Setup Guide

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
FIPS mode only if SNMPv3 users are not previously set up. If previously configured users exist on the system, you must 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 is displayed
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 first SNMPv3
user is configured because you can modify the FIPS mode only when users are not previously configured. This log message is provided
to assist your system security auditing procedures.
Configuration Task List for SNMP
Configuring 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 only
one of many RFC-compliant SNMP utilities you can use to manage your Dell EMC Networking system using SNMP. Also,
these configurations use SNMP version 2c.
• Creating a Community
Configuring 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 SNMP
• Copying Configuration Files via SNMP
• Manage VLANs Using SNMP
• Enabling and Disabling a Port using SNMP
• Fetch Dynamic MAC Entries using SNMP
• Deriving Interface Indices
• Monitor Port-channels
Important Points to Remember
• Typically, 5-second timeout and 3-second retry values on an SNMP server are sufficient for both LAN and WAN applications. If you
experience a timeout with these values, increase the timeout value to greater than 3 seconds, and increase the retry value to greater
than 2 seconds on your SNMP server.
• User ACLs override group ACLs.
Set up SNMP
As previously stated, Dell EMC Networking OS supports SNMP version 1 and version 2 that are community-based security models.
The primary difference between the two versions is that version 2 supports two additional protocol operations (informs operation and
snmpgetbulk query) and one additional object (counter64 object).
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Simple Network Management Protocol (SNMP)