Specifications

9031280 E4 Modeling RMON in SPECTRUM

2-5

Configuring RMON as a Network Monitor Point

When you work with RMON, you have the option of configuring an RMON

probe model as a network monitor point for the given segment or ring. A

monitor point is a device within a network group model (such as a LAN_802_3

or LAN_802_5 network) that provides the statistics that are used to calculate

network activity in the network group model’s Performance View. The specific

monitor point device is selected by SPECTRUM based on the value of its

Monitor Precedence attribute.

Within a network model, the device model having the highest Monitor

Precedence value becomes the monitor point for that network group. If more

than one device has the same Monitor Precedence value, the first device seen

is chosen. Typically, the highest precedence value belongs to network

analyzing devices, followed by successively less intelligent devices. You can

modify default precedence values by updating them in a network’s

Information View.

As described below, to use RMON as a monitor point in a network model, you

must first make a copy of an RMON probe and paste it into the network

model. When you copy a probe model into a network model, an instance of the

statistics group is automatically created on the device which the probe model

represents. This instance is owned by the monitor point and provides the

statistics for the monitor point feature. For more information about the

statistics group, refer to Appendix A.

For Ethernet devices an instance of the Ethernet Statistics is created, and for

Token Ring an instance of MAC Layer Statistics is created.

When the probe model is removed from the network model, the instances

created for the monitor point are deleted.

To make RMON a network monitor point, you must accomplish these tasks:

• Associate the probe model with a network interface

• Copy the probe model into the network model at that interface

• Select the probe model as the monitor point

The following sections describe these modeling tasks.