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Cisco Catalyst 4900 Series Switches

Field Notice: FN - 62488 - WS-C4948-10GE May Reset Due to Multibit ECC Error


Revised June 16, 2008
June 5, 2007


NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

 
Revision Date Comment
1.1 16-JUN-2008 Removed Upgrade form and references to the form, changed workaround to RMA and added serial numbers affected to the Workaround/Solution section.
1.0 05-JUN-2007 Initial Public Release

Products Affected

Products Affected
WS-C4948-10GE
WS-C4948-10GE-E
WS-C4948-10GE-S

Problem Description

The WS-C4948-10GE fixed configuration switch models may reset due to a multibit ECC error on the SDRAM memory.

Background

Cisco has found that the above fixed configuration models have a potential to experience SDRAM degradation. This could result in switch reloads. In advanced circumstances when SDRAM has degraded extensively, the switch could reload and hang on reboot. Factors which influence the extent of SDRAM degradation are the length of time the switch has been in operation along with network traffic patterns that affect SDRAM access. The extent of degradation is not easily quantifiable.

Problem Symptoms

The degradation of SDRAM is a slow process over an extended period of time. Marginal SDRAM degradation can be noted when a switch reloads unexpectedly and leaves behind a multibit-ecc error signature in the crashdump file. See CSCsf14520 for detailed information. Severe SDRAM degradation can be noted when the switch fails to boot and hangs in the process of loading IOS. In such scenarios, while connected to console, reset the unit and if the system hangs after several hash prompts "###########" the problem will be identified.

Workaround/Solution

Only WS-C4948-10GE fixed configuration switches with the Serial numbers below and Hardware Revision numbers are vulnerable. Please follow the following steps to identify if your switches are affected:

STEP 1) Check the WS-C4948-10GE Serial Number:
a) Lower than and equal to JAx1008xxxx
b) JAx1014xxxx to JAx1022xxxx
c) JAx1025xxxx
d) JAx1039xxxx

(where x at any location in the Serial Number can represent any letter or number)

STEP 2) If the Serial Number does not match the values above, then the WS-C4948-10GE is not affected. If the
Serial Number does match, please go to STEP 3.

STEP 3) Check the WS-C4948-10GE to see if it has a vulnerable Hardware Revision number:
a) 1.0, 1.1, 1.2
b) 2.0, 2.1, 2.2, 2.3
c) 3.0, 3.1, 3.2

STEP 4) If both the Serial Number and Hardware Revision number match the values above, please use the standard RMA process to order replacement parts. After receiving the replacement switch please return affected unit to Cisco.

Units that do not meet both the Serial number and Hardware Revision detailed above are not vulnerable.

Note: When replacing units which are affected by this field notice with upgrade units, please keep the original power-supplies, 10GE-X2 modules, and power cables so that they can be used in the upgrade units.

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered customer and you must be logged in.

     
DDTS Description
CSCsf14520 (registered users only) Multibit ECC errors on 4948-10GE (JAWS)

How To Identify Hardware Levels

To identify the Serial Number and Hardware Revision of the installed switches, use the show idprom supervisor command as shown in the example below. Please note that the Serial Number of interest will appear under the tag "SecSerialNum string":
Example: show idprom supervisor on WS-C4948-10GE
4948-10GE-switch#show idprom supervisor
Supervisor 1 Idprom :
Common Block Signature = 0xABAB
Common Block Version = 1
Common Block Length = 144
Common Block Checksum = 4426
Idprom Size = 256
Block Count = 4
FRU Major Type = 0x4101
FRU Minor Type = 358
OEM String = Cisco Systems, Inc.
Product Number = WS-C4948-10GE
Serial Number = FOX1104173F
Part Number = 73-9344-09
Part Revision = A0
Manufacturing Deviation String =
Hardware Revision = 3.2
-> Inside the affected H/W Revision range
Manufacturing Bits = 0x0000
Engineering Bits = 0x0000
Snmp OID = 0.0.0.0.0.0.0.0
Power Consumption = 0
RMA Failure Code = 0 0 0 0
Supervisor Block Signature = 0x4101
Supervisor Block Version = 1
Supervisor Block Length = 24
Supervisor Block Checksum = 674
Feature Bits = 0x0000000000000000
Card Feature Index = 120
MAC Base = 001b.0cdd.4b40
MAC Count = 64
Clei Block Signature = 0x4601
Clei Block Version = 1
Clei Block Length = 22
Clei Block Checksum = 967
Clei code string = IPMHE10FRA
Version ID string = V06
SecSerialNum Block Signature = 0x4602
SecSerialNum Block Version = 1
SecSerialNum Block Length = 26
SecSerialNum Block Checksum = 772
SecSerialNum string = JAE110765UH
-> Outside the affected S/N range

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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