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Cisco Bug: CSCua99658 - EPLD upgrade failure on Forwarding Engine due to Chain conn broken error

Last Modified

Feb 24, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases


Description (partial)

EPLD upgrade of M1 or M2 series linecard may fail with the following error:

        Status: EPLD Upgrade failed
        Reason: Chain connectivity is broken (Error Number : 36)

Only specific line cards shipped with a revised Forwarding Engine are 
impacted. See affected Version IDs Under Conditions below. 

If using parallel EPLD upgrade only affected line card versions will fail, 
other cards in the system will upgrade successfully. 

If using serial EPLD upgrade, epld updates will not be completed on any 
modules after an impacted card fails.

Affected list of VIDs are as below . A PID which is not in the list is not 

PID                          Affected VIDs
N7K-M108X2-12L      V06 and onwards
N7K-M132XP-12L      V04 and onwards
N7K-M148GS-11L      V05 and onwards
N7K-M148GT-11L      V04 and onwards
N7K-M202CF-22L      V03 and onwards
N7K-M206FQ-23L      V03 and onwards
N7K-M224XP-23L      V03 and onwards


The issue is resolved in NXOS versions 6.1(3) and onwards

Related Community Discussions

Nexus 7000: M1/M2 モジュールの EPLD のダウングレードに失敗する
Introduction M1/M2 モジュールの EPLD バージョンを 2.00x から 1.00x にダウングレードを試みた際、以下のエラーメッセージが出力されダウングレードが失敗する。 | EPLD upgrade failed. Exiting.. Failure reason: Chain connectivity is broken while upgrading the FPGA.   Core Issue | ハードウェアバージョンによって M1/M2 モジュールに使用されている Forwarding Engine の FPGA が異なります。1.00x に対応した旧 FPGA と 2.00x に対応した新 FPGA があり、変更の理由は FPGA の供給が要因で、FGPA 自身の機能や性能に差分はありません。それぞれのモジュールで 2.00x の EPLD に対応しているハードウェアバージョンは以下のとおりです。 PID Hardware Version N7K-M108X2-12L V06 N7K-M132XP-12L V04 N7K-M148GS-11L V05 ...
Latest activity: Mar 20, 2014
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