HP 226824-001 - ProLiant - ML750 Introduction Manual - Page 7

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SNMP Services

The SNMP Services enable the flow of basic management information between the managed server

and HP SIM. These components process SNMP Gets and Sets, as well as the SNMP Traps used in

alerting.

The Microsoft SNMP Agent Service provides the core set of SNMP services used by the Insight

Management system on the managed server. The following services are included:

 Fulfillment of SNMP Gets to deliver information from the HP MIB to authorized requesting services.

In the Insight architecture, MIB information is typically requested from the SIM server or from a

process associated with the SMH framework.

 Processing of SNMP Sets, which are used to change SNMP configuration information as well as

alert thresholds for server management information.

The Microsoft SNMP Agent Service provides a standard SNMP interface to external processes.

However, its internal structure is very specific, using its own set of application program interfaces

(API's). The HP Insight Agents are specifically designed to work with the Microsoft SNMP Agent

Service and will not interoperate with other SNMP stacks.

The Management Information Base defines all of the information collected about the managed system.

In the HP Insight Architecture, the four Insight Agents collect the MIB information and store it in an

extension to the Windows Registry. When MIB information is requested, the Microsoft SNMP Agent

Service uses the Insight Agents to retrieve information from the Windows Registry before delivering it

to the requesting process, typically the HP SIM server or the System Management Homepage.

The SNMP protocol provides basic security and access authorization through the use of community

strings. However, standard SNMP protocol does not encrypt the community strings or the

management information that it sends or receives. This leaves the information vulnerable to being

intercepted (snooped) over the network. The HP Insight Management framework provides a more

secure management environment by establishing a separate certificate-based SSL communication

channel between the SIM server and the managed server. This channel is actually a part of the SMH

framework, and it used by the Insight Management framework as the transport mechanism for all

secure information. Other, less sensitive information is still sent to the HP SIM server over standard

SNMP from the Microsoft SNMP Agent Service.

To further enhance security, at installation, the Insight Management Agents architecture configures the

Microsoft SNMP Agent Service to restrict SNMP writes to the local host only. This prevents any

external agent from being able to execute writes to the managed server. The HP SIM server is still

able to implement SNMP Sets since its commands are sent over the encrypted link and are actually

executed locally.