Cabletron Systems SmartSwitch manual Using Rmon

Chapter 21: RMON Configuration Guide

A row in the control table is created for each port on the SSR, with the owner set to “monitor”. If you want, you can change the owner by using the appropriate rmon command. See the section “Configuring RMON Groups” in this chapter for more the command to configure a specific group.

Note: Control tables other than the default control tables must be configured with CLI commands, as described in “Configuring RMON Groups”.

Using RMON

RMON on the SSR allows you to analyze network traffic patterns, set up alarms to detect potential problems before they turn into real congestive situations, identify heavy network users to assess their possible candidacy for moves to dedicated or higher speed ports, and analyze traffic patterns to facilitate more long-term network planning.

RMON 1 provides layer 2 information. Traffic flowing through the SSR’s layer 2 ASIC is collected by RMON 1 groups. RMON 2 in the SSR provides layer 3 traffic information for IP and IPX protocols. Traffic flowing through the SSR’s layer 3 ASIC is collected by RMON 2 groups. The SSR’s RMON 2 protocol directory contains over 500 protocols that can be decoded for UDP and TCP ports. You can use RMON to see the kinds of protocol traffic being received on a given port.

For example, use the rmon show protocol-distributioncommand to see the kinds of traffic received on a given port:

ssr# rmon show protocol-distribution et.5.5 RMON II Protocol Distribution Table

Index: 506,	Port: et.1.7, Owner: monitor
Pkts	Octets	Protocol
----	------	--------
19	1586	ether2
19	1586	ether2.ip-v4
19	1586	*ether2.ip-v4

2192 *ether2.ip-v4.icmp

171394 *ether2.ip-v4.tcp

171394 *ether2.ip-v4.tcp.www-http

In the example output above, only HTTP and ICMP traffic is being received on this port. To find out which host or user is using these applications/protocols on this port, use the

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