If you have one server that can query the switch, I think using the same settings on another server should work. But I have to admit, I haven't used SNMPv3 yet at all - most of what I do uses SNMPv2 (and I only allow access from the management port)
I may have to point you at the documentation - go to
http://www.extremenetworks.com/support/documentation-archives, scroll down and click on "Extreme XOS" (yes, it doesn't look like a clickable link, but it does actually expand when you click it), find the
User Guide that's appropriate for your switch's XOS version.
For instance for version 15.5, snmpv3 commands start around page 1314 of the PDF
The 15.6 user guide seems to have nice examples/walkthroughs starting around page 73 of the PDF, snmpv3 starting at page 83 - I'd probably use that guide if I'd have to set up v3
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Just so we don't forget, you did enable snmp (enable snmp / enable snmp access, etc.)?
Frank