Send SNMP events to your Splunk deployment
Simple Network Management Protocol (SNMP) traps are alerts that remote devices send out. This topic describes how to send SNMP traps to a Splunk deployment.
Note: The procedures shown in this topic (for both *nix and Windows) are examples only. There are a number of ways to send SNMP traps to a Splunk deployment. For example, instead of using Net-SNMP, you can use other tools, such as Snare or SNMPGate, to write SNMP traps to files that you can monitor.
How to index SNMP traps
For Splunk Cloud, the most effective way to index SNMP traps is to write the data to a file that is monitored by the Splunk Universal Forwarder.
To configure the Universal Forwarder to consume a SNMP trap data:
1. Configure the remote devices to send their traps directly to the Splunk Universal Forwader. The default port for SNMP traps is
2. Write the SNMP traps to a file on the Universal Forwarder instance, using the instructions for sending them to a Splunk Enterprise instance Write SNMP traps to a file on the Universal Forwarder.
3. Configure the Universal Forwarder to monitor the file, as described in "Monitor files and directories".
Note: This topic does not cover SNMP polling, which is a way to query remote devices.
Write SNMP traps to a file on the Universal Forwarder
On *nix, you can use the Net-SNMP project
snmptrapd binary to write SNMP traps to a file.
Before you install
snmptrapd on your system, see the local documentation for the version of
snmptrapd that comes with your distribution of *nix. See also the manual page for
The simplest configuration is:
# snmptrapd -Lf /var/log/snmp-traps
Note: Versions 5.3 and later of
snmptrapd apply access control checks to all incoming notifications instead of accepting and logging them automatically (even if no explicit configuration was provided). If you run
snmptrapd without suitable access control settings, then it does not process those traps. You can avoid this by specifying:
# snmptrapd -Lf /var/log/snmp-traps --disableAuthorization=yes
To see the version of
snmptrapd --version from the command prompt.
Troubleshoot problems with SNMP
If you experience problems sending SNMP traps to your Splunk deployment, consider that:
- UDP port 162 is a privileged network port. If you need to use this port, then you must run
- You can use the
-fflag to keep
snmptrapdin the foreground while testing.
- You can use the
-Loflags instead of
-Lfto log to standard output.
- You can use the
snmptrapcommand to generate an example trap, as in:
# snmptrap -v2c -c public localhost 1 1
To log SNMP traps to a file on Windows.
1. Download and install the latest version of
NET-SNMP for Windows from the NET-SNMP website.
Note: The OpenSSL library must not be installed on the system because it conflicts with NET-SNMP.
snmptrapd as a service using the script included in the
snmpTrapdAddr [System IP]:162 authCommunity log [community string]
4. The default log location is
Use Management Information Bases (MIBs)
Management Information Bases (MIBs) provide a map between numeric object IDs (OIDs) reported by the SNMP trap and a textual human readable form. Though
snmptrapd can work without any MIB files at all, it won't display the results in exactly the same way.
The vendor of the device you receive SNMP traps from can provide a specific MIB. For example, all Cisco device MIBs can be located using the online Cisco SNMP Object Navigator.
To add a new MIB file:
1. Download and copy the MIB file into the MIB search directory. On the *nix version of Net-SNMP, the default location is
/usr/local/share/snmp/mibs. You can set a different directory by providing the
-m argument to
snmptrapd to load the MIB(s) by passing a colon-separated list to the
- If you add a leading '+' character for the parameters in the
snmptrapdloads the MIB in addition to the default list, instead of overwriting the list.
- The special keyword
snmptrapdto load all MIB modules in the MIB directory.
For example, to load all MIB modules in the MIB directory:
snmptrapd -m +ALL
How Splunk Cloud handles syslog data over UDP
Monitoring Windows data with Splunk Enterprise
This documentation applies to the following versions of Splunk Cloud™: 7.2.4, 7.2.6, 7.2.7, 7.2.8, 7.2.9