Total Output Drop on C2960G interface

Hi Experts,

Anyone used to face the problem like me as following ?

My C2960G-48TC-L is experiencing with increasing Number of "Total output
drops",

The currunt port configuration is

interface GigabitEthernet0/42

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

This port connecting Juniper ISG1000.

GigabitEthernet0/42 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 001e.79b5.98aa (bia 001e.79b5.98aa)
  Description:
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 91/255, rxload 72/255
  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 00:47:00
  Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 13973
  Queueing strategy: fifo
  Output queue: 0/4096 (size/max)
  5 minute input rate 283709000 bits/sec, 81227 packets/sec
  5 minute output rate 360446000 bits/sec, 91608 packets/sec
     221238391 packets input, 91509183985 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
     251606682 packets output, 119990227117 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

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 over subscribed 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

C2960G#show controllers utilization
Port Receive Utilization Transmit Utilization
Gi0/1 0 1
Gi0/2 0 0
Gi0/3 0 0
Gi0/4 0 0
Gi0/5 0 1
Gi0/6 0 0
Gi0/7 0 1
Gi0/8 0 0
Gi0/9 0 1
Gi0/10 0 0
Gi0/11 0 0
Gi0/12 0 0
Gi0/13 0 0
Gi0/14 0 0
Gi0/15 0 0
Gi0/16 0 0
Gi0/17 0 0
Gi0/18 5 4
Gi0/19 0 0
Gi0/20 0 0
Gi0/21 0 0
Gi0/22 0 0
Gi0/23 0 0
Gi0/24 0 0
Gi0/25 0 0
Gi0/26 4 5
Gi0/27 0 0
Gi0/28 0 0
Gi0/29 0 0
Gi0/30 3 0
Gi0/31 4 0
Gi0/32 3 2
Gi0/33 0 0
Gi0/34 0 0
Gi0/35 0 0
Gi0/36 0 0
Gi0/37 0 0
Gi0/38 0 0
Gi0/39 0 0
Gi0/40 0 0
Gi0/41 0 0
Gi0/42 35 49
Gi0/43 8 20
Gi0/44 26 3
Gi0/45 0 0
Gi0/46 0 0
Gi0/47 0 0
Gi0/48 0 0

Total Ports : 48
Switch Receive Bandwidth Percentage Utilization : 1
Switch Transmit Bandwidth Percentage Utilization : 1

Switch Fabric Percentage Utilization : 1

C2960G#show controllers gigabitEthernet 0/42 utilization
Receive Bandwidth Percentage Utilization : 39
Transmit Bandwidth Percentage Utilization : 51

Best regards,

Satit Chanoupragan

Blogs and organic groups at http://www.ccie.net
Received on Sun Oct 24 2010 - 11:10:49 ART