Cisco ONS 15454 SDH Procedure Manual page 797

Chapter 21 DLPs D400 to D499
Table 21-2
Variable
etherStatsCollisionFrames
etherStatsDropEvents
etherStatsJabbers
etherStatsMulticastPkts
etherStatsUndersizePkts
etherStatsFragments
etherStatsPkts64Octets
etherStatsPkts65to127Octets
etherStatsPkts128to255Octets
etherStatsPkts256to511Octets
etherStatsPkts512to1023Octets
78-17194-01
Ethernet Threshold Variables (MIBs) (continued)
Definition
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.
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.
Total number of octets of data (including bad packets) received
on the network.
The total number of good packets received that were directed to
a multicast address. This number does not include packets
directed to the broadcast.
Number of packets received with a length less than 64 octets.
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.
Total number of packets received (including error packets) that
were 64 octets in length.
Total number of packets received (including error packets) that
were 65 to 172 octets in length.
Total number of packets received (including error packets) that
were 128 to 255 octets in length.
Total number of packets received (including error packets) that
were 256 to 511 octets in length.
Total number of packets received (including error packets) that
were 512 to 1023 octets in length.
DLP- D441 Create Ethernet RMON Alarm Thresholds
Cisco ONS 15454 SDH Procedure Guide, R7.0
21-31