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Manual power cycle required while upgrading NXOS N9K-C9500 switch with SUP A+/B+ HW rev 1.0
After an NXOS electronic programmable logic device (EPLD) upgrade, Cisco Nexus 9500 Series Switch supervisor SUP A+ or SUP B+ V02 may not be able to boot until a manual power cycle is performed.
A small batch of N9K-SUP-A+ and N9K-SUP-B+ supervisors have a voltage regulator module (VRM) that has a firmware defect. The VRM is responsible for powering the supervisor. Due to this firmware defect, the supervisor will hang after an EPLD upgrade of the supervisor or system controller. The upgrade requires a power cycle of the chassis.
This issue will not be seen with a software reload, an upgrade or downgrade of Cisco NXOS Software (not EPLD), or a manual power cycle of the chassis.
After the upgrade of an EPLD of the supervisor or system controller of a Cisco Nexus 9500 Series Switch, the N9K-SUP-A+ or N9K-SUP-B+ supervisor will be in stuck condition. There will be no response from or output on the console.
In a chassis with dual supervisors, the active supervisor will be stuck in powered-up state. The chassis may be able to boot using the standby supervisor in active state.
In a chassis with a single supervisor, the active supervisor will be stuck with no output on the console.
A manual power cycle of the chassis or an online insertion and removal (OIR) of the stuck supervisor is required to recover from the stuck state.
There are two options to mitigate this issue.
Option 1: Upgrade to a fixed Cisco NXOS Software release.
The new firmware with the fix for this issue will be included in the following Cisco NXOS Software releases:
Note: For a chassis with single supervisor, the above command will only give output for one slot.
Serial Number Validation
Cisco provides the Serial Number Validation Tool to verify whether a device is impacted by this issue. To check the device, enter the serial number in the Serial Number Validation Tool.
Important: For security reasons, you must click the Serial Number Validation Tool link that is provided in this section. Do not copy and paste the link into a browser. Use of the Serial Number Validation Tool URL external to this field notice will fail.
Updated to hardware vs software FN, no changes to any content.
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