you setup traps on the device to send messages to rsyslog.

But I doubt that you can set it up to send ALL log messages out that way.

Rsyslog has a module that can listen for SNMP Trap messages that are sent by other devices.

David Lang

On Thu, 11 Apr 2013, Josh Bitto wrote:


I don't fully understand your response. I have to setup a trap on the switch (to send logs to server) OR on the server side(to receive logs from switch)? I'm still a little confused on how rsyslog works with this.



-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of David Lang
Sent: Thursday, April 11, 2013 10:47 AM
To: rsyslog-users
Subject: Re: [rsyslog] snmp on linux with rsyslog

On Thu, 11 Apr 2013, Josh Bitto wrote:

I'm starting to add devices from our network to forward logs and I came across 
a switch that uses snmp....I looked at the documentation on the website and had 
a couple of questions.

1.      Will ryslsog use V3 of snmp?
2.      When adding the module to the rsyslog config to receive traffic from 
said device is a trap necessary or can I just load a module and have a source 
IP and port number configured to send logs to a specific file?

SNMP has two modes of operation

1. SNMP Query. the device listens for SNMP requests and responds with the 
appropriate information

2. SNMP Traps. The device sends a message out under a specific condition.

In neither case are all the logs on the device sent over SNMP.

If you do not configure traps, nothing will be sent to the rsyslog server.

I don't know if rsyslog supports SNMPv3 or not.

Traps are designed to be alerts for critical failures, while it's good to get 
them, you probably want more data and really want the device to send it's logs 
to you. Once you have the device sending it's logs, you will probably find that 
the data that's in the traps is also in the log.

David Lang
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