RFC3434: Remote Monitoring MIB Extensions for High Capacity Alarms
Download in PDF format Download in text format
Related keywords:
(counter64)
(management information base)
(MIB)
(Remote Monitoring)
(RMON)
(simple network management protocol)
(SMIv2)
(SNMP)
(Structure of Management Information Version 2)
Network Working Group A. Bierman
Request for Comments: 3434 K. McCloghrie
Category:Standards Track Cisco Systems, Inc.
December 2002
Remote Monitoring MIB Extensions for
High Capacity Alarms
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
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.
Table of Contents
1 The Internet-Standard Management Framework ................... 2
2 Terms ........................................................ 2
3 Overview ..................................................... 2
3.1 Relationship to the Remote Monitoring MIBs ............... 3
4 MIB Structure ................................................ 4
4.1 MIB Group Overview ....................................... 4
4.1.1 High Capacity Alarm Control Group .................. 5
4.1.2 High Capacity Alarm Capabilities ................... 6
4.1.3 High Capacity Alarm Notifications .................. 6
5 Definitions .................................................. 6
6 Intellectual Property ........................................ 21
7 Acknowledgements ............................................. 21
8 Normative References ......................................... 21
9 Informative References ....................................... 22
Bierman & McCloghrie Standards Track [Page 1]
RFC 3434 High Capacity Alarm MIB December 2002
10 Security Considerations ..................................... 22
11 Authors' Addresses .......................................... 23
12 Full Copyright Statement .................................... 24
1. The Internet-Standard Management Framework
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].
2. Terms
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]
3. Overview
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.
Bierman & McCloghrie Standards Track [Page 2]
RFC 3434 High Capacity Alarm MIB December 2002
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.
3.1. Relationship to the Remote Monitoring MIBs
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.
Bierman & McCloghrie Standards Track [Page 3]
RFC 3434 High Capacity Alarm MIB December 2002
4. MIB Structure
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) |
+---------------------------------------------+
4.1. MIB Group Overview
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.
Bierman & McCloghrie Standards Track [Page 4]
RFC 3434 High Capacity Alarm MIB December 2002
4.1.1. High Capacity Alarm Control Group
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.
Bierman & McCloghrie Standards Track [Page 5]
RFC 3434 High Capacity Alarm MIB December 2002
- 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.
4.1.2. High Capacity Alarm Capabilities
This group contains a single scalar object, called
hcAlarmCapabilities. It describes the basic high capacity alarm
features supported by the agent.
4.1.3. High Capacity Alarm Notifications
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.
5. Definitions
HC-ALARM-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
Integer32, Counter32, Unsigned32
FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP
FROM SNMPv2-CONF
RowStatus, VariablePointer, StorageType,
TEXTUAL-CONVENTION
FROM SNMPv2-TC
CounterBasedGauge64
FROM HCNUM-TC
rmon, OwnerString, rmonEventGroup
FROM RMON-MIB;
hcAlarmMIB MODULE-IDENTITY
LAST-UPDATED "200212160000Z"
ORGANIZATION "IETF RMONMIB Working Group"
CONTACT-INFO
" Andy Bierman
Cisco Systems, Inc.
Tel: +1 408 527-3711
Bierman & McCloghrie Standards Track [Page 6]
RFC 3434 High Capacity Alarm MIB December 2002
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 (C) 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 }
hcAlarmCapabilitiesObjects OBJECT IDENTIFIER
::= { 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
Bierman & McCloghrie Standards Track [Page 7]
RFC 3434 High Capacity Alarm MIB December 2002
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
--
hcAlarmTable OBJECT-TYPE
SYNTAX SEQUENCE OF HcAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of entries for the configuration of high capacity
alarms."
::= { hcAlarmControlObjects 1 }
hcAlarmEntry OBJECT-TYPE
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."
Bierman & McCloghrie Standards Track [Page 8]
RFC 3434 High Capacity Alarm MIB December 2002
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 }
hcAlarmIndex OBJECT-TYPE
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 }
hcAlarmInterval OBJECT-TYPE
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.
Bierman & McCloghrie Standards Track [Page 9]
RFC 3434 High Capacity Alarm MIB December 2002
This object may not be modified if the associated
hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 2 }
hcAlarmVariable OBJECT-TYPE
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 }
hcAlarmSampleType 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(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
Bierman & McCloghrie Standards Track [Page 10]
RFC 3434 High Capacity Alarm MIB December 2002
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 }
hcAlarmAbsValue OBJECT-TYPE
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 }
hcAlarmValueStatus OBJECT-TYPE
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 }
hcAlarmStartupAlarm 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
Bierman & McCloghrie Standards Track [Page 11]
RFC 3434 High Capacity Alarm MIB December 2002
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 }
hcAlarmRisingThreshAbsValueLo OBJECT-TYPE
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.
Bierman & McCloghrie Standards Track [Page 12]
RFC 3434 High Capacity Alarm MIB December 2002
This object may not be modified if the associated
hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 8 }
hcAlarmRisingThreshAbsValueHi OBJECT-TYPE
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 }
hcAlarmRisingThresholdValStatus OBJECT-TYPE
SYNTAX HcValueStatus
MAX-ACCESS read-create
STATUS current
Bierman & McCloghrie Standards Track [Page 13]
RFC 3434 High Capacity Alarm MIB December 2002
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 }
hcAlarmFallingThreshAbsValueLo OBJECT-TYPE
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.
Bierman & McCloghrie Standards Track [Page 14]
RFC 3434 High Capacity Alarm MIB December 2002
This object may not be modified if the associated
hcAlarmStatus object is equal to active(1)."
::= { hcAlarmEntry 11 }
hcAlarmFallingThreshAbsValueHi OBJECT-TYPE
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 }
hcAlarmFallingThresholdValStatus OBJECT-TYPE
SYNTAX HcValueStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
Bierman & McCloghrie Standards Track [Page 15]
RFC 3434 High Capacity Alarm MIB December 2002
"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 }
hcAlarmRisingEventIndex OBJECT-TYPE
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 }
hcAlarmFallingEventIndex OBJECT-TYPE
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 }
hcAlarmValueFailedAttempts OBJECT-TYPE
Bierman & McCloghrie Standards Track [Page 16]
RFC 3434 High Capacity Alarm MIB December 2002
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 }
hcAlarmOwner OBJECT-TYPE
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 }
hcAlarmStorageType OBJECT-TYPE
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 }
hcAlarmStatus OBJECT-TYPE
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 }
Bierman & McCloghrie Standards Track [Page 17]
RFC 3434 High Capacity Alarm MIB December 2002
--
-- Capabilities
--
hcAlarmCapabilities OBJECT-TYPE
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
--
hcAlarmNotifPrefix OBJECT IDENTIFIER
::= { hcAlarmNotifications 0 }
hcRisingAlarm NOTIFICATION-TYPE
OBJECTS { hcAlarmVariable,
hcAlarmSampleType,
hcAlarmAbsValue,
hcAlarmValueStatus,
hcAlarmRisingThreshAbsValueLo,
hcAlarmRisingThreshAbsValueHi,
hcAlarmRisingThresholdValStatus,
hcAlarmRisingEventIndex }
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
Bierman & McCloghrie Standards Track [Page 18]
RFC 3434 High Capacity Alarm MIB December 2002
clause are from the entry that causes this notification to
be generated."
::= { hcAlarmNotifPrefix 1 }
hcFallingAlarm NOTIFICATION-TYPE
OBJECTS { hcAlarmVariable,
hcAlarmSampleType,
hcAlarmAbsValue,
hcAlarmValueStatus,
hcAlarmFallingThreshAbsValueLo,
hcAlarmFallingThreshAbsValueHi,
hcAlarmFallingThresholdValStatus,
hcAlarmFallingEventIndex }
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 }
hcAlarmCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Describes the requirements for conformance to the High
Capacity Alarm MIB."
MODULE -- this module
MANDATORY-GROUPS {
hcAlarmControlGroup,
hcAlarmCapabilitiesGroup,
hcAlarmNotificationsGroup
}
MODULE RMON-MIB
MANDATORY-GROUPS { rmonEventGroup }
::= { hcAlarmCompliances 1 }
Bierman & McCloghrie Standards Track [Page 19]
RFC 3434 High Capacity Alarm MIB December 2002
-- Object Groups
hcAlarmControlGroup OBJECT-GROUP
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 }
hcAlarmCapabilitiesGroup OBJECT-GROUP
OBJECTS {
hcAlarmCapabilities
}
STATUS current
DESCRIPTION
"A collection of objects used to indicate an agent's high
capacity alarm threshold monitoring capabilities."
::= { hcAlarmGroups 2 }
hcAlarmNotificationsGroup NOTIFICATION-GROUP
NOTIFICATIONS {
hcRisingAlarm,
hcFallingAlarm
}
STATUS current
DESCRIPTION
"A collection of notifications to deliver information
related to a high capacity rising or falling threshold event
Bierman & McCloghrie Standards Track [Page 20]
RFC 3434 High Capacity Alarm MIB December 2002
to a management application."
::= { hcAlarmGroups 3 }
END
6. Intellectual Property
The IETF takes no position regarding the validity or scope of any
intellectual property or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; neither does it represent that it
has made any effort to identify any such rights. Information on the
IETF's procedures with respect to rights in standards-track and
standards-related documentation can be found in BCP-11. Copies of
claims of rights made available for publication and any assurances of
licenses to be made available, or the result of an attempt made to
obtain a general license or permission for the use of such
proprietary rights by implementors or users of this specification can
be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights which may cover technology that may be required to practice
this standard. Please address the information to the IETF Executive
Director.
7. Acknowledgements
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.
8. Normative References
[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.
Bierman & McCloghrie Standards Track [Page 21]
RFC 3434 High Capacity Alarm MIB December 2002
[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.
9. Informative References
[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.
10. Security Considerations
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
Bierman & McCloghrie Standards Track [Page 22]
RFC 3434 High Capacity Alarm MIB December 2002
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.
11. Authors' Addresses
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
Bierman & McCloghrie Standards Track [Page 23]
RFC 3434 High Capacity Alarm MIB December 2002
12. Full Copyright Statement
Copyright (C) The Internet Society (2002). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Bierman & McCloghrie Standards Track [Page 24]