Hitachi VSP 5000 Series - Management Information Base Overview; SNMP Agent Configuration

An SNMP manager monitors the devices, which are referred to as managed nodes.
Typically, an SNMP Manager polls the SNMP agents on a periodic basis. The manager
receives the reports from the agents and determines whether the devices are operating
normally. If an abnormal event occurs, an SNMP Agent can report the condition without
a request from the manager, by using a trap message.
When an SNMP manager polls an agent, the following dialogue takes place:
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An SNMP Manager sends a request packet to an SNMP Agent, which requests data
regarding the status of the managed node.
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The SNMP Agent sends a response packet back to the SNMP Manager.
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SNMP uses the TCP/IP User Datagram Protocol (UDP). If the SNMP Agent does not
respond within a specied time period, the SNMP Manager re-sends the request
packet. That time period is set by the system administrator, taking into account the
network trac and operation policy.
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If an SNMP Agent again does not respond to the resent packet, the SNMP Manager
assumes that an error has occurred. Depending on the times set for polling and
response, this dialogue can take several seconds.
If an SNMP Agent detects an abnormal event, it sends a trap to the SNMP Manager.
However, if a trap is dropped in transmission, the SNMP Manager does not know that it
was sent. For this reason, you should use both polling and traps to determine whether
an abnormal event has occurred.
Management Information Base overview
The standardized conguration and database of network management information is
called a Management Information Base (MIB). A standard MIB is common to all SNMP
interfaces. An extension MIB is dened by the particular managed device or protocol.
A MIB is a collection of standardized conguration and network management
information that is contained in each device on the network. Each MIB contains a set of
parameters called managed objects. Each managed object consists of a parameter
name, one or more parameters, and a group of operations that can be executed with the
object. The MIB denes the type of information that can be obtained from a managed
device, and the device settings that can be controlled from a management system.
The MIB denition le, VSP5KMIB.txt, is located in the program\SNMP folder of the
software media kit.
SNMP Agent configuration
The SNMP Agent is installed on the service processor (SVP), which is the computer within
the storage system that manages the storage system.
The storage system has an exclusive LAN for communications with the SVP and a
separate LAN for SNMP. The conguration of each Network Management Station is
determined by the type of SNMP manager.
The following gure illustrates the SNMP environment.
Management Information Base overview
Chapter 6: SNMP overview
Hitachi Alert Notication Guide for VSP5000 Series 38