SNMP Reference Guide
Table Of Contents
- Introduction
- Audience
- What’s New in this Release
- Introduction to the SNMP Reference Guide
- General Content
- Server Administrator Instrumentation MIB
- Server Administrator Remote Access MIB
- Server Administrator Baseboard Management Controller, ASF MIB
- Server Administrator Field Replaceable Unit MIB
- Server Administrator Storage Management MIB
- Server Administrator Change Management MIB
- Dell RAC Out-of-Band MIB
- How This Guide Defines Technical Terms
- SNMP Basic Terminology
- Frequently Used Terms in Variable Names
- Tables
- Reference Guide Content Tables
- Section Organization
- Other Documents You May Need
- Introduction to the Server Administrator SNMP Subagent
- Instrumentation MIB Version Group
- Systems Management Software Group
- Systems Management Software
- Systems Management Software Name
- Systems Management Software Version Number Name
- Systems Management Software Build Number
- Systems Management Software Description Name
- Systems Management Software Supported Protocol
- Systems Management Software Preferred Protocol
- Systems Management Software Update Level Name
- Systems Management Software URL Name
- Systems Management Software Language Name
- Systems Management Software Global Version Name
- Systems Management Software Feature Flags
- Systems Management Software SNMP Agent Feature Flags
- Systems Management Software Manufacturer Name
- Systems Management Software Variable Values
- Systems Management Software
- System State Group
- Chassis Information Group
- Operating System Group
- System Resource Group
- Power Group
- Thermal Group
- User Security Group
- Remote Flash BIOS Group
- Port Group
- Device Group
- Slot Group
- Memory Group
- BIOS Setup Control Group
- Local Response Agent Group
- Cost of Ownership Group
- Remote Access Group
- Cluster Group
- Baseboard Management Controller Group
- Field Replaceable Unit Group
- Storage Management Group
- Storage Management Group
- Storage Management Information Group
- Global Data Group
- Physical Devices Group
- Controller Table
- Channel Table
- Enclosure Table
- Array Disk Table
- Array Disk Enclosure Connection Table
- Array Disk Channel Connection Table
- Fan Table
- Fan Connection Table
- Power Supply Table
- Power Supply Connection Table
- Temperature Probe Table
- Temperature Probe Connection Table
- Enclosure Management Module Table
- Enclosure Management Module Connection Table
- Battery Table
- Battery Connection Table
- Logical Devices Group
- Storage Management Event Group
- Change Management Group
- Dell RAC Out-of-Band Group
- Product Information
- Chassis Status
- DRsGlobalSystemStatus
- DRsGlobalCurrStatus
- DRsIOMCurrStatus
- DRsKVMCurrStatus
- DRsRedCurrStatus
- DRsPowerCurrStatus
- DRsFanCurrStatus
- DRsBladeCurrStatus
- DRsTempCurrStatus
- DRsCMCCurrStatus
- DRsGlobalPrevStatus
- DRsIOMPrevStatus
- DRsKVMPrevStatus
- DRsRedPrevStatus
- DRsPowerPrevStatus
- DRsFanPrevStatus
- DRsBladePrevStatus
- DRsTempPrevStatus
- DRsCMCPrevStatus
- DRsIOMChangeTime
- DRsKVMChangeTime
- DRsRedChangeTime
- DRsPowerChangeTime
- DRsFanChangeTime
- DRsBladeChangeTime
- DRsTempChangeTime
- DRsCMCChangeTime
- Chassis Power
- CMC Power Information
- CMC PSU Information
- Chassis Alerts
- Legacy Alerting
- Traps
- Trap Variables
- Understanding the Trap Description
- Understanding Trap Severity
- Instrumentation Traps
- Miscellaneous Traps
- Temperature Probe Traps
- Cooling Device Traps
- Voltage Probe Traps
- Amperage Probe Traps
- Chassis Intrusion Traps
- Redundancy Unit Traps
- Power Supply Traps
- Memory Device Traps
- Fan Enclosure Traps
- AC Power Cord Traps
- Hardware Log Traps
- Processor Device Status Traps
- Pluggable Device Traps
- Battery Traps
- RAC Traps
- BMC Traps
- Storage Management Alert Reference
- Standard Data Type Definitions
- SNMP Sample Output
- Glossary
- Index
28 Introduction
SNMP Basic Terminology
It is important to have a good understanding of the key technical terms used
in this guide. This guide provides definitions for all essential terms used in
describing the Server Administrator MIBs. The Glossary contains definitions
for all essential terms and acronyms.
SNMP Master Agent
Typically, the SNMP agent on a managed system consists of one SNMP master
agent and zero or more SNMP extension agents. This SNMP agent extendable
structure facilitates the addition of new MIB modules without having to rebuild
the entire SNMP agent and is invisible to SNMP management applications.
The SNMP master agent is responsible for receiving SNMP request protocol
messages from SNMP management applications and sending SNMP response
protocol messages. As part of processing SNMP request protocol messages,
the SNMP master agent typically communicates with one or more SNMP
extension agents. This communication does not involve standard SNMP
protocol messages. The SNMP master agent uses an extension protocol that
shields the SNMP extension agent from the standard SNMP protocol
messages. The extension protocol also provides a way for SNMP extension
agents to send SNMP event notifications (called traps in SNMPv1).
The SNMP master agent is also responsible for sending SNMP event
notification protocol messages to SNMP management applications.
On supported operating systems, the SNMP master agent is provided with
the operating system. For example, on supported Microsoft
®
Windows
®
operating systems, the Windows SNMP service is the SNMP master agent.
For information on the versions of the SNMP protocol supported by the
SNMP master agent, see the operating system documentation.
SNMP Extension Agent
The SNMP extension agent is responsible for registering the MIB objects that
it supports with the SNMP master agent and then processing requests from
the SNMP master agent for those MIB objects. The SNMP extension agent
also initiates event notifications to the SNMP master agent. The SNMP
extension agent does not receive or send standard SNMP protocol messages.
The SNMP extension agent communicates with the SNMP master agent using
an extension protocol defined by the SNMP master agent.
The Server Administrator SNMP subagent is an SNMP extension agent.