etherHistoryCollisions
RMON-MIB ·
.1.3.6.1.2.1.16.2.2.1.14
Object
The best estimate of the total number of collisions
on this Ethernet segment during this sampling
interval.
The value returned will depend on the location of the
RMON probe. Section 8.2.1.3 (10BASE-5) and section
10.3.1.3 (10BASE-2) of IEEE standard 802.3 states 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
would.
Probe location plays a much smaller role when considering
10BASE-T. 14.2.1.4 (10BASE-T) of IEEE standard 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 10BASE-T 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.
Note also that an RMON probe inside a repeater should
ideally 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.
Context
- MIB
- RMON-MIB
- OID
.1.3.6.1.2.1.16.2.2.1.14- Type
- column
- Access
- readonly
- Status
- current
- Units
- Collisions
- Parent
- etherHistoryEntry
- Table
- etherHistoryTable
- Siblings
- 14
Syntax
Collisions SNMPv2-SMICounter32
- Source
- SNMPv2-SMICounter32
- Base type
Unsigned32
Values & Constraints
Type Constraints
range: 0..4294967295
Related Objects
Sibling Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| etherHistoryIndex The history of which this entry is a part. The
history identified by a particular value of this
index is the same history as identified
by the same value of historyControlIndex. | column | Integer32 | .1.3.6.1.2.1.16.2.2.1.1 |
| etherHistoryUndersizePkts 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. | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.10 |
| etherHistoryOversizePkts 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. | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.11 |
| etherHistoryFragments 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 eit… | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.12 |
| etherHistoryJabbers 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… | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.13 |
| etherHistoryUtilization The best estimate of the mean physical layer
network utilization on this interface during this
sampling interval, in hundredths of a percent. | column | Integer32 | .1.3.6.1.2.1.16.2.2.1.15 |
| etherHistorySampleIndex An index that uniquely identifies the particular
sample this entry represents among all samples
associated with the same historyControlEntry.
This index starts at 1 and increases … | column | Integer32 | .1.3.6.1.2.1.16.2.2.1.2 |
| etherHistoryIntervalStart The value of sysUpTime at the start of the interval
over which this sample was measured. If the probe
keeps track of the time of day, it should start
the first sample of the hist… | column | SNMPv2-SMITimeTicks | .1.3.6.1.2.1.16.2.2.1.3 |
| etherHistoryDropEvents The total number of events in which packets
were dropped by the probe due to lack of resources
during this sampling interval. Note that this number
is not necessarily the number … | column | SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.4 |
| etherHistoryOctets The total number of octets of data (including
those in bad packets) received on the
network (excluding framing bits but including
FCS octets). | column | Octets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.5 |
| etherHistoryPkts The number of packets (including bad packets)
received during this sampling interval. | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.6 |
| etherHistoryBroadcastPkts The number of good packets received during this
sampling interval that were directed to the
broadcast address. | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.7 |
| etherHistoryMulticastPkts The number of good packets received during this
sampling interval that were directed to a
multicast address. Note that this number does not
include packets addressed to the broad… | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.8 |
| etherHistoryCRCAlignErrors 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 eit… | column | Packets SNMPv2-SMICounter32 | .1.3.6.1.2.1.16.2.2.1.9 |