Attempting to maintain SNMP v2c compatibility while implementing SNMP v3 on cisco switch 5506cx.

Would a user that was previously used for v2c see issues with v2c if it is added to a v3 group?

For instance:

snmp-server group myGroupName v2c
snmp-server user myUserName
snmp-server groupMyAuthPrivGroup v3 priv
snmp-server user myUserName groupMyAuthPrivGroup v3 auth..etc.

Would v2c have a problem with this user?

1 Answer 1


It will be part of a group with a higher priority. If you set a higher priority then set the lower one, you may face some errors like AUTHORIZATION_ERROR or unknownUserName which is the result of bad configuration.

As a result, it would be safe if you gain access to a user.

Check this link out to understand levels and priorities:

SNMP Version 3 Security Levels

  • Thanks for the input! Going to move ahead by creating a separate user for snmp v3.
    – Bryan
    Mar 1, 2020 at 6:45

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