Nagios Support Forum

Posted: **Tue Jul 29, 2014 5:08 pm**

So like the title says, I'm trying to monitor switch port duplex mode. I figured this would be doable using SNMP, however, what I didn't take into account were the older switches we need to monitor duplex on. Currently we're trying to monitor 3COM 4200G 48-port switches. The do appear to support SNMP, but whenever I reference most OIDs, I get errors. We'll take the default port monitoring command/service that comes with Nagios 4.0.7. Right now, I have configured:

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define command{
     command_name   check_snmp
     command_line   $USER1$/check_snmp -H $HOSTADDRESS$ $ARG1$ $ARG2$ $ARG3$ $ARG4$
     }

and

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define service{
     use                   generic-service
     host_name             NAME OF SWITCH
     service_description   Port 1 Link Status
     check_command         check_snmp!-C public -o ifOperStatus.1 -r 1 -m RFC1213-MIB
     }

What this returns in Nagios is really confusing:

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External command error: MIB search path: $HOME/.snmp/mibs:/usr/share/mibs/site:/usr/share/snmp/mibs:/usr/share/mibs/iana:/usr/share/mibs/ietf:/usr/share/mibs/netsnmp
Cannot find module (SNMPv2-SMI): At line 0 in (none)
ifOperStatus.1: Unknown Object Identifier (Sub-id not found: (top) -> ifOperStatus)

Has anyone seen this before?

Also, if someone knows of a better way to monitor port duplex, I'm all ears. I was hoping 3COM copied Cisco (Cisco has a portDuplex OID), but, alas, they did not.

Thank you!

Posted: **Wed Jul 30, 2014 2:17 pm**

It looks like your SNMPv2-SMI MIB is missing. Please run the following command and post the output:

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find / -name SNMPv2-SMI.txt

Posted: **Wed Jul 30, 2014 5:57 pm**

Alright, when I run

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find / -name SNMPv2-SMI.txt

my terminal lags for a second like it's thinking and then returns nothing and gives me the root::/# cursor.

Posted: **Thu Jul 31, 2014 10:21 am**

Yea, looks like you probably have no MIBs at all. Try running the following:

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yum install -y net-snmp-utils

I believe this should give you the standard MIBs, located by default in /usr/share/snmp/mibs/.

Posted: **Fri Aug 01, 2014 2:49 pm**

So neither the yum or apt-get commands found anything for net-snmp-utils, however I did manage to find http://www.net-snmp.org/, and I downloaded and installed the latest LTS version. Now the find command returns /net-snmp-5.7.2.1/mibs/SNMPv2-SMI.txt.

Posted: **Fri Aug 01, 2014 2:57 pm**

Try placing /net-snmp-5.7.2.1/mibs/SNMPv2-SMI.txt into /usr/share/snmp/mibs/ so it's in the default path the system will look for MIBs.

Posted: **Fri Aug 01, 2014 4:51 pm**

Okay, after moving my SNMPv2 text file to the directory you specified, Nagios is now returning the unknown status error:

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External command error: ifOperStatus.1: Unknown Object Identifier (Sub-id not found: (top) -> ifOperStatus)

Posted: **Mon Aug 04, 2014 4:53 pm**

Go ahead and copy over all of the MIBs from /net-snmp-5.7.2.1/mibs/ to /usr/share/snmp/mibs/ since it seems the one I had you move originally relies on some others.

Nagios Support Forum

Would love some ideas on how to monitor switch port duplex

Would love some ideas on how to monitor switch port duplex

Re: Would love some ideas on how to monitor switch port dupl

Re: Would love some ideas on how to monitor switch port dupl

Re: Would love some ideas on how to monitor switch port dupl

Re: Would love some ideas on how to monitor switch port dupl

Re: Would love some ideas on how to monitor switch port dupl

Re: Would love some ideas on how to monitor switch port dupl

Re: Would love some ideas on how to monitor switch port dupl