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SNMP Overview

SNMP is an industry-standard set of protocols for network management in TCP/IP network environments. It provides mechanisms for monitoring and controlling terminals from a central location.

Using SNMP from a network host, you can:

SNMP Components

SNMP consists of four interrelated parts:

The NCDware distribution also includes two utilities: ncdreset(1) for remotely resetting terminals and ncdquery(1) for displaying the values of certain NCD-specific variables.

How SNMP Works

NCD terminals respond to queries from hosts running SNMP management software. Manager hosts have read/write access; monitor hosts have read-only access; and trap monitors receive information about significant events.

The SNMP manager initiates information gathering by sending a request for information to the SNMP agent in the terminal. When the request is received, the agent collects data as specified in the MIB and sends it to the manager. Using SNMP utilities, the system administrator can read or write variables.

NCDware provides an access control mechanism that you can use to prevent read/write or read-only access to the SNMP agent from outside the terminal or restrict access to a specified list of hosts. Both levels of access are further controlled by passwords called community names.

MIB Contents

All of the mandatory variables are included in NCD's SNMP agent except for the ifAdminStatus variable. Read-only access is provided for this variable, but write access can cause security problems and is not necessary on NCD terminals, which have only one network interface.

The NCDware MIB file contains SNMP variables for all NCD configuration parameters. Each configuration parameter has a unique SNMP variable name and path; for example, the SNMP variable name and path for the boot-desired-source parameter are: ncdBootDesiredSource and ncdBoot 5.

The SNMP variable name and path for each parameter are listed in the Remote Configuration Parameter Quick Reference.

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