Reference Guide

RMON Commands 271
rmon alarm
The rmon alarm Global Configuration mode command configures alarm conditions. To remove
an alarm, use the no form of this command.
Multicast The number of good packets received during this sampling interval that were directed
to a multicast address. This number does not include packets addressed to the
broadcast address.
Util The best estimate of the mean physical layer network utilization on this interface
during this sampling interval, in hundredths of a percent.
CRC Align The number of packets received during this sampling interval that had a length
(excluding framing bits but including FCS octets) 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).
Undersize The number of packets received during this sampling interval that were less than 64
octets long (excluding framing bits but including FCS octets) and were otherwise well
formed.
Oversize The number of packets received during this sampling interval that were longer than
1518 octets (excluding framing bits but including FCS octets) but were otherwise well
formed.
Fragments The total number of packets received during this sampling interval that were less than
64 octets in length (excluding framing bits but including FCS octets) 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 (AlignmentError). It is normal for
etherHistoryFragments to increment because it counts both runts (which are normal
occurrences due to collisions) and noise hits.
Jabbers The number of packets received during this sampling interval 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).
Dropped The total number of events in which packets were dropped by the probe due to lack of
resources during this sampling interval. This number is not necessarily the number of
packets dropped, it is just the number of times this condition has been detected.
Collisions The best estimate of the total number of collisions on this Ethernet segment during
this sampling interval.