Re: Net::SNMP usage

Hi John,

Wrong list, Net::SNMP is not associated with the Net-SNMP project,
though Net::SNMP works very well with the Net-SNMP agent.

See the perldoc for Net::SNMP, it explains clearly how to access
variables in the returned hash.

I use Net::SNMP extensively, if you have problems after reading the
perldoc for Net::SNMP and looking at the examples that come with the
module I would be glad to answer you off list.

- Max

On Tue, Jan 26, 2010 at 7:42 PM, John Fulton <[email protected]> wrote:
> I have several monitoring scripts that pull SNMP stats off of switches and routers that I have used for the past 10 years using perl by running snmpget and parsing the program output into variables:
>
> Ex:
> ===
> open(GETIN, "/usr/bin/snmpget -Oqf -v2c -c public 192.168.1.20 interfaces.ifTable.ifEntry.ifInOctets.1 |");
> (@temp) = split(/\s+/, <GETIN>);
> $inBytes = $temp[$#temp];
> ===
>
> Pretty rough, but it's worked for us for over 10 years.
>
> I have decided to torture myself by learning to use Net::SNMP instead of modifying our older scripts for pulling stats off of some of our newer equipment.
>
> The purpose is to create a comma delimited file of statistics from these devices (satellite modems). I have created the array of OID values to retrieve, and have pulling the info from the device, but have hit a bit of a roadblock in my understanding on parsing the output to get the returned values.
>
> Here is what I have sofar:
> -------------------------------------------------
> #!/usr/bin/perl
>
> use Net::SNMP;
>
> $SNMP_COMMUNITY = "public";
> $SNMP_VERSION = "2";
>
> $VSAT_ANCH_IP = "172.16.0.40";
>
> @VSAT_ANCH_OID = ('1.3.6.1.4.1.2591.26.1.8.1.1.8.1.1', #CA Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.3.1', #UN Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.3.2', #GA Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.3.4', #CB Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.3.5', #SG Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.4.1', #SP Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.4.2', #KC Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.4.3', #NO Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.4.4', #FY Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.4.5', #SA Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.4.6', #AN Rx
>                  '1.3.6.1.4.1.2591.26.1.8.1.1.8.4.7', #IL Rx
>                  '1.3.6.1.4.1.2591.26.1.1.3.0'); #Tx Power Level
>
> ($session, $error) = Net::SNMP->session(
>                                -hostname       => $VSAT_ANCH_IP,
>                                -version        => $SNMP_VERSION,
>                                -community      => $SNMP_COMMUNITY,
>                                );
>
>
> $VSAT_ANCH = $session->get_request(-varbindlist => \@VSAT_ANCH_OID,
>                                  );
>
> snmp_dispatcher();
>
> $session->close();
> -------------------------------------------------
> Each of those OID values should return an integer value from 10000 to -2500.
>
> I do not quite understand how to access the returned results in $VSAT_ANCH as what I see in the variable is "HASH(0x9c75270)" when referenced.
>
> Thanks for any help in pointing me in the right direction.
>
> -John Fulton
>
>
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