# Viewing RMON history statistics using EDM

Use the following procedure to display Rmon History statistics.

## Prerequisites

- Open one of the supported browsers.

- Enter the IP address of the switch to open an EDM session.

## Procedure steps

1. From the navigation tree, double-click Serviceability.

2. In the Serviceability tree, double-click RMON.

3. In the RMON tree, double-click Control.

4. In the work area, select a port.

5. In the toolbar, click Display History Data.

   The Rmon History window appears for the selected port.

## Variable definitions

The following table describes the fields of Rmon History screen.

Field | Description
--- | ---
SampleIndex | Indicates the sample number. As history samples are taken, they are assigned greater sample numbers.
Utilization | Estimates the percentage of a link's capacity that was used during the sampling interval.
Octets | Indicates the number of octets received on the link during the sampling period.
Pkts | Indicates the number of packets received on the link during the sampling period.
BroadcastPkts | Indicates the number of packets received on the link during the sampling interval that were destined for the broadcast address.
MulticastPkts | Indicates the number of packets received on the link during the sampling interval that are destined for the multicast address. This does not include the broadcast packets.
DropEvents | Indicates the number of received packets that were dropped because of system resource constraints.
CRCAlignErrors | Indicates the number of packets received during a sampling interval that were between 64 and 1518 octets long. This length included Frame Check Sequence (FCS) octets but not framing bits. The packets had a bad FCS with either an integral number of octets (FCS Error), or a non-integral number of octets (Alignment Error).
UndersizePkts | Indicates the number of packets received during the sampling interval were less than 64 octets long (including FCS octets, but not framing bits.
OversizePkts | Indicates the number of packets received during the sampling interval were longer than 1518 octets (including FCS octets, but not framing bits, and were otherwise well formed.
Fragments | Indicates the number of packets received during the sampling interval were less than 64 octets long (including FCS octets, but not framing bits. The packets had a bad FCS with either an integral number of octects (FCS Error), or a non-integral number of octets (Alignment Error).
Collisions | Indicates the best estimate of the number of collisions on an Ethernet segment during a sampling interval.