rEtherHistoryCollisions
SWITCH-RMON-MIB ·
.1.3.6.1.4.1.8886.6.1.22.2.2.1.14
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
- SWITCH-RMON-MIB
- OID
.1.3.6.1.4.1.8886.6.1.22.2.2.1.14- Type
- column
- Access
- readonly
- Status
- mandatory
- Parent
- rEtherHistoryEntry
- Table
- rEtherHistoryTable
- Siblings
- 14
Syntax
RFC1155-SMICounter
- Source
- RFC1155-SMICounter
- Base type
Unsigned32
Values & Constraints
Type Constraints
range: 0..4294967295
Related Objects
Sibling Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| rEtherHistoryIndex mandatory 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 | .1.3.6.1.4.1.8886.6.1.22.2.2.1.1 |
| rEtherHistoryUndersizePkts mandatory 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 | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.10 |
| rEtherHistoryOversizePkts mandatory 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 | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.11 |
| rEtherHistoryFragments mandatory 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… | column | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.12 |
| rEtherHistoryJabbers mandatory 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 | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.13 |
| rEtherHistoryUtilization mandatory The best estimate of the mean physical layer
network utilization on this interface during this
sampling interval, in hundredths of a percent. | column | Integer32 | .1.3.6.1.4.1.8886.6.1.22.2.2.1.15 |
| rEtherHistorySampleIndex mandatory 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 | .1.3.6.1.4.1.8886.6.1.22.2.2.1.2 |
| rEtherHistoryIntervalStart mandatory 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 | RFC1155-SMITimeTicks | .1.3.6.1.4.1.8886.6.1.22.2.2.1.3 |
| rEtherHistoryDropEvents mandatory 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 | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.4 |
| rEtherHistoryOctets mandatory The total number of octets of data (including
those in bad packets) received on the
network (excluding framing bits but including
FCS octets). | column | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.5 |
| rEtherHistoryPkts mandatory The number of packets (including bad packets)
received during this sampling interval. | column | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.6 |
| rEtherHistoryBroadcastPkts mandatory The number of good packets received during this
sampling interval that were directed to the
broadcast address. | column | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.7 |
| rEtherHistoryMulticastPkts mandatory 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 | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.8 |
| rEtherHistoryCRCAlignErrors mandatory 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 | RFC1155-SMICounter | .1.3.6.1.4.1.8886.6.1.22.2.2.1.9 |