You might do better looking at developing this as a "normal" MIB handler (i.e. written in C) - either compiled into the main agent, or as an AgentX subagent. That will receive all the relevant varbinds from a single request, and allow you to work with all three values at once.
Since he seems to be familiar with Perl, an embedded Perl MIB handler might be a good alternative -- provided the package has been configured with --enable-embedded-perl. There's an example here:
http://www.net-snmp.org/tutorial-5/toolkit/perl/perl_module.pl
+Thomas
-- Thomas Anders (thomas.anders at blue-cable.de)
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