Protocol Overview
Network management stations use SNMP to retrieve or alter management data from network elements.
A datum of management information is called a managed object; the value of a managed object can be static
or variable. Network elements store managed objects in a database called a management information base
(MIB).
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:
Simple Network Management Protocol (SNMP) 980
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