HP XP20000/XP24000 HP StorageWorks XP24000/XP20000 SNMP Agent Reference Guide - Page 5

Overview of SNMP, SNMP Manager Overview, SNMP Manager and SNMP Agent Interaction

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1 Overview of SNMP This chapter provides an overview of SNMP including an overview of the agent and management functions: • "SNMP Manager Overview" (page 5) • "SNMP Agent Overview" (page 6) • "SNMP Manager Functions" (page 8) Unless otherwise specified, the term storage system in this guide refers to the following disk arrays: • HP StorageWorks XP24000 Disk Array • HP StorageWorks XP20000 Disk Array The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer browser. Actual windows may differ depending on the operating system and browser used. GUI contents also vary with licensed program products, storage system models, and firmware versions. SNMP Manager Overview SNMP Manager and SNMP Agent Interaction The following figure shows an SNMP environment. Figure 1 SNMP Environment SNMP is an industry-standard protocol for managing and monitoring network devices, including disk devices, routers, and hubs. SNMP uses SGMP to manage the TCP/IP gateways. The standardized configuration and database of network management information is called a MIB. A standard MIB is common to all SNMP interfaces. An extension MIB is defined by the particular managed device or protocol. An SNMP manager monitors the devices, which are referred to as managed nodes. The primary types of interaction between the SNMP manager and an SNMP agent are polling and trap. Typically, the SNMP manager polls the SNMP agents on a periodic basis, to determine whether the device is operating normally. If an abnormal event occurs, the SNMP Agent can report the condition without a request from the manager, by using a message called trap. When an SNMP Manager polls the agent, the following dialog takes place: • An SNMP manager sends a request packet to an SNMP agent, which requests data regarding the status of managed node. • The SNMP agent sends a response packet back to the SNMP manager. SNMP Manager Overview 5

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1 Overview of SNMP
This chapter provides an overview of SNMP including an overview of the agent and management
functions:
•
“SNMP Manager Overview” (page 5)
•
“SNMP Agent Overview” (page 6)
•
“SNMP Manager Functions” (page 8)
Unless otherwise specified, the term
storage system
in this guide refers to the following disk arrays:
•
HP StorageWorks XP24000 Disk Array
•
HP StorageWorks XP20000 Disk Array
The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer
browser. Actual windows may differ depending on the operating system and browser used. GUI
contents also vary with licensed program products, storage system models, and firmware versions.
SNMP Manager Overview
SNMP Manager and SNMP Agent Interaction
The following figure shows an SNMP environment.
Figure 1 SNMP Environment
SNMP is an industry-standard protocol for managing and monitoring network devices, including
disk devices, routers, and hubs. SNMP uses SGMP to manage the TCP/IP gateways.
The standardized configuration and database of network management information is called a
MIB. A standard MIB is common to all SNMP interfaces. An extension MIB is defined by the
particular managed device or protocol.
An SNMP manager monitors the devices, which are referred to as managed nodes. The primary
types of interaction between the SNMP manager and an SNMP agent are
polling
and
trap
.
Typically, the SNMP manager polls the SNMP agents on a periodic basis, to determine whether
the device is operating normally. If an abnormal event occurs, the SNMP Agent can report the
condition without a request from the manager, by using a message called trap.
When an SNMP Manager polls the agent, the following dialog takes place:
•
An SNMP manager sends a request packet to an SNMP agent, which requests data regarding
the status of managed node.
•
The SNMP agent sends a response packet back to the SNMP manager.
SNMP Manager Overview
5