Adds a new user to an SNMPv3 group and configures a plain
text password for the user.
Example:
Device(config)# snmp-server user user1 group1
v3 auth md5 password123 priv passwd123654
In SNMPv1 and SNMPv2, passwords were sent as a community string in clear text between managers and agents, leaving huge gaps in security.
First, the SNMP community string is a single identifier, unlike modern systems, which are based on a username and password. SMNPv3 uses a username and a password for security,
"Device(config)# snmp-server user user1 group1 v3 auth md5 password123 priv des passwd123654"
(Added a new user named "user1" to the SNMPv3 group "group1". User is configured for authentication (auth) using MD5 hashing algorithm with password "password123". In addition, user also has privacy (priv) enabled using the DES encryption algorithm with the privacy password "passwd123654".)
There are several authentication and privacy algorithms available for SNMPv3, such as MD5, SHA, DES, AES, and others.
"SNMPv3 is a security model in which an authentication strategy is set up for a user and the group in which the user resides".
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/snmp/configuration/xe-3se/5700/snmp-xe-3se-5700-book/nm-snmp-snmpv3.pdf
SNMPv2c use community string.
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