3Com RMON-EMP-3 installation and operation guide Ethernet Rmon Groups, Rmon Client

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RMON Client

The RMON Client consists of a management station running an application that uses SNMP (such as the 3Com ONdemand LANsentry™ software) to request data from the probe and display that data in various formats. You can also use the graphical interface to configure the RMON agent.

The client application does not have to be located on the same segments as the network to which the probe is assigned, but does need connectivity to the networks.

Ethernet RMON Groups

The Ethernet RMON standard is defined in Request For Comment (RFC) 1757 (formerly 1271). The goal of the standard is to ensure interoperability in multivendor environments. As defined by the RFC standards for Ethernet RMON, the Ethernet RMON specification identifies the following RMON groups:

Alarm Group - Allows you to define and set thresholds for various counters. If a counter reaches a predefined threshold, an event is generated. (See Event Group below.)

Event Group - Controls the action taken as a result of an event, (an event can be triggered by an alarm). For example, if a counter reaches a threshold, then a trap may be generated or an event may be logged.

Filter Group - Instructs the RMON MultiProbe Module to capture only those packets that match a specific criteria (such as IP Protocol or a specific MAC address).

History Group - Provides historical views of statistics based on predefined sampling intervals. This information illustrates traffic or error patterns, which can be useful in trend analysis.

Host Group - Contains statistical counters, grouped by MAC address, specific to each station on the network. This group also contains the order in which devices or stations were discovered.

Introduction 1 - 3

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Contents Page VDE Class B Compliance Restricted Rights Page Contents Configuring the Module Troubleshooting Page Figures Page Tables Page Audience How to Use This GuideStructure of This Guide Document Conventions Convention Indicates ExampleUsr/snm/agents Related Documents 3Com Documents Reference Documents Introduction Rmon Overview Rmon ArchitectureRmon Probe Rmon Client Ethernet Rmon GroupsPage Rmon MultiProbe Module Overview Rmon MultiProbe Module Features Other benefits of the Rmon MultiProbe Module include Theory of Operation Rmon Sample Application Sample ApplicationPage Installing the Module Precautionary Procedures Quick Installation Quick Installation StepsStep Procedure Chapter/Section Unpacking Procedures Installing the Rmon MultiProbe Module Rmon MultiProbe Module ONline System Concentrator Connecting a Terminal Initializing the Rmon MultiProbe Module Main Configuration Menu Monitoring the Front Panel Rmon MultiProbe Module Front Panel LEDs and Reset Button LED Name Color State Indicates Module LED InterpretationsModule LED Interpretations Page Configuring the Module Configuration Menu Overview Configuration Menu Flow Chart Configuration Menu Flow Chart Modifying Configuration Menu Values Using the Main Configuration Menu Main Configuration Menu Option Result Main Configuration Menu DescriptionDownload Menu Using the Download MenuDownload Menu Description Modify/View Configuration Values Menu Using the Modify/View Configuration Values MenuModify/View Configuration Values Menu Description Using the Modify/View Serial Configuration Values Menu Modify/View Serial Configuration Values Menu Modify/View Serial Configuration Values Menu Description Display the modem init string and enables you Command Result Modem Init Strings and Hangup StringsModem Init Strings and Hangup Strings Waits for the reply string that follows which is Modem Response Strings Connect Response String ExampleResponse code Bps rate No Carrier /BUSY/NO DIALTONE/NO ANSWER/ERROR Using the Modify/View Network Settings MenuModify/View Network Settings Menu Modify/View Network Settings Menu Description Using the Modify/View Network Interface Settings Menus Modify/View Network Interface 1 Settings Menu Modify/View Network Interface Settings Menu Description Assigning the Interface IP Address and Subnet Mask Configuring the Module and InterfacesConfiguring the Module 3 Assigning the Module Default Gateway Using Bootp to Configure the Module and Interfaces Bootp DescriptionBootp Configuration Process Bootp Requirements Using BootpSample BOOTPtab file Configuring the Module 3 Assigning Interfaces to Networks DIP Switch Location Using the DIP Switch to Assign NetworksSwitch Network Selection Setting Network Selection DIP Switch SettingsUsing Management Commands to Assign Interfaces to Networks SET Port 7.1 Network ETHERNET1 Management Command ExamplesShowing Module and Interface Configurations Show Module CommandSaving Network Assignments Show Port Command Backplane Re-initializing the Rmon MultiProbe Module Information Preserved Information Lost Warm-Starting the Rmon MultiProbe ModuleCold-Starting the Rmon MultiProbe Module Information Preserved Information Lost Page Troubleshooting Troubleshooting Startup Problems Diagnostic Tests and Interface Status LEDsDiagnostic Interface Troubleshooting Malfunctions Troubleshooting MalfunctionsSymptom Possible Cause Corrective Action Troubleshooting Malfunctions Troubleshooting Malfunctions If the LEDs Nvram Troubleshooting Network Connectivity Problems Technical Assistance Page Specifications Environmental Specifications Electrical SpecificationsGeneral Specifications Mechanical SpecificationsInterface Configuration Connectors and CablesPin RS-232 25-Pin Port Connector PinoutsRS-232 Crossover Cable for a PC or Terminal Sample Out-of-Band Connections Modem Cable PinoutsPage Using the Rmon MultiProbe Module Slip Address RS-232 Straight-Through Cable Table A-2. RS-232 Straight-Through Cable PinoutsModem MultiProbe Module Figure A-3. RS-232 Straight-Through Cable Pinouts RS-232 Null-Modem CableMemory Configuration Allocation Table A-3. Maximum Number of Entries for Ethernet TablesEthernet Table Maximum Number of Entries On-line Technical Support Technical SupportSupport from Your Network Supplier Email Technical SupportWorld Wide Web Site Support from 3Com Returning Products for Repair Accessing the 3Com MIB3Com Technical Publications Page Index LEDs, 2-11 monitoring, 2-10 reset button ONcore Distributed Management Module Pinouts, A-5 speed, 3-15 Serial Port Mode VDE compliance Warm start Configuration information