Network Working Group J. Case
Request for Comments: 1451 SNMP Research, Inc.
K. McCloghrie
Hughes LAN Systems
M. Rose
Dover Beach Consulting, Inc.
S. Waldbusser
Carnegie Mellon University
April 1993
Status of this Memo
This RFC specifes an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Table of Contents
1 Introduction
1.1 A Note on Terminology
2 Overview
2.1 A SNMPv2 Entity Acting in a Dual Role
2.2 Alarms, Events, and Notifications
2.3 Access Control
3 Definitions
3.1 The Alarm Group
3.1.1 Alarm-Related Notifications
3.2 The Event Group
3.3 Conformance Information
3.3.1 Compliance Statements
3.3.2 Units of Conformance
4 Acknowledgements
5 References
6 Security Considerations
7 Authors' Addresses
Case, McCloghrie, Rose & Waldbusser [Page 1]
A network 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 both authentication and authorization policies.
Network management stations execute management applications which monitor and control network elements. Network elements are devices such as hosts, routers, terminal servers, etc., which are monitored and controlled through 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.
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).
Case, McCloghrie, Rose & Waldbusser [Page 2]
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.
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.
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.
Case, McCloghrie, Rose & Waldbusser [Page 3]
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, by convention, to parties on SNMPv2 entities that implement the snmpAlarmTable, must include the 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.
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 }
Case, McCloghrie, Rose & Waldbusser [Page 4]
viewIndex = { ViewIndex }
viewSubtree = { snmpAlarmEntry 0 sampleContext }
viewStatus = { included }
viewMask = { 'FFEF'H } -- specifies wildcard for column
Case, McCloghrie, Rose & Waldbusser [Page 5]
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 "9304010000Z"
ORGANIZATION "IETF SNMPv2 Working Group"
CONTACT-INFO
" Steven Waldbusser
Postal: Carnegie Mellon University
4910 Forbes Ave
Pittsburgh, PA 15213
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 }
Case, McCloghrie, Rose & Waldbusser [Page 6]
-- 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.
--
Case, McCloghrie, Rose & Waldbusser [Page 7]
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)."
::= { snmpAlarm 1 }
snmpAlarmTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of snmpAlarm entries."
::= { snmpAlarm 2 }
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 }
Case, McCloghrie, Rose & Waldbusser [Page 8]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 9]
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."
Case, McCloghrie, Rose & Waldbusser [Page 10]
::= { snmpAlarmEntry 2 }
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 }
Case, McCloghrie, Rose & Waldbusser [Page 11]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 12]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 13]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 14]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 15]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 16]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 17]
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 }
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 }
Case, McCloghrie, Rose & Waldbusser [Page 18]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 19]
-- 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 }
Case, McCloghrie, Rose & Waldbusser [Page 20]
-- 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 }
Case, McCloghrie, Rose & Waldbusser [Page 21]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 22]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 23]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 24]
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 time 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
Case, McCloghrie, Rose & Waldbusser [Page 25]
-- destination and type of notifications sent by a SNMPv2
-- entity acting in a manager role when a particular event
-- is triggered.
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 type and
destination of 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 to which a notification
will be sent."
INDEX { snmpEventIndex, contextIdentity }
::= { snmpEventNotifyTable 1 }
SnmpEventNotifyEntry ::= SEQUENCE {
snmpEventNotifyIntervalRequested Integer32,
snmpEventNotifyRetransmissionsRequested Integer32,
snmpEventNotifyLifetime Integer32,
snmpEventNotifyStatus RowStatus
}
Case, McCloghrie, Rose & Waldbusser [Page 26]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 27]
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 }
Case, McCloghrie, Rose & Waldbusser [Page 28]
-- 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 }
Case, McCloghrie, Rose & Waldbusser [Page 29]
::= { snmpM2MGroups 2 }
END
Case, McCloghrie, Rose & Waldbusser [Page 30]
The comments of the SNMP version 2 working group are gratefully acknowledged:
Beth Adams, Network Management Forum
Steve Alexander, INTERACTIVE Systems Corporation
David Arneson, Cabletron Systems
Toshiya Asaba
Fred Baker, ACC
Jim Barnes, Xylogics, Inc.
Brian Bataille
Andy Bierman, SynOptics Communications, Inc.
Uri Blumenthal, IBM Corporation
Fred Bohle, Interlink
Jack Brown
Theodore Brunner, Bellcore
Stephen F. Bush, GE Information Services
Jeffrey D. Case, University of Tennessee, Knoxville
John Chang, IBM Corporation
Szusin Chen, Sun Microsystems
Robert Ching
Chris Chiotasso, Ungermann-Bass
Bobby A. Clay, NASA/Boeing
John Cooke, Chipcom
Tracy Cox, Bellcore
Juan Cruz, Datability, Inc.
David Cullerot, Cabletron Systems
Cathy Cunningham, Microcom
James R. (Chuck) Davin, Bellcore
Michael Davis, Clearpoint
Mike Davison, FiberCom
Cynthia DellaTorre, MITRE
Taso N. Devetzis, Bellcore
Manual Diaz, DAVID Systems, Inc.
Jon Dreyer, Sun Microsystems
David Engel, Optical Data Systems
Mike Erlinger, Lexcel
Roger Fajman, NIH
Daniel Fauvarque, Sun Microsystems
Karen Frisa, CMU
Shari Galitzer, MITRE
Shawn Gallagher, Digital Equipment Corporation
Richard Graveman, Bellcore
Maria Greene, Xyplex, Inc.
Case, McCloghrie, Rose & Waldbusser [Page 31]
Case, McCloghrie, Rose & Waldbusser [Page 32]
Case, McCloghrie, Rose & Waldbusser [Page 33]
Case, McCloghrie, Rose & Waldbusser [Page 34]
[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)", RFC 1442, SNMP Research, Inc., Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon University, April 1993.
[3] Case, J., McCloghrie, K., Rose, M., and Waldbusser, S., "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.
[4] Galvin, J., and McCloghrie, K., "Administrative Model for version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1445, Trusted Information Systems, Hughes LAN Systems, April 1993.
[5] McCloghrie, K., and Galvin, J., "Party MIB for version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1447, Hughes LAN Systems, Trusted Information Systems, April 1993.
Case, McCloghrie, Rose & Waldbusser [Page 35]
Security issues are not discussed in this memo.
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
Hughes LAN Systems
1225 Charleston Road
Mountain View, CA 94043
US
Phone: +1 415 966 7934
Email: kzm@hls.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
4910 Forbes Ave
Pittsburgh, PA 15213
US
Phone: +1 412 268 6628
Email: waldbusser@cmu.edu
Case, McCloghrie, Rose & Waldbusser [Page 36]