Posts Tagged "High Availability"

Business continuity and high availability planning focuses on keeping your organization productive and preventing business down-time. Computer network protocols such as SNMP help in achieving this goal through continuous system health monitoring that enables pre-emptive maintenance before a system or network outage occurs.

SNMP version 2 increases security by defining two additional authentication layers but still uses the same community string clear text authentication specified by SNMP version 1.

SNMP version 3 further increases security by including encrypted authentication, password hashes and directory services integration support. The SNMP version 3 protocol also includes features that enable system monitoring of multiple locations through integration with an organization’s directory services (such as Microsoft Active Directory).

SNMP deployment, when configured to send traps and allow SNMP polling to a central location, decreases system downtime potential by alerting system administrators when a host or network device may fail and is operating outside the acceptable performance range. SNMP also tracks maintenance needs (such as gradual system internal temperature increases) so that maintenance (such as hot swapping running hard drives plagued with bad sectors or clean fan filters) occurs before a failure occurs, saving the organization costly down-time.

The Simple Network Management Protocol (SNMP) is a key ingredient for business continuity and achieving zero down-time because SNMP provides performance monitoring and management services for nearly any device that connects to a TCP/IP network. SNMP enables IT managed services to monitor and maintain all network resources from a central location, providing cost savings in down-time and IT staffing.

Contact us to learn more about how IT managed services maintains business continuity through system monitoring and pre-emptive maintenance.


The primary purpose of information technology networking and associated protocols is to deliver services such as email, Internet access, and business information system access with high availability and highly responsive performance and zero down-time. Accomplishing this lofty feat requires IT managed services visibility into the health status of every device connected to the network. SNMP (Simple Network Management Protocol) monitors and report the health of networked devices over TCP/IP via both polling mechanisms (SNMP Get) and connection-less notifications (SNMP Traps), and is built-in to most operating systems by default.

SNMP Details

There are three primary versions of SNMP. All three SNMP versions use a hierarchical structure called a MIB (Management Information Base) to manage collections of health status objects that require monitoring. The SNMP protocol also includes a set of default MIBs for monitoring TCP/IP and other items common to all devices that use SNMP. Each device can also support MIBs that specify monitoring of health status items specific to that device and the device specific feature set outside the scope of the default MIBs included with SNMP (such as monitoring the health of a custom web application service).

SNMP version 1 specifies an architecture that includes a Network Management Station (NMS) that runs software configured to poll SNMP devices for health status updates and receive SNMP “trap” messages when major changes in health status occurs. Version 1 also specifies a management agent which runs on each monitored device and answers SNMP polling requests sent from a network management station, monitors and updates device status, and sends traps to the network management station when specific device health measurement parameters, such as temperature or fan speed, are outside of the acceptable range. SNMP version 1 also specifies a security mechanism in which each device participating in SNMP on the network must present a “community string” (which is a type of clear text shared password) to poll or send messages. The more widely used SNMP version 2 and SNMP version 3 improve the protocol’s security mechanism, as discussed in the next post.

For more information on how IT managed services and system monitoring can improve your organization’s network up-time, contact us today.


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