Guest

Cisco 12000 Series Routers

Field Notice: Cache Parity Error on GSR 1GE Card


Updated August 22, 2002

June 14, 2002



Products Affected

Product

GE-GBIC-SC-B

GE-SX/LH-SC

8FE-FX-SC

8FE-FX-SC-B

8FE-TX-RJ45

8FE-TX-RJ45-B

OC12/SRP-IR-SC-B

OC12/SRP-LR-SC-B

OC12/SRP-MM-SC-B

OC12/SRP-XR-SC

Problem Description

Cisco 12000 series Engine1 one port Gigabit Ethernet (GE) line cards may exhibit intermittent Cache Parity Exceptions.

Background

It has been determined that some cards are susceptable to internal cache corruption issues when operating at very specific voltage and temperature conditions.

Cache Error Recovery Feature (CERF) is a software feature in Engine1 line cards that detects and corrects cache parity errors by flushing errors from the external CPU cache, and refreshing the cache line from DRAM. This feature provides intelligence in the CPU cache management algorithm that enables the CPU to recover from a cache memory parity error, preventing a line card crash without incurring a performance hit.

CERF is available in 12.0S software beginning in Cisco IOS® Software Release 12.0(21)S3.

Problem Symptoms

Symptoms for this issue are intermittent multiple crashes due to "Cache Parity Exceptions" (Sig=20)

CRASH INFO: Slot 2, Index 1, Crash at ............. 
...... 
Card Type: 1 Port Gigabit Ethernet, S/N xxxxxxxxxxx 
System exception: sig=20, code=0xE430725B, context=0x40703FA4 
System restarted by a Cache Parity Exception 
...... 
...... 

Workaround/Solution

The workaround to this issue is to upgrade the Cisco IOS software to a release which has the CERF. This feature was first available in 12.0(21)S3.

Note:?CERF is on by default. ? The activity of this software Error Correction Code (ECC) can be monitored by the command show controller cerf. To turn off the feature use the global configuration command no service cerf.

DDTS

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

DDTS

Description

CSCdv85839 (registered customers only)

GSR E1: High frequency of Cache Parity Exceptions (sig=20)

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: