|
Network Working Group Request for Comments: 3144 Category: Standards Track |
D. Romascanu Avaya, Inc. August 2001 |
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 (2001). All Rights Reserved.
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. The document proposes an extension to the Remote Monitoring MIB with a method of sorting the interfaces of a monitored device according to values of parameters specific to this interface.
1 Introduction
2 The SNMP Management Framework
3 Overview
4 MIB Structure
5 Evolution of the Document, Limitations and Future Work
6 Definitions
7 References
8 Intellectual Property
9 Security Considerations
10 Author's Address
11 Full Copyright Statement
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it defines a method of sorting the interfaces of a monitored device according to values of parameters specific to this interface.
This memo also includes a MIB module. This MIB module extends the list of managed objects specified in [RFC2819] and [RFC2613].
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMEND", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].
The SNMP Management Framework presently consists of five major components:
A more detailed introduction to the current SNMP Management Framework can be found in RFC 2570 [RFC2570].
Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI.
This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB.
This document continues the architecture created in the RMON MIB [RFC2819] and extended by the SMON MIB [RFC2613] by providing a method of ordering the interfaces of a device according to the value of a specific parameter that characterizes the interfaces.
The need for such a technique derives from the evolution of the network devices - bridges, routers, etc., into complex entities with a large number of interfaces and with many parameters that need to be monitored on each interface. It is common for certain classes of switching devices to contain hundred of ports, and for each port to instrument and support tens of parameters - usually expressed as counters - for each interface. As a result, it becomes impossible for applications that monitor these devices to provide a view that would allow the user to understand easily what is the status of the device, whether the behavior of a port or interface is in normal boundaries or not, and which are the most congested or problematic interfaces of the device.
This document tries to answer this problem by proposing a method of providing a sorted list of interfaces according to programmable criteria. The result of applying this method will be a shorter list, that includes the most significant interfaces sorted according to the selected criteria. One possible action that can be taken by a network manager could be applying to this interface a copy port operation to a destination port that has a dedicated monitoring device (e.g., a network analyzer) connected to it. A standard MIB interface for performing this operation is described in [RFC2613].
This MIB contains one MIB group:
- The interfaceTopNObjects
The interfaceTopNObjects includes one capability object and two tables:
- The interfaceControlTable
- The interfaceTopNTable
The interfaceControlTable is an RMON-style control table, allowing for the creation of interfaceTopN reports. The parameters specific for each report, like the duration of the report, the number of reports, start time and the characteristics of the variables that are sorted (absolute, 'deltas' or percentage of the total bandwidth) are set in this table. An optional operation that is controlled from this table is the normalization of values of the variables, which allows for sorting of variables on the interfaces, despite the basic speed of the interfaces being different on different interfaces.
The RMON MIB Working Group included in its Charter a MIB document that would offer a solution to the problem of quickly determining the most congested (highest utilized) physical ports and links in an RMON-capable device with multiple interfaces.
An initial solution, proposed in the first version of this document included a limited approach. The objects whose values are used as criteria for sorting are elements in tables indexed by an InterfaceIndex type of object, as defined in [RFC2863]. This approach simplifies the search algorithm and the result table, but restricts the method to interface parameters. A more generic ' usrTopN' function was initially considered out of the scope of this work.
At the Working Group meeting in Adelaide in March 2000, it was decided to try to define the more generic function of usrTopN. Under this approach, variables belonging to tables with any type of index can be sorted, but at expense of extra processing and sanity checking by the agent.
At the interim meeting of the RMON Working Group in San Francisco, in May 2000, it was decided that the usrTopN solution would not be continued in this phase of the work. One of the reasons is that it is difficult to achieve a normalization factor for a generic
approach. The group agreed it is not desirable to require the application to plug-in the scaling factor for every instance that might be included in a TopN report.
INTERFACETOPN-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, Gauge32
FROM SNMPv2-SMI
RowStatus, TimeStamp, TruthValue
FROM SNMPv2-TC
rmon, OwnerString
FROM RMON-MIB
CounterBasedGauge64
FROM HCNUM-TC
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF;
interfaceTopNMIB MODULE-IDENTITY
LAST-UPDATED "200103270000Z"
ORGANIZATION "IETF RMON MIB Working Group"
CONTACT-INFO
"
Dan Romascanu
Avaya Inc.
Tel: +972-3-645-8414
Email: dromasca@avaya.com"
DESCRIPTION
"The MIB module for sorting device interfaces for RMON and
SMON monitoring in a multiple device implementation."
::= { rmon 27 }
interfaceTopNObjects OBJECT IDENTIFIER ::= { interfaceTopNMIB 1 }
interfaceTopNNotifications OBJECT IDENTIFIER ::= { interfaceTopNMIB 2 }
interfaceTopNConformance OBJECT IDENTIFIER ::= { interfaceTopNMIB 3 }
-- The Interface Top N group is used to prepare reports that
-- describe a list of interfaces (data sources)
-- ordered by the values of one
-- of the objects that apply to the interfaces of the respective device.
-- Those objects are defined by standard MIBs. The exact objects that
-- are supported by the agent are described by interfaceTopNCaps
-- The objects must be elements in tables indexed only by an
-- InterfaceIndex object.
-- The objects chosen by the
-- management station may be sampled over a management
-- station-specified time interval, making the report rate based.
-- The management station also specifies the number of interfaces
-- that are reported.
--
-- The interfaceTopNControlTable is used to initiate the generation
-- of a report. The management station may select the parameters
-- of such a report, such as which object, how
-- many interfaces, and the start & stop times of the sampling. When
-- the report is prepared, entries are created in the
-- interfaceTopNTable associated with the relevant
-- interfaceTopNControlEntry. These entries are static for
-- each report after it has been prepared.
SYNTAX BITS {
ifInOctets(0),
ifInUcastPkts(1),
ifInNUcastPkts(2),
ifInDiscards(3),
ifInErrors(4),
ifInUnknownProtos(5),
ifOutOctets(6),
ifOutUcastPkts(7),
ifOutNUcastPkts(8),
ifOutDiscards(9),
ifOutErrors(10),
ifInMulticastPkts(11),
ifInBroadcastPkts(12),
ifOutMulticastPkts(13),
ifOutBroadcastPkts(14),
ifHCInOctets(15),
ifHCInUcastPkts(16),
ifHCInMulticastPkts(17),
ifHCInBroadcastPkts(18),
ifHCOutOctets(19),
ifHCOutUcastPkts(20),
ifHCOutMulticastPkts(21),
ifHCOutBroadcastPkts(22),
dot3StatsAlignmentErrors(23),
dot3StatsFCSErrors(24),
dot3StatsSingleCollisionFrames(25),
dot3StatsMultipleCollisionFrames(26),
dot3StatsSQETestErrors(27),
dot3StatsDeferredTransmissions(28),
dot3StatsLateCollisions(29),
dot3StatsExcessiveCollisions(30),
dot3StatsInternalMacTxErrors(31),
dot3StatsCarrierSenseErrors(32),
dot3StatsFrameTooLongs(33),
dot3StatsInternalMacRxErrors(34),
dot3StatsSymbolErrors(35),
dot3InPauseFrames(36),
dot3OutPauseFrames(37),
dot5StatsLineErrors(38),
dot5StatsBurstErrors(39),
dot5StatsACErrors(40),
dot5StatsAbortTransErrors(41),
dot5StatsInternalErrors(42),
dot5StatsLostFrameErrors(43),
dot5StatsReceiveCongestions(44),
dot5StatsFrameCopiedErrors(45),
dot5StatsTokenErrors(46),
dot5StatsSoftErrors(47),
dot5StatsHardErrors(48),
dot5StatsSignalLoss(49),
dot5StatsTransmitBeacons(50),
dot5StatsRecoverys(51),
dot5StatsLobeWires(52),
dot5StatsRemoves(53),
dot5StatsSingles(54),
dot5StatsFreqErrors(55),
etherStatsDropEvents(56),
etherStatsOctets(57),
etherStatsPkts(58),
etherStatsBroadcastPkts(59),
etherStatsMulticastPkts(60),
etherStatsCRCAlignErrors(61),
etherStatsUndersizePkts(62),
etherStatsOversizePkts(63),
etherStatsFragments(64),
etherStatsJabbers(65),
etherStatsCollisions(66),
etherStatsPkts64Octets(67),
etherStatsPkts65to127Octets(68),
etherStatsPkts128to255Octets(69),
etherStatsPkts256to511Octets(70),
etherStatsPkts512to1023Octets(71),
etherStatsPkts1024to1518Octets(72),
dot1dTpPortInFrames(73),
dot1dTpPortOutFrames(74),
dot1dTpPortInDiscards(75)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type(s) of sorting capabilities supported by the agent.
::= { interfaceTopNObjects 1 }
interfaceTopNControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF InterfaceTopNControlEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of control records for reports on the top `N'
interfaces for the value or rate of a selected object.
The number of entries depends on the configuration of the agent.
The maximum number of entries is implementation
dependent."
::= { interfaceTopNObjects 2 }
interfaceTopNControlEntry OBJECT-TYPE
SYNTAX InterfaceTopNControlEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of parameters that control the creation of a
report of the top N ports according to several metrics."
INDEX { interfaceTopNControlIndex }
::= { interfaceTopNControlTable 1 }
InterfaceTopNControlEntry ::= SEQUENCE {
interfaceTopNControlIndex
Integer32,
interfaceTopNObjectVariable
INTEGER,
interfaceTopNObjectSampleType
INTEGER,
interfaceTopNNormalizationReq
TruthValue,
interfaceTopNNormalizationFactor
Integer32,
interfaceTopNTimeRemaining
Integer32,
interfaceTopNDuration
Integer32,
interfaceTopNRequestedSize
Integer32,
interfaceTopNGrantedSize
Integer32,
interfaceTopNStartTime
TimeStamp,
interfaceTopNOwner
OwnerString,
interfaceTopNLastCompletionTime
TimeStamp,
interfaceTopNRowStatus
RowStatus
}
interfaceTopNControlIndex OBJECT-TYPE
SYNTAX Integer32 (1 .. 65535)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry in the
interfaceTopNControl table. Each such entry defines
one top N report prepared for a probe."
::= { interfaceTopNControlEntry 1 }
SYNTAX INTEGER {
ifInOctets(0),
ifInUcastPkts(1),
ifInNUcastPkts(2),
ifInDiscards(3),
ifInErrors(4),
ifInUnknownProtos(5),
ifOutOctets(6),
ifOutUcastPkts(7),
ifOutNUcastPkts(8),
ifOutDiscards(9),
ifOutErrors(10),
ifInMulticastPkts(11),
ifInBroadcastPkts(12),
ifOutMulticastPkts(13),
ifOutBroadcastPkts(14),
ifHCInOctets(15),
ifHCInUcastPkts(16),
ifHCInMulticastPkts(17),
ifHCInBroadcastPkts(18),
ifHCOutOctets(19),
ifHCOutUcastPkts(20),
ifHCOutMulticastPkts(21),
ifHCOutBroadcastPkts(22),
dot3StatsAlignmentErrors(23),
dot3StatsFCSErrors(24),
dot3StatsSingleCollisionFrames(25),
dot3StatsMultipleCollisionFrames(26),
dot3StatsSQETestErrors(27),
dot3StatsDeferredTransmissions(28),
dot3StatsLateCollisions(29),
dot3StatsExcessiveCollisions(30),
dot3StatsInternalMacTxErrors(31),
dot3StatsCarrierSenseErrors(32),
dot3StatsFrameTooLongs(33),
dot3StatsInternalMacRxErrors(34),
dot3StatsSymbolErrors(35),
dot3InPauseFrames(36),
dot3OutPauseFrames(37),
dot5StatsLineErrors(38),
dot5StatsBurstErrors(39),
dot5StatsACErrors(40),
dot5StatsAbortTransErrors(41),
dot5StatsInternalErrors(42),
dot5StatsLostFrameErrors(43),
dot5StatsReceiveCongestions(44),
dot5StatsFrameCopiedErrors(45),
dot5StatsTokenErrors(46),
dot5StatsSoftErrors(47),
dot5StatsHardErrors(48),
dot5StatsSignalLoss(49),
dot5StatsTransmitBeacons(50),
dot5StatsRecoverys(51),
dot5StatsLobeWires(52),
dot5StatsRemoves(53),
dot5StatsSingles(54),
dot5StatsFreqErrors(55),
etherStatsDropEvents(56),
etherStatsOctets(57),
etherStatsPkts(58),
etherStatsBroadcastPkts(59),
etherStatsMulticastPkts(60),
etherStatsCRCAlignErrors(61),
etherStatsUndersizePkts(62),
etherStatsOversizePkts(63),
etherStatsFragments(64),
etherStatsJabbers(65),
etherStatsCollisions(66),
etherStatsPkts64Octets(67),
etherStatsPkts65to127Octets(68),
etherStatsPkts128to255Octets(69),
etherStatsPkts256to511Octets(70),
etherStatsPkts512to1023Octets(71),
etherStatsPkts1024to1518Octets(72),
dot1dTpPortInFrames(73),
dot1dTpPortOutFrames(74),
dot1dTpPortInDiscards(75)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The particular variable to be sampled.
Values between 0 and 22, point to MIB objects defined in IF-MIB [RFC2863].
Values between 23 and 37, point to MIB objects defined in EtherLike-MIB [RFC2665].
Values between 38 and 55, point to MIB objects defined in TOKENRING-MIB [RFC1748].
Values between 56 and 72, point to MIB objects defined in RMON-MIB [RFC2819].
Values between 73 and 75, point to MIB objects defined in BRIDGE-MIB [RFC1493].
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 TopN
mechanism, the probe must only grant write access to this
object in those views that have read access to all objects on
the probe.
During a set operation, if the supplied variable name is not available in the selected MIB view, or does not conform the other conditions mentioned above, a badValue error must be returned.
This object may not be modified if the associated
interfaceTopNControlStatus object is equal to active(1)."
::= { interfaceTopNControlEntry 2 }
SYNTAX INTEGER {
absoluteValue(1),
deltaValue(2),
bandwidthPercentage(3)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The method of sampling the selected variable for storage in
the interfaceTopNTable.
If the value of this object is absoluteValue(1), the value of the selected variable will be copied directly into the topNValue.
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 will be stored in topNValue.
If the value of this object is bandwidthPercentage(3), the agent
records the total number of octets sent over an interval divided
by the total number of octets that represent '100% bandwidth'
for that interface. This ratio is multiplied by 1000 to
retain a 3 digit integer (0..1000) in units of
'tenth of one percent'. This type of computation is accurate for
the octet counters. The usage of this option with respect to
packets or error counters is not recommended.
This object may not be modified if the associated
interfaceTopNControlStatus object is equal to active(1)."
::= { interfaceTopNControlEntry 3 }
computation of the selected value.
If the value of this object is 'true', the value of
the selected variable will be multiplied by a factor equal to the
interfaceTopNNormalizationFactor divided by the value of
effective speed of the interface
If the value of this object is 'false',
the value of the selected variable will be taken 'as is' in
the TopN computation.
If the value of the object interfaceTopNSampleType is
bandwidthPercentage(3), the object
interfaceTopNNormalizationReq cannot take the value 'true'.
The value of this object MUST be false if the effective speed of the interface sub-layer as determined from ifSpeed is zero. This conforms to the ifSpeed definition in [RFC2863]for a sub-layer that has no concept of bandwidth.
This object may not be modified if the associated
interfaceTopNControlStatus object is equal to active(1)."
::= { interfaceTopNControlEntry 4 }
Example:
The following set of values is applied to a device with multiple
Ethernet interfaces running at 10 Mbps, 100 Mbps, and 1 Gbps.
interfaceTopNObjectVariable = 'ifInOctets' interfaceTopNObjectSampleType = 'deltaValue' interfaceTopNNormalizationReq = 'true' interfaceTopNNormalizationFactor = 1000000000 Applying this set of values will result in the sampled delta values to be multiplied by 100 for the 10 Mbps interfaces, and by 10 for the 100 Mbps interfaces, while the sample values for the 1 Gbps interface are left unchanged. The effective speed of the interface is taken from the value of ifSpeed for each interface, if ifSpeed is less than 4,294,967,295, or from ifHighSpeed multiplied by 1,000,000 otherwise.
At row creation the agent SHOULD set the value of this object to
the effective speed of the interface."
::= { interfaceTopNControlEntry 5 }
SYNTAX Integer32 (0..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The number of seconds left in the report
currently being collected. When this object
is modified by the management station, a new
collection is started, possibly aborting a
currently running report. The new value is
used as the requested duration of this report,
which is loaded into the associated
interfaceTopNDuration object.
When this object is set to a non-zero value,
any associated interfaceTopNEntries shall be
made inaccessible by the agent. While the value
of this object is non-zero, it decrements by one
per second until it reaches zero. During this
time, all associated interfaceTopNEntries shall
remain inaccessible. At the time that this object
decrements to zero, the report is made accessible
in the interfaceTopNTable. Thus, the interfaceTopN
table needs to be created only at the end of the
collection interval.
If the value of this object is set to zero
while the associated report is running, the
running report is aborted and no associated
interfaceTopNEntries are created."
DEFVAL { 0 }
::= { interfaceTopNControlEntry 6 }
interfaceTopNDuration OBJECT-TYPE
SYNTAX Integer32 (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds that this report has
collected during the last sampling interval,
or if this report is currently being collected,
the number of seconds that this report is being
collected during this sampling interval.
When the associated interfaceTopNTimeRemaining
object is set, this object shall be set by the
agent to the same value and shall not be modified
until the next time the interfaceTopNTimeRemaining
is set.
This value shall be zero if no reports have been
requested for this interfaceTopNControlEntry."
::= { interfaceTopNControlEntry 7 }
interfaceTopNRequestedSize OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum number of interfaces requested
for the Top N Table.
When this object is created or modified, the
agent should set interfaceTopNGrantedSize as close
to this object as is possible for the particular
implementation and available resources."
DEFVAL { 10 }
::= { interfaceTopNControlEntry 8 }
interfaceTopNGrantedSize OBJECT-TYPE
SYNTAX Integer32 (0.. 2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum number of interfaces in the
top N table.
When the associated interfaceTopNRequestedSize object is created or modified, the agent should set this object as closely to the requested value as is possible for the particular implementation and available resources. The agent must not lower this value except as a result of a set to the associated interfaceTopNRequestedSize object."
::= { interfaceTopNControlEntry 9 }
interfaceTopNStartTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime when this top N report was
last started. In other words, this is the time that
the associated interfaceTopNTimeRemaining object was
modified to start the requested report.
If the report has not yet been started, the value
of this object is zero."
::= { interfaceTopNControlEntry 10 }
interfaceTopNOwner OBJECT-TYPE
SYNTAX OwnerString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The entity that configured this entry and is
using the resources assigned to it."
::= { interfaceTopNControlEntry 11 }
interfaceTopNLastCompletionTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime when this top N report was
last completed. If no report was yet completed, the value
of this object is zero."
::= { interfaceTopNControlEntry 12 }
interfaceTopNRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this row.
If the value of this object is not equal to
active(1), all associated entries in the
interfaceTopNTable shall be deleted by the
agent."
::= { interfaceTopNControlEntry 13 }
-- Interface Top "N" reports
interfaceTopNTable OBJECT-TYPE
SYNTAX SEQUENCE OF InterfaceTopNEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of reports for the top `N' ports based on
setting of associated control table entries. The
maximum number of entries depends on the number
of entries in table interfaceTopNControlTable and
the value of object interfaceTopNGrantedSize for
each entry.
For each entry in the interfaceTopNControlTable,
interfaces with the highest value of
interfaceTopNValue shall be placed in this table
in decreasing order of that rate until there is
no more room or until there are no more ports."
::= { interfaceTopNObjects 3 }
interfaceTopNEntry OBJECT-TYPE
SYNTAX InterfaceTopNEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of statistics for an interface that is
part of a top N report."
INDEX { interfaceTopNControlIndex,
interfaceTopNIndex }
::= { interfaceTopNTable 1 }
InterfaceTopNEntry ::= SEQUENCE {
interfaceTopNIndex
Integer32,
interfaceTopNDataSourceIndex
Integer32,
interfaceTopNValue
Gauge32,
interfaceTopNValue64
CounterBasedGauge64
}
interfaceTopNIndex OBJECT-TYPE
SYNTAX Integer32 (1..65535)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An index that uniquely identifies an entry in
the interfaceTopN table among those in the same
report. This index is between 1 and N, where N
is the number of entries in this report. Increasing
values of interfaceTopNIndex shall be assigned to
entries with decreasing values of interfaceTopNValue
or interfaceTopNValue64, whichever applies,
until index N is assigned to the entry with the
lowest value of interfaceTopNValue /
interfaceTopNValue64 or there are no
more interfaceTopNEntries.
No ports are included in a report where their
value of interfaceTopNValue would be zero."
::= { interfaceTopNEntry 1 }
interfaceTopNDataSourceIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object identifies the index corresponding
to the dataSource for this entry.
For sorted values of variables belonging to the
IF-MIB, EtherLike-MIB or TOKENRING-MIB, this value
equals the ifIndex of the interface.
For sorted values of variables belonging to the
RMON-MIB, this value equals the interface corresponding
to the data source, pointed to by the value
of etherStatsDataSource.
For sorted values of variables belonging to the
BRIDGE-MIB, this value equals the interface corresponding
to the bridge port, pointed to by the value
of dot1dBasePortIfIndex."
::= { interfaceTopNEntry 2 }
interfaceTopNValue OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value at the end of the sampling interval, or
the amount of change in the selected variable
during this sampling interval for the identified
interface. The selected variable is that interfaces's
instance of the object selected by
interfaceTopNObjectVariable. This value may be normalized
if interfaceTopNNormalization required equals 'true'.
This value of this object will be computed for all
cases when interfaceTopNObjectVariable points to a
32-bit counter or Gauge or when
interfaceTopNObjectSampleType equals bandwidthPercentage(3),
and will be zero for all other cases."
::= { interfaceTopNEntry 3 }
interfaceTopNValue64 OBJECT-TYPE
SYNTAX CounterBasedGauge64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value at the end of the sampling interval, or
the amount of change in the selected variable
during this sampling interval for the identified
interface. The selected variable is that interfaces's
instance of the object selected by
interfaceTopNObjectVariable. This value may be normalized
if interfaceTopNNormalization required equals 'true'.
This value of this object will be computed for all
cases when interfaceTopNObjectVariable points to
a 64-bit counter, and will be zero for all other cases."
::= { interfaceTopNEntry 4 }
--
-- Notifications Section
-- (none defined)
-- --
-- Conformance Section
--
interfaceTopNCompliances OBJECT IDENTIFIER ::=
{interfaceTopNConformance 1 }
interfaceTopNGroups OBJECT IDENTIFIER ::=
{interfaceTopNConformance 2 }
::= { interfaceTopNCompliances 1 }
OBJECTS {
interfaceTopNCaps,
interfaceTopNObjectVariable,
interfaceTopNObjectSampleType,
interfaceTopNNormalizationReq,
interfaceTopNNormalizationFactor,
interfaceTopNTimeRemaining,
interfaceTopNDuration,
interfaceTopNRequestedSize,
interfaceTopNGrantedSize,
interfaceTopNStartTime,
interfaceTopNOwner,
interfaceTopNLastCompletionTime,
interfaceTopNRowStatus,
interfaceTopNDataSourceIndex,
interfaceTopNValue,
interfaceTopNValue64
}
STATUS current
DESCRIPTION
"A collection of objects providing interfaceTopN data for
a multiple interfaces device."
::= { interfaceTopNGroups 1 }
[RFC2571] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2571, April 1999.
[RFC1155] Rose, M., and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", STD 16, RFC 1155, May 1990.
[RFC1212] Rose, M., and K. McCloghrie, "Concise MIB Definitions", STD 16, RFC 1212, March 1991.
[RFC1215] M. Rose, "A Convention for Defining Traps for use with the SNMP", RFC 1215, March 1991.
[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", STD 58, RFC 2580, April 1999.
[RFC1157] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network Management Protocol", STD 15, RFC 1157, May 1990.
[RFC1901] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, January 1996.
[RFC1906] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, January 1996.
[RFC2572] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2572, April 1999.
[RFC2574] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2574, April 1999.
[RFC1905] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996.
[RFC2573] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC 2573, April 1999.
[RFC2575] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2575, April 1999.
[RFC2570] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction to Version 3 of the Internet-standard Network Management Framework", RFC 2570, April 1999.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2819] Waldbusser, S., "Remote Network Monitoring Management Information Base", STD 59, RFC 2819, May 2000.
[RFC2613] Waterman, R., Lahaye, B., Romascanu, D., and S. Waldbusser, "Remote Network Monitoring MIB Extensions for Switched Networks, Version 1.0", RFC 2613, June 1999.
[RFC1213] McCloghrie, K., and M. Rose, Editors, "Management Information Base for Network Management of TCP/IP-based internets: MIB-II", STD 17, RFC 1213, March 1991.
[RFC2863] McCloghrie, K., and Kastenholtz, F., "The Interfaces Group MIB", RFC 2863, June 2000.
[RFC2982] Kavasseri, R., Stewart B., "Distributed Management Expression MIB", RFC 2982, October 2000
[RFC2856] Bierman, A., McCloghrie, K., and Presuhn R., "Textual Conventions for Additional High Capacity Data Types", RFC 2856, June 2000.
[RFC2665] Flick, J., and Johnson, J., "Definitions of Managed Objects for the Ethernet-like Interface Types", RFC 2665, August 1999.
[RFC1748] McCloghrie, K., and Decker E., "IEEE802.5 MIB Using SMIv2", RFC 1748, December 1994.
[RFC1493] E. Decker, P. Langille, A. Rijsinghani, and McCloghrie, K., "Definition of Managed Objects for Bridges", RFC 1493, July 1993.
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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:
interfaceTopNDataSourceIndex
interfaceTopNValue
It is thus important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment.
SNMPv1 by itself is not a secure environment. Even if the network itself is secure (for example by using IPSec), even then, 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 implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model [RFC2274] and the View-based Access Control Model [RFC2275] 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 the objects only to those principals
(users) that have legitimate rights to indeed GET or SET
(change/create/delete) them.
Dan Romascanu
Avaya Inc.
Atidim Technology Park, Bldg. #3
Tel Aviv, 61131
Israel
Phone: +972-3-645-8414
EMail: dromasca@avaya.com
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