Use snmp-server as the main command.

C3750(Config)#snmp-server community RO

This is the shared secret for SNMP communication. RO means Read Only (SNMP tools are not allowed to modify settings). RW means Read and Write (SNMP tools can modify settings).

C3750(config)#snmp-server group SNMP_ROA v3 priv match exact

  1. SNMP group name: SNMP_ROA
  2. Version: v3
  3. Highest priv level

C3750(config)#snmp-server user cater SNMP_ROA v3 auth MD5 cisco12345 priv des56 test12345

This is related to PRTG configuration and must be recorded correctly.

  1. User: cater
  2. Group: SNMP_ROA
  3. Auth mode: MD5
  4. Auth password (MD5): cisco12345 (PRTG requires at least 8 characters)
  5. Priv password: test12345 (PRTG requires at least 8 characters)

C3750(config)#snmp-server host 192.168.3.100 version 3 priv cater

  1. SNMP server: 192.168.3.100
  2. Use version 3
  3. Use priv mode with user cater