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Cisco Bug: CSCvi09354 - EOR: Standby SUP/Older BIOS unable to Sync up with Active SUP/newer BIOS, goes in boot loop

Last Modified

Aug 13, 2019

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I4(6.19)

Description (partial)

Symptom:
On a Nexus 9500 Switch, whenever Standby SUP with older nx-os image 6.x is inserted in chassis containing Active Supervisor running NX-OS image 7.0(3)I4(1) and later, the Standby Supervisor can get stuck in boot loop and might not be able to recover. This happens because of the difference in the BIOS versions between the 6.x and the newer 7.x images post 7.0(3)I4(1)

Conditions:
This can happen when a new RMA Supervisor is inserted into the chassis.
The new RMA Supervisor is running an older 6.x code and thereby running an older BIOS
The current Active Supervisor is running newer 7.0(3)I4(1) and later release.
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Bug Details Include

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