tcpEStatsStackWillUseSACK
TCP-ESTATS-MIB ·
.1.3.6.1.2.1.156.1.1.5.1.9
Object
column
TcpEStatsNegotiated
Enabled(1) if the local host will process SACK options,
selfDisabled(2) if SACK is disabled or not implemented on
the local host, or peerDisabled(3) if the remote host sends
duplicate ACKs without SACK options, or the local host
otherwise decides not to process received SACK options.
Unlike other TCP options, the remote data receiver cannot
explicitly indicate if it is able to generate SACK options.
When sending data, the local host has to deduce if the
remote receiver is sending SACK options. This object can
transition from Enabled(1) to peerDisabled(3) after the SYN
exchange.
Note that SACK negotiation is not symmetrical. SACK can
enabled on one side of the connection and not the other.
Context
- MIB
- TCP-ESTATS-MIB
- OID
.1.3.6.1.2.1.156.1.1.5.1.9- Type
- column
- Access
- readonly
- Status
- current
- Parent
- tcpEStatsStackEntry
- Table
- tcpEStatsStackTable
- Siblings
- 40
Syntax
TcpEStatsNegotiated
- Source
- TcpEStatsNegotiated
- Base type
Enumeration
Values & Constraints
Type Values
1 | enabled |
2 | selfDisabled |
3 | peerDisabled |
Related Objects
Sibling Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| tcpEStatsStackActiveOpen True(1) if the local connection traversed the SYN-SENT
state, else false(2). | column | SNMPv2-TCTruthValue | .1.3.6.1.2.1.156.1.1.5.1.1 |
| tcpEStatsStackState An integer value representing the connection state from the
TCP State Transition Diagram.
The value listen(2) is included only for parallelism to the
old tcpConnTab… | column | Enumeration | .1.3.6.1.2.1.156.1.1.5.1.10 |
| tcpEStatsStackNagle True(1) if the Nagle algorithm is being used, else
false(2). | column | SNMPv2-TCTruthValue | .1.3.6.1.2.1.156.1.1.5.1.11 |
| tcpEStatsStackMaxSsCwnd The maximum congestion window used during Slow Start, in
octets. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.12 |
| tcpEStatsStackMaxCaCwnd The maximum congestion window used during Congestion
Avoidance, in octets. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.13 |
| tcpEStatsStackMaxSsthresh The maximum slow start threshold, excluding the initial
value. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.14 |
| tcpEStatsStackMinSsthresh The minimum slow start threshold. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.15 |
| tcpEStatsStackInRecovery An integer value representing the state of the loss
recovery for this connection.
tcpESDataContiguous(1) indicates that the remote receiver
is reporting contiguous … | column | Enumeration | .1.3.6.1.2.1.156.1.1.5.1.16 |
| tcpEStatsStackDupAcksIn The number of duplicate ACKs received. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.17 |
| tcpEStatsStackSpuriousFrDetected The number of acknowledgments reporting out-of-order
segments after the Fast Retransmit algorithm has already
retransmitted the segments. (For example as detected by the
Eifel alg… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.18 |
| tcpEStatsStackSpuriousRtoDetected The number of acknowledgments reporting segments that have
already been retransmitted due to a Retransmission Timeout. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.19 |
| tcpEStatsStackMSSSent The value sent in an MSS option, or zero if none. | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.2.1.156.1.1.5.1.2 |
| tcpEStatsStackSoftErrors The number of segments that fail various consistency tests
during TCP input processing. Soft errors might cause the
segment to be discarded but some do not. Some of these soft
e… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.21 |
| tcpEStatsStackSoftErrorReason This object identifies which consistency test most recently
failed during TCP input processing. This object SHOULD be
set every time tcpEStatsStackSoftErrors is incremented. The… | column | Enumeration | .1.3.6.1.2.1.156.1.1.5.1.22 |
| tcpEStatsStackSlowStart The number of times the congestion window has been
increased by the Slow Start algorithm. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.23 |
| tcpEStatsStackCongAvoid The number of times the congestion window has been
increased by the Congestion Avoidance algorithm. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.24 |
| tcpEStatsStackOtherReductions The number of congestion window reductions made as a result
of anything other than AIMD congestion control algorithms.
Examples of non-multiplicative window reductions include
Con… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.25 |
| tcpEStatsStackCongOverCount The number of congestion events that were 'backed out' of
the congestion control state machine such that the
congestion window was restored to a prior value. This can
happen due … | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.26 |
| tcpEStatsStackFastRetran The number of invocations of the Fast Retransmit algorithm. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.27 |
| tcpEStatsStackSubsequentTimeouts The number of times the retransmit timeout has expired after
the RTO has been doubled. See Section 5.5 of RFC 2988. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.28 |
| tcpEStatsStackCurTimeoutCount The current number of times the retransmit timeout has
expired without receiving an acknowledgment for new data.
tcpEStatsStackCurTimeoutCount is reset to zero when new
data is ac… | column | SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.29 |
| tcpEStatsStackMSSRcvd The value received in an MSS option, or zero if none. | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.2.1.156.1.1.5.1.3 |
| tcpEStatsStackAbruptTimeouts The number of timeouts that occurred without any
immediately preceding duplicate acknowledgments or other
indications of congestion. Abrupt Timeouts indicate that
the path lost a… | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.30 |
| tcpEStatsStackSACKsRcvd The number of SACK options received. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.31 |
| tcpEStatsStackSACKBlocksRcvd The number of SACK blocks received (within SACK options). | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.32 |
| tcpEStatsStackSendStall The number of interface stalls or other sender local
resource limitations that are treated as congestion
signals. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.33 |
| tcpEStatsStackDSACKDups The number of duplicate segments reported to the local host
by D-SACK blocks. | column | RMON2-MIBZeroBasedCounter32 | .1.3.6.1.2.1.156.1.1.5.1.34 |
| tcpEStatsStackMaxMSS The maximum MSS, in octets. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.35 |
| tcpEStatsStackMinMSS The minimum MSS, in octets. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.36 |
| tcpEStatsStackSndInitial Initial send sequence number. Note that by definition
tcpEStatsStackSndInitial never changes for a given
connection. | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.2.1.156.1.1.5.1.37 |
| tcpEStatsStackRecInitial Initial receive sequence number. Note that by definition
tcpEStatsStackRecInitial never changes for a given
connection. | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.2.1.156.1.1.5.1.38 |
| tcpEStatsStackCurRetxQueue The current number of octets of data occupying the
retransmit queue. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.39 |
| tcpEStatsStackWinScaleSent The value of the transmitted window scale option if one was
sent; otherwise, a value of -1.
Note that if both tcpEStatsStackWinScaleSent and
tcpEStatsStackWinScaleR… | column | Integer32 | .1.3.6.1.2.1.156.1.1.5.1.4 |
| tcpEStatsStackMaxRetxQueue The maximum number of octets of data occupying the
retransmit queue. | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.40 |
| tcpEStatsStackCurReasmQueue The current number of octets of sequence space spanned by
the reassembly queue. This is generally the difference
between rcv.nxt and the sequence number of the right most
edge of… | column | octets SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.41 |
| tcpEStatsStackMaxReasmQueue The maximum value of tcpEStatsStackCurReasmQueue | column | SNMPv2-SMIGauge32 | .1.3.6.1.2.1.156.1.1.5.1.42 |
| tcpEStatsStackWinScaleRcvd The value of the received window scale option if one was
received; otherwise, a value of -1.
Note that if both tcpEStatsStackWinScaleSent and
tcpEStatsStackWinScale… | column | Integer32 | .1.3.6.1.2.1.156.1.1.5.1.5 |
| tcpEStatsStackTimeStamps Enabled(1) if TCP timestamps have been negotiated on,
selfDisabled(2) if they are disabled or not implemented on
the local host, or peerDisabled(3) if not negotiated by the
remote… | column | TcpEStatsNegotiated | .1.3.6.1.2.1.156.1.1.5.1.6 |
| tcpEStatsStackECN Enabled(1) if Explicit Congestion Notification (ECN) has
been negotiated on, selfDisabled(2) if it is disabled or
not implemented on the local host, or peerDisabled(3) if
not nego… | column | TcpEStatsNegotiated | .1.3.6.1.2.1.156.1.1.5.1.7 |
| tcpEStatsStackWillSendSACK Enabled(1) if the local host will send SACK options,
selfDisabled(2) if SACK is disabled or not implemented on
the local host, or peerDisabled(3) if the remote host did
not send t… | column | TcpEStatsNegotiated | .1.3.6.1.2.1.156.1.1.5.1.8 |