Sup 720 NVRAM lithium battery voltage display command?

[ronwagner]

Cisco appears to use a lithium battery for holding NVRAM (as opposed to some type of EEPROM or flash technology which they used in generations past).  My observations are that the battery can go bad and cause undesirable things like booting into ROMMON after a power cycle and/or fully corrupted NVRAM. 

Although I have only observed this on cat 6500, I anticipate that the cat 4500, and Nexus series can encounter similar problems.  Not sure about smaller switches, haven't taken a hammer and screwdriver to them yet.

Is there a way to display the voltage of the lithium battery on supervisor engines? Oh and if so how 

[InayathUlla Sharieff]

Sir,

Sorry to say that I dont find any command to check what you are requesting for.

The closet present match :

https://supportforums.cisco.com/thread/2062336

HTH

Regards

Inayath

[Ivan Shirshin]

Hi Ron,

Whenever voltage goes below threshold, an interrupt is raised and a console message is printed that there is low voltage. You need to monitor logs for this.

As of now, there is no CLI to check the voltage manually, as Inayath advised.

Kind Regards,
Ivan Shirshin

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[ronwagner]

Thank you both for the information.  

Ivan, do you know if the message is the same message as mentioned in Inayath comment.........-LOW_BATT: Low Voltage detected for NVRAM Battery ?

I presume this will be in syslogs, providing the switches' configuration is setup appropriately.

Do you know what log level the message would be? 

Thanks,

Ron

[Ivan Shirshin · Accepted solution]

welcome, Ron.

The message will be one of the following:

%C7600_PLATFORM-SP-3-LOW_BATT: Low Voltage detected for NVRAM Battery
%C7600_PLATFORM-SP-STDBY-3-LOW_BATT: Low Voltage detected for NVRAM Battery

It is logged at "log error" level .

Kind Regards,
Ivan Shirshin

**Please grade this post if you find it useful.

[Ivan Shirshin]

and yes, it will be in syslogs with correct logging config.