📄 rfc1284.txt
字号:
Network Working Group J. Cook, Editor
Request for Comments: 1284 Chipcom Corporation
December 1991
Definitions of Managed Objects
for the Ethernet-like Interface Types
Status of this Memo
This memo is an extension to the SNMP MIB. This RFC specifies an IAB
standards track protocol for the Internet community, and requests
discussion and suggestions for improvements. Please refer to the
current edition of the "IAB Official Protocol Standards" for the
standardization state and status of this protocol. Distribution of
this memo is unlimited.
Table of Contents
1. Abstract............................................... 1
2. The Network Management Framework....................... 1
3. Objects ............................................... 2
3.1 Format of Definitions ................................ 2
4. Overview .............................................. 3
5. Definitions ........................................... 4
5.1 The Generic Ethernet-like Group ...................... 4
5.2 The Ethernet-Like Statistics Group ................... 9
5.3 The Ethernet-like Collision Statistics Group ......... 16
5.4 802.3 Tests .......................................... 17
5.5 802.3 Hardware Chipsets .............................. 18
6. Acknowledgements ...................................... 19
7. References ............................................ 19
Security Considerations................................... 21
Author's Address.......................................... 21
1. Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in TCP/IP-based internets.
In particular, it defines objects for managing ethernet-like objects.
2. The Network Management Framework
The Internet-standard Network Management Framework consists of three
components. They are:
RFC 1155 which defines the SMI, the mechanisms used for describing
and naming objects for the purpose of management. RFC 1212
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RFC 1284 ETHERNET-LIKE OBJECTS December 1991
defines a more concise description mechanism, which is wholly
consistent with the SMI.
RFC 1156 which defines MIB-I, the core set of managed objects for
the Internet suite of protocols. RFC 1213, defines MIB-II, an
evolution of MIB-I based on implementation experience and new
operational requirements.
RFC 1157 which defines the SNMP, the protocol used for network
access to managed objects.
The Framework permits new objects to be defined for the purpose of
experimentation and evaluation.
3. Objects
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Objects in the MIB are
defined using the subset of Abstract Syntax Notation One (ASN.1) [7]
defined in the SMI. 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 SMI [3] 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.
The SMI specifies the use of the basic encoding rules of ASN.1 [8],
subject to the additional requirements imposed by the SNMP.
3.1. Format of Definitions
Section 5 contains contains the specification of all object types
contained in this MIB module. The object types are defined using the
conventions defined in the SMI, as amended by the extensions
specified in [13].
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RFC 1284 ETHERNET-LIKE OBJECTS December 1991
4. Overview
Instances of these object types represent attributes of an interface
to an ethernet-like communications medium. At present, ethernet-like
media are identified by three values of the ifType object in the
Internet-standard MIB:
ethernet-csmacd(6)
iso88023-csmacd(7)
starLan(11)
For these interfaces, the value of the ifSpecific variable in the
MIB-II [6] has the OBJECT IDENTIFIER value:
dot3 OBJECT IDENTIFER ::= { transmission 7 }
The definitions presented here are based on the IEEE 802.3 Layer
Management Specification [9], as originally interpreted by Frank
Kastenholz of Interlan in [10]. Implementors of these MIB objects
should note that the IEEE document explicitly describes (in the form
of Pascal pseudocode) when, where, and how various MAC attributes are
measured. The IEEE document also describes the effects of MAC
actions that may be invoked by manipulating instances of the MIB
objects defined here.
To the extent that some of the attributes defined in [9] are
represented by previously defined objects in the Internet-standard
MIB or in the generic interface extensions MIB [11], such attributes
are not redundantly represented by objects defined in this memo.
Among the attributes represented by objects defined in other memos
are the number of octets transmitted or received on a particular
interface, the number of frames transmitted or received on a
particular interface, the promiscuous status of an interface, the MAC
address of an interface, and multicast information associated with an
interface.
The relationship between an ethernet-like interface and an interface
in the context of the Internet-standard MIB is one-to-one. As such,
the value of an ifIndex object instance can be directly used to
identify corresponding instances of the objects defined herein.
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RFC 1284 ETHERNET-LIKE OBJECTS December 1991
5. Definitions
RFC1284-MIB DEFINITIONS ::= BEGIN
IMPORTS
Counter, Gauge
FROM RFC1155-SMI
transmission
FROM RFC1213-MIB
OBJECT-TYPE
FROM RFC-1212;
-- This MIB module uses the extended OBJECT-TYPE macro as
-- defined in [13]
-- this is the MIB module for ethernet-like objects
dot3 OBJECT IDENTIFIER ::= { transmission 7 }
-- the Generic Ethernet-like group
-- Implementation of this group is mandatory for all systems
-- that attach to an ethernet-like medium.
dot3Table OBJECT-TYPE
SYNTAX SEQUENCE OF Dot3Entry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"Status information and control variables for a
collection of ethernet-like interfaces attached to
a particular system."
::= { dot3 1 }
dot3Entry OBJECT-TYPE
SYNTAX Dot3Entry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"Status information and control variables for a
particular interface to an ethernet-like medium."
INDEX { dot3Index }
::= { dot3Table 1 }
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RFC 1284 ETHERNET-LIKE OBJECTS December 1991
Dot3Entry ::=
SEQUENCE {
dot3Index
INTEGER,
dot3InitializeMac
INTEGER,
dot3MacSubLayerStatus
INTEGER,
dot3MulticastReceiveStatus
INTEGER,
dot3TxEnabled
INTEGER,
dot3TestTdrValue
Gauge
}
dot3Index OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index value that uniquely identifies an
interface to an ethernet-like medium. The
interface identified by a particular value of this
index is the same interface as identified by the
same value of ifIndex."
::= { dot3Entry 1 }
dot3InitializeMac OBJECT-TYPE
SYNTAX INTEGER { initialized(1), uninitialized(2) }
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The initialization status of the MAC and PLS
(Physical Layer Signalling) subsystems for a
particular interface. The value initialized(1)
signifies that the subsystems for a particular
interface have been previously initialized; the
value uninitialized(2) signifies that they have
not been previously initialized.
Each alteration of an instance of this object to
either of the values initialized(1) or
uninitialized(2) is analogous to an invocation of
the initializeMAC action defined in [9] and has
the effect of (re-)initializing the MAC and PLS
subsystems for the associated interface. In
particular,
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RFC 1284 ETHERNET-LIKE OBJECTS December 1991
all management counters pertaining to the MAC
and PLS subsystems for said interface are
reset to zero;
the receive and transmit layer management
state variables (receiveEnabled and
transmitEnabled in [9]) are set to enable
reception and transmission of frames;
the promiscuous receive function is disabled;
and
multicast reception is disabled."
::= { dot3Entry 2 }
dot3MacSubLayerStatus OBJECT-TYPE
SYNTAX INTEGER { enabled(1), disabled(2) }
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The operational status of the MAC sublayer for a
particular interface. The value enabled(1)
signifies that the MAC sublayer for said interface
is operational for both transmitting and receiving
frames -- that is, that the value of both the
receive and transmit layer management state
variables (receiveEnabled and transmitEnabled in
[9]) for said interface are true. The value
disabled(2) signifies that the MAC sublayer for
said interface is not operational for either
transmitting or receiving frames. In particular,
the value of an instance of this object is
disabled(2) whenever the value of the
corresponding instance of the dot3Enabled object
is false(2).
Each alteration of an instance of this object to
the value enabled(1) is analogous to an invocation
of the enableMACSublayer action defined in [9] and
has the effect of starting normal transmit and
receive operations (from the ``idle'' state) on
the associated interface. In particular, such an
alteration has the effect of resetting the PLS for
said interface and of setting the receive and
transmit layer management state variables
(receiveEnabled and transmitEnabled in [9]) to be
true.
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RFC 1284 ETHERNET-LIKE OBJECTS December 1991
Each alteration of an instance of this object to
the value disabled(2) is analogous to an
invocation of the disableMACSublayer action
defined in [9] and has the effect of terminating
transmit and receive operations on the associated
interface. In particular, such an alteration has
the effect of setting the receive and transmit
layer management state variables (receiveEnabled
and transmitEnabled in [9]) to be false. Any
transmissions/receptions in progress are completed
before operation is terminated."
::= { dot3Entry 3 }
dot3MulticastReceiveStatus OBJECT-TYPE
SYNTAX INTEGER { enabled(1), disabled(2) }
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The multicast receive status for a particular
interface. The value enabled(1) signifies that
reception of multicast frames by the MAC sublayer
is enabled on said interface. The value
disabled(2) signifies that reception of multicast
frames by the MAC sublayer is not enabled on said
interface.
Each alteration of an instance of this object to
the value enabled(1) is analogous to an invocation
of the enableMulticastReceive action defined in
[9] and has the effect of enabling multicast frame
reception on the associated interface. Actual
reception of multicast frames is only possible on
an interface when the values for the associated
instances of the dot3MulticastReceiveStatus and
dot3MacSubLayerStatus objects are enabled(1) and
enabled(1), respectively.
Each alteration of an instance of this object to
the value disabled(2) is analogous to an
invocation of the disableMulticastReceive action
defined in [9] and has the effect of inhibiting
multicast frame reception on the associated
interface."
::= { dot3Entry 4 }
dot3TxEnabled OBJECT-TYPE
SYNTAX INTEGER { true(1), false(2) }
ACCESS read-write
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