Viglen LX275 Specifications download pdf (Page 15)

In addition to responding to SNMP GET and SNMP SET requests, the SNMP subagent generates

TRAPs. While one component of the SNMP subagent waits for SNMP requests from the SNMP

Master Agent, another component of the SNMP subagent monitors the System Event Log (SEL).

Entries are placed in the SEL when significant events occur on the server, such as when a

temperature sensor’s reading exceeds a threshold, or when a power supply is removed. When a

new SEL entry is detected, the SNMP subagent analyzes the SEL entry and sends SNMP TRAPs to

the SNMP Master Agent. The SNMP Master Agent duplicates and transmits the SNMP TRAP to

all nodes that are configured to receive traps from the managed server. You must configure trap

recipients as part of installing and configuring the SNMP Master Agent.

The SNMP subagent uses a Platform Management Abstraction Layer (PMAL) and the IPMI driver

to access the information from the BMC, such as information about power supplies, voltages,

temperature sensors, cooling devices, chassis intrusion sensors, and the SEL. The information

regarding processors and memory are stored in the SMBIOS tables and are accessed through either

the IPMI driver or through direct memory mapping.

Features of the Baseboard SNMP Subagent

Through basic SNMP GETs, SETs, and TRAPs, the SNMP subagent provides the following

functionality for managing servers:

• Accessing sensor data

• Viewing and modifying threshold settings

• Reading the SMBIOS tables

• Providing overall system health status

Accessing Sensor Data

The SNMP subagent accesses management information through IPMI commands that the BMC on

the managed server responds to. The information available varies by platform. For example, some

servers don’t support chassis intrusion detection, and some don’t support server monitoring of

redundant fans, although individual fans are monitored. The SNMP subagent’s Management

Information Base (MIB) is designed to support the following list of components:

• Voltage

• Temperature

• System Fan (includes redundancy)

• Memory

• Processor

• Power Supply (includes redundancy)

• PCI Hot Plug Events

• Chassis

Events are generated by the SNMP agent based on SEL events and provide as much information as

possible concerning the event to the event reader. The events use the NOTIFICATION-TYPE

construct specified in SNMPv2C.

Installing and Configuring the Intel

Server Manager 8 SNMP Subagents 15

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Viglen LX275 Specifications Page 15