Nagios Support Forum

Posted: **Sun Sep 17, 2017 11:16 pm**

Hi all, I am trying to use nagios check_snmp plugin to monitor the port status of my cisco 6504E switch.
I successfully use the check_snmp to get the port status but nagios didn't change the status to critical even snmp return the status is down.
It still show "SNMP OK". I already updated check_snmp version to 2.2 but is still abnormal function. It seem the -r 1 is not working.

Below is the command i using:

[root@monitor monitoring-plugins-2.2]# /usr/local/nagios/libexec/check_snmp -H XX.XX.XX.XX -C ABC -o IF-MIB::ifName.1 -o ifOperStatus.1 -r 0
SNMP CRITICAL - *Gi1/2/1* down(2) |
[root@monitor monitoring-plugins-2.2]# /usr/local/nagios/libexec/check_snmp -H XX.XX.XX.XX -C ABC -o IF-MIB::ifName.1 -o ifOperStatus.1 -r 1
SNMP OK - Gi1/2/1 down(2) |
[root@monitor monitoring-plugins-2.2]# /usr/local/nagios/libexec/check_snmp -H XX.XX.XX.XX -C ABC -o IF-MIB::ifName.1 -o ifOperStatus.1 -r 2
SNMP OK - Gi1/2/1 down(2) |

My Nagios version is 4.1.1. Is there any way to make "-r 1" function normally? Thank you.

Posted: **Mon Sep 18, 2017 10:22 am**

I use the check below and it warns me whenever the port is down:

Code: Select all

define service{
	use			                generic-service
	host_name		        SW01
	service_description	        PORT 47 UPLINK 
	check_command		check_snmp! -C community -o ifOperStatus.47 -m IF-MIB -l OperStatus -s 'up(1)'
	}

The -s 'up(1)' is the expected string. Anything different from this and Nagios will understand that this is not OK.

Posted: **Mon Sep 18, 2017 1:24 pm**

Thanks @DiegoAnjos,

Here's something I found on another forum post that may be related?
https://support.nagios.com/forum/viewto ... =7&t=39059

Code: Select all

./check_snmp -H 10.xxx.xx.xx 1 -o xx -C public -r 1 -l "FW-01-eth1 interface status"

Tell the check what you expect for an output

Code: Select all

-r, --ereg=
      REGEX Return OK state (for that OID) if extended regular expression REGEX matches

so the -r 1 is for status 1 (up) if the status returns something else then 1 it fails

Let us know if DiegoAnjo's post or mine help

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