FIPS Mode Privacy Options Authentication OptionsDisabled des56 (DES56-CBC)aes128 (AES128-CFB)md5 (HMAC-MD5-96)sha (HMAC-SHA1-96)Enabled aes128 (AES128-CFB) sha (HMAC-SHA1-96)To enable security for SNMP packets transferred between the server and the client, you can use the snmp-server userusername group groupname 3 auth authentication-type auth-password priv aes128 priv-passwordcommand to specify that AES-CFB 128 encryption algorithm needs to be used.Dell(conf)#snmp-server user snmpguy snmpmon 3 auth sha AArt61wq priv aes128 jntRR59aIn this example, for a specified user and a group, the AES128-CFB algorithm, the authentication password to enable the server toreceive packets from the host, and the privacy password to encode the message contents are configured.SHA authentication needs to be used with the AES-CFB128 privacy algorithm only when FIPS is enabled because SHA is then theonly available authentication level. If FIPS is disabled, you can use MD5 authentication in addition to SHA authentication with theAES-CFB128 privacy algorithmYou cannot modify the FIPS mode if SNMPv3 users are already configured and present in the system. An error message is displayedif you attempt to change the FIPS mode by using the fips mode enable command in Global Configuration mode. You canenable or disable FIPS mode only if SNMPv3 users are not previously set up. If previously configured users exist on the system, youmust delete the existing users before you change the FIPS mode.Keep the following points in mind when you configure the AES128-CFB algorithm for SNMPv3:1. SNMPv3 authentication provides only the sha option when the FIPS mode is enabled.2. SNMPv3 privacy provides only the aes128 privacy option when the FIPS mode is enabled.3. If you attempt to enable or disable FIPS mode and if any SNMPv3 users are previously configured, an error message isdisplayed stating you must delete all of the SNMP users before changing the FIPS mode.4. A message is logged indicating whether FIPS mode is enabled for SNMPv3. This message is generated only when the firstSNMPv3 user is configured because you can modify the FIPS mode only when users are not previously configured. This logmessage is provided to assist your system security auditing procedures.Configuration Task List for SNMPConfiguring SNMP version 1 or version 2 requires a single step.NOTE: The configurations in this chapter use a UNIX environment with net-snmp version 5.4. This environment is onlyone of many RFC-compliant SNMP utilities you can use to manage your Dell Networking system using SNMP. Also, theseconfigurations use SNMP version 2c.• Creating a CommunityConfiguring SNMP version 3 requires configuring SNMP users in one of three methods. Refer to Setting Up User-Based Security(SNMPv3).Related Configuration Tasks• Managing Overload on Startup• Reading Managed Object Values• Writing Managed Object Values• Subscribing to Managed Object Value Updates using SNMPSimple Network Management Protocol (SNMP) 689
