How SNMP Works | Network Fundamentals Part 24

We can manage proactively, and we can manage reactively. SNMP is a protocol that can help us with both.

A management server will use SNMP polling to collect information from devices on our network. This builds charts and dashboards to help us evaluate the health of our network.

If a device has a problem, it may even send an SNMP trap to the management server. The server can then take an appropriate action, like alert us.

SNMP information is stored in a hierarchical structure called a MIB (Management Information Base). This is a collection of objects called OIDs (Object Identifiers). These describe the information that can be collected from devices, and how to interpret it.

When a poll is sent, the server will also specify a community string. This string is a simple form of authentication. Unfortunately, it is stored in plan-text, both in the message and in the configuration.

There are three versions of SNMP. v1 came first, and v2 extended this by adding support for 64-bit counters. v3 added real authentication and encryption. v3 is recommended in most cases.



Overview of this video:

0:00 Introduction

0:56 Polling and Traps

3:05 MIBs and OIDs

5:06 Community Strings

6:29 Versions

8:12 Configuration


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