| RFC : | rfc1665 |
| Title: | |
| Date: | July 1994 |
| Status: | PROPOSED STANDARD |
| Obsoleted by: | 1666 |
Network Working Group Z. Kielczewski
Request for Comments: 1665 Eicon Technology Corporation
Category: Standards Track D. Kostick
Bell Communications Research
K. Shih
Novell
Editors
July 1994
Definitions of Managed Objects
for SNA NAUs 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.
Table of Contents
1. Introduction ................................................ 2
2. The SNMPv2 Network Management Framework ..................... 2
2.1 Object Definitions ......................................... 2
3. Overview .................................................... 3
3.1 Applying MIB II to managing SNA NAUs ....................... 4
3.2 SNANAU MIB Structure ....................................... 4
3.2.1 snaNode group ............................................ 5
3.2.2 snaLu group .............................................. 6
3.2.3 snaMgtTools group ........................................ 7
3.2.4 Conformance statement .................................... 7
3.3 SNANAU MIB special feature ................................. 7
3.3.1 Row Creation mechanism ................................... 8
3.3.2 State Diagrams ........................................... 8
4. Object Definitions .......................................... 9
5. Acknowledgments ............................................. 66
6. References .................................................. 66
7. Security Considerations ..................................... 67
8. Authors' Addresses .......................................... 67
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RFC 1665 SNANAU MIB July 1994
1. Introduction
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it defines objects for managing the configuration,
monitoring and control of Physical Units (PUs) and Logical Units
(LUs) in an SNA environment. PUs and LUs are two types of Network
Addressable Units (NAUs) in the logical structure of an SNA network.
NAUs are the origination or destination points for SNA data streams.
This memo identifies managed objects for PU Type 1.0, 2.0 and Type
2.1 and LU Type 0, 1, 2, 3, 4, 7. The generic objects defined here
can also be used to manage LU 6.2 and any LU-LU session. The SNA
terms and overall architecture are documented in [1].
2. The SNMPv2 Network Management Framework
The SNMPv2 Network Management Framework consists of four major
components. They are:
o RFC 1442 [2] which defines the SMI, the mechanisms used for
describing and naming objects for the purpose of management.
o STD 17, RFC 1213 [3] defines MIB-II, the core set of managed
objects for the Internet suite of protocols.
o RFC 1445 [4] which defines the administrative and other
architectural aspects of the framework.
o RFC 1448 [5] which defines the protocol used for network
access to managed objects.
The Framework permits new objects to be defined for the purpose of
experimentation and evaluation.
2.1. Object Definitions
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)
defined in the SMI (RFC 1442 [2]). In particular, each object type
is named by an OBJECT IDENTIFIER, an administratively assigned name.
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 descriptor, to
refer to the object type.
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RFC 1665 SNANAU MIB July 1994
3. Overview
This document identifies the proposed set of objects for managing the
configuration, monitoring and control of Physical Units (PUs) and
Logical Units (LUs) in an SNA environment. In this document, the name
"Node" is used to describe SNA Node Type 1.0, 2.0 and Type 2.1 and
the name "LU" is used to describe Logical Unit of Type 0, 1, 2, 3, 4,
7 and 6.2. Note however that only objects common to all PU and LU
types are covered here and LU 6.2 specific objects are not included
in this MIB module.
Highlights of the management functions supported by the SNANAU MIB
module include the following:
o Creation/deletion of Nodes and LUs via the RowStatus objects
in the snaNodeAdminTable and in the snaLuAdminTable.
o Creation/deletion of table entries associating Node instances
with link instances via the RowStatus object in the
snaNodeLinkAdminTable
o Activation/Deactivation of Nodes via the AdminState object in
the snaNodeAdminTable
o Deactivation of sessions via the AdminState object in the
snaLuSessnTable
o Monitoring and modification of parameters related to Nodes, LUs,
and Node/link associations
o Monitoring of session operational parameters
o PU2.0 operational statistics
o Session operational statistics
o RTM statistics
o Traps for:
+ Node state change
+ Node activation failure
+ LU state change
+ LU session BIND failure
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RFC 1665 SNANAU MIB July 1994
This MIB module does not support:
o creation of links - the SNA DLC MIB [6] supports management
capabilities for links,
o activation or deactivation of LUs, nor
o activation of sessions.
3.1. Applying MIB II to managing SNA NAUs
This section identifies how MIB II objects, specifically the MIB II
system group will be used in SNMP-based management of SNA NAUs. The
MIB II system group applies to the SNMP Agent. The following object
is from the MIB II system group:
sysUpTime: clock in the SNMP Agent/proxy-Agent; expressed in
TimeTicks (1/100s of a seconds).
This MIB module uses the TimeStamp TEXTUAL-CONVENTION which is
defined in the SNMPv2 Textual Conventions (RFC 1443 [7]) as "the
value of MIB II's sysUpTime object when a specific occurrence
happens." The specific occurrences related to SNA NAU management are
defined in this MIB module.
3.2. SNANAU MIB Structure
The SNANAU MIB module contains three groups of objects:
o snaNode - objects related to Node configuration, monitoring and
control.
o snaLu - objects related to LU definition, monitoring and
control.
o snaMgtTools - objects related to specific management tools well
known in SNA environment.
These groups are described below in more detail.
The objects related to PUs and LUs are organized into two types of
tables: the Admin and Oper tables.
The "Admin" table contains parameters which are used by a Management
Station to affect the operation of the SNA service. Some parameters
are used to initialize and configure the SNA service at the next
startup, while others can take effect immediately. A Management
Station can dynamically define SNA resources (PUs, LUs) by creating
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RFC 1665 SNANAU MIB July 1994
new entries in the Admin table. It uses a special object, AdminState,
to control the desired state of a defined PU or LU Session resource.
Note that this MIB does not allow the manipulation of an LU's
operational state.
The "Oper" table is an extension (augment) of the corresponding Admin
table. It contains objects which correspond to the values of
parameters currently used by the SNA system.
3.2.1. snaNode group
The snaNode group consists of the following tables:
1) snaNodeAdminTable This table contains objects which describe
the configuration parameters of an SNA Node. Link-specific
configuration objects are contained in a separate MIB module
(e.g., the SNA DLC MIB module) corresponding to link type.
Entries in this table can be created, modified and deleted by
either an Agent or a Management Station. The snaNodeAdminRowStatus
object describes the status of an entry and is used to change the
status of that entry.
The snaNodeAdminState object describes the desired operational
state of a Node and is used to change the operational state of a
Node.
How an Agent or a Management Station obtains the initial value of
each object at creation time is an implementation specific issue
not addressed in this memo.
For each entry in the snaNodeAdminTable, there is a corresponding
entry in the snaNodeOperTable. While the objects in this table
describe the desired or configured operational values of the SNA
Node, the actual runtime values are contained in snaNodeOperTable.
2) snaNodeOperTable - Each row contains runtime and operational
state variables for a Node. It is an extension of
snaNodeAdminTable and as such uses the same index. The rows in
this table are created by an Agent as soon as the entry in the
Admin Table become 'active'. The entries in this table cannot be
modified by a Management Station.
3) snaPu20StatsTable - Each row contains statistics variables
(counters) for a PU 2.0. The entries in this table are indexed by
snaNodeAdminIndex. The rows in this table are created by an Agent
as soon as the corresponding entry in the snaNodeAdminTable
becomes 'active'.
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RFC 1665 SNANAU MIB July 1994
4) snaNodeLinkAdminTable - This table contains all references to
link- specific tables. If a Node is configured with multiple
links, then it will have multiple entries in this table. The
entries in this table can be generated initially, after startup of
SNA service, by the Agent which uses information from Node
configuration file. Subsequent modifications of parameters,
creation of new Node link entries and deletion of entries is
possible. The modifications to this table can be saved in the Node
configuration file for the next startup (i.e., restart or next
initialization) of SNA service, but the mechanism for this
function is not defined in this memo. Each entry contains the
configuration information that associates a Node instance to one
link instance. The entries are indexed by snaNodeAdminIndex and
snaNodeLinkAdminIndex.
5) snaNodeLinkOperTable - This table contains all references to
link- specific tables for operational parameters. If the Node is
configured for multiple links, then it will have multiple entries
in this table. This table augments the snaNodeLinkAdminTable.
6) snaNodeTraps - Two traps are defined for Nodes. The
snaNodeStateChangeTrap indicates that the operational state of a
Node has changed. The snaNodeActFailTrap indicates the failure of
ACTPU received from host.
3.2.2. snaLu group
The snaLu group consists of the following tables:
1) snaLuAdminTable - Table containing LU configuration
information. The rows in this table can be created and deleted by
a Management Station. Only objects which are common to all types
of LUs are included in this table. The entries are indexed by Node
and LU indices.
2) snaLuOperTable - Table containing dynamic runtime information
and control variables relating to LUs. Only objects which are
common to all types of LUs are included in this table. This table
augments the snaLuAdminTable.
3) snaLuSessnTable - This is a table containing objects which
describe the operational state of LU-LU sessions. Only objects
which are common to all types of LU-LU sessions are included in
this table. When a session enters the state 'pending-bind (2)',
the corresponding entry in the session table is created by the
Agent. When the session state becomes 'unbound (1)', then the
session will be removed from the session table by the Agent.
Entries are indexed by Node, Link, LU and session indices.
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RFC 1665 SNANAU MIB July 1994
4) snaLuSessnStatsTable - Table containing dynamic statistics
information relating to LU-LU sessions. The entries in this table
augment the entries in the snaLuSessnTable and cannot be created
by a Management Station.
5) snaLuTraps - Two traps are defined for LUs. The
snaLuStateChangeTrap indicates that the operational state of an LU
has changed. The snaLuSessnBindFailTrap indicates the failure of
a BIND request.
3.2.3. snaMgtTools group
This is an optional group. The snaMgtTools group consists of the
following table:
1) snaLuRtmTable Each row contains Response Time Monitor (RTM)
variables for an LU. The table is indexed by Node and LU indices.
Entries correspond to LU 2 entries in the snaLuAdminTable. A
Management Station can read collection of RTM statistics for a
given LU.
3.2.4. Conformance statement
Compliance of the SNMPv2 management entity to the SNANAU MIB is
defined in terms of following conformance units called groups.
Unconditionally mandatory groups: snaNodeGroup, snaLuGroup,
snaSessionGroup.
Conditionally mandatory groups: snaPu20Group - mandatory only for
those entities which implement PU type 2.0. The snaMgtToolsRtmGroup
- mandatory only for those entities which implement LU type 2 and
RTM.
Refinement of requirements for objects access: an Agent which does
not implement row creation for snaNodeAdminTable
snaNodeLinkAdminTable and snaLuAdminTable must at least support
object modification requests (i.e., read-write access instead of
read-create).
3.3. SNANAU MIB special feature
This section describes the mechanism used for row creation in the
Admin tables and also presents critical state transitions for PUs,
LUs and Sessions.
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RFC 1665 SNANAU MIB July 1994
3.3.1. Row Creation mechanism
The row creation mechanism for the Admin tables in this MIB module is
based on the use of the RowStatus object. Restriction of some
operations for specific tables are described in each table. In
particular, before accepting the 'destroy' value for an entry, an
Agent has to verify the operational state of the corresponding entry
in the Oper table.
3.3.2. State Diagrams
The following state diagram models the state transitions for Nodes.
When a row is created by a Management Station, an Agent creates the
Oper table entry for that Node with the OperState equal to
'inactive'. An Agent cannot accept any operations for that Node
until the RowStatus is set to 'active'.
OperState -> inactive active waiting stopping
--------------I--------------I--------------I-------------I---------
AdminState: I I I I
active I active I active I waiting I no
I I I I
inactive I inactive I stopping I inactive I stopping
I or inactive I
The following state diagram models state transitions for Sessions.
When a session goes to the 'unbound' state [1], the corresponding
entry will be removed from the Session table by the Agent.
OperState -> unbound pending-bind bound pending-unbind
--------------I--------------I--------------I---------I--------------
AdminState: I I I I
bound I no I no I no I no
I I I I
unbound I unbound I unbound I unbound I unbound
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RFC 1665 SNANAU MIB July 1994
4. Object Definitions
SNA-NAU-MIB DEFINITIONS ::= BEGIN
-- This MIB module contains objects necessary
-- for management of the following SNA devices: PU types 1.0, 2.0, 2.1
-- and LU types 0, 1, 2, 3, 4, 7. It also contains generic objects
-- which can be used to manage LU 6.2.
-- Naming conventions in this document:
-- The following names are used in object descriptors according to
-- SNA conventions.
-- The name 'PU' or 'Node' is used to describe Node type 1.0, 2.0 or
-- 2.1.
-- The name 'LU' is used to describe Logical Unit of type 0,1,2,3,
-- 4,7 or 6.2.
IMPORTS
DisplayString, RowStatus, TimeStamp, InstancePointer
FROM SNMPv2-TC
Counter32, Gauge32, Integer32,
OBJECT-TYPE, MODULE-IDENTITY, NOTIFICATION-TYPE
FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF;
snanauMIB MODULE-IDENTITY
LAST-UPDATED "9402041800Z"
ORGANIZATION "IETF SNA NAU MIB Working Group"
CONTACT-INFO
" Zbigniew Kielczewski
Eicon Technology Inc.
2196 32nd Avenue
Lachine, Que H8T 3H7
Canada
Tel: 1 514 631 2592
E-mail: zbig@eicon.qc.ca
Deirdre Kostick
Bell Communications Research
Red Bank, NJ 07701
Tel: 1 908 758 2642
Kielczewski, Kostick & Shih [Page 9]
RFC 1665 SNANAU MIB July 1994
E-mail: dck2@mail.bellcore.com
Kitty Shih (editor)
Novell
890 Ross Drive
Sunnyvale, CA 94089
Tel: 1 408 747 4305
E-mail: kmshih@novell.com"
DESCRIPTION
"This is the MIB module for objects used to
manage SNA devices."
::= { mib-2 34 }
-- The SNANAU MIB module contains an objects part and a conformance part.
-- Objects are organized into the following groups:
-- (1)snaNode group,
-- (2)snaLU group,
-- (3)snaMgtTools group.
snanauObjects OBJECT IDENTIFIER ::= { snanauMIB 1 }
snaNode OBJECT IDENTIFIER ::= { snanauObjects 1 }
snaLu OBJECT IDENTIFIER ::= { snanauObjects 2 }
snaMgtTools OBJECT IDENTIFIER ::= { snanauObjects 3}
-- ***************************************************************
-- snaNode group
--
-- It contains Managed Objects related to any type of Node and
-- some specific objects for Node Type 2.0.
-- ***************************************************************
-- ***************************************************************
-- The following table contains generic Node configuration
-- parameters.
-- ***************************************************************
snaNodeAdminTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaNodeAdminEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains objects which describe the
configuration parameters for an SNA Node. Link
specific configuration objects are contained in
a separate MIB module (e.g., SNA DLC MIB)
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RFC 1665 SNANAU MIB July 1994
corresponding to the link type.
The table snaNodeAdminLinkTable contains objects
which identify the relationship between node instances
and link instances.
The entries (i.e., rows) in this table can be created
by either an Agent or a Management Station.
The Management Station can do this through setting
the appropriate value in the snaNodeAdminRowStatus.
The snaNodeAdminRowStatus object describes the
status of an entry and is used to change the status
of an entry. The entry is deleted by an Agent based
on the value of the snaNodeAdminRowStatus.
The snaNodeAdminState object describes the desired
operational state of a Node and is used to change the
operational state of a Node. For example, such
information may be obtained from a configuration file.
How an Agent or a Management Station obtains the
initial value of each object at creation time is an
implementation specific issue.
For each entry in this table, there is a corresponding
entry in the snaNodeOperTable.
While the objects in this table describe the desired
or configured operational values of the SNA Node, the
actual runtime values are contained in
snaNodeOperTable."
::= { snaNode 1 }
snaNodeAdminEntry OBJECT-TYPE
SYNTAX SnaNodeAdminEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry contains the configuration parameters for
one SNA Node instance. The objects in the entry
have read-create access.
An entry can be created, modified or deleted. The
object snaNodeAdminRowStatus is used (i.e., set) to
create or delete a row entry."
INDEX { snaNodeAdminIndex }
::= { snaNodeAdminTable 1 }
SnaNodeAdminEntry ::= SEQUENCE {
snaNodeAdminIndex
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RFC 1665 SNANAU MIB July 1994
Integer32,
snaNodeAdminName
DisplayString,
snaNodeAdminType
INTEGER,
snaNodeAdminXidFormat
INTEGER,
snaNodeAdminBlockNum
DisplayString,
snaNodeAdminIdNum
DisplayString,
snaNodeAdminEnablingMethod
INTEGER,
snaNodeAdminLuTermDefault
INTEGER,
snaNodeAdminMaxLu
Integer32,
snaNodeAdminHostDescription
DisplayString,
snaNodeAdminStopMethod
INTEGER,
snaNodeAdminState
INTEGER,
snaNodeAdminRowStatus
RowStatus
}
snaNodeAdminIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Index used to uniquely identify each Node instance.
If an Agent creates the entry, then it will assign
this number otherwise a Management Station
generates a random number when it reserves the
entry for creation."
::= { snaNodeAdminEntry 1 }
snaNodeAdminName OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..17))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the desired name of the
Node for use during Node activation.
In Type 2.1 networks, this is a fully-qualified name,
meaning that the Node name is preceded by the NetId (if
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RFC 1665 SNANAU MIB July 1994
present) with a period as the delimiter.
A write operation to this object will
not change the operational value reflected
in snaNodeOperName until the Node has
been re-activated (e.g., after the next initialization
of the SNA services)."
::= { snaNodeAdminEntry 2 }
snaNodeAdminType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
pu10(2),
pu20(3),
t21len(4),
endNode(5),
networkNode(6)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the type of SNA Node.
A write operation to this object will
not change the operational value reflected
in snaNodeOperType until the Node has
been re-activated (e.g., after the next initialization
of the SNA services)."
::= { snaNodeAdminEntry 3 }
snaNodeAdminXidFormat OBJECT-TYPE
SYNTAX INTEGER {
format0(1),
format1(2),
format3(3)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the type of XID format used for
this Node.
Note that there is no format type 2.
A write operation to this object will
not change the operational value reflected
in snaNodeOperAdminXidFormat until the Node has
been re-activated (e.g., after the next initialization
of the SNA services)."
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RFC 1665 SNANAU MIB July 1994
::= { snaNodeAdminEntry 4 }
snaNodeAdminBlockNum OBJECT-TYPE
SYNTAX DisplayString (SIZE(3))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the block number for this Node
instance. It is the first 3 hexadecimal digits of the
SNA Node id.
A write operation to this object will
not change the operational value reflected
in snaNodeOperBlockNum until the Node has
been re-activated (e.g., after the next initialization
of the SNA services)."
::= { snaNodeAdminEntry 5 }
snaNodeAdminIdNum OBJECT-TYPE
SYNTAX DisplayString (SIZE(5))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the ID number for this Node
instance. This is the last 5 hexadecimal digits of
the SNA Node id.
A write operation to this object will
not change the operational value reflected
in snaNodeOperIdNum until the Node has
been re-activated (e.g., after the next initialization
of the SNA services)."
::= { snaNodeAdminEntry 6 }
snaNodeAdminEnablingMethod OBJECT-TYPE
SYNTAX INTEGER {
other (1),
startup (2),
demand (3),
onlyMS (4)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates how the Node should be
activated for the first time.
The values have the following meanings:
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RFC 1665 SNANAU MIB July 1994
other (1) - may be used for proprietary methods
not listed in this enumeration,
startup (2) - at SNA services' initialization time
(this is the default),
demand (3) - only when LU is requested by application,
or
onlyMS (4) - by a Management Station only.
A write operation to this object may immediately
change the operational value reflected
in snaNodeOperEnablingMethod depending
on the Agent implementation. If the Agent
implementation accepts immediate changes, then the
behavior of the Node changes immediately and not only
after the next system startup of the SNA services.
An immediate change may only apply when the
current value `demand (3)' is changed to `onlyMS (4)'
and vice versa."
::= { snaNodeAdminEntry 7 }
snaNodeAdminLuTermDefault OBJECT-TYPE
SYNTAX INTEGER {
unbind (1),
termself (2),
rshutd (3),
poweroff(4)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the desired default method
used to deactivate LUs for this Node
For LU6.2s, `unbind(1)' is the only valid value.
unbind(1) - terminate the LU-LU session by sending
an SNA UNBIND request.
termself(2) - terminate the LU-LU session by sending
an SNA TERM-SELF (Terminate Self) request on
the SSCP-LU session. The SSCP will inform the
remote session LU partner to send an UNBIND
request to terminate the session.
rshutd(3) - terminate the LU-LU session by sending
an SNA RSHUTD (Request ShutDown) request to
the remote session LU partner. The remote LU
will then send an UNBIND request to terminate
the session.
poweroff(4) - terminate the LU-LU session by sending
either an SNA LUSTAT (LU Status) request on
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RFC 1665 SNANAU MIB July 1994
the LU-LU session or an SNA NOTIFY request on
the SSCP-LU session indicating that the LU has
been powered off. Sending both is also
acceptable. The result should be that the
remote session LU partner will send an UNBIND
to terminate the session.
The default behavior indicated by the value of this
object may be overridden for an LU instance. The
override is performed by setting the snaLuAdminTerm
object instance in the snaLuAdminTable to the desired
value.
A write operation to this object may immediately
change the operational value reflected
in snaNodeOperLuTermDefault depending
on the Agent implementation."
::= { snaNodeAdminEntry 8 }
snaNodeAdminMaxLu OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum number of LUs that may be
activated for this Node. For PU2.1, this object
refers to the number of dependent LUs.
A write operation to this object will
not change the operational value reflected
in snaNodeOperMaxLu until the Node has
been re-activated (e.g., after the next initialization
of the SNA services)."
::= { snaNodeAdminEntry 9 }
snaNodeAdminHostDescription OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..128))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value identifies the remote host associated
with this Node. Since SSCP Id's may not be unique
across hosts, the host description
is required to uniquely identify the SSCP.
This object is only applicable to PU2.0 type
Nodes. If the remote host is unknown, then the
value is the null string.
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RFC 1665 SNANAU MIB July 1994
A write operation to this object may immediately
change the operational value reflected
in snaNodeOperHostDescription depending
on the Agent implementation."
::= { snaNodeAdminEntry 10 }
snaNodeAdminStopMethod OBJECT-TYPE
SYNTAX INTEGER {
other (1),
normal (2),
immed (3),
force (4)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the desired method to be used
by the Agent to stop a Node (i.e., change the Node's
operational state to inactive(1) ).
The values have the following meaning:
other (1) - used for proprietary
methods not listed in this enumeration.
normal(2) - deactivate only when there is no more
activity on this Node (i.e., all data flows
have been completed and all sessions
have been terminated).
immed(3) - deactivate immediately regardless of
current activities on this Node. Wait for
deactivation responses (from remote Node)
before changing the Node state to inactive.
force(4) - deactivate immediately regardless of
current activities on this Node. Do not wait
for deactivation responses (from remote Node)
before changing the Node state to inactive.
A write operation to this object may immediately
change the operational value reflected
in snaNodeOperStopMethod depending
on the Agent implementation."
::= { snaNodeAdminEntry 11 }
snaNodeAdminState OBJECT-TYPE
SYNTAX INTEGER {
inactive (1),
active (2)
}
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RFC 1665 SNANAU MIB July 1994
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value indicates the desired operational
state of the SNA Node. This object is used
by the Management Station to
activate or deactivate the Node.
If the current value in snaNodeOperState is
`active (2)', then setting this object to
`inactive (1)' will initiate the Node shutdown
process using the method indicated
by snaNodeOperStopMethod.
If the current value in snaNodeOperState is
`inactive (1)', then setting this object to
`active (2)' will initiate the
Node's activation.
A Management Station can always set this object to
`active (2)' irrespective of the value in the
snaOperEnablingMethod."
::= { snaNodeAdminEntry 12 }
snaNodeAdminRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object is used by a Management Station to
create or delete the row entry in the
snaNodeAdminTable following
the RowStatus textual convention.
Upon successful creation of
the row, an Agent automatically creates a
corresponding entry in the snaNodeOperTable with
snaNodeOperState equal to `inactive (1)'.
Row deletion can be Management Station or Agent
initiated:
(a) The Management Station can set the value to
`destroy (6)' only when the value of
snaNodeOperState of this Node instance is
`inactive (1)'. The Agent will then delete the rows
corresponding to this Node instance from the
snaNodeAdminTable and the snaNodeOperTable.
(b) The Agent detects that a row is in the
Kielczewski, Kostick & Shih [Page 18]
RFC 1665 SNANAU MIB July 1994
`notReady (3)' state for greater than a
default period of 5 minutes.
(c) All rows with the snaNodeAdminRowStatus object's
value of `notReady (3)' will be removed upon the
next initialization of the SNA services."
::= { snaNodeAdminEntry 13 }
-- ***************************************************************
-- The following object is updated when there is a change to
-- the value of any object in the snaNodeAdminTable.
-- ***************************************************************
snaNodeAdminTableLastChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value indicates the timestamp
(e.g., the Agent's sysUpTime value) of the last
change made to any object in the snaNodeAdminTable,
including row deletions/additions (e.g., changes to
snaNodeAdminRowStatus values).
This object can be used to reduce frequent
retrievals of the snaNodeAdminTable by a Management
Station. It is expected that a Management Station
will periodically poll this object and compare its
current value with the previous one. A difference
indicates that some Node configuration information
has been changed. Only then will the Management
Station retrieve the entire table."
::= { snaNode 2 }
-- ***************************************************************
-- The following table contains Node operational parameters.
-- ***************************************************************
snaNodeOperTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaNodeOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains the dynamic parameters which
have read-only access. These objects reflect the
actual status of the Node. The entries in this
table cannot be created or modified by a
Kielczewski, Kostick & Shih [Page 19]
RFC 1665 SNANAU MIB July 1994
Management Station.
This table augments the snaNodeAdminTable."
::= { snaNode 3 }
snaNodeOperEntry OBJECT-TYPE
SYNTAX SnaNodeOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The entry contains parameters which describe the
state of one Node. The entries are created by the
Agent. They have read-only access."
AUGMENTS { snaNodeAdminEntry }
::= { snaNodeOperTable 1 }
SnaNodeOperEntry ::= SEQUENCE {
snaNodeOperName
DisplayString,
snaNodeOperType
INTEGER,
snaNodeOperXidFormat
INTEGER,
snaNodeOperBlockNum
DisplayString,
snaNodeOperIdNum
DisplayString,
snaNodeOperEnablingMethod
INTEGER,
snaNodeOperLuTermDefault
INTEGER,
snaNodeOperMaxLu
Integer32,
snaNodeOperHostDescription
DisplayString,
snaNodeOperStopMethod
INTEGER,
snaNodeOperState
INTEGER,
snaNodeOperHostSscpId
OCTET STRING,
snaNodeOperStartTime
TimeStamp,
snaNodeOperLastStateChange
TimeStamp,
snaNodeOperActFailures
Counter32,
snaNodeOperActFailureReason
INTEGER
Kielczewski, Kostick & Shih [Page 20]
RFC 1665 SNANAU MIB July 1994
}
snaNodeOperName OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..17))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the current name of the Node.
In Type 2.1 networks, this
is a fully-qualified name, meaning that the Node name
is preceded by the NetId (if present) with a period
as the delimiter."
::= { snaNodeOperEntry 1 }
snaNodeOperType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
pu10(2),
pu20(3),
t21LEN(4),
endNode(5),
networkNode(6)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the current type of the Node."
::= { snaNodeOperEntry 2 }
snaNodeOperXidFormat OBJECT-TYPE
SYNTAX INTEGER {
format0 (1),
format1 (2),
format3 (3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the type of XID format currently
used for this Node.
Note that there is no format type 2."
::= { snaNodeOperEntry 3 }
snaNodeOperBlockNum OBJECT-TYPE
SYNTAX DisplayString (SIZE(3))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
Kielczewski, Kostick & Shih [Page 21]
RFC 1665 SNANAU MIB July 1994
"The value identifies the block number for this Node
instance. It is the first 3 hexadecimal digits
of the SNA Node id."
::= { snaNodeOperEntry 4 }
snaNodeOperIdNum OBJECT-TYPE
SYNTAX DisplayString (SIZE(5))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the ID number for this Node
instance. This is the last 5 hexadecimal digits of
the SNA Node id."
::= { snaNodeOperEntry 5 }
snaNodeOperEnablingMethod OBJECT-TYPE
SYNTAX INTEGER {
other (1),
startup (2),
demand (3),
onlyMS (4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value indicates how the Node is activated for
the first time.
The values have the following meanings:
other (1) - not at boot time, LU activation
or by a Management Station;
startup (2) - at SNA services' initialization
time (this is the default),
demand (3) - only when LU is requested by
application,
onlyMS (4) - by a network Management Station
only."
::= { snaNodeOperEntry 6 }
snaNodeOperLuTermDefault OBJECT-TYPE
SYNTAX INTEGER {
unbind (1),
termself (2),
rshutd (3),
poweroff (4)
}
MAX-ACCESS read-only
STATUS current
Kielczewski, Kostick & Shih [Page 22]
RFC 1665 SNANAU MIB July 1994
DESCRIPTION
"The value identifies the default method used to
deactivate LUs for this Node.
For LU6.2s, 'unbind(1)' is the only valid value.
unbind(1) - terminate the LU-LU session by sending
an SNA UNBIND request.
termself(2) - terminate the LU-LU session by sending
an SNA TERM-SELF (Terminate Self) request on
the SSCP-LU session. The SSCP will inform the
remote session LU partner to send an UNBIND
request to terminate the session.
rshutd(3) - terminate the LU-LU session by sending
an SNA RSHUTD (Request ShutDown) request to
the remote session LU partner. The remote LU
will then send an UNBIND request to terminate
the session.
poweroff(4) - terminate the LU-LU session by sending
either an SNA LUSTAT (LU Status) request on
the LU-LU session or an SNA NOTIFY request on
the SSCP-LU session indicating that the LU has
been powered off. Sending both is also
acceptable. The result should be that the
remote session LU partner will send an UNBIND
to terminate the session.
This object describes the default behavior for this Node;
however, it is possible that for a specific LU the
behavior indicated by the snaLuOperTerm object is
different."
::= { snaNodeOperEntry 7 }
snaNodeOperMaxLu OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value identifies the current, maximum number
of LUs that are activated for this Node. For PU2.1,
this object refers to the number of dependent LUs."
::= { snaNodeOperEntry 8 }
snaNodeOperHostDescription OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..128))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
Kielczewski, Kostick & Shih [Page 23]
RFC 1665 SNANAU MIB July 1994
"This value identifies the remote host currently
associated with this Node.
Since SSCP Id's may not be unique
across hosts, the host description
is required to uniquely identify the SSCP."
::= { snaNodeOperEntry 9 }
snaNodeOperStopMethod OBJECT-TYPE
SYNTAX INTEGER {
other (1),
normal (2),
immed (3),
force (4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value identifies the current Node shutdown
method to be used by the Agent to stop the Node.
When the Agent changes the Node's state to 'inactive
(1)', the Agent must use the shutdown method
indicated by this object.
The values have the following meaning:
other (1) - proprietary method not listed in this
enumeration
normal(2) - deactivate only when there is no more
activity on this Node (i.e., all data flows
have been completed and all sessions have
been terminated).
immed(3) - deactivate immediately regardless of
current activities on this Node. Wait for
deactivation responses (from remote Node)
before changing the Node state to inactive.
force(4) - deactivate immediately regardless of
current activities on this Node. Do not wait
for deactivation responses (from remote Node)
before changing the Node state to inactive.
Note that a write operation to
snaNodeAdminOperStopMethod may immediately change
the value of snaNodeOperStopMethod depending on
the Agent implementation."
::= { snaNodeOperEntry 10 }
snaNodeOperState OBJECT-TYPE
SYNTAX INTEGER {
Kielczewski, Kostick & Shih [Page 24]
RFC 1665 SNANAU MIB July 1994
inactive (1),
active (2),
waiting (3),
stopping (4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The current state of the Node.
The values have the following meanings:
inactive (1), a row representing the Node has
been created in the AdminTable
and, the Node is ready for activation -or-
an active Node has been stopped -or-
a waiting Node has returned to the inactive
state.
waiting (3), a request to have the Node activated
has been issued, and the Node is pending
activation.
active (2), the Node is ready and operating.
stopping (4), the request to stop the Node has
been issued while the StopMethod normal
or immediate is used."
::= { snaNodeOperEntry 11 }
snaNodeOperHostSscpId OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(0..6))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value identifies the current SSCP Id
associated with the Node. This object is only
applicable to PU 2.0s. If the Node
is not a PU 2.0 type, then this object contains a
zero length string."
::= { snaNodeOperEntry 12 }
snaNodeOperStartTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The timestamp (e.g, the Agent's sysUpTime value)
at the Node activation."
::= { snaNodeOperEntry 13 }
snaNodeOperLastStateChange OBJECT-TYPE
SYNTAX TimeStamp
Kielczewski, Kostick & Shih [Page 25]
RFC 1665 SNANAU MIB July 1994
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The timestamp (e.g., the Agent's sysUpTime value)
at the last state change of the Node."
::= { snaNodeOperEntry 14 }
snaNodeOperActFailures OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value identifies the number of failed Node
activation attempts."
::= { snaNodeOperEntry 15 }
snaNodeOperActFailureReason OBJECT-TYPE
SYNTAX INTEGER {
other (1),
linkFailure (2),
noResources (3),
badConfiguration (4),
internalError (5)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value indicates the reason for the activation
failure. The value `other (1)' indicates a reason
not listed in the enumeration. This object
will be sent in the trap snaNodeActFailTrap."
::= { snaNodeOperEntry 16 }
-- ***************************************************************
-- The following object is updated when there is a change to
-- the value of snaNodeOperState in any row or a row is
-- added/deleted from the snaNodeOperTable via the snaNodeAdminTable.
-- ***************************************************************
snaNodeOperTableLastChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The timestamp (e.g., the Agent's sysUpTime value)
at the last change made to any object in the
Kielczewski, Kostick & Shih [Page 26]
RFC 1665 SNANAU MIB July 1994
snaNodeOperTable, including row deletions/additions
made as a result of changes to the
snaNodeAdminRowStatus object.
This object can be used to reduce frequent
retrievals of the snaNodeOperTable by a Management
Station. It is expected that a Management Station
will periodically poll this object and compare its
current value with the previous one. A difference
indicates that some Node operational information
has been changed. Only then will the Management
Station retrieve the entire table."
::= { snaNode 4 }
-- ***************************************************************
-- The following table contains PU 2.0 statistics dynamic parameters.
-- ***************************************************************
snaPu20StatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaPu20StatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains the dynamic parameters which
have read-only access. The entries in this table
correspond to PU 2.0 entries in the snaNodeOperTable
and cannot be created by a Management Station."
::= { snaNode 5 }
snaPu20StatsEntry OBJECT-TYPE
SYNTAX SnaPu20StatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The entry contains parameters which describe the
statistics for one PU 2.0. They have read-only
access.
The counters represent traffic for all kinds
of sessions: LU-LU, SSCP-PU, SSCP-LU.
Each Node of PU Type 2.0 from the snaNodeAdminTable
has one entry in this table and the index used
here has the same value as snaNodeAdminIndex of
that PU. The entry is created by the Agent."
INDEX { snaNodeAdminIndex }
::= { snaPu20StatsTable 1 }
Kielczewski, Kostick & Shih [Page 27]
RFC 1665 SNANAU MIB July 1994
SnaPu20StatsEntry ::= SEQUENCE {
snaPu20StatsSentBytes
Counter32,
snaPu20StatsReceivedBytes
Counter32,
snaPu20StatsSentPius
Counter32,
snaPu20StatsReceivedPius
Counter32,
snaPu20StatsSentNegativeResps
Counter32,
snaPu20StatsReceivedNegativeResps
Counter32,
snaPu20StatsActLus
Gauge32,
snaPu20StatsInActLus
Gauge32,
snaPu20StatsBindLus
Gauge32
}
snaPu20StatsSentBytes OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of bytes sent by this Node."
::= { snaPu20StatsEntry 1 }
snaPu20StatsReceivedBytes OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of bytes received by this Node."
::= { snaPu20StatsEntry 2 }
snaPu20StatsSentPius OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of PIUs sent by this Node."
::= { snaPu20StatsEntry 3 }
snaPu20StatsReceivedPius OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
Kielczewski, Kostick & Shih [Page 28]
RFC 1665 SNANAU MIB July 1994
STATUS current
DESCRIPTION
"The number of PIUs received by this Node."
::= { snaPu20StatsEntry 4 }
snaPu20StatsSentNegativeResps OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of negative responses sent
by this Node."
::= { snaPu20StatsEntry 5 }
snaPu20StatsReceivedNegativeResps OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of negative responses received
by this Node."
::= { snaPu20StatsEntry 6 }
snaPu20StatsActLus OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of LUs on this PU which have
received and responded to ACTLU from the host."
::= { snaPu20StatsEntry 7 }
snaPu20StatsInActLus OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of LUs on this PU which have
not received an ACTLU from the host. This is
possible if the number of configured LUs exceeds
that on the host."
::= { snaPu20StatsEntry 8 }
snaPu20StatsBindLus OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
Kielczewski, Kostick & Shih [Page 29]
RFC 1665 SNANAU MIB July 1994
"The number of LUs on this PU which have
received and acknowledged a BIND request from the
host."
::= { snaPu20StatsEntry 9 }
-- ***************************************************************
-- The following table contains the association between Nodes and
-- link identifiers.
-- It is used for configuration purposes.
-- ***************************************************************
snaNodeLinkAdminTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaNodeLinkAdminEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains the references to link
specific tables. If a Node is configured for
multiple links, then the Node will have
multiple entries in this table.
The entries in this table can be generated
initially, after initialization of SNA service,
by the Agent which uses information from
Node configuration file.
Subsequent modifications of parameters,
creation of new Nodes link entries and deletion
of entries is possible.
The modification to this table can be
saved in the Node configuration file for the
next initialization of SNA service, but the mechanism
for this function is not defined here."
::= { snaNode 6 }
snaNodeLinkAdminEntry OBJECT-TYPE
SYNTAX SnaNodeLinkAdminEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entry contains the configuration information that
associates a Node instance to one link instance.
The objects in the entry have read-create access.
Entry can be created, modified or deleted.
The object snaNodeLinkAdminRowStatus is used (set)
to create or delete an entry.
The object snaNodeLinkAdminSpecific can be set
later, after the entry has been created."
INDEX { snaNodeAdminIndex,
Kielczewski, Kostick & Shih [Page 30]
RFC 1665 SNANAU MIB July 1994
snaNodeLinkAdminIndex }
::= { snaNodeLinkAdminTable 1 }
SnaNodeLinkAdminEntry ::= SEQUENCE {
snaNodeLinkAdminIndex
Integer32,
snaNodeLinkAdminSpecific
InstancePointer,
snaNodeLinkAdminMaxPiu
Integer32,
snaNodeLinkAdminRowStatus
RowStatus
}
snaNodeLinkAdminIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This value is used to index the instances of objects.
If an Agent creates the entry, then it will assign
this number otherwise a Management Station
generates a random number when it reserves the
entry for creation."
::= { snaNodeLinkAdminEntry 1 }
snaNodeLinkAdminSpecific OBJECT-TYPE
SYNTAX InstancePointer
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This value points to the ifIndex value
instance (in the sdlcLSAdminTable of
the SNA DLC MIB module) that corresponds to the link.
SDLC link-specific information is provided in the
SNA DLC MIB."
::= { snaNodeLinkAdminEntry 2 }
snaNodeLinkAdminMaxPiu OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This value identifies the maximum number of octets
that can be exchanged by this Node in one
Path Information Unit (PIU)."
::= { snaNodeLinkAdminEntry 3 }
Kielczewski, Kostick & Shih [Page 31]
RFC 1665 SNANAU MIB July 1994
snaNodeLinkAdminRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object is used by a Management Station to
create or delete the row entry in the
snaNodeLinkAdminTable.
To activate a row, a Management Station sets the value
to 'active (1)' or 'notReady (3)'. Upon successful
creation of the row, the Agent automatically creates
a corresponding entry in the snaNodeLinkOperTable.
Row deletion can be Management Station or Agent
initiated:
(a) The Management Station can set the value to
`destroy (6)' only when the value of
snaNodeLinkOperState of this Link
instance is `inactive (1)'. The Agent will then
delete the row corresponding to this Link
instance from snaNodeLinkOperTable and
from snaNodeLinkAdminTable.
(b) The Agent detects that a row is in the
`notReady (3)' state for greater than a
default period of 5 minutes.
(c) The Agent will not include a row with RowStatus=
`notReady (3)', after SNA system re-initialization
(e.g., reboot)."
::= { snaNodeLinkAdminEntry 4 }
-- ***************************************************************
-- The following object is updated when there is a change to
-- the value of any object in the snaNodeLinkAdminTable.
-- ***************************************************************
snaNodeLinkAdminTableLastChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The timestamp (e.g., the Agent's sysUpTime value)
at the last
change made to any object in the snaNodeLinkAdminTable,
including row deletions/additions (i.e., changes
to the snaNodeLinkAdminRowStatus object).
Kielczewski, Kostick & Shih [Page 32]
RFC 1665 SNANAU MIB July 1994
This object can be used to reduce frequent
retrievals of the snaNodeLinkAdminTable by a
Management Station. It is expected that a
Management Station will periodically poll this
object and compare its current value with the
previous one.
A difference indicates that some Node operational
information has been changed. Only then will the
Management Station retrieve the entire table."
::= { snaNode 7 }
-- ***************************************************************
-- The following table contains the association between
-- Nodes and link identifiers.
-- It provides the current status.
-- ***************************************************************
snaNodeLinkOperTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaNodeLinkOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains all references to link
specific tables for operational parameters.
If a Node is configured for multiple links,
then the Node will have multiple entries in
this table. This table augments the
snaNodeLinkAdminTable."
::= { snaNode 8 }
snaNodeLinkOperEntry OBJECT-TYPE
SYNTAX SnaNodeLinkOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entry contains all current parameters for one
Node link. The objects in the entry have
read-only access."
AUGMENTS { snaNodeLinkAdminEntry }
::= { snaNodeLinkOperTable 1 }
SnaNodeLinkOperEntry ::= SEQUENCE {
snaNodeLinkOperSpecific
InstancePointer,
snaNodeLinkOperMaxPiu
Integer32
}
Kielczewski, Kostick & Shih [Page 33]
RFC 1665 SNANAU MIB July 1994
snaNodeLinkOperSpecific OBJECT-TYPE
SYNTAX InstancePointer
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the object identifier representing
the instance of the ifIndex object in
the sdlcLSOperTable (of the SNA DLC MIB module).
The associated sdlcLSOperTable row
will contain information on the link instance."
::= { snaNodeLinkOperEntry 1 }
snaNodeLinkOperMaxPiu OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Maximum number of octets that can
be exchanged by this Node in one Path
Information Unit (PIU)."
::= { snaNodeLinkOperEntry 2 }
-- ***************************************************************
-- The following object is updated when a row is added/deleted
-- from the snaNodeLinkOperTable.
-- ***************************************************************
snaNodeLinkOperTableLastChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The timestamp of the last
change made to any object in the snaNodeLinkOperTable,
including row deletions/additions.
This object can be used to reduce frequent
retrievals of the snaNodeLinkOperTable by a
Management Station. It is expected that a
Management Station will periodically poll this
object and compare its current value with the
previous one.
A difference indicates that some Node operational
information has been changed. Only then will the
Management Station retrieve the entire table."
::= { snaNode 9 }
Kielczewski, Kostick & Shih [Page 34]
RFC 1665 SNANAU MIB July 1994
-- ***************************************************************
-- Traps
-- ***************************************************************
snaNodeTraps OBJECT IDENTIFIER ::= { snaNode 10 }
snaNodeStateChangeTrap NOTIFICATION-TYPE
OBJECTS { snaNodeOperName,
snaNodeOperState }
STATUS current
DESCRIPTION
"This trap indicates that the operational state
(i.e., value of the snaNodeOperState object) of a Node
has changed. The following variables are returned:
snaNodeOperName - current name of the Node,
with the instance identifying the Node; and,
snaNodeOperState - current state after
the change."
::= { snaNodeTraps 1 }
snaNodeActFailTrap NOTIFICATION-TYPE
OBJECTS { snaNodeOperName,
snaNodeOperState,
snaNodeOperActFailureReason }
STATUS current
DESCRIPTION
"This trap indicates a Node activation failure.
The value of snaNodeOperState indicates the current
state after the activation attempt.
The value of snaNodeOperActFailureReason indicates
the failure reason."
::= { snaNodeTraps 2 }
-- ***************************************************************
-- snaLu group
--
-- It contains Managed Objects related to LUs in general and some
-- specific for LUs of type 0, 1, 2, 3.
-- ***************************************************************
-- ***************************************************************
-- The following table contains LU configuration parameters.
-- ***************************************************************
Kielczewski, Kostick & Shih [Page 35]
RFC 1665 SNANAU MIB July 1994
snaLuAdminTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaLuAdminEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains LU configuration information.
The rows in this table can be created and deleted
by a Management Station.
Only objects which are common to all types of LUs
are included in this table."
::= { snaLu 1 }
snaLuAdminEntry OBJECT-TYPE
SYNTAX SnaLuAdminEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Contains configuration variables for an LU."
INDEX { snaNodeAdminIndex, snaLuAdminLuIndex }
::= { snaLuAdminTable 1 }
SnaLuAdminEntry ::= SEQUENCE {
snaLuAdminLuIndex
Integer32,
snaLuAdminName
DisplayString,
snaLuAdminSnaName
DisplayString,
snaLuAdminType
INTEGER,
snaLuAdminDepType
INTEGER,
snaLuAdminLocalAddress
OCTET STRING,
snaLuAdminDisplayModel
INTEGER,
snaLuAdminTerm
INTEGER,
snaLuAdminRowStatus
RowStatus
}
snaLuAdminLuIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This value identifies the unique index for an
Kielczewski, Kostick & Shih [Page 36]
RFC 1665 SNANAU MIB July 1994
LU instance within a Node."
::= { snaLuAdminEntry 1 }
snaLuAdminName OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..48))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This value identifies the user configurable
name for this LU. If a name is not assigned to the LU,
then this object contains a zero length string.
A write operation to this object will
not change the operational value reflected
in snaLuOperName until the Node has
been re-activated (e.g., after the next
initialization of the SNA services)."
::= { snaLuAdminEntry 2 }
snaLuAdminSnaName OBJECT-TYPE
SYNTAX DisplayString (SIZE(1..17))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This value identifies the SNA LU name
used in exchange of SNA data.
A write operation to this object will
not change the operational value reflected
in snaLuOperSnaName until the Node has
been re-activated (e.g., after the next
initialization of the SNA services)."
::= { snaLuAdminEntry 3 }
snaLuAdminType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
lu0(2),
lu1(3),
lu2(4),
lu3(5),
lu4(6),
lu62(7),
lu7(8)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
Kielczewski, Kostick & Shih [Page 37]
RFC 1665 SNANAU MIB July 1994
"This value identifies the LU type.
A write operation to this object will
not change the operational value reflected
in snaLuOperAdminType until the Node has
been re-activated (e.g., after the next
initialization of the SNA services)."
::= { snaLuAdminEntry 4 }
snaLuAdminDepType OBJECT-TYPE
SYNTAX INTEGER {
dependent(1),
independent(2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This value identifies whether the LU is
dependent or independent.
A write operation to this object will
not change the operational value reflected
in snaLuOperDepType until the Node has
been re-activated (e.g., after the next
initialization of the SNA services)."
::= { snaLuAdminEntry 5 }
snaLuAdminLocalAddress OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(1))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The local address for this LU is a byte with a value
ranging from 0 to 254.For dependent LUs, this value
ranges from 1 to 254 and for independent LUs this
value is always 0.
A write operation to this object will not change the
operational value reflected in snaLuOperLocalAddress
until the Node has been re-activated (e.g., after the
next initialization of the SNA services)."
::= { snaLuAdminEntry 6 }
snaLuAdminDisplayModel OBJECT-TYPE
SYNTAX INTEGER {
invalid(1),
model2A(2),
model2B(3),
Kielczewski, Kostick & Shih [Page 38]
RFC 1665 SNANAU MIB July 1994
model3A(4),
model3B(5),
model4A(6),
model4B(7),
model5A(8),
model5B(9),
dynamic(10)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value of this object identifies the model type
and screen size of the terminal connected to the host.
This is only valid for LU Type 2. The values have
the following meaning:
model2A(2) - Model 2 (24 rows x 80 cols) with base
attributes
model2B(3) - Model 2 (24 rows x 80 cols) with
extended attributes
model3A(4) - Model 3 (32 rows x 80 cols) with base
attributes
model3B(5) - Model 3 (32 rows x 80 cols) with extended
attributes
model4A(6) - Model 4 (43 rows x 80 cols) with base
attributes
model4B(7) - Model 4 (43 rows x 80 cols) with extended
attributes
model5A(8) - Model 5 (27 rows x 132 cols) with base
attributes
model5B(9) - Model 5 (27 rows x 132 cols) with
extended attributes
dynamic(10) - Screen size determine with BIND and Read
Partition Query.
In case this LU is not Type 2, then this object
should contain the invalid(1) value."
::= { snaLuAdminEntry 7 }
snaLuAdminTerm OBJECT-TYPE
SYNTAX INTEGER {
unbind (1),
termself (2),
rshutd (3),
poweroff (4)
}
MAX-ACCESS read-create
STATUS current
Kielczewski, Kostick & Shih [Page 39]
RFC 1665 SNANAU MIB July 1994
DESCRIPTION
"This value identifies the desired method for
deactivation of this LU. This value overrides the
default method (snaNodeOperLuTermDefault) for this
Node. For LU 6.2, only the value 'unbind (1)'
applies.
unbind(1) - terminate the LU-LU session by sending
an SNA UNBIND request.
termself(2) - terminate the LU-LU session by sending
an SNA TERM-SELF (Terminate Self) request on
the SSCP-LU session. The SSCP will inform the
remote session LU partner to send an UNBIND
request to terminate the session.
rshutd(3) - terminate the LU-LU session by sending
an SNA RSHUTD (Request ShutDown) request to
the remote session LU partner. The remote LU
will then send an UNBIND request to terminate
the session.
poweroff(4) - terminate the LU-LU session by sending
either an SNA LUSTAT (LU Status) request on
the LU-LU session or an SNA NOTIFY request on
the SSCP-LU session indicating that the LU has
been powered off. Sending both is also
acceptable. The result should be that the
remote session LU partner will send an UNBIND
to terminate the session.
A write operation to this object may immediately
change the operational value reflected
in snaLuOperTerm depending
on the Agent implementation."
::= { snaLuAdminEntry 8 }
snaLuAdminRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object is used by a Management Station to
create or delete the row entry in the
snaLuAdminTable.
To activate a row, the Management Station sets the
value to 'active (1)' or 'notReady (3)'.
Upon successful creation of the row, the Agent
automatically creates a corresponding entry in the
snaLuOperTable with snaLuOperState equal to
'inactive (1)'.
Kielczewski, Kostick & Shih [Page 40]
RFC 1665 SNANAU MIB July 1994
Row deletion can be Management Station or Agent
initiated:
(a) The Management Station can set the value to
'destroy (6)' only when the value of snaLuOperState
of this LU instance is 'inactive (1)'. The Agent will
then delete the row corresponding to this LU
instance from snaLuAdminTable and
from snaLuOperTable.
(b) The Agent detects that a row is in the
'notReady (3)' state for greater than a
default period of 5 minutes.
(c) The Agent will not create a row with RowStatus
equal to 'notReady (3)', after SNA system
re-initialization (e.g., reboot)."
::= { snaLuAdminEntry 9 }
-- ***************************************************************
-- The following table contains LU state dynamic parameters.
-- ***************************************************************
snaLuOperTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaLuOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains dynamic runtime information and
control variables relating to LUs.
Only objects which are common to all types of LUs are
included in this table. This table augments the
snaLuAdminTable."
::= { snaLu 2 }
snaLuOperEntry OBJECT-TYPE
SYNTAX SnaLuOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Contains objects reflecting current information
for an LU.
Each entry is created by the Agent. All entries
have read-only access."
AUGMENTS { snaLuAdminEntry }
::= { snaLuOperTable 1 }
SnaLuOperEntry ::= SEQUENCE {
snaLuOperName
DisplayString,
Kielczewski, Kostick & Shih [Page 41]
RFC 1665 SNANAU MIB July 1994
snaLuOperSnaName
DisplayString,
snaLuOperType
INTEGER,
snaLuOperDepType
INTEGER,
snaLuOperLocalAddress
OCTET STRING,
snaLuOperDisplayModel
INTEGER,
snaLuOperTerm
INTEGER,
snaLuOperState
INTEGER,
snaLuOperSessnCount
Gauge32
}
snaLuOperName OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..48))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"User configurable name for this LU. If a name
is not assigned, then this object contains a
zero length string."
::= { snaLuOperEntry 1 }
snaLuOperSnaName OBJECT-TYPE
SYNTAX DisplayString (SIZE(1..17))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the current SNA LU name."
::= { snaLuOperEntry 2 }
snaLuOperType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
lu0(2),
lu1(3),
lu2(4),
lu3(5),
lu4(6),
lu62(7),
lu7(8)
}
MAX-ACCESS read-only
Kielczewski, Kostick & Shih [Page 42]
RFC 1665 SNANAU MIB July 1994
STATUS current
DESCRIPTION
"The value identifies the current LU type."
::= { snaLuOperEntry 3 }
snaLuOperDepType OBJECT-TYPE
SYNTAX INTEGER {
dependent(1),
independent(2)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies whether the LU is currently
dependent or independent.
A write operation to this object will
not change the operational value reflected
in snaLuOperDepType until the Node has
been re-activated (e.g., after the next
initialization of the SNA services)."
::= { snaLuOperEntry 4 }
snaLuOperLocalAddress OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(1))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The local address for this LU is a byte with a value
ranging from 0 to 254. For dependent LUs, this value
ranges from 1 to 254; for independent LUs this value
is always 0.
A write operation to this object will
not change the operational value reflected
in snaLuOperLocalAddress until the Node has
been re-activated (e.g., after the next
initialization of the SNA services)."
::= { snaLuOperEntry 5 }
snaLuOperDisplayModel OBJECT-TYPE
SYNTAX INTEGER {
invalid(1),
model2A(2),
model2B(3),
model3A(4),
model3B(5),
model4A(6),
Kielczewski, Kostick & Shih [Page 43]
RFC 1665 SNANAU MIB July 1994
model4B(7),
model5A(8),
model5B(9),
dynamic(10)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The screen model type of the terminal connected to
the host. If this LU is not Type 2, then this
object should contain the `invalid(1)' value."
::= { snaLuOperEntry 6 }
snaLuOperTerm OBJECT-TYPE
SYNTAX INTEGER {
unbind (1),
termself (2),
rshutd (3),
poweroff (4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the current method for
deactivation of this LU. This value overrides the
default method (snaNodeOperLuTermDefault) for this
Node. For LU 6.2, only the value 'unbind (1)'
applies.
unbind(1) - terminate the LU-LU session by sending
an SNA UNBIND request.
termself(2) - terminate the LU-LU session by sending
an SNA TERM-SELF (Terminate Self) request on
the SSCP-LU session. The SSCP will inform the
remote session LU partner to send an UNBIND
request to terminate the session.
rshutd(3) - terminate the LU-LU session by sending
an SNA RSHUTD (Request ShutDown) request to
the remote session LU partner. The remote LU
will then send an UNBIND request to terminate
the session.
poweroff(4) - terminate the LU-LU session by sending
either an SNA LUSTAT (LU Status) request on
the LU-LU session or an SNA NOTIFY request on
the SSCP-LU session indicating that the LU has
been powered off. Sending both is also
acceptable. The result should be that the
remote session LU partner will send an UNBIND
Kielczewski, Kostick & Shih [Page 44]
RFC 1665 SNANAU MIB July 1994
to terminate the session."
::= { snaLuOperEntry 7 }
snaLuOperState OBJECT-TYPE
SYNTAX INTEGER {
inactive (1),
active (2)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the current operational state of
this LU. It has different meanings for dependent and
independent LUs.
For dependent LUs the values indicate the following:
inactive (1) - LU didn't receive ACTLU, or
it received DACTLU, or received ACTLU and sent
negative response.
active (2) - LU received ACTLU and acknowledged
positively.
For independent LUs the values indicate the following:
active (2) - the LU is defined and is able to send
and receive BIND.
inactive (1) - the LU has a session count equal
to 0."
::= { snaLuOperEntry 8 }
snaLuOperSessnCount OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of currently active LU-LU sessions of
this LU.
For the independent LU, if this object has value 0,
it indicates that LU is inactive."
::= { snaLuOperEntry 9 }
-- ***************************************************************
-- The following table contains LU-LU session status parameters.
-- ***************************************************************
snaLuSessnTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaLuSessnEntry
MAX-ACCESS not-accessible
STATUS current
Kielczewski, Kostick & Shih [Page 45]
RFC 1665 SNANAU MIB July 1994
DESCRIPTION
"This is a table containing objects which describe the
operational state of LU-LU sessions. Only objects which
are common to all types of LU sessions are included
in this table.
When a session's snaLuSessnOperState value changes to
'pending-bind (2)', then the corresponding entry
in the session table is created by the Agent.
When the session's snaLuSessnOperState value changes to
'unbound (1)', then the session will be removed from
the session table by the Agent."
::= { snaLu 3 }
snaLuSessnEntry OBJECT-TYPE
SYNTAX SnaLuSessnEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry contains dynamic parameters for an LU-LU
session. The indices identify the Node, link and LU
on which this session has been established."
INDEX { snaNodeAdminIndex,
snaNodeLinkAdminIndex,
snaLuAdminLuIndex,
snaLuSessnIndex }
::= { snaLuSessnTable 1 }
SnaLuSessnEntry ::= SEQUENCE {
snaLuSessnIndex
Integer32,
snaLuSessnLocalApplName
DisplayString,
snaLuSessnRemoteLuName
DisplayString,
snaLuSessnMaxSndRuSize
INTEGER,
snaLuSessnMaxRcvRuSize
INTEGER,
snaLuSessnSndPacingSize
INTEGER,
snaLuSessnRcvPacingSize
INTEGER,
snaLuSessnActiveTime
TimeStamp,
snaLuSessnAdminState
INTEGER,
Kielczewski, Kostick & Shih [Page 46]
RFC 1665 SNANAU MIB July 1994
snaLuSessnOperState
INTEGER,
snaLuSessnSenseData
OCTET STRING,
snaLuSessnTerminationRu
INTEGER,
snaLuSessnUnbindType
OCTET STRING
}
snaLuSessnIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value identifies the unique index of the session.
It is recommended that an Agent should not reuse the
index of a deactivated session for a significant
period of time (e.g., one week)."
::= { snaLuSessnEntry 1 }
snaLuSessnLocalApplName OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..48))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The name of the local application using this LU.
If the local application is unknown, then this object
contains a zero length string."
::= { snaLuSessnEntry 2 }
snaLuSessnRemoteLuName OBJECT-TYPE
SYNTAX DisplayString (SIZE(0..17))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"For dependent LUs which are indicated by the
snaLuOperDepType object containing the value
'dependent (1)', this object contains the Primary
LU (PLU) name. For independent LUs,
this object contains the fully-qualified remote LU
name of this 6.2 session.
A fully qualified name is an SNA NAU entity name
preceded by the NetId and a period as the delimiter."
::= { snaLuSessnEntry 3 }
snaLuSessnMaxSndRuSize OBJECT-TYPE
SYNTAX INTEGER (1..8192)
Kielczewski, Kostick & Shih [Page 47]
RFC 1665 SNANAU MIB July 1994
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum RU size used on this session for sending
RUs."
::= { snaLuSessnEntry 4 }
snaLuSessnMaxRcvRuSize OBJECT-TYPE
SYNTAX INTEGER (1..8192)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum RU size used on this session for
receiving RUs."
::= { snaLuSessnEntry 5 }
snaLuSessnSndPacingSize OBJECT-TYPE
SYNTAX INTEGER (1..63)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The size of the send pacing window on this session."
::= { snaLuSessnEntry 6 }
snaLuSessnRcvPacingSize OBJECT-TYPE
SYNTAX INTEGER (1..63)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The size of the receive pacing window on this
session."
::= { snaLuSessnEntry 7 }
snaLuSessnActiveTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The timestamp (e.g., the Agent's sysUpTime value)
when this session becomes active."
::= { snaLuSessnEntry 8 }
snaLuSessnAdminState OBJECT-TYPE
SYNTAX INTEGER {
unbound (1),
bound (3)
}
MAX-ACCESS read-write
Kielczewski, Kostick & Shih [Page 48]
RFC 1665 SNANAU MIB July 1994
STATUS current
DESCRIPTION
"The value indicates the desired operational state of
the session. This object is used to
change the operational state of the session.
A Management Station can only change the operational
state of the session to `unbound (1)'.
Session deactivation:
If a session is in the operational state
`bound (3)' then setting the value of this
object to 'unbound (1)' will initiate the
session shutdown.
If a session is in the operational state
`pending-bind (2)' then setting the value of this
object to 'unbound (1)' will initiate the session
shutdown.
If a session is in the operational state
`pending-unbind (4)' for an abnormally long period
of time (e.g., three minutes) then setting the value
of this object to 'unbound (1)' will change the
session operational state to 'unbound (1)'.
Note: for dependent LUs, deactivating the session is
the same as deactivating the LU."
::= { snaLuSessnEntry 9 }
snaLuSessnOperState OBJECT-TYPE
SYNTAX INTEGER {
unbound (1),
pending-bind (2),
bound (3),
pending-unbind (4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value indicates the current operational state of
the session.
'unbound (1)' - session has been unbound;
in this state it will be removed from the
session table by the Agent.
'pending-bind (2)' - this state has different
meanings for dependent and independent LUs;
for dependent LU - waiting for BIND from
the host, for independent LU - waiting for
Kielczewski, Kostick & Shih [Page 49]
RFC 1665 SNANAU MIB July 1994
BIND response. When a session enters this
state, the corresponding entry in the
session table is created by the Agent.
'bound (3)' - session has been successfully bound.
'pending-unbind (4)' - session enters this state
when an UNBIND is sent and before the
rsp(UNBIND) is received."
::= { snaLuSessnEntry 10 }
snaLuSessnSenseData OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(0..8))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the sense code when there is
a BIND failure. It is taken from the negative BIND
response or UNBIND request.
This is displayed as 8 hexadecimal digits."
::= { snaLuSessnEntry 11 }
snaLuSessnTerminationRu OBJECT-TYPE
SYNTAX INTEGER {
other (1),
bind-failure (2),
unbind (3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value identifies the SNA RU that terminated the
session. If the session is not in the unbound state,
this object has a value of 'other (1)'."
::= { snaLuSessnEntry 12 }
snaLuSessnUnbindType OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(0..1))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"If the session is in the unbound state, and it was
terminated by an UNBIND, then this object contains
the UNBIND type value (byte 1 of the UNBIND RU);
otherwise the string is null."
::= { snaLuSessnEntry 13 }
Kielczewski, Kostick & Shih [Page 50]
RFC 1665 SNANAU MIB July 1994
-- ***************************************************************
-- The following table contains LU sessions statistics dynamic
-- parameters.
-- ***************************************************************
snaLuSessnStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaLuSessnStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains dynamic statistics information
relating to LU sessions.
The entries in this table augment the entries in
the snaLuSessnTable and cannot be created by
a Management Station."
::= { snaLu 4 }
snaLuSessnStatsEntry OBJECT-TYPE
SYNTAX SnaLuSessnStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Contains statistics information for an LU session.
Each entry is created by the Agent.
Objects in this table have read-only access.
Each session from snaLuSessnTable
has one entry in this table."
AUGMENTS { snaLuSessnEntry }
::= { snaLuSessnStatsTable 1 }
SnaLuSessnStatsEntry ::= SEQUENCE {
snaLuSessnStatsSentBytes
Counter32,
snaLuSessnStatsReceivedBytes
Counter32,
snaLuSessnStatsSentRus
Counter32,
snaLuSessnStatsReceivedRus
Counter32,
snaLuSessnStatsSentNegativeResps
Counter32,
snaLuSessnStatsReceivedNegativeResps
Counter32
}
snaLuSessnStatsSentBytes OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
Kielczewski, Kostick & Shih [Page 51]
RFC 1665 SNANAU MIB July 1994
STATUS current
DESCRIPTION
"The number of bytes sent by the local LU."
::= { snaLuSessnStatsEntry 1 }
snaLuSessnStatsReceivedBytes OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of bytes received by the local LU."
::= { snaLuSessnStatsEntry 2 }
snaLuSessnStatsSentRus OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RUs sent by the local LU."
::= { snaLuSessnStatsEntry 3 }
snaLuSessnStatsReceivedRus OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RUs received by the local LU."
::= { snaLuSessnStatsEntry 4 }
snaLuSessnStatsSentNegativeResps OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of negative responses sent by the
local LU."
::= { snaLuSessnStatsEntry 5 }
snaLuSessnStatsReceivedNegativeResps OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of negative responses received by the
local LU."
::= { snaLuSessnStatsEntry 6 }
Kielczewski, Kostick & Shih [Page 52]
RFC 1665 SNANAU MIB July 1994
-- ***************************************************************
-- Traps
-- ***************************************************************
snaLuTraps OBJECT IDENTIFIER ::= { snaLu 5 }
snaLuStateChangeTrap NOTIFICATION-TYPE
OBJECTS { snaLuOperName,
snaLuOperSnaName,
snaLuOperState }
STATUS current
DESCRIPTION
"This trap indicates that the operational state
(i.e., snaLuOperState value) of the LU has changed.
The value of snaLuOperName indicates the name of the LU.
The value of snaLuOperSnaName indicates the SNA name
of LU. The value of snaLuOperState indicates the
current state after change."
::= { snaLuTraps 1 }
snaLuSessnBindFailTrap NOTIFICATION-TYPE
OBJECTS { snaLuSessnLocalApplName,
snaLuSessnRemoteLuName,
snaLuSessnOperState,
snaLuSessnSenseData }
STATUS current
DESCRIPTION
"This trap indicates the failure of a BIND.
The value of snaLuSessnLocalApplName indicates the local
application name.
The value of snaLuSessnPartnerName indicates the partner
name.
The value of snaLuSessnOperState indicates the current
state after change.
The value of snaLuSessnBindFailureReason
indicates the failure reason.
The Agent should not generate more than 1 trap of this
type per minute to minimize the level of management
traffic on the network."
::= { snaLuTraps 2 }
-- ***************************************************************
-- snaMgtTools group
--
-- Currently this group contains only one table.
-- ***************************************************************
Kielczewski, Kostick & Shih [Page 53]
RFC 1665 SNANAU MIB July 1994
-- ***************************************************************
-- The following table contains Response Time Monitoring (RTM)
-- configuration information and statistics for LU Type 2s.
-- RTM supports the capability to measure and report end-user
-- response times for dependent LUs. When the RTM state of an LU
-- is 'on', response times for each LU transaction are monitored.
-- A set of ranges is defined (e.g., Range 1 includes the number of
-- transactions with response times less than 1 second) using the
-- "boundary" definitions (e.g., boundary #2 is defined as 3 seconds).
-- A set of counters (one per range) identifies
-- the number of transactions within each response time range.
-- ***************************************************************
snaLuRtmTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnaLuRtmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains Response Time Monitoring (RTM)
information relating to an LU (Type 2). Each entry
corresponds to an LU 2 entry in
snaLuAdminTable."
::= { snaMgtTools 1 }
snaLuRtmEntry OBJECT-TYPE
SYNTAX SnaLuRtmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Contains RTM information for an LU (Type 2).
Each entry is created by the Agent."
INDEX { snaLuRtmPuIndex, snaLuRtmLuIndex }
::= { snaLuRtmTable 1 }
SnaLuRtmEntry ::= SEQUENCE {
snaLuRtmPuIndex
Integer32,
snaLuRtmLuIndex
Integer32,
snaLuRtmState
INTEGER,
snaLuRtmStateTime
TimeStamp,
snaLuRtmDef
INTEGER,
snaLuRtmBoundary1
Integer32,
snaLuRtmBoundary2
Kielczewski, Kostick & Shih [Page 54]
RFC 1665 SNANAU MIB July 1994
Integer32,
snaLuRtmBoundary3
Integer32,
snaLuRtmBoundary4
Integer32,
snaLuRtmCounter1
Counter32,
snaLuRtmCounter2
Counter32,
snaLuRtmCounter3
Counter32,
snaLuRtmCounter4
Counter32,
snaLuRtmOverFlows
Counter32,
snaLuRtmObjPercent
Integer32,
snaLuRtmObjRange
INTEGER,
snaLuRtmNumTrans
Integer32,
snaLuRtmLastRspTime
Integer32,
snaLuRtmAvgRspTime
Integer32
}
snaLuRtmPuIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The value identifies the PU 2.0 with which this LU is
associated."
::= { snaLuRtmEntry 1 }
snaLuRtmLuIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The value uniquely identifies an LU in a PU 2.0."
::= { snaLuRtmEntry 2 }
snaLuRtmState OBJECT-TYPE
SYNTAX INTEGER {
off(1),
on(2)
Kielczewski, Kostick & Shih [Page 55]
RFC 1665 SNANAU MIB July 1994
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value indicates the current RTM state of an LU."
::= { snaLuRtmEntry 3 }
snaLuRtmStateTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The timestamp (e.g., the Agent's sysUpTime value)
when this session's RTM state (e.g., snaLuRtmState)
changes value."
::= { snaLuRtmEntry 4 }
snaLuRtmDef OBJECT-TYPE
SYNTAX INTEGER {
firstChar(1),
kb(2),
cdeb(3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value indicates the mode of measurement for this
RTM request. The values have following meaning:
firstChar(1) - time to first character on screen
kb(2) - time to keyboard usable by operator
cdeb(3) - time to Change Direction/End Bracket."
::= { snaLuRtmEntry 5 }
snaLuRtmBoundary1 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the value of the first boundary
in units of 1/10th of a second."
::= { snaLuRtmEntry 6 }
snaLuRtmBoundary2 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the value of the second boundary
Kielczewski, Kostick & Shih [Page 56]
RFC 1665 SNANAU MIB July 1994
in units of 1/10th of a second."
::= { snaLuRtmEntry 7 }
snaLuRtmBoundary3 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the value of the third boundary
in units of 1/10th of a second."
::= { snaLuRtmEntry 8 }
snaLuRtmBoundary4 OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the value of the fourth boundary
in units of 1/10th of a second."
::= { snaLuRtmEntry 9 }
snaLuRtmCounter1 OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the number of transactions which
fall in the range specified by the first boundary."
::= { snaLuRtmEntry 10 }
snaLuRtmCounter2 OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the number of transactions which
fall in the range specified by the second boundary."
::= { snaLuRtmEntry 11 }
snaLuRtmCounter3 OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the number of transactions which
fall in the range specified by the third boundary."
::= { snaLuRtmEntry 12 }
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RFC 1665 SNANAU MIB July 1994
snaLuRtmCounter4 OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the number of transactions which
fall in the range specified by the fourth boundary."
::= { snaLuRtmEntry 13 }
snaLuRtmOverFlows OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the number of transactions which
exceed the highest range specified by the
boundaries."
::= { snaLuRtmEntry 14 }
snaLuRtmObjPercent OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the desired percentage of
transactions which should be under a designated
boundary range indicated by snaLuRtmObjRange."
::= { snaLuRtmEntry 15 }
snaLuRtmObjRange OBJECT-TYPE
SYNTAX INTEGER {
other(1),
range1(2),
range2(3),
range3(4),
range4(5),
range5(6)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the designated boundary range to
which the snaLuRtmObject refers.
The values have the following meanings:
other(1) - not specified
range1(2) - less than boundary 1
range2(3) - between boundary 1 and 2
range3(4) - between boundary 2 and 3
Kielczewski, Kostick & Shih [Page 58]
RFC 1665 SNANAU MIB July 1994
range4(5) - between boundary 3 and 4
range5(6) - greater than boundary 4."
::= { snaLuRtmEntry 16 }
snaLuRtmNumTrans OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the total number of transactions
executed since the RTM monitoring began (i.e.,
snaLuRtmState
changed to `on(2)') for this LU."
::= { snaLuRtmEntry 17 }
snaLuRtmLastRspTime OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the response time for the last
transaction in units of 1/10th of a second."
::= { snaLuRtmEntry 18 }
snaLuRtmAvgRspTime OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value indicates the average response time for all
transactions in units of 1/10th of a second."
::= { snaLuRtmEntry 19 }
-- ***************************************************************
-- Conformance information
-- ***************************************************************
snanauConformance OBJECT IDENTIFIER ::= { snanauMIB 2 }
snanauCompliances OBJECT IDENTIFIER ::= {snanauConformance 1 }
snanauGroups OBJECT IDENTIFIER ::= {snanauConformance 2 }
-- Compliance statements
snanauCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
Kielczewski, Kostick & Shih [Page 59]
RFC 1665 SNANAU MIB July 1994
"The compliance statement for the SNMPv2 entities
which implement the snanau MIB."
MODULE -- this module
-- Unconditionally mandatory groups
MANDATORY-GROUPS { snaNodeGroup,
snaLuGroup,
snaSessionGroup }
-- Conditionally mandatory groups
GROUP snaPu20Group
DESCRIPTION
"The snaPu20Group is mandatory only for those
entities which implement PU type 2.0"
GROUP snaMgtToolsRtmGroup
DESCRIPTION
"The snaMgtToolsGroup is mandatory only for
those entities which implement LU type 2
and RTM."
-- Refinement of requirements for objects access.
-- The Agent which does not implement row creation for
-- snaNodeAdminTable, snaNodeLinkAdminTable and
-- snaLuAdminTable must at least accept
-- objects modification (read-write access instead of
-- read-create).
OBJECT snaNodeAdminName
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminType
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminXidFormat
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminBlockNum
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RFC 1665 SNANAU MIB July 1994
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminIdNum
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminEnablingMethod
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminLuTermDefault
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminMaxLu
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminHostDescription
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminStopMethod
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeAdminState
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeLinkAdminSpecific
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RFC 1665 SNANAU MIB July 1994
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaNodeLinkAdminMaxPiu
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaLuAdminName
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaLuAdminSnaName
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaLuAdminType
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaLuAdminDepType
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaLuAdminLocalAddress
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaLuAdminDisplayModel
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
OBJECT snaLuAdminTerm
Kielczewski, Kostick & Shih [Page 62]
RFC 1665 SNANAU MIB July 1994
MIN-ACCESS read-write
DESCRIPTION
"An Agent is required to implement read-write
access to this object."
::= {snanauCompliances 1 }
-- Units of conformance
snaNodeGroup OBJECT-GROUP
OBJECTS {snaNodeAdminIndex,
snaNodeAdminName,
snaNodeAdminType,
snaNodeAdminXidFormat,
snaNodeAdminBlockNum,
snaNodeAdminIdNum,
snaNodeAdminEnablingMethod,
snaNodeAdminLuTermDefault,
snaNodeAdminMaxLu,
snaNodeAdminHostDescription,
snaNodeAdminStopMethod,
snaNodeAdminState,
snaNodeAdminRowStatus,
snaNodeAdminTableLastChange,
snaNodeOperName,
snaNodeOperType,
snaNodeOperXidFormat,
snaNodeOperBlockNum,
snaNodeOperIdNum,
snaNodeOperEnablingMethod,
snaNodeOperLuTermDefault,
snaNodeOperMaxLu,
snaNodeOperHostDescription,
snaNodeOperStopMethod,
snaNodeOperState,
snaNodeOperHostSscpId,
snaNodeOperStartTime,
snaNodeOperLastStateChange,
snaNodeOperActFailures,
snaNodeOperActFailureReason,
snaNodeOperTableLastChange,
snaNodeLinkAdminIndex,
snaNodeLinkAdminSpecific,
snaNodeLinkAdminMaxPiu,
snaNodeLinkAdminRowStatus,
snaNodeLinkAdminTableLastChange,
snaNodeLinkOperSpecific,
Kielczewski, Kostick & Shih [Page 63]
RFC 1665 SNANAU MIB July 1994
snaNodeLinkOperMaxPiu,
snaNodeLinkOperTableLastChange }
STATUS current
DESCRIPTION
"A collection of objects providing the
instrumentation of SNA nodes."
::= { snanauGroups 1 }
snaLuGroup OBJECT-GROUP
OBJECTS { snaLuAdminLuIndex,
snaLuAdminName,
snaLuAdminSnaName,
snaLuAdminType,
snaLuAdminDepType,
snaLuAdminLocalAddress,
snaLuAdminDisplayModel,
snaLuAdminTerm,
snaLuAdminRowStatus,
snaLuOperName,
snaLuOperSnaName,
snaLuOperType,
snaLuOperDepType,
snaLuOperLocalAddress,
snaLuOperDisplayModel,
snaLuOperTerm,
snaLuOperState,
snaLuOperSessnCount }
STATUS current
DESCRIPTION
"A collection of objects providing the
instrumentation of SNA LUs."
::= { snanauGroups 2 }
snaSessionGroup OBJECT-GROUP
OBJECTS { snaLuSessnIndex,
snaLuSessnLocalApplName,
snaLuSessnRemoteLuName,
snaLuSessnMaxSndRuSize,
snaLuSessnMaxRcvRuSize,
snaLuSessnSndPacingSize,
snaLuSessnRcvPacingSize,
snaLuSessnActiveTime,
snaLuSessnAdminState,
snaLuSessnOperState,
snaLuSessnSenseData,
snaLuSessnTerminationRu,
snaLuSessnUnbindType,
snaLuSessnStatsSentBytes,
Kielczewski, Kostick & Shih [Page 64]
RFC 1665 SNANAU MIB July 1994
snaLuSessnStatsReceivedBytes,
snaLuSessnStatsSentRus,
snaLuSessnStatsReceivedRus,
snaLuSessnStatsSentNegativeResps,
snaLuSessnStatsReceivedNegativeResps }
STATUS current
DESCRIPTION
"A collection of objects providing the
instrumentation of SNA sessions."
::= { snanauGroups 3 }
snaPu20Group OBJECT-GROUP
OBJECTS { snaPu20StatsSentBytes,
snaPu20StatsReceivedBytes,
snaPu20StatsSentPius,
snaPu20StatsReceivedPius,
snaPu20StatsSentNegativeResps,
snaPu20StatsReceivedNegativeResps,
snaPu20StatsActLus,
snaPu20StatsInActLus,
snaPu20StatsBindLus }
STATUS current
DESCRIPTION
"A collection of objects providing the
instrumentation of PU 2.0."
::= { snanauGroups 4 }
snaMgtToolsRtmGroup OBJECT-GROUP
OBJECTS { snaLuRtmPuIndex,
snaLuRtmLuIndex,
snaLuRtmState,
snaLuRtmStateTime,
snaLuRtmDef,
snaLuRtmBoundary1,
snaLuRtmBoundary2,
snaLuRtmBoundary3,
snaLuRtmBoundary4,
snaLuRtmCounter1,
snaLuRtmCounter2,
snaLuRtmCounter3,
snaLuRtmCounter4,
snaLuRtmOverFlows,
snaLuRtmObjPercent,
snaLuRtmObjRange,
snaLuRtmNumTrans,
snaLuRtmLastRspTime,
snaLuRtmAvgRspTime }
STATUS current
Kielczewski, Kostick & Shih [Page 65]
RFC 1665 SNANAU MIB July 1994
DESCRIPTION
"A collection of objects providing the
instrumentation of RTM for SNA LU 2.0."
::= { snanauGroups 5 }
-- end of conformance statement
END
5. Acknowledgments
The following people greatly contributed to the work on this MIB
document: Michael Allen, Robin Cheng, Bill Kwan. Special thanks goes
to Dave Perkins for his assistance in reviewing this MIB proposal.
6. References
[1] IBM, Systems Network Architecture Technical Overview, GC 30-
3073-3, March, 1991.
[2] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure
of Management Information for version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1442, SNMP Research, Inc.,
Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon
University, April 1993.
[3] McCloghrie, K., and M. Rose, "Management Information Base for
Network Management of TCP/IP-based internets - MIB-II", STD 17,
RFC 1213, Hughes LAN Systems, Performance Systems International,
March 1991.
[4] Galvin, J., and K. McCloghrie, "Administrative Model for version
2 of the Simple Network Management Protocol (SNMPv2)", RFC 1445,
Trusted Information Systems, Hughes LAN Systems, April 1993.
[5] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
Operations for version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC 1448, SNMP Research, Inc., Hughes LAN
Systems, Dover Beach Consulting, Inc., Carnegie Mellon
University, April 1993.
[6] Hilgeman, J., Nix, S., Bartky, A., Clark, W., "Definitions of
Managed Objects for SNA Data Link Control: SDLC", Work in
Progress.
Kielczewski, Kostick & Shih [Page 66]
RFC 1665 SNANAU MIB July 1994
[7] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Textual
Conventions for version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC 1443, SNMP Research, Inc., Hughes LAN
Systems, Dover Beach Consulting, Inc., Carnegie Mellon
University, April 1993.
7. Security Considerations
Security issues are not discussed in this memo.
8. Authors' Addresses
Zbigniew Kielczewski
Eicon Technology Corporation
2196 32nd Avenue
Montreal, Quebec, Canada H8T 3H7
Phone: 1 514 631 2592
EMail: zbig@eicon.qc.ca
Deirdre Kostick
Bell Communications Research
Red Bank, NJ 07701
Phone: 1 908 758 2642
EMail: dck2@mail.bellcore.com
Kitty Shih
Novell
890 Ross Drive
Sunnyvale, CA 94089
Phone: 1 408 747 4305
EMail: kmshih@novell.com
Kielczewski, Kostick & Shih [Page 67]