How to configure SNMP v3 on Cisco Switch, Router, ASA, Nexus (bestmonitoringtools.com)
Enter configuration mode
enable conf t
Everything in bold you should look at changing.
snmp-server view ViewDefault iso include snmp-server group GroupName v3 priv read ViewDefault snmp-server location address snmp-server user MyUsername GroupName v3 auth sha AuthPass1 priv aes 128 PrivPass
Exit and save changes
exit write
Now we can verify the snmp details with
show snmp