Router/L3 Switch SNMP OIDs to monitor CPU Utilization & Mem

[Satyam]

Hi,

I am trying to use check_snmp plugin to monitor Cisco routers and Cisco L3
switches. I want to monitor CPU Utilization percentage & Memory Used/Free
(in MB/KB) for Router and switches. Can someone help me in finding the
exact OID to monitor these KPIs. I am using Net-SNMP package as base. I am
doing snmpget cli to first check the values for the OIDs. Is there anyways we can monitor these KPIs.

Thanks,
Manish Kumar,
IMS, Mahindra Satyam

[lmiltchev]

Manish,

I am not sure if this will help, but check this link out:

http://www.oidview.com/mibs/9/md-9-1.html

[Satyam]

I am still not very clear about this problem and how to go ahead. Actually I have checked on the exchange there are noreadily available plugins to monitor memory used and percent of cpu utilization on cisco router/switches. I thought i could write a wrapper around Net-SNMP utilities but i am not able to understand the details of OIDs and what it means and the units of it.


When I am doing snmpwalk on one of the cisco router for the memory pool


[root@mmkndnagdb libexec]# snmpwalk -v2c -c ********* 10.6.54.33 1.3.6.1.4.1.9.9.48.1.1.1
SNMPv2-SMI::enterprises.9.9.48.1.1.1.2.1 = STRING: "Processor"
SNMPv2-SMI::enterprises.9.9.48.1.1.1.2.2 = STRING: "I/O"
SNMPv2-SMI::enterprises.9.9.48.1.1.1.3.1 = INTEGER: 0
SNMPv2-SMI::enterprises.9.9.48.1.1.1.3.2 = INTEGER: 0
SNMPv2-SMI::enterprises.9.9.48.1.1.1.4.1 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.48.1.1.1.4.2 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.48.1.1.1.5.1 = Gauge32: 26538720
SNMPv2-SMI::enterprises.9.9.48.1.1.1.5.2 = Gauge32: 15792784
SNMPv2-SMI::enterprises.9.9.48.1.1.1.6.1 = Gauge32: 91092448
SNMPv2-SMI::enterprises.9.9.48.1.1.1.6.2 = Gauge32: 21955952
SNMPv2-SMI::enterprises.9.9.48.1.1.1.7.1 = Gauge32: 88922728
SNMPv2-SMI::enterprises.9.9.48.1.1.1.7.2 = Gauge32: 21934332
[root@mmkndnagdb libexec]#

Which of the above OIDs gives the values of memory used and or memory free and or total memory etc and is the values are in bytes. So i can do the calculations in my wrapper script.

Thanks,
Manish Kumar
Open Source Tools Team,
IMS, Mahindra Satyam, Bangalore, India

[scottwilkerson]

It is going to be somewhat device specific.

I would run your snmpwalk from 1.3.6.1.4.1.9.9.48

And then using the details here, compare the numbers to what you would expect to see
http://www.oidview.com/mibs/9/CISCO-MEM ... L-MIB.html

[Satyam]

Thanks for the reply , But i just wanted to confirm these:

1.3.6.1.4.1.9.2.1.58.0 -> CPU Utilization in percentage (Have i understood correctly, also on most of the routers its showing 0 always, this is why i am confused how it can be 0 % most of the time)

1.3.6.1.4.1.9.2.1.8.0 (or 1.3.6.1.4.1.9.9.48.1.1.1.6.1) -> Free Memory in Bytes (Have i understood correctly)


If i understood correctly, can i go ahead and configure(using check_snmp) in my production NagiosXI these KPIs for monitoring network devices.

[scottwilkerson]

To be honest, the best place to find out conclusively would be the device manufacturer, in this case Cisco.