snmp result not valid (-U) when fetching integer value

[henrik]

Hello,

I have a hopefully easy question. I am trying to graph cpu workload with current cacti version and ucd-snmp.

Whenever I try to fetch an INTEGER snmp value I get the error message:

Result from SNMP not valid. Partial Result:
02/27/2005 02:05:02 PM - CMDPHP: Poller[0] Host[1] SNMP: v1: 127.0.0.1, dsname: cpuidle, oid: .1.3.6.1.4.1.2021.11.11, out
put: U

If I do an snmpwalk I can fetch the corresponding value:

snmpwalk -v 1 -c public 127.0.0.1 .1.3.6.1.4.1.2021.11.11
UCD-SNMP-MIB::ssCpuIdle.0 = INTEGER: 97

What I recognized is that the problem always occured when I tried to fetch an INTEGER snmp value. For all others (e.g. STRING, GAUGE) it works fine.

What am I doing wrong ? I´m using the default GET SNMP template to fetch the data. Is it not possible to fetch INTEGER values ?

Any hint would be highly appreciated

Thanks !!

[TheWitness]

Please provide you versions, Cacti, net/ucd-snmp, MySQL, Cactid, etc. Also, please provide the Graph Template you are using to graph.

Thanks,

TheWitness

[henrik]

Hello,

I´m using Cacti cacti-0.8.6c-1 together with net-snmp-5.0.6-17 (rh 9) and mysql mysql-3.23.54a-11. Attached you will find the graph and one example data template.
I don´t use cactid. I´m gathering the data direct from the oid.

Thank you very much !!

Henrik

[henrik]

I just tried the same configuration under fedora core 3 - exactly the same problem. So I don´t think it´s a problem with the versions (cacti 0.8.6c, mysql 3.23.58-14, php 4.3.10-3.2, net-snmp 5.1.2-11)
It seems to be a basic problem with my template design.

Henrik

[henrik]

Ok, I solved it by myself. Very simple
.....
A common mistake when using the snmpget command is to leave off the index into the data you're looking for. In the above commands, the variable requested by the OID is a scalar and the index to scalars is always a simple '0' (zero), hence the trailing '.0' in all the oids above. If you had left it off, you would have gotten an error. Note that the errrors differ slightly between SNMPv1 and SNMPv2c:

snmpget -v 2c -c public 127.0.0.1 UCD-SNMP-MIB::ssCpuIdle
Error in packet Reason: (noSuchName) There is no such variable name in this MIB.
This name doesn't exist: system.sysUpTime

Or, depends on the snmp version: No Such Instance currently exists
....

So just put the .0 behind the OID and everthing works fine:
snmpget -v 2c -c public 127.0.0.1 UCD-SNMP-MIB::ssCpuIdle.0

Hope that helps others !

Henrik