|
Network Working Group Request for Comments: 3434 Category:Standards Track |
A. Bierman K. McCloghrie Cisco Systems, Inc. December 2002 |
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.
Copyright © The Internet Society (2002). All Rights Reserved.
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects for extending the alarm thresholding capabilities found in the Remote Monitoring (RMON) MIB (RFC 2819), to provide similar threshold monitoring of objects based on the Counter64 data type.
1 The Internet-Standard Management Framework
2 Terms
3 Overview
3.1 Relationship to the Remote Monitoring MIBs
4 MIB Structure
4.1 MIB Group Overview
4.1.1 High Capacity Alarm Control Group
4.1.2 High Capacity Alarm Capabilities
4.1.3 High Capacity Alarm Notifications
5 Definitions
6 Intellectual Property
7 Acknowledgements
8 Normative References
9 Informative References
10 Security Considerations
11 Authors' Addresses
12 Full Copyright Statement
For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410].
Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580].
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, RFC 2119. [RFC2119]
There is a need for a standardized way of providing the same type of alarm thresholding capabilities for Counter64 objects, as already exists for Counter32 objects. The RMON-1 alarmTable objects and RMON-1 notification types are specific to 32-bit objects, and cannot be used to properly monitor Counter64-based objects. Extensions to these existing constructs which explicitly support Counter64-based objects are needed. These extensions are completely independent of the existing RMON-1 alarm mechanisms.
The usage of Counter64 objects is increasing. One of the causes for this increase is the increasing speeds of network interfaces; RFC 2863 [RFC2863] says:
As the speed of network media increase, the minimum time in which a 32 bit counter will wrap decreases. For example, a 10Mbs stream of back-to-back, full-size packets causes ifInOctets to wrap in just over 57 minutes; at 100Mbs, the minimum wrap time is 5.7 minutes, and at 1Gbs, the minimum is 34 seconds. Requiring that interfaces be polled frequently enough not to miss a counter wrap is increasingly problematic.
and therefore requires:
For interfaces that operate at 20,000,000 (20 million) bits per second or less, 32-bit byte and packet counters MUST be supported. For interfaces that operate faster than 20,000,000 bits/second, and slower than 650,000,000 bits/second, 32-bit packet counters MUST be supported and 64-bit octet counters MUST be supported. For interfaces that operate at 650,000,000 bits/second or faster, 64-bit packet counters AND 64-bit octet counters MUST be supported.
Of the variables on which thresholds are set using RMON-1's alarmTable, two of the most popular are: ifInOctets and ifOutOctets. Thus, the increasing usage of the 64-bit versions: ifHCInOctets and ifHCOutOctets means that there is an increasing requirement to use RMON-1's thresholding capability for ifHCInOctets and ifHCOutOctets.
The RMON-1 Alarm Group is implemented not only by all RMON probes, but also by the SNMP agents in many other types of devices for the purpose of monitoring any of their (non-RMON) integer-valued MIB objects. The fact that it has been so widely implemented indicates its obvious value. Without this extension, that obvious value is becoming incomplete because of its lack of support for 64-bit integers. This extension is the easiest, simplest, and most compatible way for an implementation to overcome that lack of support.
This MIB is intended to be implemented in Remote Monitoring (RMON) probes, which may also support the RMON-1 MIB [RFC2819]. Such probes may be stand-alone devices, or may be co-located with other networking devices (e.g., ethernet switches and repeaters).
The functionality of the High Capacity Alarm Group is a superset of RMON-1's Alarm Group. Thus, one day in the distant future, it is a possibility that RMON-1's Alarm Group will be deprecated in favor of this MIB's High Capacity Alarm Group. However, that day will not come before this document, or one of its successors, reaches the same standardization state as RMON-1.
Figure 1: HC-ALARM MIB Functional Structure
+---------------------------------------------+
| |
| (RMON-1) (HC-ALARM) |
| +-----------+ +-----------+ |
| | | | | |
| | alarm | | hcAlarm | |
| | Table | | Table | |
| | | | | |
| +-----------+ +-----------+ |
| | | |
| V (RMON-1) V |
| +----------------------------------+ |
| | | |
| | eventTable | |
| | | |
| +----------------------------------+ |
| | | |
| | | |
| V V |
| +---------------+ +----------------+ |
| | risingAlarm | | hcRisingAlarm | |
| | fallingAlarm | | hcFallingAlarm | |
| | Notifications | | Notifications | |
| +---------------+ +----------------+ |
| (RMON-1) (HC-ALARM) |
+---------------------------------------------+
The HC-ALARM MIB contains three MIB groups:
- hcAlarmControlObjects group
Controls the configuration of alarms for high capacity MIB
object instances.
- hcAlarmCapabilities group
Describes the high capacity alarm capabilities provided by the
agent.
- hcAlarmNotifications group
Provide new rising and falling threshold notifications for high
capacity objects.
This group contains one table, which is used by a management station to configure high capacity alarm entries. To configure alarm thresholding for Counter64 or CounterBasedGauge64 objects, a management application must configure the hcAlarmTable in a manner similar to how RMON-1's alarmTable is configured.
Because the language in some of the DESCRIPTION clauses of objects in the alarmTable is specific to the alarmTable itself, their defined semantics do not allow them to be used for this MIB also. Therefore, the following objects are essentially cloned from the alarmTable to the hcAlarmTable:
alarmTable hcAlarmTable
---------- ------------
alarmIndex hcAlarmIndex
alarmInterval hcAlarmInterval
alarmVariable hcAlarmVariable
alarmSampleType hcAlarmSampleType
alarmStartupAlarm hcAlarmStartupAlarm
alarmRisingEventIndex hcAlarmRisingEventIndex
alarmFallingEventIndex hcAlarmFallingEventIndex
alarmOwner hcAlarmOwner
alarmStatus hcAlarmStatus
In addition, the following hcAlarmTable objects are used as high capacity values instead of the corresponding 32-bit version in the alarmTable.
alarmTable hcAlarmTable
---------- ------------
alarmValue hcAlarmAbsValue
hcAlarmValueStatus
alarmRisingThreshold hcAlarmRisingThreshAbsValueLo
hcAlarmRisingThreshAbsValueHi
hcAlarmRisingThresholdValStatus
alarmFallingThreshold hcAlarmFallingThreshAbsValueLo
hcAlarmFallingThreshAbsValueHi
hcAlarmFallingThresholdValStatus
Nevertheless, the hcAlarmTable does have a few differences from the alarmTable:
- Counter64 based objects are thresholded properly
- an entry is not destroyed if the instance identified by the
hcAlarmVariable is not available during a polling interval.
- the RowStatus textual convention is used instead of EntryStatus
for the hcAlarmStatus object.
- the non-volatile storage of an HC alarm entry is explicitly
controlled with a StorageType parameter.
- a counter is provided to indicate the number of times the
hcAlarmVariable object value could not be retrieved by the
agent.
This group contains a single scalar object, called
hcAlarmCapabilities. It describes the basic high capacity alarm
features supported by the agent.
This group contains two notifications, hcRisingAlarm and
hcFallingAlarm. These are generated for high capacity alarms in the
same manner and used to convey essentially the same information as
RMON-1's risingAlarm and fallingAlarm notifications do for
alarmTable-specified alarms.
HC-ALARM-MIB DEFINITIONS ::= BEGIN
LAST-UPDATED "200212160000Z"
ORGANIZATION "IETF RMONMIB Working Group"
CONTACT-INFO
" Andy Bierman
Cisco Systems, Inc.
Tel: +1 408 527-3711
E-mail: abierman@cisco.com
Postal: 170 West Tasman Drive
San Jose, CA USA 95134
Keith McCloghrie
Cisco Systems, Inc.
Tel: +1 408 526-5260
E-mail: kzm@cisco.com
Postal: 170 West Tasman Drive
San Jose, CA USA 95134
Send comments to <rmonmib@ietf.org>
Mailing list subscription info:
http://www.ietf.org/mailman/listinfo/rmonmib "
DESCRIPTION
"This module defines Remote Monitoring MIB extensions for
High Capacity Alarms.
Copyright © The Internet Society (2002). This version of this MIB module is part of RFC 3434; see the RFC itself for full legal notices."
REVISION "200212160000Z"
DESCRIPTION
"Initial version of the High Capacity Alarm MIB module.
This version published as RFC 3434."
::= { rmon 29 }
hcAlarmObjects OBJECT IDENTIFIER ::= { hcAlarmMIB 1 }
hcAlarmNotifications OBJECT IDENTIFIER ::= { hcAlarmMIB 2 }
hcAlarmConformance OBJECT IDENTIFIER ::= { hcAlarmMIB 3 }
hcAlarmControlObjects OBJECT IDENTIFIER ::= { hcAlarmObjects 1 }
::= { hcAlarmObjects 2 }
--
-- Textual Conventions
--
HcValueStatus ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"This data type indicates the validity and sign of the data
in associated object instances which represent the absolute
value of a high capacity numeric quantity. Such an object
may be represented with one or more object instances. An
object of type HcValueStatus MUST be defined within the same
structure as the object(s) representing the high capacity absolute value.
If the associated object instance(s) representing the high capacity absolute value could not be accessed during the sampling interval, and is therefore invalid, then the associated HcValueStatus object will contain the value 'valueNotAvailable(1)'.
If the associated object instance(s) representing the high
capacity absolute value are valid and actual value of the
sample is greater than or equal to zero, then the associated
HcValueStatus object will contain the value
'valuePositive(2)'.
If the associated object instance(s) representing the high
capacity absolute value are valid and the actual value of
the sample is less than zero, then the associated
HcValueStatus object will contain the value
'valueNegative(3)'. The associated absolute value should be
multiplied by -1 to obtain the true sample value."
SYNTAX INTEGER {
valueNotAvailable(1),
valuePositive(2),
valueNegative(3)
}
--
-- High Capacity Alarm Table
--
SYNTAX SEQUENCE OF HcAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of entries for the configuration of high capacity
alarms."
::= { hcAlarmControlObjects 1 }
SYNTAX HcAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A conceptual row in the hcAlarmTable. Entries are usually
created in this table by management application action, but
may also be created by agent action as well."
INDEX { hcAlarmIndex }
::= { hcAlarmTable 1 }
HcAlarmEntry ::= SEQUENCE {
hcAlarmIndex Integer32,
hcAlarmInterval Integer32,
hcAlarmVariable VariablePointer,
hcAlarmSampleType INTEGER,
hcAlarmAbsValue CounterBasedGauge64,
hcAlarmValueStatus HcValueStatus,
hcAlarmStartupAlarm INTEGER,
hcAlarmRisingThreshAbsValueLo Unsigned32,
hcAlarmRisingThreshAbsValueHi Unsigned32,
hcAlarmRisingThresholdValStatus HcValueStatus,
hcAlarmFallingThreshAbsValueLo Unsigned32,
hcAlarmFallingThreshAbsValueHi Unsigned32,
hcAlarmFallingThresholdValStatus HcValueStatus,
hcAlarmRisingEventIndex Integer32,
hcAlarmFallingEventIndex Integer32,
hcAlarmValueFailedAttempts Counter32,
hcAlarmOwner OwnerString,
hcAlarmStorageType StorageType,
hcAlarmStatus RowStatus }
SYNTAX Integer32 (1..65535)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An arbitrary integer index value used to uniquely identify
this high capacity alarm entry."
::= { hcAlarmEntry 1 }
SYNTAX Integer32 (1..2147483647)
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 variable, care should be taken in the case of
deltaValue sampling - the interval should be set short
enough that the sampled variable is very unlikely to
increase or decrease by more than 2^63 - 1 during a single
sampling interval.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 2 }
SYNTAX VariablePointer
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 (INTEGER, Integer32, Counter32, Counter64,
Gauge, or TimeTicks) may be sampled.
Because SNMP access control is articulated entirely in terms of the contents of MIB views, no access control mechanism exists that can restrict the value of this object to identify only those objects that exist in a particular MIB view. Because there is thus no acceptable means of restricting the read access that could be obtained through the alarm mechanism, the probe must only grant write access to this object in those views that have read access to all objects on the probe.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 3 }
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(1), the value
of the selected variable will be compared directly with the
thresholds at the end of the sampling interval. If the
value of this object is deltaValue(2), the value of the
selected variable at the last sample will be subtracted from
the current value, and the difference compared with the
thresholds.
If the associated hcAlarmVariable instance could not be obtained at the previous sample interval, then a delta
sample is not possible, and the value of the associated hcAlarmValueStatus object for this interval will be valueNotAvailable(1).
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 4 }
SYNTAX CounterBasedGauge64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The absolute value (i.e., unsigned value) of the
hcAlarmVariable statistic during the last sampling period.
The value during the current sampling period is not made
available until the period is completed.
To obtain the true value for this sampling interval, the associated instance of hcAlarmValueStatus must be checked, and the value of this object adjusted as necessary.
If the MIB instance could not be accessed during the sampling interval, then this object will have a value of zero and the associated instance of hcAlarmValueStatus will be set to 'valueNotAvailable(1)'."
::= { hcAlarmEntry 5 }
SYNTAX HcValueStatus
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the validity and sign of the data for
the hcAlarmAbsValue object, as described in the
HcValueStatus textual convention."
::= { hcAlarmEntry 6 }
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 rising threshold and this
object is equal to risingAlarm(1) or
risingOrFallingAlarm(3), then a single rising alarm will be
generated. If the first sample after this entry becomes
valid is less than or equal to the falling threshold and
this object is equal to fallingAlarm(2) or
risingOrFallingAlarm(3), then a single falling alarm will be
generated.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 7 }
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The lower 32 bits of the absolute value for threshold for
the sampled statistic. The actual threshold value is
determined by the associated instances of the
hcAlarmRisingThreshAbsValueHi and
hcAlarmRisingThresholdValStatus objects, as follows:
ABS(threshold) = hcAlarmRisingThreshAbsValueLo +
(hcAlarmRisingThreshAbsValueHi * 2^^32)
The absolute value of the threshold is adjusted as required, as described in the HcValueStatus textual convention. These three object instances are conceptually combined to represent the rising threshold for this entry.
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 valid is greater than
or equal to this threshold and the associated
hcAlarmStartupAlarm is equal to risingAlarm(1) or
risingOrFallingAlarm(3).
After a rising event is generated, another such event will
not be generated until the sampled value falls below this
threshold and reaches the threshold identified by the
hcAlarmFallingThreshAbsValueLo,
hcAlarmFallingThreshAbsValueHi, and
hcAlarmFallingThresholdValStatus objects.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 8 }
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The upper 32 bits of the absolute value for threshold for
the sampled statistic. The actual threshold value is
determined by the associated instances of the
hcAlarmRisingThreshAbsValueLo and
hcAlarmRisingThresholdValStatus objects, as follows:
ABS(threshold) = hcAlarmRisingThreshAbsValueLo +
(hcAlarmRisingThreshAbsValueHi * 2^^32)
The absolute value of the threshold is adjusted as required, as described in the HcValueStatus textual convention. These three object instances are conceptually combined to represent the rising threshold for this entry.
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 valid is greater than
or equal to this threshold and the associated
hcAlarmStartupAlarm is equal to risingAlarm(1) or
risingOrFallingAlarm(3).
After a rising event is generated, another such event will
not be generated until the sampled value falls below this
threshold and reaches the threshold identified by the
hcAlarmFallingThreshAbsValueLo,
hcAlarmFallingThreshAbsValueHi, and
hcAlarmFallingThresholdValStatus objects.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 9 }
SYNTAX HcValueStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates the sign of the data for the rising
threshold, as defined by the hcAlarmRisingThresAbsValueLo
and hcAlarmRisingThresAbsValueHi objects, as described in
the HcValueStatus textual convention.
The enumeration 'valueNotAvailable(1)' is not allowed, and the associated hcAlarmStatus object cannot be equal to 'active(1)' if this object is set to this value.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 10 }
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The lower 32 bits of the absolute value for threshold for
the sampled statistic. The actual threshold value is
determined by the associated instances of the
hcAlarmFallingThreshAbsValueHi and
hcAlarmFallingThresholdValStatus objects, as follows:
ABS(threshold) = hcAlarmFallingThreshAbsValueLo +
(hcAlarmFallingThreshAbsValueHi * 2^^32)
The absolute value of the threshold is adjusted as required, as described in the HcValueStatus textual convention. These three object instances are conceptually combined to represent the falling threshold for this entry.
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 valid is less than or
equal to this threshold and the associated
hcAlarmStartupAlarm is equal to fallingAlarm(2) or
risingOrFallingAlarm(3).
After a falling event is generated, another such event will
not be generated until the sampled value rises above this
threshold and reaches the threshold identified by the
hcAlarmRisingThreshAbsValueLo,
hcAlarmRisingThreshAbsValueHi, and
hcAlarmRisingThresholdValStatus objects.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 11 }
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The upper 32 bits of the absolute value for threshold for
the sampled statistic. The actual threshold value is
determined by the associated instances of the
hcAlarmFallingThreshAbsValueLo and
hcAlarmFallingThresholdValStatus objects, as follows:
ABS(threshold) = hcAlarmFallingThreshAbsValueLo +
(hcAlarmFallingThreshAbsValueHi * 2^^32)
The absolute value of the threshold is adjusted as required, as described in the HcValueStatus textual convention. These three object instances are conceptually combined to represent the falling threshold for this entry.
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 valid is less than or
equal to this threshold and the associated
hcAlarmStartupAlarm is equal to fallingAlarm(2) or
risingOrFallingAlarm(3).
After a falling event is generated, another such event will
not be generated until the sampled value rises above this
threshold and reaches the threshold identified by the
hcAlarmRisingThreshAbsValueLo,
hcAlarmRisingThreshAbsValueHi, and
hcAlarmRisingThresholdValStatus objects.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 12 }
SYNTAX HcValueStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates the sign of the data for the falling threshold, as defined by the hcAlarmFallingThreshAbsValueLo and hcAlarmFallingThreshAbsValueHi objects, as described in the HcValueStatus textual convention.
The enumeration 'valueNotAvailable(1)' is not allowed, and the associated hcAlarmStatus object cannot be equal to 'active(1)' if this object is set to this value.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 13 }
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The index of the eventEntry that is used when a rising
threshold is crossed. The eventEntry identified by a
particular value of this index is the same as identified by
the same value of the eventIndex object. If there is no
corresponding entry in the eventTable, then no association
exists. In particular, if this value is zero, no associated
event will be generated, as zero is not a valid event index.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 14 }
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The index of the eventEntry that is used when a falling
threshold is crossed. The eventEntry identified by a
particular value of this index is the same as identified by
the same value of the eventIndex object. If there is no
corresponding entry in the eventTable, then no association
exists. In particular, if this value is zero, no associated
event will be generated, as zero is not a valid event index.
This object may not be modified if the associated hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 15 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times the associated hcAlarmVariable instance
was polled on behalf of this hcAlarmEntry, (while in the
active state) and the value was not available. This counter
may experience a discontinuity if the agent restarts,
indicated by the value of sysUpTime."
::= { hcAlarmEntry 16 }
SYNTAX OwnerString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The entity that configured this entry and is therefore
using the resources assigned to it."
::= { hcAlarmEntry 17 }
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The type of non-volatile storage configured for this entry.
If this object is equal to 'permanent(4)', then the
associated hcAlarmRisingEventIndex and
hcAlarmFallingEventIndex objects must be writable."
::= { hcAlarmEntry 18 }
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this row.
An entry MUST NOT exist in the active state unless all objects in the entry have an appropriate value, as described in the description clause for each writable object.
The hcAlarmStatus object may be modified if the associated
instance of this object is equal to active(1),
notInService(2), or notReady(3). All other writable objects
may be modified if the associated instance of this object is
equal to notInService(2) or notReady(3)."
::= { hcAlarmEntry 19 }
--
-- Capabilities
--
SYNTAX BITS {
hcAlarmCreation(0),
hcAlarmNvStorage(1)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An indication of the high capacity alarm capabilities
supported by this agent.
If the 'hcAlarmCreation' BIT is set, then this agent allows NMS applications to create entries in the hcAlarmTable.
If the 'hcAlarmNvStorage' BIT is set, then this agent allows entries in the hcAlarmTable which will be recreated after a system restart, as controlled by the hcAlarmStorageType object."
::= { hcAlarmCapabilitiesObjects 1 }
--
-- Notifications
--
::= { hcAlarmNotifications 0 }
STATUS current
DESCRIPTION
"The SNMP notification that is generated when a high
capacity alarm entry crosses its rising threshold and
generates an event that is configured for sending SNMP
traps.
The hcAlarmEntry object instances identified in the OBJECTS
clause are from the entry that causes this notification to be generated."
::= { hcAlarmNotifPrefix 1 }
STATUS current
DESCRIPTION
"The SNMP notification that is generated when a high
capacity alarm entry crosses its falling threshold and
generates an event that is configured for sending SNMP
traps.
The hcAlarmEntry object instances identified in the OBJECTS clause are from the entry that causes this notification to be generated."
::= { hcAlarmNotifPrefix 2 }
--
-- Conformance Section
--
hcAlarmCompliances OBJECT IDENTIFIER ::= { hcAlarmConformance 1 }
hcAlarmGroups OBJECT IDENTIFIER ::= { hcAlarmConformance 2 }
MANDATORY-GROUPS {
hcAlarmControlGroup,
hcAlarmCapabilitiesGroup,
hcAlarmNotificationsGroup
}
MODULE RMON-MIB
MANDATORY-GROUPS { rmonEventGroup }
::= { hcAlarmCompliances 1 }
-- Object Groups
OBJECTS {
hcAlarmInterval,
hcAlarmVariable,
hcAlarmSampleType,
hcAlarmAbsValue,
hcAlarmValueStatus,
hcAlarmStartupAlarm,
hcAlarmRisingThreshAbsValueLo,
hcAlarmRisingThreshAbsValueHi,
hcAlarmRisingThresholdValStatus,
hcAlarmFallingThreshAbsValueLo,
hcAlarmFallingThreshAbsValueHi,
hcAlarmFallingThresholdValStatus,
hcAlarmRisingEventIndex,
hcAlarmFallingEventIndex,
hcAlarmValueFailedAttempts,
hcAlarmOwner,
hcAlarmStorageType,
hcAlarmStatus
}
STATUS current
DESCRIPTION
"A collection of objects used to configure entries for high
capacity alarm threshold monitoring purposes."
::= { hcAlarmGroups 1 }
OBJECTS {
hcAlarmCapabilities
}
STATUS current
DESCRIPTION
"A collection of objects used to indicate an agent's high
capacity alarm threshold monitoring capabilities."
::= { hcAlarmGroups 2 }
NOTIFICATIONS {
hcRisingAlarm,
hcFallingAlarm
}
STATUS current
DESCRIPTION
"A collection of notifications to deliver information
related to a high capacity rising or falling threshold event
to a management application."
::= { hcAlarmGroups 3 }
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This memo is a product of the RMONMIB working group, and is based on existing alarmTable objects in the RMON-1 MIB module [RFC2819]. In order to maintain the RMON 'look-and-feel' and semantic consistency, some of Steve Waldbusser's text from [RFC2819] has been adapted for use in this MIB.
[RFC2026] Bradner, S., "The Internet Standards Process -- Revision 3", BCP 9, RFC 2026, October 1996.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.
[RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999.
[RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Conformance Statements for SMIv2", RFC 2580, STD 58, April 1999.
[RFC2819] Waldbusser, S., "Remote Network Monitoring Management Information Base", STD 59, RFC 2819, May 2000.
[RFC3414] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", STD 62, RFC 3414, December 2002.
[RFC3415] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3415, December 2002.
[RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002.
[RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June, 2000.
There are a number of management objects defined in this MIB that have a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations.
There are a number of managed objects in this MIB that may contain sensitive information. These are:
hcAlarmAbsValue
hcAlarmValueStatus
These objects are used together, and may expose the values of particular MIB instances, as identified by associated instances of the hcAlarmVariable object.
hcAlarmVariable
This object identifies the object instance that the associated hcAlarmEntry will periodically sample. Because SNMP access control is articulated entirely in terms of the contents of MIB views, no access control mechanism exists that can restrict the value of this object to identify only those objects that exist in a particular MIB view. Thus, because there is no acceptable means of restricting the read access that could be obtained through the alarm mechanism, the probe must only grant write access to this object in those views that have read access to all objects on the probe.
SNMPv1 by itself is not a secure environment. Even if the network itself is secure (for example by using IPSec), there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB.
It is recommended that the implementors consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model STD 62, RFC 3414 [RFC3414] and the View-based Access Control Model STD 62, RFC 3415 [RFC3415] is recommended.
It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, is properly configured to give access to only the objects, and to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.
Andy Bierman
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA USA 95134
Phone: +1 408-527-3711
EMail: abierman@cisco.com
Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA USA 95134
Phone: +1 408-526-5260
EMail: kzm@cisco.com
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