM - edited 03-06-2019 08:12 AM
I have a 3750 connected to a storage device and I am seeing alot of Total output drops on the input queue
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 76207
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 31734000 bits/sec, 4366 packets/sec
5 minute output rate 37218000 bits/sec, 4632 packets/sec
1784158 packets input, 1564949850 bytes, 0 no buffer
Received 1 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
1940220 packets output, 1986930582 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
I know you can increase the hold queue but that did not help either. I am using the lastest IOS c3750-ipservicesk9-mz.122-50.SE3. Would anyone have any suggestions ?
Thanks in advance
10-20-2009 08:43 AM
In general, output drop is caused by a busty traffic pattern. You can use the command "show platform port-asic stats drop gig x/y" to see which queue is dropping the packet. And then try to adjust your queue setting by related "mls qos queue-set output" commands.
10-21-2009 03:06 AM
Thanks for the reply. Here is the output
show platform port-asic stats drop gig 1/0/1
Interface Gi1/0/1 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 175458
sh mls qos queue-set
Queueset: 1
Queue : 1 2 3 4
----------------------------------------------
buffers : 25 25 25 25
threshold1: 100 200 100 100
threshold2: 100 200 100 100
reserved : 50 50 50 50
maximum : 400 400 400 400
Queueset: 2
Queue : 1 2 3 4
----------------------------------------------
buffers : 25 25 25 25
threshold1: 100 200 100 100
threshold2: 100 200 100 100
reserved : 50 50 50 50
maximum : 400 400 400 400
If I do sh mls-qos
QoS is disabled
QoS ip packet dscp rewrite is enabled
What be the best way to change these settings ?
Thanks
10-21-2009 11:54 AM
Hi.
First thing is to enable QoS, as it is currently disabled:
"If I do sh mls-qos
QoS is disabled"
HTH
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