Field Notice: FN - 70358 - NCS 2000 Single Shelf Controller-Replacement of Release 11 Controller With Pre-Release 11 Controller and Vice Versa Causes Traffic Loss - Workaround Provided

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	Publish Date	Comments
1.0	25-Feb-19	Initial Release

Products Affected

Affected Product ID	Comments
NCS2K-TNCS-K9
NCS2K-TNCS-K9=	Part Alternate
NCS2K-TNCS-O-K9=	Part Alternate
NCS2K-TNCS-O-K9
15454-M-TNC-K9
15454-M-TNC-K9=
15454-M-TSC-K9
15454-M-TSCE-K9=
15454-M-TNCE-K9=
15454-M-TSC-K9=	Part Alternate
15454-M-TSCE-K9
15454-M-TNCE-K9
NCS2K-TNCS-2-K9
NCS2K-TNCS-2-K9=	Part Alternate
NCS2K-TNCS-2O-K9
NCS2K-TNCS-2O-K9=	Part Alternate

Defect Information

Defect ID	Headline
CSCvn72421	Replacing the controller cards (11.0) with legacy shelf controllers (pre-11.0) causes traffic loss

Problem Description

A traffic hit could happen on units that operate in an NCS 2002 (ONS 15454 M2) chassis under these situations:

• Replacement of a controller line card that runs a software release earlier than Release 11 with a controller line card that has Release 11 or later preloaded on it.
• Replacement of a controller line card that runs software Release 11 or later with one that has an earlier version of software preloaded on it.

These situations could result in a similar traffic hit on units that operate in an NCS 2006 (ONS 15454 M6) or NCS 2015 chassis if they run with a single controller line card (which is not a Cisco recommended configuration).

Background

A new file system has been introduced with NCS 2000 Release 11. A mismatch between the file system of the USB flash drive (stored in the chassis) and of the controller line card leads the controller to operate as if the chassis would have to be provisioned for the first time.

Problem Symptom

An NCS 2002 (ONS 15454 M2) chassis will report factory default settings or an invalid configuration after replacement of the controller line card.

An NCS 2006 (ONS 15454 M6) or NCS 2015 chassis operated with a single controller will report factory default settings or an invalid configuration after replacement of the controller line card.

Workaround/Solution

In order to avoid the issues mentioned in this field notice, Cisco recommends that you take these actions before you replace the controller line card in single shelf mode:

• When you replace the controller line card of an NCS 2002 (ONS 15454 M2) chassis, ensure that the replacement controller is preloaded with the same software release that runs on the controller to be replaced.
• In a similar way, when you replace the controller of an NCS 2006 (ONS 15454 M6) or NCS 2015 chassis operated with a single controller line card, ensure that the replacement controller is preloaded with the same software release that runs on the controller to be replaced.

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:

• Open a service request on Cisco.com
• By email
• By telephone

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