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Cisco redundant power supply sensor ?

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Hello, how can I tell when my Cisco switch/router fails over to redundant power supply using a PRTG sensor ? Thank you kindly.

cisco prtg sensor

Created on Nov 7, 2016 10:35:29 PM by  fran1942 (0) 1



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Hello there,
thank you for your KB-Post.

The standard Cisco System Health sensor is able to monitor the status of all connected power supplies, when reported by the monitored device. Please note that the sensor requires SNMP to work.

Please also review the sensor's remarks:


Best Regards,
Luciano Lingnau [Paessler Support]

Created on Nov 8, 2016 10:27:57 AM by  Luciano Lingnau [Paessler Support]



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Hello, thank you for that. However, I am still unsure as to whether there is a method to tell if a Cisco power supply cuts over to redundant power supply or not ? i.e. rather than simply stating the condition of the power supply ? Thank you for any comments.

Created on Nov 8, 2016 9:54:50 PM by  fran1942 (0) 1



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Hello Fran,
thank you for your reply.

As far as we're aware, a device doesn't report a Power Supply as being the "redundant" one or not. They're simply considered "Power Supplies". Please refer to this data reported by an actual stack:

Power Supplies Name's/Description

ciscoEnvMonSupplyStatusDescr.1009"Switch 1 - Power Supply A, Normal"
ciscoEnvMonSupplyStatusDescr.1010"Switch 1 - Power Supply B, Normal"
ciscoEnvMonSupplyState.1009"1"(normal)
ciscoEnvMonSupplyState.1010"1"(normal)
ciscoEnvMonSupplySource.1009"2"(ac)
ciscoEnvMonSupplySource.1010"2"(ac)

You can further review the CISCO-ENVMON-MIB MIB in this 3rd partywebsite:

While the standard sensor doesn't evaluate the ciscoEnvMonSupplySource, it appears to "always" be reported as "2"(AC) and never one of the other Statuses(Which includes "internalRedundant"):

unknown(1), ac(2), dc(3), externalPowerSupply(4), internalRedundant(5)

if it did, you could use an SNMP Custom Table sensor + Lookup to monitor your power supplies and have an additional channel telling you whenever the power supply "source" is: unknown(1), ac(2), dc(3), externalPowerSupply(4) or internalRedundant(5).


Conceptually, a "redundant" power supply isn't a specific Power Supply, only the concept of having more than a single unit performing the same task result in "redundancy". For the switch it doesn't matter which power supply is providing power as long as it is. And any failed power supply (being the "redundant" unit or not) is still an issue to worry about.

There are different SNMP implementation, for instance for physical disks on a RAID where a Disk's Status can be Hot Spare, since it's a "standby redundancy", which differs from being a RAID Member (but conceptually there's also not a "primary and redundant" disk in a RAID1 array).



Best Regards,
Luciano Lingnau [Paessler Support]

Created on Nov 9, 2016 10:25:25 AM by  Luciano Lingnau [Paessler Support]



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.