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SNMPv3 uses an user-based security model (USM). USM requires a username and a password for authentication, and an optional additional password to encrypt the payload of the SNMP packet. Even without encryption, the authentication data is protected using either an MD5 or SHA hash.
Execute the commands to enable SNMPv3 read an IOS device. This configures the SNMPv3 authNoPriv using an MD5 hash authentication.
snmp-server group v3group v3 auth
snmp-server user v3user v3group v3 auth md5 v3pass123
snmp-server group v3group v3 auth write v1default