Internet Draft Manager-to-Manager MIB November 1994
Manager-to-Manager
Management Information Base
1 November 1994
Jeffrey D. Case
SNMP Research, Inc.
case@snmp.com
Keith McCloghrie
Cisco Systems, Inc.
kzm@cisco.com
Marshall T. Rose
Dover Beach Consulting, Inc.
mrose@dbc.mtview.ca.us
Steven Waldbusser
Carnegie Mellon University
waldbusser@cmu.edu
<draft-ietf-snmpv2-m2m-ds-00.txt>
Status of this Memo
This document is an Internet-Draft. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its areas, and
its working groups. Note that other groups may also distribute working
documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet- Drafts as reference material
or to cite them other than as ``work in progress.''
To learn the current status of any Internet-Draft, please check the
``1id-abstracts.txt'' listing contained in the Internet- Drafts Shadow
Directories on ds.internic.net (US East Coast), nic.nordu.net (Europe),
ftp.isi.edu (US West Coast), or munnari.oz.au (Pacific Rim).
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1. Introduction
A management system contains: several (potentially many) nodes, each
with a processing entity, termed an agent, which has access to
management instrumentation; at least one management station; and, a
management protocol, used to convey management information between the
agents and management stations. Operations of the protocol are carried
out under an administrative framework which defines authentication,
authorization, access control, and privacy policies.
Management stations execute management applications which monitor and
control managed elements. Managed elements are devices such as hosts,
routers, terminal servers, etc., which are monitored and controlled via
access to their management information.
Management information is viewed as a collection of managed objects,
residing in a virtual information store, termed the Management
Information Base (MIB). Collections of related objects are defined in
MIB modules. These modules are written using a subset of OSI's Abstract
Syntax Notation One (ASN.1) [1], termed the Structure of Management
Information (SMI) [2].
The management protocol, version 2 of the Simple Network Management
Protocol [3], provides for the exchange of messages which convey
management information between the agents and the management stations,
including between management stations. It is the purpose of this
document to define managed objects which describe the behavior of a
SNMPv2 entity acting in both a manager role and an agent role.
1.1. A Note on Terminology
For the purpose of exposition, the original Internet-standard Network
Management Framework, as described in RFCs 1155, 1157, and 1212, is
termed the SNMP version 1 framework (SNMPv1). The current framework is
termed the SNMP version 2 framework (SNMPv2).
1.2. Change Log
For the 1 November version:
- recast RFC 1451 into an Internet-Draft,
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- fixed typos,
- added a description of how source and destination parties are
chosen for sending notifications,
- reworded descriptions of notifications so that a context is not
depicted as the "destination" of a notification,
- added note that management stations are not obligated to use a
retrieved value of snmpAlarmNextIndex to create an entry in the
snmpAlarmTable.
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2. Overview
The purpose of this MIB is to provide the means for coordination between
multiple management stations. That is, the means by which the
controlling and monitoring functions of network management can be
distributed amongst multiple management stations. Such distribution
facilitates the scaling of network management solutions based on the
SNMPv2 to meet the needs of very large networks, or of networks composed
of multiple interconnected administrations. Specifically, this MIB
provides the means for one management station to request management
services from another management station.
2.1. A SNMPv2 Entity Acting in a Dual Role
A management station providing services to other management station(s),
is a SNMPv2 entity which acts in the dual role of both manager and
agent; the requests for service are received through acting in an agent
role (with respect to the managed objects defined in this MIB), and the
requested services are performed through acting in a manager role.
2.2. Alarms, Events, and Notifications
In this initial version, this MIB defines the concepts of "alarms",
"events", and "notifications". Each alarm is a specific condition
detected through the periodic (at a configured sampling interval)
monitoring of the value of a specific management information variable.
An example of an alarm condition is when the monitored variable falls
outside a configured range. Each alarm condition triggers an event, and
each event can cause (one or more) notifications to be reported to other
management stations using the Inform-Request PDU.
Specifically, this MIB defines three MIB tables and a number of scalar
objects. The three tables are: the Alarm Table, the Event Table, and
the Notification Table.
2.3. Destinations of Inform-Request PDUs
An entry in the Notification Table identifies a context for which an
Inform-Request PDU will be sent for a particular event. The
destination(s) to which the Inform-Request PDU is sent is determined by
inspection of the aclTable [5], to find all entries which satisfy the
following criteria:
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(1) the value of aclSubject refers to a local party,
(2) the value of aclPrivileges allows for the Inform-Request PDU,
(3) the value of aclResources is the context specified by the entry in
the Notification Table,
Then, for each entry satisfying these conditions, an Inform-Request PDU
is sent from aclSubject with context aclResources to aclTarget. The
variable bindings of the Inform-Request PDU are as specified in section
4.2.7 of [3].
2.4. Access Control
The Administrative Model for SNMPv2 document [4] includes an access
control model, which must not be subverted by allowing access to
management information variables via the Alarm table. That is, access
to a monitored variable via the Alarm table must be controlled according
to the identity of the management station accessing the particular entry
in the Alarm table.
An entry in the Alarm table provides the means to configure the sampling
of the value of a MIB variable in the MIB view associated with the
specified context (which can refer to object resources that are either
local or remote). The sampling is done by (conceptually or actually)
issuing a SNMPv2 request to retrieve the variable's value. This request
is authenticated and/or protected from disclosure according to a source
party and a destination party pair which has access to the indicated
context.
Thus, to provide the required access control, the initial MIB view
assigned to any context that includes the snmpAlarmTable, must, by
default, include the view component:
viewSubtree = { snmpAlarm }
viewStatus = { excluded }
viewMask = { ''H }
Then, the MIB view associated with the context, requestContext,
accessible by a requesting management station, can be configured to
include specific Alarm table entries -- the ones associated with those
contexts to which the requesting management station has access.
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In particular, to provide a requestContext with access to the sampling
context sampleContext, the following family of view subtrees would be
included for the requestContext on the SNMPv2 entity acting in a dual
role:
{ snmpAlarmEntry WILDCARD sampleContext }
Which would be configured in the party MIB [5] as:
contextIdentity = { requestContext }
contextViewIndex = { ViewIndex }
viewIndex = { ViewIndex }
viewSubtree = { snmpAlarmEntry 0 sampleContext }
viewStatus = { included }
viewMask = { 'FFEF'H } -- specifies wildcard for column
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3. Definitions
SNMPv2-M2M-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
Integer32, Counter32, snmpModules
FROM SNMPv2-SMI
DisplayString, InstancePointer, RowStatus, TimeStamp
FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF
contextIdentity
FROM SNMPv2-PARTY-MIB;
snmpM2M MODULE-IDENTITY
LAST-UPDATED "9411010000Z"
ORGANIZATION "IETF SNMPv2 Working Group"
CONTACT-INFO
" Steven Waldbusser
Postal: Carnegie Mellon University
5000 Forbes Ave
Pittsburgh, PA 15213
USA
Tel: +1 412 268 6628
Fax: +1 412 268 4987
E-mail: waldbusser@cmu.edu"
DESCRIPTION
"The Manager-to-Manager MIB module."
::= { snmpModules 2 }
snmpM2MObjects OBJECT IDENTIFIER ::= { snmpM2M 1 }
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-- the alarm group
--
-- a collection of objects allowing the description and
-- configuration of threshold alarms from a SNMPv2 entity
-- acting in a dual role.
snmpAlarm OBJECT IDENTIFIER ::= { snmpM2MObjects 1 }
-- This Alarm mechanism periodically takes statistical samples
-- from variables available via SNMPv2 and compares them to
-- thresholds that have been configured. The alarm table
-- stores configuration entries that each define a variable,
-- polling period, and threshold parameters. If a sample is
-- found to cross the threshold values, an event is generated.
-- Only variables that resolve to an ASN.1 primitive type of
-- INTEGER (Integer32, Counter32, Gauge32, TimeTicks,
-- Counter64, or UInteger32) may be monitored in this way.
--
-- This function has a hysteresis mechanism to limit the
-- generation of events. This mechanism generates one event
-- as a threshold is crossed in the appropriate direction. No
-- more events are generated for that threshold until the
-- opposite threshold is crossed.
--
-- In the case of sampling a deltaValue, an entity may
-- implement this mechanism with more precision if it takes a
-- delta sample twice per period, each time comparing the sum
-- of the latest two samples to the threshold. This allows
-- the detection of threshold crossings that span the sampling
-- boundary. Note that this does not require any special
-- configuration of the threshold value. It is suggested that
-- entities implement this more precise algorithm.
--
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snmpAlarmNextIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index number of the next appropriate unassigned entry
in the snmpAlarmTable. The value 0 indicates that no
unassigned entries are available.
A management station should create new entries in the
snmpAlarmTable using this algorithm: first, issue a
management protocol retrieval operation to determine the
value of snmpAlarmNextIndex; and, second, issue a management
protocol set operation to create an instance of the
snmpAlarmStatus object setting its value to `createAndGo' or
`createAndWait' (as specified in the description of the
RowStatus textual convention).
A management station which retrieves the value of
snmpAlarmNextIndex is under no obligation to use that value
to create a new entry in the snmpAlarmTable."
::= { snmpAlarm 1 }
snmpAlarmTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of snmpAlarm entries."
::= { snmpAlarm 2 }
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snmpAlarmEntry OBJECT-TYPE
SYNTAX SnmpAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of parameters that set up a periodic sampling query
to check for alarm conditions. The contextIdentity included
in the INDEX clause is the context to which the sampling
queries are directed."
INDEX { contextIdentity, snmpAlarmIndex }
::= { snmpAlarmTable 1 }
SnmpAlarmEntry ::= SEQUENCE {
snmpAlarmIndex INTEGER,
snmpAlarmVariable InstancePointer,
snmpAlarmInterval Integer32,
snmpAlarmSampleType INTEGER,
snmpAlarmValue Integer32,
snmpAlarmStartupAlarm INTEGER,
snmpAlarmRisingThreshold Integer32,
snmpAlarmFallingThreshold Integer32,
snmpAlarmRisingEventIndex INTEGER,
snmpAlarmFallingEventIndex INTEGER,
snmpAlarmUnavailableEventIndex INTEGER,
snmpAlarmStatus RowStatus
}
snmpAlarmIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry in the snmpAlarm
table for a particular sampling context. Each such entry
defines a diagnostic sample at a particular interval for a
variable in the particular context's object resources."
::= { snmpAlarmEntry 1 }
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snmpAlarmVariable OBJECT-TYPE
SYNTAX InstancePointer
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The object identifier of the particular variable to be
sampled. Only variables that resolve to an ASN.1 primitive
type of INTEGER (Integer32, Counter32, Gauge32, TimeTicks,
Counter64, or UInteger32) may be sampled.
If it is detected by an error response of
authorizationError, noSuchObject, or noSuchInstance that the
variable name of an established snmpAlarmEntry is no longer
available in the sampling context, a single
snmpObjectUnavailableAlarm event is generated and the status
of this snmpAlarmEntry is set to `destroy'. Likewise, if
the syntax of the variable retrieved by the query is not
Integer32, Counter32, Gauge32, TimeTicks, Counter64, or
UInteger32, the same actions will be taken.
If the SNMPv2 entity acting in a dual role detects that the
sampled value can not be obtained due to lack of response to
management queries, it should either:
1) Set the status of this snmpAlarmEntry to `destroy',
if it is determined that further communication is not
possible;
or,
2) Delete the associated snmpAlarmValue instance (but
not the entire conceptual row), and continue to attempt
to sample the variable and recreate the associated
snmpAlarmValue instance should communication be
reestablished.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
::= { snmpAlarmEntry 2 }
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snmpAlarmInterval OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The interval in seconds over which the data is sampled and
compared with the rising and falling thresholds. When
setting this object and the sampling type is `deltaValue',
care should be taken to ensure that the change during this
interval of the variable being sampled will not exceed the
(-2^31...2^31-1) range of the snmpAlarmValue.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
::= { snmpAlarmEntry 3 }
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snmpAlarmSampleType OBJECT-TYPE
SYNTAX INTEGER {
absoluteValue(1),
deltaValue(2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The method of sampling the selected variable and
calculating the value to be compared against the thresholds.
If the value of this object is `absoluteValue', the value of
the selected variable at the end of the sampling interval
will be compared directly with both the
snmpAlarmRisingThreshold and the snmpAlarmFallingThreshold
values. If the value of this object is `deltaValue', the
value of the selected variable at the end of the sampling
interval will be subtracted from its value at the end of the
previous sampling interval, and the difference compared with
both the snmpAlarmRisingThreshold and the
snmpAlarmFallingThreshold values.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
DEFVAL { deltaValue }
::= { snmpAlarmEntry 4 }
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snmpAlarmValue OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of the statistic during the last sampling period.
The value during the current sampling period is not made
available until the period is completed. If the value of
the statistic does not fit in the signed 32 bit
representation of this object, it should be truncated in an
implementation specific manner.
Note that if the associated snmpAlarmSampleType is set to
`deltaValue', the value of this object is the difference in
the sampled variable since the last sample.
This object will be created by the SNMPv2 entity acting in a
dual role when this entry is set to `active', and the first
sampling period has completed. It may be created and
deleted at other times by the SNMPv2 entity acting in a dual
role when the sampled value can not be obtained, as
specified in the snmpAlarmVariable object."
::= { snmpAlarmEntry 5 }
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snmpAlarmStartupAlarm OBJECT-TYPE
SYNTAX INTEGER {
risingAlarm(1),
fallingAlarm(2),
risingOrFallingAlarm(3)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The alarm that may be sent when this entry is first set to
`active'. If the first sample after this entry becomes
active is greater than or equal to the risingThreshold and
snmpAlarmStartupAlarm is equal to `risingAlarm' or
`risingOrFallingAlarm', then a single rising alarm will be
generated. If the first sample after this entry becomes
active is less than or equal to the fallingThreshold and
snmpAlarmStartupAlarm is equal to `fallingAlarm' or
`risingOrFallingAlarm', then a single falling alarm will be
generated. Note that a snmpObjectUnavailableAlarm is sent
upon startup whenever it is applicable, independent of the
setting of snmpAlarmStartupAlarm.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
DEFVAL { risingOrFallingAlarm }
::= { snmpAlarmEntry 6 }
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snmpAlarmRisingThreshold OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A threshold for the sampled statistic. When the current
sampled value is greater than or equal to this threshold,
and the value at the last sampling interval was less than
this threshold, a single event will be generated. A single
event will also be generated if the first sample after this
entry becomes active is greater than or equal to this
threshold and the associated snmpAlarmStartupAlarm is equal
to `risingAlarm' or `risingOrFallingAlarm'.
After a rising event is generated, another such event will
not be generated until the sampled value falls below this
threshold and reaches the snmpAlarmFallingThreshold.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
::= { snmpAlarmEntry 7 }
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snmpAlarmFallingThreshold OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A threshold for the sampled statistic. When the current
sampled value is less than or equal to this threshold, and
the value at the last sampling interval was greater than
this threshold, a single event will be generated. A single
event will also be generated if the first sample after this
entry becomes active is less than or equal to this threshold
and the associated snmpAlarmStartupAlarm is equal to
`fallingAlarm' or `risingOrFallingAlarm'.
After a falling event is generated, another such event will
not be generated until the sampled value rises above this
threshold and reaches the snmpAlarmRisingThreshold.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
::= { snmpAlarmEntry 8 }
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snmpAlarmRisingEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The index of the snmpEventEntry that is used when a rising
threshold is crossed. The snmpEventEntry identified by a
particular value of this index is the same as identified by
the same value of the snmpEventIndex object. If there is no
corresponding entry in the snmpEventTable, then no
association exists. In particular, if this value is zero,
no associated event will be generated, as zero is not a
valid snmpEventIndex.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
::= { snmpAlarmEntry 9 }
snmpAlarmFallingEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The index of the snmpEventEntry that is used when a falling
threshold is crossed. The snmpEventEntry identified by a
particular value of this index is the same as identified by
the same value of the snmpEventIndex object. If there is no
corresponding entry in the snmpEventTable, then no
association exists. In particular, if this value is zero,
no associated event will be generated, as zero is not a
valid snmpEventIndex.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
::= { snmpAlarmEntry 10 }
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snmpAlarmUnavailableEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The index of the snmpEventEntry that is used when a
variable becomes unavailable. The snmpEventEntry identified
by a particular value of this index is the same as
identified by the same value of the snmpEventIndex object.
If there is no corresponding entry in the snmpEventTable,
then no association exists. In particular, if this value is
zero, no associated event will be generated, as zero is not
a valid snmpEventIndex.
An attempt to modify this object will fail with an
`inconsistentValue' error if the associated snmpAlarmStatus
object would be equal to `active' both before and after the
modification attempt."
::= { snmpAlarmEntry 11 }
snmpAlarmStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this snmpAlarm entry. This object may not be
set to `active' unless the following columnar objects exist
in this row: snmpAlarmVariable, snmpAlarmInterval,
snmpAlarmSampleType, snmpAlarmStartupAlarm,
snmpAlarmRisingThreshold, snmpAlarmFallingThreshold,
snmpAlarmRisingEventIndex, snmpAlarmFallingEventIndex, and
snmpAlarmUnavailableEventIndex."
::= { snmpAlarmEntry 12 }
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-- alarm-related notifications
snmpAlarmNotifications
OBJECT IDENTIFIER ::= { snmpAlarm 3 }
snmpRisingAlarm NOTIFICATION-TYPE
OBJECTS { snmpAlarmVariable, snmpAlarmSampleType,
snmpAlarmValue, snmpAlarmRisingThreshold }
STATUS current
DESCRIPTION
"An event that is generated when an alarm entry crosses its
rising threshold. The instances of those objects contained
within the varbind list are those of the alarm entry which
generated this event."
::= { snmpAlarmNotifications 1 }
snmpFallingAlarm NOTIFICATION-TYPE
OBJECTS { snmpAlarmVariable, snmpAlarmSampleType,
snmpAlarmValue, snmpAlarmFallingThreshold }
STATUS current
DESCRIPTION
"An event that is generated when an alarm entry crosses its
falling threshold. The instances of those objects contained
within the varbind list are those of the alarm entry which
generated this event."
::= { snmpAlarmNotifications 2 }
snmpObjectUnavailableAlarm NOTIFICATION-TYPE
OBJECTS { snmpAlarmVariable }
STATUS current
DESCRIPTION
"An event that is generated when a variable monitored by an
alarm entry becomes unavailable. The instance of
snmpAlarmVariable contained within the varbind list is the
one associated with the alarm entry which generated this
event."
::= { snmpAlarmNotifications 3 }
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-- the event group
--
-- a collection of objects allowing the description and
-- configuration of events from a SNMPv2 entity acting
-- in a dual role.
snmpEvent OBJECT IDENTIFIER ::= { snmpM2MObjects 2 }
-- The snmpEvent table defines the set of events generated on
-- a SNMPv2 entity acting in a dual role. Each entry in the
-- snmpEventTable associates an event type with the
-- notification method and associated parameters. Some
-- snmpEvent entries are fired by an associated condition in
-- the snmpAlarmTable. Others are fired on behalf of
-- conditions defined in the NOTIFICATION-TYPE macro. The
-- snmpNotificationTable defines notifications that should
-- occur when an associated event is fired.
snmpEventNextIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index number of the next appropriate unassigned entry
in the snmpEventTable. The value 0 indicates that no
unassigned entries are available.
A management station should create new entries in the
snmpEventTable using this algorithm: first, issue a
management protocol retrieval operation to determine the
value of snmpEventNextIndex; and, second, issue a management
protocol set operation to create an instance of the
snmpEventStatus object setting its value to `createAndWait'
or 'createAndGo'."
::= { snmpEvent 1 }
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snmpEventTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpEventEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of events."
::= { snmpEvent 2 }
snmpEventEntry OBJECT-TYPE
SYNTAX SnmpEventEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of parameters that describe an event that is
generated when certain conditions are met."
INDEX { snmpEventIndex }
::= { snmpEventTable 1 }
SnmpEventEntry ::= SEQUENCE {
snmpEventIndex INTEGER,
snmpEventID OBJECT IDENTIFIER,
snmpEventDescription DisplayString,
snmpEventEvents Counter32,
snmpEventLastTimeSent TimeStamp,
snmpEventStatus RowStatus
}
snmpEventIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry in the snmpEvent
table. Each such entry defines an event generated when the
appropriate conditions occur."
::= { snmpEventEntry 1 }
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snmpEventID OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The authoritative identification of the event type
generated by this entry. This variable occurs as the second
varbind of an InformRequest-PDU. If this OBJECT IDENTIFIER
maps to a NOTIFICATION-TYPE the sender will place the
objects listed in the NOTIFICATION-TYPE in the varbind
list."
::= { snmpEventEntry 2 }
snmpEventDescription OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..127))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A comment describing this snmpEvent entry."
::= { snmpEventEntry 3 }
snmpEventEvents OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of events caused by event generators associated
with this snmpEvent entry."
::= { snmpEventEntry 4 }
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snmpEventLastTimeSent OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the time this snmpEvent entry
last generated an event. If this entry has not generated
any events, this value will be zero."
DEFVAL { 0 }
::= { snmpEventEntry 5 }
snmpEventStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this snmpEvent entry. This object may not be
set to `active' unless the following columnar objects exist
in this row: snmpEventID, snmpEventDescription,
snmpEventEvents, and snmpEventLastTimeSent.
Setting an instance of this object to the value 'destroy'
has the effect of invalidating any/all entries in the
snmpEventTable, and the snmpEventNotifyTable which reference
the corresponding snmpEventEntry."
::= { snmpEventEntry 6 }
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snmpEventNotifyMinInterval OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The minimum interval that the SNMPv2 entity acting in a
dual role will wait before retransmitting an InformRequest-
PDU. This object specifies the minimal value supported by
the SNMPv2 entity acting in a dual role, based on resource
or implementation constraints.
For a particular entry in the snmpEventNotifyTable, if the
associated snmpEventNotifyIntervalRequested variable is
greater than this object, the
snmpEventNotifyIntervalRequested value shall be used as the
minimum interval for retransmissions of InformRequest-PDUs
sent on behalf of that entry."
::= { snmpEvent 3 }
snmpEventNotifyMaxRetransmissions OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum number of times that the SNMPv2 entity acting
in a dual role will retransmit an InformRequest-PDU. This
object specifies the maximal value supported by the SNMPv2
entity acting in a dual role, based on resource or
implementation constraints.
For a particular entry in the snmpEventNotifyTable, if the
associated snmpEventNotifyRetransmissionsRequested variable
is less than this object, the
snmpEventNotifyRetransmissionsRequested value shall be used
as the retransmission count for InformRequest-PDUs sent on
behalf of that entry."
::= { snmpEvent 4 }
-- The snmpEventNotifyTable is used to configure the
-- context and retransmission parameters of notifications
-- sent by a SNMPv2 entity acting in a manager role when a
-- particular event is triggered.
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snmpEventNotifyTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpEventNotifyEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of protocol configuration entries for event
notifications from this entity."
::= { snmpEvent 5 }
snmpEventNotifyEntry OBJECT-TYPE
SYNTAX SnmpEventNotifyEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of parameters that describe the retransmission
parameters and the context to be used for InformRequest-PDUs
sent for a particular event. The snmpEventIndex in this
entry's INDEX clause identifies the snmpEventEntry which,
when triggered, will generate a notification as configured
in this entry. The contextIdentity in this entry's INDEX
clause identifies the context for which a notification will
be sent."
INDEX { snmpEventIndex, contextIdentity }
::= { snmpEventNotifyTable 1 }
SnmpEventNotifyEntry ::= SEQUENCE {
snmpEventNotifyIntervalRequested Integer32,
snmpEventNotifyRetransmissionsRequested Integer32,
snmpEventNotifyLifetime Integer32,
snmpEventNotifyStatus RowStatus
}
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snmpEventNotifyIntervalRequested OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The requested interval for retransmission of Inform PDUs
generated on the behalf of this entry.
This variable will be the actual interval used unless the
snmpEventNotifyMinInterval is greater than this object, in
which case the interval shall be equal to
snmpEventNotifyMinInterval."
DEFVAL { 30 }
::= { snmpEventNotifyEntry 1 }
snmpEventNotifyRetransmissionsRequested OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The requested number of retransmissions of an
InformRequest-PDU generated on behalf of this entry.
This variable will be the actual number of retransmissions
used unless the snmpEventNotifyMaxRetransmissions is less
than this object, in which case the retransmission count
shall be equal to snmpEventNotifyMaxRetransmissions."
DEFVAL { 5 }
::= { snmpEventNotifyEntry 2 }
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snmpEventNotifyLifetime OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The number of seconds this entry shall live until the
corresponding instance of snmpEventNotifyStatus is set to
'destroy'. This value shall count down to zero, at which
time the corresponding instance of snmpEventNotifyStatus
will be set to 'destroy'. Any management station that is
using this entry must periodically refresh this value to
ensure the continued delivery of events."
DEFVAL { 86400 }
::= { snmpEventNotifyEntry 3 }
snmpEventNotifyStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The state of this snmpEventNotifyEntry. This object may
not be set to `active' unless the following columnar objects
exist in this row: snmpEventNotifyIntervalRequested,
snmpEventNotifyRetransmissionsRequested, and
snmpEventNotifyLifetime."
::= { snmpEventNotifyEntry 4 }
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-- conformance information
snmpM2MConformance
OBJECT IDENTIFIER ::= { snmpM2M 2 }
snmpM2MCompliances
OBJECT IDENTIFIER ::= { snmpM2MConformance 1 }
snmpM2MGroups OBJECT IDENTIFIER ::= { snmpM2MConformance 2 }
-- compliance statements
snmpM2MCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for SNMPv2 entities which
implement the Manager-to-Manager MIB."
MODULE -- this module
MANDATORY-GROUPS { snmpAlarmGroup, snmpEventGroup }
::= { snmpM2MCompliances 1 }
-- units of conformance
snmpAlarmGroup OBJECT-GROUP
OBJECTS { snmpAlarmNextIndex,
snmpAlarmVariable, snmpAlarmInterval,
snmpAlarmSampleType, snmpAlarmValue,
snmpAlarmStartupAlarm, snmpAlarmRisingThreshold,
snmpAlarmFallingThreshold,
snmpAlarmRisingEventIndex,
snmpAlarmFallingEventIndex,
snmpAlarmUnavailableEventIndex,
snmpAlarmStatus }
STATUS current
DESCRIPTION
"A collection of objects allowing the description and
configuration of threshold alarms from a SNMPv2 entity
acting in a dual role."
::= { snmpM2MGroups 1 }
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snmpEventGroup OBJECT-GROUP
OBJECTS { snmpEventNextIndex,
snmpEventID, snmpEventDescription,
snmpEventEvents, snmpEventLastTimeSent,
snmpEventStatus, snmpEventNotifyMinInterval,
snmpEventNotifyMaxRetransmissions,
snmpEventNotifyIntervalRequested,
snmpEventNotifyRetransmissionsRequested,
snmpEventNotifyLifetime, snmpEventNotifyStatus }
STATUS current
DESCRIPTION
"A collection of objects allowing the description and
configuration of events from a SNMPv2 entity acting in a
dual role."
::= { snmpM2MGroups 2 }
END
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4. Acknowledgements
This document is a modified version of RFC 1451.
5. References
[1] Information processing systems - Open Systems Interconnection -
Specification of Abstract Syntax Notation One (ASN.1),
International Organization for Standardization. International
Standard 8824, (December, 1987).
[2] Case, J., McCloghrie, K., Rose, M., and Waldbusser, S., "Structure
of Management Information for Version 2 of the Simple Network
Management Protocol (SNMPv2)", Internet Draft, SNMP Research, Inc.,
Cisco Systems, Dover Beach Consulting, Inc., Carnegie Mellon
University, November 1994.
[3] Case, J., McCloghrie, K., Rose, M., and Waldbusser, S., "Protocol
Operations for Version 2 of the Simple Network Management Protocol
(SNMPv2)", Internet Draft, SNMP Research, Inc., Cisco Systems,
Dover Beach Consulting, Inc., Carnegie Mellon University, November
1994.
[4] Galvin, J., and McCloghrie, K., "Administrative Model for Version 2
of the Simple Network Management Protocol (SNMPv2)", Internet
Draft, Trusted Information Systems, Cisco Systems, November 1994.
[5] McCloghrie, K., and Galvin, J., "Party MIB for Version 2 of the
Simple Network Management Protocol (SNMPv2)", Internet Draft, Cisco
Systems, Trusted Information Systems, November 1994.
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6. Security Considerations
Security issues are not discussed in this memo.
7. Authors' Addresses
Jeffrey D. Case
SNMP Research, Inc.
3001 Kimberlin Heights Rd.
Knoxville, TN 37920-9716
US
Phone: +1 615 573 1434
Email: case@snmp.com
Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive,
San Jose CA 95134-1706.
Phone: +1 408 526 5260
Email: kzm@cisco.com
Marshall T. Rose
Dover Beach Consulting, Inc.
420 Whisman Court
Mountain View, CA 94043-2186
US
Phone: +1 415 968 1052
Email: mrose@dbc.mtview.ca.us
Steven Waldbusser
Carnegie Mellon University
5000 Forbes Ave
Pittsburgh, PA 15213
US
Phone: +1 412 268 6628
Email: waldbusser@cmu.edu
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Table of Contents
1 Introduction .................................................... 2
1.1 A Note on Terminology ......................................... 2
1.2 Change Log .................................................... 2
2 Overview ........................................................ 4
2.1 A SNMPv2 Entity Acting in a Dual Role ......................... 4
2.2 Alarms, Events, and Notifications ............................. 4
2.3 Destinations of Inform-Request PDUs ........................... 4
2.4 Access Control ................................................ 5
3 Definitions ..................................................... 7
3.1 The Alarm Group ............................................... 8
3.1.1 Alarm-Related Notifications ................................. 20
3.2 The Event Group ............................................... 21
3.3 Conformance Information ....................................... 29
3.3.1 Compliance Statements ....................................... 29
3.3.2 Units of Conformance ........................................ 29
4 Acknowledgements ................................................ 31
5 References ...................................................... 31
6 Security Considerations ......................................... 32
7 Authors' Addresses .............................................. 32
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