Catalyst 9500 Reload issue

[Heiko Kelling]

Hello,

we have some Cisco 9500 switches. I wanted to restart one via CLI with the normal reload command and then the following error message came up:

***ERR - AdelphiI2cWriteACT(247): I2C access failed
I2C controller is in error state, reg value: 0x00000051

Only a hard restart was possible with pulling the plug. After the reboot the reload command was working again. 

Does anyone have any idea what that might be?

[Leo Laohoo]

What firmware is the switch running on?

[balaji.bandi]

***ERR - AdelphiI2cWriteACT(247): I2C access failed

Looks for me bug,  before you hard boot , did you collected any show loggs ?

can you post show version output.

[marce1000]

 - Looks like a spiked or short-lived hardware issue, configure syslog to an external syslog server , and keep watching logs

 M.

[Heiko Kelling]

Thanks to all. Version is IOSXE: 16.12.3s

[Leo Laohoo]

Smells like CSCvp12275.

[balaji.bandi]

May be bug as @Leo Laohoo  mentioned, check the boot variable as work around.

[kishkp]

Hard reboot didn't help 

***ERR - AdelphiI2cWriteACT(247): I2C access failed I2C controller is in error state, reg value: 0x00000051

[kishkp]

***ERR - AdelphiI2cWriteACT(247): I2C access failed I2C controller is in error state, reg value: 0x00000051

[balaji.bandi]

May be raise raise TAC case for assistance.

[Leo Laohoo]

---

@kishkp wrote:
I2C access failed I2C controller is in error state

---

I2C is the chip that verifies if the platform is "authentic" or not.  

It is known to have a hardware bug where it routinely fails.  Happens to APs (starting from 2800/3800/4800/1560 and newer),  switches (2960X/XR, 6840, 3650/3850 and newer). 

There is nothing that can be done except to RMA the switch.