# RMON Ethernet Statistics - Part I

To access this dialog box:

1. Select Device > Monitor > RMON.
2. Select an entry and click Monitor.

From this dialog box, you can monitor the Remote Network Monitoring (RMON) Ethernet statistics for this device.

To view the definition for a particular MIB variable, click the appropriate link from the following list:

- Octets (etherStatsOctets)

- Packets (etherStatsPkts)

- Utilisation (Utilization)

- Broadcasts (etherStatsBroadcastPkts)

- Multicasts (etherStatsMulticastPkts)

- CRC Errors (etherStatsCRCAlignErrors)

- Runts (etherStatsUndersizePkts)

- Giants (etherStatsOversizePkts)

- Fragments (etherStatsFragments)

The following list specifies buttons in this dialog box, as well as their function:

- To specify the refresh rate for this dialog box, select a value from the drop-down box.

- Click Start/Stop to begin/end device monitoring.

> Note: The Start/Stop toggle feature is supported by CiscoView 5.3 and later.

- Click Cancel to close the dialog box.

- Click Print to print the contents of the dialog box.

- Click Help to access online help.

Octets (etherStatsOctets)

Total number of octets of data (including those in bad packets) received on the network (excluding framing bits but including FCS octets).

Packets (etherStatsPkts)

Total number of packets (including bad packets, broadcast packets, and multicast packets) received.

Utilisation (Utilization)

The etherStatsPkts and etherStatsOctets objects should be sampled before and after a common interval. In the equation below, the differences in the sampled values are Pkts and Octets, respectively, and the number of seconds in the interval is Interval. These values are used to calculate Utilization as follows:

| Pkts * (9.6 + 6.4) + (Octets * .8)
Utilization = | -------------------------------------
| Interval * 10,000

The result is the utilization percentage of the ethernet segment.

Broadcasts (etherStatsBroadcastPkts)

Total number of good packets received that were directed to the broadcast address. Note that this does not include multicast packets.

Multicasts (etherStatsMulticastPkts)

Total number of good packets received that were directed to a multicast address. Note that this number does not include packets directed to the broadcast address.

CRC Errors (etherStatsCRCAlignErrors)

Total number of packets received that had a length (excluding framing bits, but including FCS octets) of between 64 and 1518 octets, inclusive, but had either a bad Frame Check Sequence (FCS) with an integral number of octets (FCS Error) or a bad FCS with a non-integral number of octets (Alignment Error).

Runts (etherStatsUndersizePkts)

Total number of packets received that were less than 64 octets in length (excluding framing bits, but including FCS octets) and were otherwise well formed.

Giants (etherStatsOversizePkts)

Total number of packets received that were longer than 1518 octets.

Fragments (etherStatsFragments)

Total number of packets received that were less than 64 octets in length and had either a bad Frame Check Sequence (FCS) with an integral number of octets (FCS Error) or a bad FCS with a non-integral number of octets (Alignment Error).