net-snmp isn't running pass_persist script? how do i know?

I setup a script for reading QoS/traffic shaping information from the
output of the tc command. The idea being that when I run the script as
a pass_persist extension for snmpd I can read the information remotely
from my network monitoring machine so I can see the traffic on the
different queues in all the router/firewalls on the network.

I add a line to snmpd.conf like this....
Code:

pass_persist .1.3.6.1.4.1.2021.255 /usr/bin/snmp_persist.pl


But when I try to browse it remotely I get this....

Code:

# snmpwalk -c yeahyeah -v 2c 10.0.0.1 .1.3.6.1.4.1.2021.255
UCD-SNMP-MIB::ucdavis.255 = No Such Instance currently exists at this OID


Any ideas why it might not be working or another step I have to
perform? I am pretty sure the script itself (snmp_perist.pl) works but
as far as I can see the script is not even being run by snmpd.

Is there any way I can switch on debugging inside snmpd to let me see
what is happening? All the options I have tried so far don't tell me
anything.

Regards,

Abdul-Wahid

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