Issue with millions of output discards on Cisco 3750

[Chris Knipe]

I am having the following issue with a WS-C3750G-24TS running ver 12.2(40)SE.  Our monitoring software continues to recieve hits on the output discards.  When I went to look at the port with a show int x/x/x you end up seeing about 9,000,000 discards.  Then repeat the command a few seconds later and it show 0.  Do it again and it is back up to the exact same number 934191963. It is always either this exact number or 0. When I do a show counters errors I show all 0's so I am sure my speed and duplex settings are correct.  This particular port is connected to a WAN Accelerator device and both sides have ther speeds set to 100 full duplex. Any idea how to resolve or diagnose this issue or where to look next?

GigabitEthernet1/0/1 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 0023.abfb.5ac3 (bia 0023.abfb.5ac3)
  Internet address is 23.192.0.217/29
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
  Media-type configured as  connector
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 6d04h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 934191963 **ALTERNATES BETWEEN THIS # AND 0 EVERY 2-3 SECONDS**
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 249000 bits/sec, 70 packets/sec
  5 minute output rate 70000 bits/sec, 59 packets/sec
     95320942 packets input, 71963324960 bytes, 0 no buffer
     Received 29 broadcasts (115844 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 125669 multicast, 0 pause input
0 input packets with dribble condition detected
     70561577 packets output, 23723539189 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

[Alvaro Garcia]

It seems you are being affected by this bug:

CSCsj53001 "Show interfaces showing wrong values for output drops" 

I would suggest to upgrade the IOS to anything above 12.2(44)SE

[Alvaro Garcia]

Hey Chris,... Im just wondering if you decided to upgrade the IOS on your switch...

regards

[Chris Knipe]

Unfortunately this is an always up environment So I am waiting to get approval on my outage window.  From other community posts I have found I am pretty confident this will solve the issue but I will update the thread by next week to ensure it has been resolved.  thanks again.

[Chris Knipe]

Just wanted to update everyone here that Im still waiting on my approvals to upgrade this switch so I have nothing to report yet.  per my mgmt, I went ahead and opened a ticket with Cisco who came up with the same solution.  Upon further review I found this issue also occuring on another port in which nothing was plugged into.  Everyone is somewhat taking the angle that its not happening on the other switches so why is it just happening here. Either way, im pretty sure the only way were getting around this issue is the upgrade and ill update you guys when I finally get all my ok's.

Thanks again.