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IETF RFC 2012
SNMPv2 Management Information Base for the Transmission Control Protocol using SMIv2
Last modified on Tuesday, December 3rd, 1996
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Network Working Group K. McCloghrie, Editor
Request for Comments: 2012 Cisco Systems
Updates: 1213 November 1996
Category: Standards Track
SNMPv2 Management Information Base
for the Transmission Control Protocol using SMIv2
 Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
IESG Note:
The IP, UDP, and TCP MIB modules currently support only IPv4. These
three modules use the IpAddress type defined as an OCTET STRING of
length 4 to represent the IPv4 32-bit internet addresses. (See RFC
1902, SMI for SNMPv2.) They do not support the new 128-bit IPv6
internet addresses.
Table of Contents
1. Introduction ................................................ 1
2. Definitions ................................................. 2
2.1 The TCP Group .............................................. 3
2.2 Conformance Information .................................... 8
2.2.1 Compliance Statements .................................... 8
2.2.2 Units of Conformance ..................................... 9
3. Acknowledgements ............................................ 10
4. References .................................................. 10
5. Security Considerations ..................................... 10
6. Editor's Address ............................................ 10
1. Introduction
A management system contains: several (potentially many) nodes, each
with a processing entity, termed an agent, which has access to
management instrumentation; at least one management station; and, a
management protocol, used to convey management information between
the agents and management stations. Operations of the protocol are
carried out under an administrative framework which defines
authentication, authorization, access control, and privacy policies.
McCloghrie Standards Track PAGE 1 
RFC 2012 SNMPv2 MIB for TCP November 1996
Management stations execute management applications which monitor and
control managed elements. Managed elements are devices such as
hosts, routers, terminal servers, etc., which are monitored and
controlled via access to their management information.
Management information is viewed as a collection of managed objects,
residing in a virtual information store, termed the Management
Information Base (MIB). Collections of related objects are defined
in MIB modules. These modules are written using a subset of OSI's
Abstract Syntax Notation One (ASN.1) [1], termed the Structure of
Management Information (SMI) [2].
This document is the MIB module which defines managed objects for
managing implementations of the Transmission Control Protocol (TCP)
[3].
The managed objects in this MIB module were originally defined using
the SNMPv1 framework as a part of MIB-II [4]. This document defines
the same objects for TCP using the SNMPv2 framework.
2. Definitions
TCP-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, Gauge32,
Counter32, IpAddress, mib-2 FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF;
tcpMIB MODULE-IDENTITY
LAST-UPDATED "9411010000Z"
ORGANIZATION "IETF SNMPv2 Working Group"
CONTACT-INFO
" Keith McCloghrie
Postal: Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
US
Phone: +1 408 526 5260
Email: kzm@cisco.com"
McCloghrie Standards Track PAGE 2
RFC 2012 SNMPv2 MIB for TCP November 1996
DESCRIPTION
"The MIB module for managing TCP implementations."
REVISION "9103310000Z"
DESCRIPTION
"The initial revision of this MIB module was part of MIB-
II."
::= { mib-2 49 }
-- the TCP group
tcp OBJECT IDENTIFIER ::= { mib-2 6 }
tcpRtoAlgorithm OBJECT-TYPE
SYNTAX INTEGER {
other(1), -- none of the following
constant(2), -- a constant rto
rsre(3), -- MIL-STD-1778, Appendix B
vanj(4) -- Van Jacobson's algorithm [5]
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The algorithm used to determine the timeout value used for
retransmitting unacknowledged octets."
::= { tcp 1 }
tcpRtoMin OBJECT-TYPE
SYNTAX Integer32
UNITS "milliseconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The minimum value permitted by a TCP implementation for the
retransmission timeout, measured in milliseconds. More
refined semantics for objects of this type depend upon the
algorithm used to determine the retransmission timeout. In
particular, when the timeout algorithm is rsre(3), an object
of this type has the semantics of the LBOUND quantity
described in RFC 793."
::= { tcp 2 }
tcpRtoMax OBJECT-TYPE
SYNTAX Integer32
UNITS "milliseconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum value permitted by a TCP implementation for the
McCloghrie Standards Track PAGE 3
RFC 2012 SNMPv2 MIB for TCP November 1996
retransmission timeout, measured in milliseconds. More
refined semantics for objects of this type depend upon the
algorithm used to determine the retransmission timeout. In
particular, when the timeout algorithm is rsre(3), an object
of this type has the semantics of the UBOUND quantity
described in RFC 793."
::= { tcp 3 }
tcpMaxConn OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The limit on the total number of TCP connections the entity
can support. In entities where the maximum number of
connections is dynamic, this object should contain the value
-1."
::= { tcp 4 }
tcpActiveOpens OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the SYN-SENT state from the CLOSED state."
::= { tcp 5 }
tcpPassiveOpens OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the SYN-RCVD state from the LISTEN state."
::= { tcp 6 }
tcpAttemptFails OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the CLOSED state from either the SYN-SENT
state or the SYN-RCVD state, plus the number of times TCP
connections have made a direct transition to the LISTEN
state from the SYN-RCVD state."
::= { tcp 7 }
McCloghrie Standards Track PAGE 4
RFC 2012 SNMPv2 MIB for TCP November 1996
tcpEstabResets OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the CLOSED state from either the ESTABLISHED
state or the CLOSE-WAIT state."
::= { tcp 8 }
tcpCurrEstab OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of TCP connections for which the current state
is either ESTABLISHED or CLOSE- WAIT."
::= { tcp 9 }
tcpInSegs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments received, including those
received in error. This count includes segments received on
currently established connections."
::= { tcp 10 }
tcpOutSegs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments sent, including those on
current connections but excluding those containing only
retransmitted octets."
::= { tcp 11 }
tcpRetransSegs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments retransmitted - that is, the
number of TCP segments transmitted containing one or more
previously transmitted octets."
McCloghrie Standards Track PAGE 5
RFC 2012 SNMPv2 MIB for TCP November 1996
::= { tcp 12 }
-- the TCP Connection table
-- The TCP connection table contains information about this
-- entity's existing TCP connections.
tcpConnTable OBJECT-TYPE
SYNTAX SEQUENCE OF TcpConnEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing TCP connection-specific information."
::= { tcp 13 }
tcpConnEntry OBJECT-TYPE
SYNTAX TcpConnEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A conceptual row of the tcpConnTable containing information
about a particular current TCP connection. Each row of this
table is transient, in that it ceases to exist when (or soon
after) the connection makes the transition to the CLOSED
state."
INDEX { tcpConnLocalAddress,
tcpConnLocalPort,
tcpConnRemAddress,
tcpConnRemPort }
::= { tcpConnTable 1 }
TcpConnEntry ::= SEQUENCE {
tcpConnState INTEGER,
tcpConnLocalAddress IpAddress,
tcpConnLocalPort INTEGER,
tcpConnRemAddress IpAddress,
tcpConnRemPort INTEGER
}
tcpConnState OBJECT-TYPE
SYNTAX INTEGER {
closed(1),
listen(2),
synSent(3),
synReceived(4),
established(5),
finWait1(6),
McCloghrie Standards Track PAGE 6
RFC 2012 SNMPv2 MIB for TCP November 1996
finWait2(7),
closeWait(8),
lastAck(9),
closing(10),
timeWait(11),
deleteTCB(12)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The state of this TCP connection.
The only value which may be set by a management station is
deleteTCB(12). Accordingly, it is appropriate for an agent
to return a `badValue' response if a management station
attempts to set this object to any other value.
If a management station sets this object to the value
deleteTCB(12), then this has the effect of deleting the TCB
(as defined in RFC 793) of the corresponding connection on
the managed node, resulting in immediate termination of the
connection.
As an implementation-specific option, a RST segment may be
sent from the managed node to the other TCP endpoint (note
however that RST segments are not sent reliably)."
::= { tcpConnEntry 1 }
tcpConnLocalAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The local IP address for this TCP connection. In the case
of a connection in the listen state which is willing to
accept connections for any IP interface associated with the
node, the value 0.0.0.0 is used."
::= { tcpConnEntry 2 }
tcpConnLocalPort OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The local port number for this TCP connection."
::= { tcpConnEntry 3 }
tcpConnRemAddress OBJECT-TYPE
McCloghrie Standards Track PAGE 7
RFC 2012 SNMPv2 MIB for TCP November 1996
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The remote IP address for this TCP connection."
::= { tcpConnEntry 4 }
tcpConnRemPort OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The remote port number for this TCP connection."
::= { tcpConnEntry 5 }
tcpInErrs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments received in error (e.g., bad
TCP checksums)."
::= { tcp 14 }
tcpOutRsts OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of TCP segments sent containing the RST flag."
::= { tcp 15 }
-- conformance information
tcpMIBConformance OBJECT IDENTIFIER ::= { tcpMIB 2 }
tcpMIBCompliances OBJECT IDENTIFIER ::= { tcpMIBConformance 1 }
tcpMIBGroups OBJECT IDENTIFIER ::= { tcpMIBConformance 2 }
-- compliance statements
tcpMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for SNMPv2 entities which
implement TCP."
MODULE -- this module
McCloghrie Standards Track PAGE 8
RFC 2012 SNMPv2 MIB for TCP November 1996
MANDATORY-GROUPS { tcpGroup
}
::= { tcpMIBCompliances 1 }
-- units of conformance
tcpGroup OBJECT-GROUP
OBJECTS { tcpRtoAlgorithm, tcpRtoMin, tcpRtoMax,
tcpMaxConn, tcpActiveOpens,
tcpPassiveOpens, tcpAttemptFails,
tcpEstabResets, tcpCurrEstab, tcpInSegs,
tcpOutSegs, tcpRetransSegs, tcpConnState,
tcpConnLocalAddress, tcpConnLocalPort,
tcpConnRemAddress, tcpConnRemPort,
tcpInErrs, tcpOutRsts }
STATUS current
DESCRIPTION
"The tcp group of objects providing for management of TCP
entities."
::= { tcpMIBGroups 1 }
END
McCloghrie Standards Track PAGE 9
RFC 2012 SNMPv2 MIB for TCP November 1996
3. Acknowledgements
This document contains a modified subset of RFC 1213.
4. References
[1] Information processing systems - Open Systems Interconnection -
Specification of Abstract Syntax Notation One (ASN.1),
International Organization for Standardization. International
Standard 8824, (December, 1987).
[2] McCloghrie, K., Editor, "Structure of Management Information
for version 2 of the Simple Network Management Protocol
(SNMPv2)", RFC 1902, Cisco Systems, January 1996.
[3] Postel, J., "Transmission Control Protocol - DARPA Internet
Program Protocol Specification", STD 7, RFC 793, DARPA,
September 1981.
[4] McCloghrie, K., and M. Rose, "Management Information Base for
Network Management of TCP/IP-based internets: MIB-II", STD 17,
RFC 1213, March 1991.
[5] Jacobson, V., "Congestion Avoidance and Control", SIGCOMM 1988,
Stanford, California.
5. Security Considerations
Security issues are not discussed in this memo.
6. Editor's Address
Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
US
Phone: +1 408 526 5260
EMail: kzm@cisco.com
McCloghrie Standards Track PAGE 10
SNMPv2 Management Information Base for the Transmission Control Protocol using SMIv2
RFC TOTAL SIZE: 16818 bytes
PUBLICATION DATE: Tuesday, December 3rd, 1996
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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