tcpEStatsPathPreCongSumCwnd
TCP-ESTATS-MIB ·
.1.3.6.1.2.1.156.1.1.4.1.23
Object
The sum of the values of the congestion window, in octets, captured each time a congestion signal is received. This MUST be updated each time tcpEStatsPerfCongSignals is incremented, such that the change in tcpEStatsPathPreCongSumCwnd divided by the change in tcpEStatsPerfCongSignals is the average window (over some interval) just prior to a congestion signal.
Context
- MIB
- TCP-ESTATS-MIB
- OID
.1.3.6.1.2.1.156.1.1.4.1.23- Type
- column
- Access
- readonly
- Status
- current
- Units
- octets
- Parent
- tcpEStatsPathEntry
- Table
- tcpEStatsPathTable
- Siblings
- 25
Values & Constraints
No enumerated values or constraints recorded.
Related Objects
Sibling Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| tcpEStatsPathRetranThresh The number of duplicate acknowledgments required to trigger
Fast Retransmit. Note that although this is constant in
traditional Reno TCP implementations, it is adaptive in
many n… | column | SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.1 |
| tcpEStatsPathSampleRTT The most recent raw round trip time measurement used in
calculation of the RTO. | column | milliseconds SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.11 |
| tcpEStatsPathRTTVar The round trip time variation used in calculation of the
RTO. See RTTVAR in [RFC2988]. | column | milliseconds SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.12 |
| tcpEStatsPathMaxRTT The maximum sampled round trip time. | column | milliseconds SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.13 |
| tcpEStatsPathMinRTT The minimum sampled round trip time. | column | milliseconds SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.14 |
| tcpEStatsPathSumRTT The sum of all sampled round trip times.
Note that the change in tcpEStatsPathSumRTT divided by the
change in tcpEStatsPathCountRTT is the mean RTT, uniformly
avera… | column | milliseconds RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.15 |
| tcpEStatsPathHCSumRTT The sum of all sampled round trip times, on all systems
that implement multiple concurrent RTT measurements.
Note that the change in tcpEStatsPathHCSumRTT divided b… | column | milliseconds HCNUM-TCZeroBasedCounter64 | .1.3.6.1.2.1.156.1.1.4.1.16 |
| tcpEStatsPathCountRTT The number of round trip time samples included in
tcpEStatsPathSumRTT and tcpEStatsPathHCSumRTT. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.17 |
| tcpEStatsPathMaxRTO The maximum value of the retransmit timer RTO. | column | milliseconds SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.18 |
| tcpEStatsPathMinRTO The minimum value of the retransmit timer RTO. | column | milliseconds SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.19 |
| tcpEStatsPathNonRecovDAEpisodes The number of duplicate acknowledgment episodes that did
not trigger a Fast Retransmit because ACK advanced prior to
the number of duplicate acknowledgments reaching
RetranThresh.… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.2 |
| tcpEStatsPathIpTtl The value of the TTL field carried in the most recently
received IP header. This is sometimes useful to detect
changing or unstable routes. | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.2.1.156.1.1.4.1.20 |
| tcpEStatsPathIpTosIn The value of the IPv4 Type of Service octet, or the IPv6
traffic class octet, carried in the most recently received
IP header.
This is useful to diagnose interactio… | column | OctetString | .1.3.6.1.2.1.156.1.1.4.1.21 |
| tcpEStatsPathIpTosOut The value of the IPv4 Type Of Service octet, or the IPv6
traffic class octet, carried in the most recently
transmitted IP header.
This is useful to diagnose interac… | column | OctetString | .1.3.6.1.2.1.156.1.1.4.1.22 |
| tcpEStatsPathPreCongSumRTT Sum of the last sample of the RTT (tcpEStatsPathSampleRTT)
prior to the received congestion signals. This MUST be
updated each time tcpEStatsPerfCongSignals is incremented,
such … | column | milliseconds RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.24 |
| tcpEStatsPathPostCongSumRTT Sum of the first sample of the RTT (tcpEStatsPathSampleRTT)
following each congestion signal. Such that the change in
tcpEStatsPathPostCongSumRTT divided by the change in
tcpESta… | column | octets RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.25 |
| tcpEStatsPathPostCongCountRTT The number of RTT samples included in
tcpEStatsPathPostCongSumRTT such that the change in
tcpEStatsPathPostCongSumRTT divided by the change in
tcpEStatsPathPostCongCountRTT is the… | column | milliseconds RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.26 |
| tcpEStatsPathECNsignals The number of congestion signals delivered to the TCP
sender via explicit congestion notification (ECN). This is
typically the number of segments bearing Echo Congestion
… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.27 |
| tcpEStatsPathDupAckEpisodes The number of Duplicate Acks Sent when prior Ack was not
duplicate. This is the number of times that a contiguous
series of duplicate acknowledgments have been sent.
… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.28 |
| tcpEStatsPathRcvRTT The receiver's estimate of the Path RTT.
Adaptive receiver window algorithms depend on the receiver
to having a good estimate of the path RTT. | column | SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.4.1.29 |
| tcpEStatsPathSumOctetsReordered The sum of the amounts SND.UNA advances on the
acknowledgment which ends a dup-ack episode without a
retransmission.
Note the change in tcpEStatsPathSumOctetsReorde… | column | octets RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.3 |
| tcpEStatsPathDupAcksOut The number of duplicate ACKs sent. The ratio of the change
in tcpEStatsPathDupAcksOut to the change in
tcpEStatsPathDupAckEpisodes is an indication of reorder or
recovery distanc… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.30 |
| tcpEStatsPathCERcvd The number of segments received with IP headers bearing
Congestion Experienced (CE) markings. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.31 |
| tcpEStatsPathECESent Number of times the Echo Congestion Experienced (ECE) bit
in the TCP header has been set (transitioned from 0 to 1),
due to a Congestion Experienced (CE) marking on an IP
header. … | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.32 |
| tcpEStatsPathNonRecovDA Duplicate acks (or SACKS) that did not trigger a Fast
Retransmit because ACK advanced prior to the number of
duplicate acknowledgments reaching RetranThresh.
In man… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.4.1.4 |