OVNM 5.3 - Operations Agent for NonStop SNMP Adapter Guide

SNMP Adapter: An Introduction 8
1-5-2 SNMP Adapter Components
SNMP Adapter Architecture can be grouped into the following categories:
• Components on the HP NonStop Host
• TCP/IP Communication Channel
• Components on the Windows Workstation
1-5-2-1 Components on the HP NonStop Host
• XXEMN: EMON Service
SNMP Adapter provides open systems event monitoring of HP NonStop Servers. The Event Monitor process
($EMON) on a HP NonStop host receives events from the subsystems via an event collector and one or
more EMS (Event Management Service).
The EMON process resides on the HP NonStop host. Associated with this process are a configuration file
and a rules database.
NOTE: The EMON Service is part of OVNM installation and it is not required to be installed separately
for SNMP Adapter.
1-5-2-2 TCP/IP Communication Channel Components
Elink is an independent communications process residing on both HP NonStop Servers and the
workstations. SNMP Adapter uses Elink as the communication channel between the workstation and the HP
NonStop host(s). Acting as a gateway for the NonStop environment, the Elink host running on the NonStop
system passes structured information to the workstation through the Elink Client. It is the middleware
between EMON and the workstation’s SNMP Adapter processes.
1-5-2-3 Components on the Windows Workstation
• Adapter.conf File: This is the configuration file used for SNMP Adapter configurations. It is an input file that
contains various parameters for sending the traps to their destinations, for example, Trap Destination IP
Address and OID (Object Identifier).
• SNMP Adapter Service: This is the process that takes its input from the Adapter.conf file and checks for the
Event to appear on the Elink. As soon as the event appears it reads the information contained in the Event
and writes it in the SNMPTRAP file. After updating the SNMPTRAP file with event details and configuration
parameters, it invokes the TrapGen.exe process.
• SNMPTRAP File: SNMP Adapter Service writes the data in SNMPTRAP file, which in turn acts as an input file
for the TrapGen.exe process.
• TrapGen Process: This is the process that reads the updated SNMPTRAP file and generates the traps
according to the given data. These traps will be read by various SNMP Trap browsers (For example: NNM
and BMC Patrol) and are displayed on the machines where they are installed.
• SNMP Trap Browsers: SNMP Adapter is used to mange the NonStop events on SNMP Trap browsers like
NNM, BMC Patrol and Netcool.
• HTTP Trapgen Service: This is the process that reads the updated SNMPTRAP file and generates the traps
according to the given data. These traps will be read by various SNMP Trap browsers (For example: NNM
and BMC Patrol) and are displayed on the machines where they are installed. By default this service is
activated for all users, to deactivate this, mark this as FALSE in the Adapter.conf file. This service supports
the V2 and V3 level of traps also.
You can now select either the TrapGen Process or the HTTP Trapgen Service to generate traps.