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Total output drop

Hi,

I found increase of Total output drop when i monitor status of interface but i didn't found any parameter which affects to increase output drop.
I can't explain to clients about this. (I use C2960G-48TC-L). Which cause have affects to increase total output drops?

GigabitEthernet0/42 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 001e.79b5.98aa (bia 001e.79b5.98aa)
  Description: WLS-NSFW-02 - Eth 3/1
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 84/255, rxload 65/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters 16:12:53
  Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 90042
  Queueing strategy: fifo
  Output queue: 0/4096 (size/max)
  5 minute input rate 254921000 bits/sec, 76342 packets/sec
  5 minute output rate 331583000 bits/sec, 86074 packets/sec
     2878439506 packets input, 1187887325730 bytes, 0 no buffer
     Received 0 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
     3241772728 packets output, 1520886417289 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
     0 output buffer failures, 0 output buffers swapped out

4 REPLIES

Re: Total output drop

Hello,

Please tell us what IOS version are you using. Also it would be helpful to know how is the interface configured. From this output I see it's a L2 interface, but that's it.

Cheers,

Calin

Re: Total output drop

Hi,

One other thing to look at is if you have a QoS configruation on the box?

Many thanks

Jonathan

Re: Total output drop

Rojer,

Here is a good document on troubleshooting Output drops.

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml

Hope this helps,

Mike

New Member

Re: Total output drop

Hi folks,

Let's me introduce myself, I'm working this case with Rojer-bkk.

I have more information here,


IOS version : 12.2(44)SE

port configuration

interface GigabitEthernet0/42

switchport mode trunk
hold-queue 4096 in
hold-queue 4096 out

This port connected to Non-Cisco device.

MLS QOS not yet globally enabled.


Anyone, please answer me,

Even, MLS QOS not yet enabled,

Does this problem related to ASIC Egress Queue or not ?

Can i solve by changing queue-set's threshold ?

mls qos queue-set output 1 threshold 4 400 400 50 400

If yes, can you reccomend this threshold value ?

------------------------------

I'm suspect on Egress ASIC queue is exhausting or not ,

Let's see this output command.

C2960G#show mls qos interface gigabitEthernet 0/42 statistics
GigabitEthernet0/42 (All statistics are in packets)

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

  0 -  4 :  3187746198            0   4254333459            0     31422903 
  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            0 
25 - 29 :           0            0            0            0            0 
30 - 34 :           0            0            0            0            0 
35 - 39 :           0            0            0            0            0 
40 - 44 :           0            0            0            0            0 
45 - 49 :           0            0            0      3800999            0 
50 - 54 :           0            0            0            0            0 
55 - 59 :           0            0            0            0            0 
60 - 64 :           0            0            0            0 
  dscp: outgoing
-------------------------------

  0 -  4 :  2747292853            0    236493558            0     32115386 
  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            0 
25 - 29 :           0            0            0            0            0 
30 - 34 :           0            0            0            0            0 
35 - 39 :           0            0            0            0            0 
40 - 44 :           0            0            0            0            0 
45 - 49 :           0            0            0     16655381            0 
50 - 54 :           0            0            0            0            0 
55 - 59 :           0            0            0            0            0 
60 - 64 :           0            0            0            0 
  cos: incoming 
-------------------------------

  0 -  4 :  3226787070            0            0            0            0 
  5 -  7 :           0            0            0 
  cos: outgoing
-------------------------------

  0 -  4 :  3051430973            0       529583            0            0 
  5 -  7 :           0      3998432       315848 
Policer: Inprofile:            0 OutofProfile:            0


C2960G# show platform port-asic stats drop gigabitEthernet 0/42

  Interface Gi0/42 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 43279243

C2960G#show mls qos interface gigabitEthernet 0/42 buffers
GigabitEthernet0/42
QoS is disabled. When QoS is enabled, following settings will be applied
The port is mapped to qset : 1
The allocations between the queues are : 25 25 25 25


C2960G#show 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

Best regards,

Satit  Chanoupragan

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