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Cisco Memory Sensors

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On many of the newer Cisco switches, there is a concept of platform memory. This is memory on the device similar to RAM on a PC and not the memory that is contained within the processor. You can get the memory levels from the following command: show memory plaform. Cisco switches 3650, 3850, 9300, 9400, 9500, etc. utilize this memory. It's very important to monitor this memory as Cisco has a number of memory leak bugs that will cause all kinds of terrible network issues and/or a crash of the switch. We have monitored this memory prior using SolarWinds. Do you have a sensor already built for this or is this a custom build? On SolarWinds, I use the following OIDs in a calculations to determine percent memory.

Memory Used: 1.3.6.1.4.1.9.9.109.1.1.1.1.12 Memory Free: 1.3.6.1.4.1.9.9.109.1.1.1.13

Thank you.

3650 3850 9300 9400 9500 cisco memory platform snmp

Created on May 8, 2020 4:39:01 PM



3 Replies

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Hi there,

You can use for this our Cisco System Health Sensor. Depending on what your device can deliver via SNMP, the sensor can show, for example, the following system health components:

  • CPU load in percent
  • Available memory in absolute and percentage values
  • Values of the current
  • Status of power supplies
  • Voltage values
  • Fan states
  • Current temperature and temperature status
  • Other information, for example, transmit and receive power

    PRTG creates one sensor per component

Kind regards

Felix Wiesneth - Team tech Support

Created on May 8, 2020 7:33:49 PM by Felix Wiesneth [Paessler Support]



Votes:

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Felix,

Thanks for your response. However, the default memory sensor pulls data for the memory associated with the CPU. While this is important, it is not the only memory that we need to monitor on the Cisco switch. If your engineering has not done so, they should be looking into this as it should be added as a default sensor for these newer Cisco switches. The older switches did not have this type and usage of memory. The newer switches do. Can you provide me with documentation to create a custom sensor that would display this data?

Thanks,

aours

Created on May 12, 2020 1:11:01 PM



Votes:

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Hi aorus,

The used MIB file for Cisco devices is "CISCO-ENVMON-MIB" and for Cisco UCS devices "CISCO-UNIFIED-COMPUTING-TC_MIB". Please note that we can't provide you with the detailed Sensor info, since this is internal knowledge.

For your custom sensor I would recommend to use a SNMP Custom Advanced sensor.

Felix Wiesneth - Team Tech Support

Created on May 13, 2020 9:04:59 AM by Felix Wiesneth [Paessler Support]




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