How to visualize SNMP data using OSS ~Grafana x OcNOS~


This article introduces how to visualize SNMP (Simple Network Management Protocol) data using the Open Source Software (OSS) Grafana dashboard.

In the 9th article, I touched on the visualization of SNMP data using OSS, using SONiC as an example. I touched on OcNOS in the 4th article, so be sure to check that out as well.

Since OSS tools are used, there is no cost, and as long as you have a server running the tools and network devices to be monitored, you can view SNMP data that used to be viewed as text as a diagram.

There are other articles related to Open Networking, so please see the articles that interest you from the "List of articles" below.

What is SNMP?

First, I will explain the overview of SNMP for visualization.

SNMP is an application layer protocol for monitoring and controlling communication devices such as servers and switches via a network.
It consists of an SNMP manager on the managing side and an SNMP agent on the managed side as shown below, and exchanges information such as the number of discarded packets. The SNMP manager uses UDP Port = 162 and the SNMP agent uses UDP Port = 161.

SNMP operation image diagram

SNMP operation image diagram

What are MIBs?

Next, we will explain the MIB (Management Information Base) used to exchange information with SNMP.
MIB refers to a collection of device information held by the SNMP agent. This MIB includes information such as the number of packets received and the number of packets discarded, and by exchanging the MIB, it is possible to check the interface usage status, etc.

Additionally, the MIB has a tree structure. The information in the MIB is called an object and is assigned an OID (Object ID).

MIB tree structure diagram

MIB tree structure diagram


For example, each object is assigned an OID as shown below.


object OIDs explanation
SysName Device host name
interface Various information such as interface status and traffic
if In Octets Total number of bytes received by each Interface

Settings for various OSS tools

Next, we will explain the settings of the OSS tools used to visualize the SNMP data, using the simple network configuration diagram below as an example.

For an overview of various tools, please refer to the 9th article.

This time, I will introduce the setting for acquiring MIB information from the white Box switch using telegraf and saving it to influxDB. Also, for Grafana, we will introduce the procedure for logging in with a browser.

Simple network diagram

Simple network diagram

Edit telegraf configuration file

Edit the telegraf configuration file (telegraf.conf) with the following command to get SNMP MIB information from the whitebox Box. If the settings are reflected correctly, the MIB information of the whitebox Box will be acquired by telegraf and saved in i nfluxDB.

$ sudo vi /etc/telegraf/telegraf.conf


* The image below is an example of editing telegraf.conf. Agent is a white Box switch that outputs MIB information. Various setting items are as follows.

interval: Interval for collecting Agent data (MIB information)

Agent data collection interval

Agent data collectioninterval

url: influxDB url for output
database: Tool used for influxDB (telegraf)

output destination influxDB

Destination i nfluxDB

agents: IP of target device for data collection
timeout: Time to wait for a response after issuing a data collection request
version: SNMP version
agent_host_tag: the tag used to refer to the data host
community: SNMP community name for which you want to obtain data
retries: number of times to try retries

SNMP related settings – Agent IP, Timeout time, etc.

SNMP related settings– Agent​ ​IP, Timeout time, etc.

name: MIB object name
oid: OID of SNMP (this time set by name instead of number)

MIB information to retrieve – standard/extended MIB, etc.

MIB information to retrievestandard / extended MIB, etc.

service_address: UDP port number

SNMP Trap settings – UDP Port, Timeout, SNMP ver., etc.

SNMP Trap settings– UDP Port, Timeout, SNMP ver., etc.

Start telegraf, influxDB and Grafana

Start various OSS tools on the Ubuntu server.

$ sudo systemctl daemon-reload
$ sudo systemctl start influxdb.service
$ sudo telegraf --config /etc/telegraf/telegraf.conf &
$ sudo systemctl start grafana-server.service

Check access to influxDB

Access on the web to check if you can access influxDB.

* Since the version used this time does not support GUI, it is displayed as 404 page not found. (Access itself is successful.)

Check access to Grafana

Check whether you can access Grafana by accessing on the web in the same way as influxDB.
For the first access, use the User and Password below.

User: admin
Password: admin

*When you log in, you will be asked to change your password.

Grafana home screen

Grafana​ ​home screen

Grafana dashboard visualization example

Grafana By setting up a dashboard using the create dashboard method, it is possible to display various information about the switch, such as:

The following information is included in the display contents of the visualization example below.

・Switch activation time
・Interface link information and connection information
・Fan speed
CPU load information such as temperature and usage rate
・All traffic that passed through the interface or specific packets (Unicast packets, etc.) only traffic information

Dashboard visualization example

Dashboard visualization example

The above is an example of settings for obtaining MIB information of a white Box switch using SNMP and visualization of the Grafana dashboard.

In Part 11, I will introduce how to create a Grafana dashboard.

At the end

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Remote verification service image diagram

Remote verification service image diagram

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