Viewing statistics

The DM gathers Ethernet statistics that can be graphed in a variety of formats or saved to a file that can be exported to an outside presentation or graphing application.

To view RMON ethernet statistics:

Procedure Steps


Step Action

1

Select a port.

2

Do one of the following:


Step Action

1

From the shortcut menu, choose Graph.

2

Select Graph, Port from the menu.

3

On the toolbar, click the Graph button.


--End--

4

The Graph Port window appears. Click the RMON tab.


--End--

Job Aid

The following table describes the fields on the RMON tab.

Field Descriptions
Octets The total number of octets of data (including those in bad packets) received on the network (excluding framing bits but including FCS octets). You can use this object as a reasonable estimate of Ethernet utilization. For greater precision, sample the etherStatsPkts and etherStatsOctets objects before and after a common interval.
Pkts The total number of packets (including bad packets, broadcast packets, and multicast packets) received.
BroadcastPkts The total number of good packets received that were directed to the broadcast address. This does not include multicast packets.
MulticastPkts The total number of good packets received that were directed to a multicast address. This number does not include packets directed to the broadcast address.
CRCAlignErrors The 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 nonintegral number of octets (Alignment Error).
UndersizePkts The total number of packets received that were less than 64 octets long (excluding framing bits but including FCS octets) and were otherwise well formed.
OversizePkts The total number of packets received that were longer than 1518 octets (excluding framing bits but including FCS octets) and were otherwise well formed.
Fragments The total number of packets received that were less than 64 octets in length (excluding framing bits but including FCS octets) and had either a bad Frame Check Sequence (FCS) with an integral number of octets (FCS Error) or a bad FCS with a nonintegral number of octets (Alignment Error). Normal behavior for etherStatsFragments is to increment because it counts both runts (which are normal occurrences due to collisions) and noise hits.
Collisions The best estimate of the total number of collisions on this Ethernet segment.
Jabbers The total number of packets received that were longer than 1518 octets (excluding framing bits, but including FCS octets), 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). Jabber is defined as the condition where a packet exceeds 20 ms. The allowed range to detect jabber is between 20 ms and 150 ms.
1..64 The total number of packets (including bad packets) that were transmitted and received on this port between 1 and 64 octets in length (excluding framing bits but including FCS octets).
65..127 The total number of packets (including bad packets) that were transmitted and received on this port between 65 and 127 octets in length (excluding framing bits but including FCS octets).
128..255 The total number of packets (including bad packets) that were transmitted and received on this port between 128 and 255 octets in length (excluding framing bits but including FCS octets).
256..511 The total number of packets (including bad packets) that were transmitted and received on this port between 256 and 511 octets in length (excluding framing bits but including FCS octets).
512..1023 The total number of packets (including bad packets) that were transmitted and received on this port between 512 and 1023 octets in length (excluding framing bits but including FCS octets).
1024..1518 The total number of packets (including bad packets) that were transmitted and received on this port between 1024 and 1518 octets in length (excluding framing bits but including FCS octets).
Statistic Description
Poll Interval Statistics are updated based on the poll interval.
Default: 10s
Range: None, 2s, 5s, 10s, 30s, 1m, 5m, 30m 1h
Absolute The total count since the last time counters were reset. A system reboot resets all counters.
Cumulative The total count since the statistics tab was first opened. The elapsed time for the cumulative counter is shown at the bottom of the graph window.
Average/sec The cumulative count divided by the cumulative elapsed time.
Min/sec The minimum average for the counter for a polling interval over the cumulative elapsed time.
Max/sec The maximum average for the counter for a polling interval over the cumulative elapsed time.
Last/sec The average for the counter over the last polling interval.