CRC/input error/38157997 symbol errors/..issue with 3750 stack master

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Mar 17th, 2010
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Hi all,

We are experiencing the CRC errors on master stack switch ports and LED's on ports are getting changed from amber to green and vice versa. Because of that we are getting the packet drops (loss).

i have changed the fiber cable also but problem still exist.

I checked show post and it show averythink is fine...

When checked in output interpretur ... it shows below error and recommendation


SHOW CONTROLLERS GIGABIT ETHERNET / FAST ETHERNET NOTIFICATIONS (if any) WARNING: 38157997 symbol errors found. Symbol error frames are the errors that occur due to misalignment of encoding at layer 1. These errors indicate packets coming into the interface with incorrect encoding, also that cable is not present or GBIC is not present or there is a bad cable or noise on the cable. TRY THIS: For possible causes, start checking the cable, for GBIC's. Ensure that the cable length is as per the recommended values. Also check the media converter.


What may be the issue?

------------------ show version ------------------

Cisco Internetwork Operating System Software
IOS (tm) C3750 Software (C3750-I9-M), Version 12.1(19)EA1d, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Mon 05-Apr-04 22:40 by antonino
Image text-base: 0x00003000, data-base: 0x007CBC3C

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.1(19r)EA1b, RELEASE SOFTWARE (fc2)

KCHJCS01 uptime is 1 year, 12 weeks, 5 days, 5 minutes
System returned to ROM by power-on
System image file is "flash:c3750-i9-mz.121-19.EA1d/c3750-i9-mz.121-19.EA1d.bin"

cisco WS-C3750G-12S (PowerPC405) processor (revision H0) with 118776K/12288K bytes of memory.
Processor board ID CAT0836Z1S4
Last reset from power-on
6 Virtual Ethernet/IEEE 802.3  interface(s)
24 Gigabit Ethernet/IEEE 802.3 interface(s)
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 00:12:01:4B:22:00
Motherboard assembly number     : 73-8307-08
Power supply part number        : 341-0048-01
Motherboard serial number       : CAT08360L74
Power supply serial number      : LIT083103SU
Model revision number           : H0
Motherboard revision number     : A0
Model number                    : WS-C3750G-12S-S
System serial number            : CAT0836Z1S4
Top Assembly Part Number        : 800-21966-01
Top Assembly Revision Number    : K0
Version ID                      : N/A
Hardware Board Revision Number  : 0x07

Switch   Ports  Model              SW Version              SW Image           
------   -----  -----              ----------              ----------         
*    1   12     WS-C3750G-12S      12.1(19)EA1d            C3750-I9-M         
     2   12     WS-C3750G-12S      12.1(19)EA1d            C3750-I9-M       

Switch 02
Switch Uptime                   : 1 year, 5 weeks, 6 days, 5 hours, 55 minutes
Base ethernet MAC Address       : 00:14:A8:2A:1A:00
Motherboard assembly number     : 73-9678-04
Power supply part number        : 341-0048-03
Motherboard serial number       : CAT09241QN0
Power supply serial number      : LIT092000RU
Model revision number           : M0
Motherboard revision number     : A0
Model number                    : WS-C3750G-12S-S
System serial number            : CAT0925Z1CT
Top assembly part number        : 800-25856-02
Top assembly revision number    : A0
Version ID                      : V04

Configuration register is 0xF




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francisco_1 Wed, 03/17/2010 - 06:28
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I have come across a caveat for the symptom you describe above that could be related.

Infact the IOS version you have has been deffered. I suggest you plan for upgrade as it could be a bug..


The interface LED blinks green instead of amber when it receives valid 802.1Q packets that are 64 to 67 bytes long including the 802.1Q tag

amardram123 Wed, 03/17/2010 - 09:42
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Hi francisco,

the bug CSCec53648 is fixed in 12.1(19)EA1d..... I am already running 12.1(19)EA1d... So there is no chance of this bug affecting the issue which i described...

Thanks & Regards


francisco_1 Wed, 03/17/2010 - 09:54
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It could be a bug or not but again as i mentioned you are on a deffered code. Even if you open a TAC case with cisco sometime in the future they will mention the same thing to you.

Safer to be running a code supported.


Reza Sharifi Wed, 03/17/2010 - 06:37
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Hi Amar,

Francisco is right.  The version you are using is deferred.  Time to upgrade.


jfraasch Wed, 03/17/2010 - 09:46
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Did you replace the GBICs on both sides as well?  If not a bug then the error even says it is layer 1.  Cables or GBICs.  You replaced the cables, now try to replace the GBICs.  Do one at a  time to try to isolate the problem GBIC.

I wasn't clear if this was multiple ports on the switch or not.  Also, is it only the master switch that has the errors?

Still, I agree with other two posters about IOS upgrade.  Not a bad idea.

Best of luck!


amardram123 Wed, 03/17/2010 - 10:33
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Thanks Guys...

I will try to have final webex session on our cust switch by tommorow to collect more info.. and if i dont find anything specific to the problem then i will recommend to upgrade IOS.. i will update here if the issue is fixed by upgrading the IOS...



Leo Laohoo Wed, 03/17/2010 - 15:40
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1.  That code is ancient!
2.  Can you post the output for the command "sh controller ethernet "?


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