Hi Joe,
Thanks for replying, but your answer is not completely correct. The gateway application might not be supporting snmpv3, but the underlying Red Hat OS does .
I was able to create a snmp v3 user using the script /usr/bin/net-snmp-create-v3-user and was able to send messages to trap2sink configured in /etc/snmp/snmpd.conf file.
This was on
Gateway Appliance v8.1
Linux: 2.6.32-504.3.3.el6.x86_64
rpm packages, these upgraded with Layer7_PlatformUpdate_64bit_v8.1-01-28-2015.L7P patch.
net-snmp-libs-5.5-50.el6_6.1.x86_64
net-snmp-5.5-50.el6_6.1.x86_64
net-snmp-utils-5.5-50.el6_6.1.x86_64
Regards,
Anand