Allied Telesis AT-S63 - Manual (Page 284)

Chapter 20: SNMPv3 Commands
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Examples
The following command modifies the SecurityToGroup Table entry with
a user name of “nancy28.” The security model is the SNMPv3 protocol.
and the group name is set to engineering.
set snmpv3 group username=nancy28 securitymodel=v3
groupname=engineering
The following command modifies the SecurityToGroup Table entry with
a user name of “nelvid.” The security model is the SNMPv3 protocol and
the group name “systemtest.”
set snmpv3 group username=nelvid securitymodel=v3
groupname=systemtest