rfc1066.txt
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Network Working Group K. McCloghrie
Request For Comments: 1066 M. Rose
TWG
August 1988
Management Information Base for Network Management
of TCP/IP-based internets
Table of Contents
1. Status of this Memo ................................... 1
2. IAB POLICY STATEMENT .................................. 2
3. Introduction .......................................... 2
4. Objects ............................................... 5
4.1 Object Groups ........................................ 5
4.2 Format of Definitions ................................ 6
5. Object Definitions .................................... 7
5.1 The System Group ..................................... 8
5.2 The Interfaces Group ................................. 10
5.2.1 The Interfaces Table ............................... 10
5.3 The Address Translation Group ........................ 22
5.4 The IP Group ......................................... 25
5.4.1 The IP Address Table ............................... 33
5.4.2 The IP Routing Table ............................... 35
5.5 The ICMP Group ....................................... 42
5.6 The TCP Group ........................................ 52
5.7 The UDP Group ........................................ 61
5.8 The EGP Group ........................................ 63
5.8.1 The EGP Neighbor Table ............................. 64
6. Definitions ........................................... 67
7. Acknowledgements ...................................... 88
8. References ............................................ 89
1. Status of this Memo
This memo provides the initial version of the Management Information
Base (MIB) for use with network management protocols in TCP/IP-based
internets in the short-term. In particular, together with its
companion memos which describe the structure of management
information along with the initial network management protocol, these
documents provide a simple, workable architecture and system for
managing TCP/IP-based internets and in particular the Internet.
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RFC 1066 MIB August 1988
This memo specifies a draft standard for the Internet community.
TCP/IP implementations in the Internet which are network manageable
are expected to adopt and implement this specification.
Distribution of this memo is unlimited.
2. IAB POLICY STATEMENT
This MIB specification is the first edition of an evolving document
defining variables needed for monitoring and control of various
components of the Internet. Not all groups of defined variables are
mandatory for all Internet components.
For example, the EGP group is mandatory for gateways using EGP but
not for hosts which should not be running EGP. Similarly, the TCP
group is mandatory for hosts running TCP but not for gateways which
aren't running it. What IS mandatory, however, is that all variables
of a group be supported if any element of the group is supported.
It is expected that additional MIB groups and variables will be
defined over time to accommodate the monitoring and control needs of
new or changing components of the Internet. The MIB working group
will continue to refine this specification and projects a revision
incorporating new requirements in early 1989.
3. Introduction
As reported in RFC 1052, IAB Recommendations for the Development of
Internet Network Management Standards [1], the Internet Activities
Board has directed the Internet Engineering Task Force (IETF) to
create two new working groups in the area of network management. One
group is charged with the further specification and definition of
elements to be included in the Management Information Base. The
other is charged with defining the modifications to the Simple
Network Management Protocol (SNMP) to accommodate the short-term
needs of the network vendor and operator communities. The long-term
needs of the Internet community are to be met using the ISO CMIS/CMIP
[2,3] framework as a basis. An existing IETF working group, the
"NETMAN" group, is already engaged in defining the use of CMIS/CMIP
in a TCP/IP network, and will continue with responsibility for
addressing the longer-term requirements.
The output of the MIB working group is to be provided to both the
SNMP working group and the NETMAN group, so as to ensure
compatibility of monitored items for both network management
frameworks.
The MIB working group has produced this memo and a companion. The
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companion memo [4] defines a Structure for Management Information
(SMI) for use by the managed objects contained in the MIB. This memo
defines the list of managed objects.
The IAB also urged the working groups to be "extremely sensitive to
the need to keep SNMP simple," and recommends that the MIB working
group take as its starting inputs the MIB definitions found in the
High-Level Entity Management Systems (HEMS) RFC 1024 [5], the initial
SNMP specification [6], and the CMIS/CMIP memos [7,8].
Thus, the list of managed objects defined here, has been derived by
taking only those elements which are considered essential. Since
such elements are essential, there is no need to allow the
implementation of individual objects, to be optional. Rather, all
compliant implementations will contain all applicable (see below)
objects defined in this memo.
This approach of taking only the essential objects is NOT
restrictive, since the SMI defined in the companion memo provides
three extensibility mechanisms: one, the addition of new standard
objects through the definitions of new versions of the MIB; two, the
addition of widely-available but non-standard objects through the
multilateral subtree; and three, the addition of private objects
through the enterprises subtree. Such additional objects can not only
be used for vendor-specific elements, but also for experimentation as
required to further the knowledge of which other objects are
essential.
The primary criterion for being considered essential was for an
object to be contained in all of the above referenced MIB
definitions. A few other objects have been included, but only if the
MIB working group believed they are truly essential. The detailed
list of criteria against which potential inclusions in this (initial)
MIB were considered, was:
1) An object needed to be essential for either fault or
configuration management.
2) Only weak control objects were permitted (by weak, it
is meant that tampering with them can do only limited
damage). This criterion reflects the fact that the
current management protocols are not sufficiently secure
to do more powerful control operations.
3) Evidence of current use and utility was required.
4) An attempt was made to limit the number of objects to
about 100 to make it easier for vendors to fully
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instrument their software.
5) To avoid redundant variables, it was required that no
object be included that can be derived from others in the
MIB.
6) Implementation specific objects (e.g., for BSD UNIX)
were excluded.
7) It was agreed to avoid heavily instrumenting critical
sections of code. The general guideline was one counter
per critical section per layer.
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4. Objects
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Objects in the MIB are
defined using Abstract Syntax Notation One (ASN.1) [9].
The mechanisms used for describing these objects are specified in the
companion memo. In particular, each object has a name, a syntax, and
an encoding. The name is an object identifier, an administratively
assigned name, which specifies an object type. The object type
together with an object instance serves to uniquely identify a
specific instantiation of the object. For human convenience, we
often use a textual string, termed the OBJECT DESCRIPTOR, to also
refer to the object type.
The syntax of an object type defines the abstract data structure
corresponding to that object type. The ASN.1 language is used for
this purpose. However, the companion memo purposely restricts the
ASN.1 constructs which may be used. These restrictions are
explicitly made for simplicity.
The encoding of an object type is simply how that object type is
represented using the object type's syntax. Implicitly tied to the
notion of an object type's syntax and encoding is how the object type
is represented when being transmitted on the network. This memo
specifies the use of the basic encoding rules of ASN.1 [10].
4.1. Object Groups
Since this list of managed objects contains only the essential
elements, there is no need to allow individual objects to be
optional. Rather, the objects are arranged into the following
groups:
- System
- Interfaces
- Address Translation
- IP
- ICMP
- TCP
- UDP
- EGP
There are two reasons for defining these groups: one, to provide a
means of assigning object identifiers; two, to provide a method for
implementations of managed agents to know which objects they must
implement. This method is as follows: if the semantics of a group is
applicable to an implementation, then it must implement all objects
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in that group. For example, an implementation must implement the EGP
group if and only if it implements the EGP protocol.
4.2. Format of Definitions
The next section contains the specification of all object types
contained in the MIB. Following the conventions of the companion
memo, the object types are defined using the following fields:
OBJECT:
-------
A textual name, termed the OBJECT DESCRIPTOR, for the
object type, along with its corresponding OBJECT
IDENTIFIER.
Syntax:
The abstract syntax for the object type, presented using
ASN.1. This must resolve to an instance of the ASN.1
type ObjectSyntax defined in the SMI.
Definition:
A textual description of the semantics of the object
type. Implementations should ensure that their
interpretation of the object type fulfills this
definition since this MIB is intended for use in multi-
vendor environments. As such it is vital that object
types have consistent meaning across all machines.
Access:
One of read-only, read-write, write-only, or
not-accessible.
Status:
One of mandatory, optional, or obsolete.
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5. Object Definitions
RFC1066-MIB { iso org(3) dod(6) internet(1) mgmt(2) 1 }
DEFINITIONS ::= BEGIN
IMPORTS
mgmt, OBJECT-TYPE, NetworkAddress, IpAddress,
Counter, Gauge, TimeTicks
FROM RFC1065-SMI;
mib OBJECT IDENTIFIER ::= { mgmt 1 }
system OBJECT IDENTIFIER ::= { mib 1 }
interfaces OBJECT IDENTIFIER ::= { mib 2 }
at OBJECT IDENTIFIER ::= { mib 3 }
ip OBJECT IDENTIFIER ::= { mib 4 }
icmp OBJECT IDENTIFIER ::= { mib 5 }
tcp OBJECT IDENTIFIER ::= { mib 6 }
udp OBJECT IDENTIFIER ::= { mib 7 }
egp OBJECT IDENTIFIER ::= { mib 8 }
END
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5.1. The System Group
Implementation of the System group is mandatory for all
systems.
OBJECT:
-------
sysDescr { system 1 }
Syntax:
OCTET STRING
Definition:
A textual description of the entity. This value should
include the full name and version identification of the
system's hardware type, software operating-system, and
networking software. It is mandatory that this only
contain printable ASCII characters.
Access:
read-only.
Status:
mandatory.
OBJECT:
-------
sysObjectID { system 2 }
Syntax:
OBJECT IDENTIFIER
Definition:
The vendor's authoritative identification of the network
management subsystem contained in the entity. This value
is allocated within the SMI enterprises subtree
(1.3.6.1.4.1) and provides an easy and unambiguous means
for determining "what kind of box" is being managed. For
example, if vendor "Flintstones, Inc." was assigned the
subtree 1.3.6.1.4.1.42, it could assign the identifier
1.3.6.1.4.1.42.1.1 to its "Fred Router".
Access:
read-only.
Status:
mandatory.
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OBJECT:
-------
sysUpTime { system 3 }
Syntax:
TimeTicks
Definition:
The time (in hundredths of a second) since the network
management portion of the system was last re-initialized.
Access:
read-only.
Status:
mandatory.
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5.2. The Interfaces Group
Implementation of the Interfaces group is mandatory for all
systems.
OBJECT:
-------
ifNumber { interfaces 1 }
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