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Chapter 21 DLPs D400 to D499
DLP- D441 Create Ethernet RMON Alarm Thresholds
etherStatsCollisionFrames
An estimate of the total number of collisions on this Ethernet
segment. The value returned depends on the location of the
RMON probe. Section 8.2.1.3 (10Base5) and Section 10.3.1.3
(10Base2) of IEEE 802.3 state that a station must detect a
collision in the receive mode, if three or more stations are
transmitting simultaneously. A repeater port must detect a
collision when two or more stations are transmitting
simultaneously. Thus, a probe placed on a repeater port could
record more collisions than a probe connected to a station on the
same segment.
Probe location plays a much smaller role when considering
10BaseT. Section 14.2.1.4 (10BaseT) of IEEE 802.3 defines a
collision as the simultaneous presence of signals on the DO and
RD circuits (transmitting and receiving at the same time). A
10BaseT station can only detect collisions when it is
transmitting. Thus, probes placed on a station and a repeater
should report the same number of collisions.
An RMON probe inside a repeater should report collisions
between the repeater and one or more other hosts (transmit
collisions as defined by IEEE 802.3k) plus receiver collisions
observed on any coax segments to which the repeater is
connected.
etherStatsDropEvents
The total number of events in which packets were dropped by the
probe due to lack of resources. This number is not necessarily the
number of packets dropped; it is just the number of times this
condition has been detected.
etherStatsJabbers
Total number of octets of data (including bad packets) received
on the network.
etherStatsMulticastPkts
The total number of good packets received that were directed to
a multicast address. This number does not include packets
directed to the broadcast.
etherStatsUndersizePkts
Number of packets received with a length less than 64 octets.
etherStatsFragments
Total number of packets that are not an integral number of octets
or have a bad FCS, and that are less than 64 octets long.
etherStatsPkts64Octets
Total number of packets received (including error packets) that
were 64 octets in length.
etherStatsPkts65to127Octets
Total number of packets received (including error packets) that
were 65 to 172 octets in length.
etherStatsPkts128to255Octets
Total number of packets received (including error packets) that
were 128 to 255 octets in length.
etherStatsPkts256to511Octets
Total number of packets received (including error packets) that
were 256 to 511 octets in length.
etherStatsPkts512to1023Octets
Total number of packets received (including error packets) that
were 512 to 1023 octets in length.
Table 21-2
Ethernet Threshold Variables (MIBs) (continued)
Variable
Definition
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