CPU Utilization is not displaying correctly (Ciso ISR4451)

Hi,

I'm hoping somebody can help me with this, I've been wondering why my Cisco ISR4451 (Cisco IOS Software, ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.5(3)S2, RELEASE SOFTWARE (fc2)) is not showing the correct CPU utilization in NPM. Yesterday, there was an instance wherein the CPU reached 100% but in Orion, it shows only 8-9% peak contrary to what the actual router is saying, for some reason the NHRP process on this router burst maxing the CPU so I needed to reset the process, but I never got an alert in Orion and when I checked in NPM the utilization did not peak to 100% that's why it did not alert. I'm already using the custom device poller on this post: Cisco ASR Showing 95% 98% Memory Used.

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jlim13

Anybody who would like to take stab on this? Appreciate any assistance, suggestion or recommendation the community can share.

Regards!

amarnath_r

We have this issue in 11.5 and after upgrading to 12 it seems to be fine now.

cgregors

This is a common problem but if you dissect it a little it will make sense

The Cisco graph which is derived from on-board CPU load history shows the spike
The Orion graph which is derived from SNMP gathered history shows a data gap.
When the Cisco device goes to 100% CPU, it's too busy to respond to SNMP queries from Orion and thus there is no data point to graph
When the CPU comes out of 100% utilization, SNMP can reply to Orion and you get data points again

Observation: The rising and falling edges of the Orion graph should line up with the device going into and coming out of 100% CPU utilization.

Observation: This is not Orion or Cisco version dependent.

Solution 1: Increase the SNMP timeout for polling this device (All devices would be a bad idea). This MAY give SNMP time to reply to Orion.

Solution 2: Write an alert that triggers when a device returning valid data points. This is the UNKNOWN state.

Chris