Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 834

MIBs are hierarchically structured and use object identifiers to address managed objects, but managed objects also have a textual name called an object descriptor. You can download the latest MIB files from the following path: • https://www.force10networks.com/CSPortal20/Main/SupportMain.aspx. Implementation Information The following describes SNMP implementation information. • Dell Networking OS supports SNMP version 1 as defined by RFC 1155, 1157, and 1212, SNMP version 2c as defined by RFC 1901, and SNMP version 3 as defined by RFC 2571. • Dell Networking OS supports up to 16 trap receivers. • Dell Networking OS implementation of the sFlow MIB supports sFlow configuration via SNMP sets. • SNMP traps for the spanning tree protocol (STP) and multiple spanning tree protocol (MSTP) state changes are based on BRIDGE MIB (RFC 1483) for STP and IEEE 802.1 draft ruzin-mstp-mib-02 for MSTP. SNMPv3 Compliance With FIPS SNMPv3 is compliant with the Federal information processing standard (FIPS) cryptography standard. The Advanced Encryption Standard (AES) Cipher Feedback (CFB) 128-bit encryption algorithm is in compliance with RFC 3826. SNMPv3 provides multiple authentication and privacy options for user configuration. A subset of these options are the FIPS-approved algorithms: HMAC-SHA1-96 for authentication and AES128-CFB for privacy. The other options are not FIPS-approved algorithms because of known security weaknesses. The AES128-CFB privacy option is supported and is compliant with RFC 3826. The SNMPv3 feature also uses a FIPS-validated cryptographic module for all of its cryptographic operations when the system is configured with the fips mode enable command in Global Configuration mode. When the FIPS mode is enabled on the system, SNMPv3 operates in a FIPS-compliant manner, and only the FIPS-approved algorithm options are available for SNMPv3 user configuration. When the FIPS mode is disabled on the system, all options are available for SNMPv3 user configuration. The following table describes the authentication and privacy options that can be configured when the FIPS mode is enabled or disabled: Table 89. Authentication and Privacy Options FIPS Mode Privacy Options Disabled des56 (DES56-CBC) aes128 (AES128-CFB) Enabled aes128 (AES128-CFB) Authentication Options md5 (HMAC-MD5-96) sha (HMAC-SHA1-96) sha (HMAC-SHA1-96) To enable security for SNMP packets transferred between the server and the client, you can use the snmp-server user username group groupname 3 auth authentication-type auth-password priv aes128 priv-password command 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 jntRR59a In this example, for a specified user and a group, the AES128-CFB algorithm, the authentication password to enable the server to receive 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 the only available authentication level. If FIPS is disabled, you can use MD5 authentication in addition to SHA authentication with the AES-CFB128 privacy algorithm You cannot modify the FIPS mode if SNMPv3 users are already configured and present in the system. An error message is displayed if you attempt to change the FIPS mode by using the fips mode enable command in Global Configuration mode. You can enable or disable 834 Simple Network Management Protocol (SNMP)