http://www.switch.ch/misc/leinen/snmp/perl/SNMP_util is a stand-alone perl module for basic snmp activities. It does not appear to be in CPAN (and don't confuse it with SNMP::Util, which
is in CPAN), you have to get it from it's home page.
And note that stored locally, it's called SNMP_session.tar.gz