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Cisco ONS 15300 Series

Field Notice: *Expired* FN - 24314 - Premature XTC Card Removal on ONS15327 May Cause Potential Flash Corruption


Revised June 2, 2008
April 11, 2003



NOTICE:

THIS FIELD NOTICE HAS BEEN EXPIRED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.

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

Products Affected

  • 15327-XTC-28-3-T

  • 15327-XTC-28-3

  • 15327-XTC-14-T

  • 15327-XTC-14

Problem Description

Removing an XTC while the flashing Fail and Act/Stby LEDs are blinking may cause a potential flash corruption to the code partition ("/flash0" or "/flash1") and/or database partition ("/DBA" or "/DBB?), resulting in the card failing to properly boot.

Therefore, do not remove the XTC while the LEDs are blinking.

Code partition flash corruption occurs when the XTC is pulled out of the chassis while it is copying software from its peer XTC. Database partition flash corruption occurs if the XTC is pulled out of the chassis while it is accessing its provisioning database. Flash corruption involves both software downloads and transfers. A minor non-service affecting alarm (SFTWDOWN) is generated when the XTC is downloading or transferring software. Please refer to the Cisco ONS 15327 R3.3 User Documentation for more associated details.

In addition, Cisco is now only shipping XTCs with the proper warning label implemented on the board to further alert users about the potential corruption. The label reads:

Attention: Removing card or power during software copy (indicated by alternately flashing Fail and Act/Stby LEDs) will render the XTC inoperable.

A "software copy" is the process of transferring application code or provisioning database from one XTC to another XTC. XTC flash memory can be corrupted anytime a write access to flash memory is disrupted. Flash writes are indicated by the flashing Fail and Act/Stby LEDs.

Background

Code partition of the flash ("/flash0" or "/flash1") corruption can occur when the XTC is pulled out of the chassis while it is copying software from its peer XTC. This occurs in two possible situations:

  1. User-initiated software download: A download alarm is visible to the user.

  2. Automatic software download: Occurs when an XTC with software not similar to its peer is inserted into a chassis. For example, the active XTC in a chassis with version 1.0.1 and an XTC loaded with version 1.0.0. is inserted. The active XTC will then proceed to copy its software version unto the newly inserted standby. This operation may take as long as 45 minutes. There is no download alarm raised, but the fail and active/standby LEDs will blink in succession during the entire duration of the copy operation.

Database partition of the flash ("/DBA" or "/DBB?) corruption can occur if the XTC is pulled out of the chassis while it is accessing its provisioning database.

Problem Symptoms

The ONS 15327 XTC card fails to boot or load and the Fail and Act/Stby LEDs will be flashing.

Workaround/Solution

Do not remove the XTC while the LEDs are blinking.

Cisco has implemented a warning label on the XTC board to further alert users about the potential corruption. The label reads:

Attention: Removing card or power during software copy (indicated by alternately flashing Fail and Act/Stby LEDs) will render the XTC inoperable.

References

Please refer to the Alarm Troubleshooting section of the Cisco ONS15327 User Documentation for more details on the associated warning relating to flash corruptions.

Please note the warning label applied to the XTC card shown below.

XTClabel.gif

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: