Solved: Forced Full Duplex changes to Half Duplex (no mismatch errors)

f.korngut · ‎10-14-2011

Guys,

I am going through a very weird situation and wondered if any of you had any ideas on how I could troubleshoot this issue.

I am running a 2960 Cisco, which has a single mode fiber cable which is connected to multiple rstp switches designed by a mining technology company.

The fiber port which connects these switches has "duplex full" written into its configuration. However, after a random amount of time, anywhere from 1 hour to 24 hours, the port is changes to operate in half duplex. This is found by doing a show interfaces status.

At no time whatsoever is there any duplex mismatch errors.

Once i notice that the port is actually operating in half duplex mode, i log into the port, do a "duplex half" then "duplex full".. the port goes back into full duplex for another 1-24 hour period.

Any ideas on why this port keeps jumping into half duplex operation? I really need this port to run in full duplex and cannot understand why the port would go into half duplex operation when the end devices should support full duplex.

Again, i never get any duplex mismatch errors.

I appreciate any troubleshooting tips you can provide.

Leo Laohoo · ‎10-16-2011

Vendor Name           :   CISCO-SUMITOMO

Well, son-of-a-gun. I've never seen this vendor before. Looks like your SFP is legit.

My next suggestion would be to upgrade your IOS to 12.2(55)SE2 or later.

View solution in original post

Leo Laohoo · ‎10-14-2011

Can you post the following complete output please:

1. sh version;

2. sh cdp neighbor; and

3. sh inventory

f.korngut · ‎10-15-2011

MSTswitchOVCC#sh version

Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Compiled Wed 21-Apr-10 06:08 by prod_rel_team

Image text-base: 0x00003000, data-base: 0x01B00000

ROM: Bootstrap program is Alpha board boot loader

BOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(53r)SE, RELEASE SOFTWARE (fc3)

MSTswitchOVCC uptime is 1 week, 6 days, 37 minutes

System returned to ROM by power-on

System image file is "flash:/c2960s-universalk9-mz.122-53.SE2/c2960s-universalk9-mz.122-53.SE2.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:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

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

export@cisco.com.

cisco WS-C2960S-24TS-L (PowerPC) processor (revision B0) with 131072K bytes of memory.

Processor board ID FOC1435W6KX

Last reset from power-on

4 Virtual Ethernet interfaces

1 FastEthernet interface

28 Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.

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

Base ethernet MAC Address : AC:A0:16:F3:EF:00

Motherboard assembly number : 73-11910-06

Power supply part number : 341-0328-01

Motherboard serial number : FOC14354WTE

Power supply serial number : LIT142210AX

Model revision number : B0

Motherboard revision number : A0

Model number : WS-C2960S-24TS-L

Daughterboard assembly number : 73-11933-04

Daughterboard serial number : FOC1435437G

System serial number : FOC1435W6KX

Top Assembly Part Number : 800-30954-02

Top Assembly Revision Number : A0

Version ID : V02

CLEI Code Number : COMGG00ARB

Daughterboard revision number : A0

Hardware Board Revision Number : 0x01

Switch Ports Model SW Version SW Image

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

* 1 28 WS-C2960S-24TS-L 12.2(53)SE2 C2960S-UNIVERSALK9-M

Configuration register is 0xF

MSTswitchOVCC#

f.korngut · ‎10-15-2011

MSTswitchOVCC#sh cdp neighbor

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,

D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID Local Intrfce Holdtme Capability Platform Port ID

MikroTik Gig 1/0/22 110 R MikroTik bridge1

Centerville_POE Gig 1/0/9 167 R S I WS-C3560- Fas 0/3

MSTswitchOVCC#

PLEASE NOTE THAT PORTS 25-26 ARE THE ONLY PORTS THAT ARE AFFECTED.

f.korngut · ‎10-15-2011

MSTswitchOVCC#sh inventory

NAME: "1", DESCR: "WS-C2960S-24TS-L"

PID: WS-C2960S-24TS-L , VID: V02 , SN: FOC1435W6KX

NAME: "GigabitEthernet1/0/25", DESCR: "100BaseLX-FE SFP"

PID: , VID: , SN: AFL00352

NAME: "GigabitEthernet1/0/26", DESCR: "100BaseLX-FE SFP"

PID: , VID: , SN: AFL00351

MSTswitchOVCC#

PLEASE NOTE THAT PORT 25-26 ARE THE ONLY PORTS THAT ARE AFFECTED.

Leo Laohoo · ‎10-15-2011

What the ...? I've never seen that syntax of a serial number. Is that for real?

Can you post the output to the command: "sh idprom interface Gi 1/0/25" (and 1/0/26) please?

Y'know if those SFP are NOT "Cisco" branded then that could be the reason for the issue.

f.korngut · ‎10-16-2011

MSTswitchOVCC#sh idprom int gi 1/0/25

General SFP Information

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

Identifier : 0x03

Connector : 0x07

Transceiver : 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00

Encoding : 0x02

BR_Nominal : 0x01

Vendor Name : CISCO-SUMITOMO

Vendor Part Number : GLC-FE-100LX

Vendor Revision : 0x44 0x20 0x20 0x20

Vendor Serial Number : AFL00352

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

Other Information

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

Port asic num : 00

Port asic port num : 13

SFP presence index : 00

SFP iter cnt : 9752635

SFP failed oper flag : 0x00000000

IIC error cnt : 0

IIC error dsb cnt : 0

IIC max sts cnt : 5

Chk for link status : 01

Link status : 01

Autoneg enable : 01

Flow control Pause : 00

Flow control asymPause: 00

Duplex mode : 00

PcsInfo : 0x043F5C50

MacInfo : 0x043F5C38 0x043F5C30

AutoNeg : 0x043F5C30 0x043F5C38

SFF-8472 MSA EEPROM Data

===========================================

000 : 03 04 07 00 00 00 00 00 00 00

010 : 00 02 01 00 0A 64 00 00 00 00

020 : 43 49 53 43 4F 2D 53 55 4D 49

030 : 54 4F 4D 4F 20 20 00 00 00 5F

040 : 47 4C 43 2D 46 45 2D 31 30 30

050 : 4C 58 20 20 20 20 44 20 20 20

060 : 05 1E 00 70 00 1A 00 00 41 46

070 : 4C 30 30 33 35 32 20 20 20 20

080 : 20 20 20 20 30 39 30 38 32 36

090 : 36 46 00 00 00 9C 2C 00 11 09

100 : C1 85 49 B0 41 C3 43 79 A3 F2

110 : F1 89 ED 50 AC 00 00 00 00 00

120 : 00 00 00 00 4F 3E BB B4

YETI INTERNAL REGS

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

Location=0xEF600500 : Value=0x00

Location=0xEF600501 : Value=0x00

Location=0xEF600502 : Value=0x00

Location=0xEF600503 : Value=0x00

Location=0xEF600504 : Value=0x00

Location=0xEF600505 : Value=0x00

Location=0xEF600506 : Value=0x00

Location=0xEF600507 : Value=0x02

Location=0xEF600508 : Value=0x00

Location=0xEF600509 : Value=0x40

Location=0xEF60050A : Value=0x00

Location=0xEF60050B : Value=0x00

Location=0xEF60050C : Value=0x09

Location=0xEF60050D : Value=0x00

Location=0xEF60050E : Value=0x01

Location=0xEF60050F : Value=0x00

Location=0xEF600510 : Value=0x0F

yetiIICinited : Value=0x00000001

yetiIICLockPassCnt : Value=0

yetiIICLockFailCnt : Value=0

yetiIICLockApp : Value=35

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

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

MSTswitchOVCC#

Leo Laohoo · ‎10-16-2011

Vendor Name           :   CISCO-SUMITOMO

Well, son-of-a-gun. I've never seen this vendor before. Looks like your SFP is legit.

My next suggestion would be to upgrade your IOS to 12.2(55)SE2 or later.

f.korngut · ‎10-17-2011

Ok I downloaded the 12.2(58).... I will try installing that.

I noticed that I could have grabbed a version 15?

What is the difference between 12 and 15 ?

Thanks so much for your help.

Leo Laohoo · ‎10-17-2011

What is the difference between 12 and 15 ?

You want an "honest" answer or an answer?

I used to run the 15.0(1) IOS. Take note I posted "used to". I had to roll back to 12.2(55)SE2 because there's a bug with IOS 15.0(1). The bug has a potential memory leak and is triggered when the switch boots up even without a config.

I've been telling people who read my post to stay away from the 15.0(1)SE IOS until Cisco fixes the bug.

This is my honest answer.

Marvin Rhoads · ‎10-18-2011

Given a Cisco switch with a genuinie Cisco transceiver running a relatively recent IOS such as you are, I'd suspect much more strongly that there is an interoperability problem with the "multiple rstp switches designed by a mining technology company". Are you able to contact the company that built them for technical support?

f.korngut · ‎10-31-2011

I am happy to report that this problem has been resolved by upgrading the cisco switch to 12.2-58SE2.

Thanks so much for everyone's ideas and help.