SNMP- Simple Network Management Protocol

 What is SNMP?

            SNMP is monitor protocol, Which is used do monitor 1000's Router/Switches.
In case of monitoring the router status of one or two routers manually it can be easily done by human but monitoring large number of router SNMP is used.
   



Main Principles Of SNMP!

         The SNMP uses two major principle to communicate with routers and known their status:  1) Manager SNMP
                        2) Agent SNMP

Manager SNMP:

          The devices/Software Which used to monitor the router/ switches status is Known as Manager SNMP.

Agent SNMP:

          What the managers are monitoring are known as agents SNMP (eg: Routers, Switches)

How it Works?

  • First we need to create the Database which contain all the information of Router/Switches(Agents).
  • Then by using Unique ID's we can fetch or monitor the information (eg: Hostname, Interface Status, Location, etc..,)
  • These identifiers are refers to Objects identifiers(ODI's)
This Whole  operation is refers to management Interface base (MIB's) 
   

 

Versions:

SNMPV1 - Uses Community String to Fetch information ( Like using Password as a key)
SNMPV2c - Uses Community String and Get Bulk , Get Next Message
SNMPV3 - Implies More Security management , (User name & Password is Mandatory) (Privacy & Authentication)

SNMP Messages:

Get Message:

       Any information needed we need to send a message from Manager to Agent (has two port) 1) Get Request - Send Message 
                           2) Get Response - Reply Message

Set Message:   

       Uses to changes the configuration of the devices

Trap Message: 

       If any issues happens agent sent a message to the manager

Inform Message: 

       Send the message until the agent receive it. 

                                  

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