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High Windows Output Queue Length

We're having an issue where we are seeing high output queue lengths on many of our windows server hosts connected to a 3560 switch. The queue will often times be above 5 or 10 deep with .01% utilization on the NIC.

The servers have been swapped, drivers updated, cables and ports changed, but the problem still exists. Is there anything on the switch that may cause this? Our next step is to upgrade the ios, but it's on our production DMZ, so I want to rule everything out before we drop the network.

Thanks in advance,


Also, here's a sho ver

Cisco IOS Software, C3560 Software (C3560-ADVIPSERVICESK9-M), Version 12.2(25)SE


Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Tue 30-Aug-05 17:56 by yenanh

ROM: Bootstrap program is C3560 boot loader

BOOTLDR: C3560 Boot Loader (C3560-HBOOT-M) Version 12.2(25r)SE1, RELEASE SOFTWAR

E (fc)

dmzsw001 uptime is 31 weeks, 2 days, 21 hours, 32 minutes

System returned to ROM by power-on

System restarted at 22:00:12 EDT Tue Aug 19 2008

System image file is "flash:/c3560-advipservicesk9-mz.122-25.SEB4.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

cisco WS-C3560G-48TS (PowerPC405) processor (revision C0) with 118784K/12280K by

tes of memory.

Processor board ID FOC1020Y2S9

Last reset from power-on

4 Virtual Ethernet interfaces

52 Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address : 00:18:18:7B:F1:00

Motherboard assembly number : 73-9358-04

Power supply part number : 341-0107-01

Motherboard serial number : FOC10201638

Power supply serial number : FXD10180058

Model revision number : C0

Motherboard revision number : A0

Model number : WS-C3560G-48TS-S

System serial number : FOC1020Y2S9

SFP Module assembly part number : 73-7757-03

SFP Module revision Number : A0

SFP Module serial number : CAT10171DN0

Top Assembly Part Number : 800-25428-02

Top Assembly Revision Number : B0

Version ID : V02

CLEI Code Number : CNMWY00ARB

Hardware Board Revision Number : 0x05

Switch Ports Model SW Version SW Image

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

* 1 52 WS-C3560G-48TS 12.2(25)SEB4 C3560-ADVIPSERVICESK

Configuration register is 0xF



Super Bronze

Re: High Windows Output Queue Length

I note many hard code speed/duplex ports. There are no duplex mismatches between switch and servers?


Could you also indicate an actual problem port and post switch stats for that port?