3Com 3 7

7STATUS MONITORING AND

STATISTICS

This chapter contains details of the features that assist you with status

monitoring and statistics.

For detailed descriptions of the web interface operations and the

command line interface (CLI) commands tha t you require to manage the

Switch please refer to the Management Interface Reference Guide

supplied in HTML format on the CD-ROM that accompanies your Switch.

RMON Using the RMON capabilities of a Switch allows you to improve your

network efficiency and reduce the load on your network.

This section explains more about RMON. It cov ers the following topics:

■What is RMON?

■Benefits of RMON

■RMON and the Switch

■Hardware Status Monitoring

What is RMON? RMON is a system defined by the IETF (Internet Engineering Task Force)

that allows you to monitor the traffic of LANs or VLANs.

RMON is an integrated part of the Switch software agent and continually

collects statistics about a LAN segment or VLAN, and transfers the

information to a management workstation on reque st or when a

pre-defined threshold is crossed. The workstation does not have to be on

Contents

Main 3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145 C ABOUT THIS GUIDE 1 2 3 4 5 6 7 8 9 A B C G I A BOUT T HIS G Conventions Tabl e 1 Notice Icons Tabl e 2 Text Conventions Related Documentation Documentation Comments Product Registration I Page 1 What is Management Software? Switch Features Explained Page Page Page Page Page 2 Port Features Page Page Aggregated Links Page Page Page Page 3 What is an IP Multicast? Multicast Filtering Page IGMP Multicast Filtering Page Page 4 Spanning Tree Protocol (STP) What is STP? Page How STP Works Page Page Page Page Page Default Behavior Using STP on a Network with Multiple VLANs Page Page 5 What is the Switch Database? How Switch Database Entries Get Added Switch Database Entry States 6 What is Traffic Prioritization? How Traffic Prioritization Works Page Traffic Prioritization and your Switch Page Page 7 S RMON What is RMON? Benefits of RMON RMON and the Switch Page Page Hardware Status Monitoring Hardware Status Monitoring 59 Figure13 Example CLI screen text Figure14 Example of an individual unit system summary screen Page 8 What are VLANs? Benefits of VLANs VLANs and Your Switch Page Page VLAN Configuration Page Page 9 How Your Switch Obtains IP Information How Automatic IP Configuration Works Page Important Considerations II Page A Configuration Rules for Gigabit Ethernet Gigabit Ethernet is designed to run over several media: (3.1 miles). Support for distances over 5 km is supp orted depending on the module specification. The different types of Gigabit Ethernet media and their s pecifications are detailed in Tabl e 7. Configuration Rules for Fast Ethernet Page Page B Simple Network Configuration Simple Network Configuration Examples 81 Collapsed Backbone Switch Example DualSpeed Hub 500 Switch4400 stack Switch4200 stack Figure22 Using the Switch 4200 as a collapsed backbone Page Advanced Network Configuration Page C IP Addresses Page Page Subnets and Subnet Masks Page Default Gateway s G Page Page Page Page Page Page Page Page Page I Numbers A B C L M N O P T V