Wednesday, November 28, 2007

Configuring SNMP in routers

Hi Friends,

This articles explains the role of SNMP in the networks and also how to configure SNMP in the router to get the monitoring updates from the client using the tools like PRTG traffic analyser, etc.

The Simple Network Management Protocol (SNMP) is an application layer protocol that facilitates the exchange of management information between network devices. It is part of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. SNMP enables network administrators to manage network performance, find and solve network problems, and plan for network growth.

SNMP Versions:

Version 1 has been criticized for its poor security. The passwords are sent in cleartext.


It revises version 1 and includes improvements in the areas of performance, security, confidentiality, and manager-to-manager communications.


SNMPv3 provides three important services: authentication, privacy and access control.

Configuring SNMP Access in Routers:

Router(config)#snmp-server community public RO

Router(config)#snmp-server community private RW

Configuring SNMP Traps in Routers:

Router(config)#snmp-server host public

Router(config)#snmp-server enable traps

In case accessing this snmp from the windows client machine, should enable snmp service from the add or remove components. Having the firewall in between the client and router device will disturb the connection. Configure the firewall so that the respective port numbers are open.


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