Hello.
A while ago the question, but still interesting today and for others in this community.
To filter out authentication traps on the switch (prevent from being sent) i.e. for netlogin login, logout and failures you just need to exclude the corresponding MIB OID of the trap from the defaultNotifyView or whatever mib-view name you are use.
An example:
configure snmpv3 add mib-view defaultNotifyView subtree 1.3.6.1.4.1.1916.4.3.0.4 type excluded
configure snmpv3 add mib-view defaultNotifyView subtree 1.3.6.1.4.1.1916.4.3.0.5 type excluded
configure snmpv3 add mib-view defaultNotifyView subtree 1.3.6.1.4.1.1916.4.3.0.6 type excluded
Hope this helps a lot of people in this case.
Kind regards,
Markus