Network Working Group D. Romascanu

Network Working Group D. Romascanu
Request for Comments: 3144 Avaya, Inc.
Category: Standards Track August 2001

Remote Monitoring MIB Extensions for
Interface Parameters Monitoring

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 (2001). 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.
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.

Table of Contents

1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . 2
2 The SNMP Management Framework . . . . . . . . . . . . . . . 2
3 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 MIB Structure . . . . . . . . . . . . . . . . . . . . . . . 4
5 Evolution of the Document, Limitations and Future Work. . . 4
6 Definitions . . . . . . . . . . . . . . . . . . . . . . . . 5
7 References. . . . . . . . . . . . . . . . . . . . . . . . . 26
8 Intellectual Property . . . . . . . . . . . . . . . . . . . 28
9 Security Considerations . . . . . . . . . . . . . . . . . . 29
10 Author's Address . . . . . . . . . . . . . . . . . . . . . 29
11 Full Copyright Statement . . . . . . . . . . . . . . . . . 30

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1. Introduction

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].

2. The SNMP Management Framework

The SNMP Management Framework presently consists of five major
components:

o An overall architecture, described in RFC 2571 [RFC2571].

o Mechanisms for describing and naming objects and events for the
purpose of management. The first version of this Structure of
Management Information (SMI) is called SMIv1 and described in
STD 16, RFC 1155 [RFC1155], STD 16, RFC 1212 [RFC1212] and RFC
1215 [RFC1215]. The second version, called SMIv2, is described
in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and
STD 58, RFC 2580 [RFC2580].

o Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC 1157 [RFC1157]. A second version of
the SNMP message protocol, which is not an Internet standards
track protocol, is called SNMPv2c and described in RFC 1901
[RFC1901] and RFC 1906 [RFC1906]. The third version of the
message protocol is called SNMPv3 and described in RFC 1906
[RFC1906], RFC 2572 [RFC2572] and RFC 2574 [RFC2574].

o Protocol operations for accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC 1157 [RFC1157]. A second set of
protocol operations and associated PDU formats is described in
RFC 1905 [RFC1905].

o A set of fundamental applications described in RFC 2573
[RFC2573] and the view-based access control mechanism described
in RFC 2575 [RFC2575].

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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.

3. Overview

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].

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4. MIB Structure

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.

5. Evolution of the Document, Limitations and Future Work

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

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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.

6. Definitions

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: [email protected]"

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

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-- 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.

interfaceTopNCaps OBJECT-TYPE
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),

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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

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"The type(s) of sorting capabilities supported by the agent.

If the agent can perform sorting of interfaces according to the
values of ifInOctets, as defined in [RFC2863],
then the 'ifInOctets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifInUcastPkts, as defined in [RFC2863],
then the 'ifInUcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifInNUcastPkts, as defined in [RFC2863],
then the 'ifInNUcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifInDiscards, as defined in [RFC2863],
then the 'ifInDiscards' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifInErrors, as defined in [RFC2863],
then the 'ifInErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifInUnknownProtocols, as defined in [RFC2863],
then the 'ifInUnknownProtocols' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifOutOctets, as defined in [RFC2863],
then the 'ifOutOctets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifOutUcastPackets, as defined in [RFC2863],
then the 'ifOutUcastPackets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifOutNUcastPackets, as defined in [RFC2863],
then the 'ifOutNUcastPackets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifOutDiscards, as defined in [RFC2863],
then the 'ifOutDiscards' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifOutErrors, as defined in [RFC2863],
then the 'ifOutErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifInMulticastPkts, as defined in [RFC2863],

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then the 'ifInMulticastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifInBroadcastPkts, as defined in [RFC2863],
then the 'ifInBroadcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifOutMulticastPkts, as defined in [RFC2863],
then the 'ifOutMulticastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifOutBroadcastPkts, as defined in [RFC2863],
then the 'ifOutBroadcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifHCInOctets, as defined in [RFC2863],
then the 'ifHCInOctets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifHCInMulticastPkts, as defined in [RFC2863],
then the 'ifHCInMulticastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifHCInBroadcastPkts, as defined in [RFC2863],
then the 'ifHCInBroadcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifHCOutOctets, as defined in [RFC2863],
then the 'ifHCOutOctets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifHCOutUcastPkts, as defined in [RFC2863],
then the 'ifHCOutUcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifHCOutMulticastPkts, as defined in [RFC2863],
then the 'ifHCOutMulticastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of ifHCOutBroadcastPkts, as defined in [RFC2863],
then the 'ifHCOutBroadcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsAlignmentErrors, as defined in [RFC2665],
then the 'dot3StatsAlignmentErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsFCSErrors, as defined in [RFC2665],

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then the 'dot3StatsFCSErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsSingleCollisionFrames, as defined in
[RFC2665],then the 'dot3StatsSingleCollisionFrames' bit will
be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsSQETestErrors, as defined in [RFC2665],
then the 'dot3StatsSQETestErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsDeferredTransmissions, as defined in
[RFC2665], then the 'dot3StatsDeferredTransmissions' bit
will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsLateCollisions, as defined in [RFC2665],
then the 'dot3StatsLateCollisions' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsExcessiveCollisions, as defined in [RFC2665],
then the 'dot3StatsExcessiveCollisions' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsInternalMacTxErrors, as defined in
[RFC2665],then the 'dot3StatsInternalMacTxErrors' bit
will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsCarrierSenseErrors, as defined in [RFC2665],
then the 'dot3StatsCarrierSenseErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsFrameTooLongs, as defined in [RFC2665],
then the 'dot3StatsFrameTooLongs' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsInternalMacRxErrors, as defined in
[RFC2665], then the 'dot3StatsInternalMacRxErrors' bit
will be set.

If the agent can perform sorting of interfaces according to the
values of dot3StatsSymbolErrors, as defined in [RFC2665],
then the 'dot3StatsSymbolErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3InPauseFrames, as defined in [RFC2665],

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then the 'dot3InPauseFrames' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot3OutPauseFrames, as defined in [RFC2665],
then the 'dot3OutPauseFrames' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsLineErrors, as defined in [RFC1748],
then the 'dot5StatsLineErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsBurstErrors, as defined in [RFC1748],
then the 'dot5StatsBurstErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsACErrors, as defined in [RFC1748],
then the 'dot5StatsACErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsAbortTransErrors, as defined in [RFC1748],
then the 'dot5StatsAbortTransErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsInternalErrors, as defined in [RFC1748],
then the 'dot5StatsInternalErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsLostFrameErrors, as defined in [RFC1748],
then the 'dot5StatsLostFrameErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsReceiveCongestionErrors, as defined in
[RFC1748], then the 'dot5StatsReceiveCongestionErrors' bit will
be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsFrameCopiedErrors, as defined in [RFC1748],
then the 'dot5StatsFrameCopiedErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsTokenErrors, as defined in [RFC1748],
then the 'dot5StatsTokenErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsSoftErrors, as defined in [RFC1748],
then the 'dot5StatsSoftErrors' bit will be set.

If the agent can perform sorting of interfaces according to the

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values of dot5StatsHardErrors, as defined in [RFC1748],
then the 'dot5StatsHardErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsSignalLoss, as defined in [RFC1748],
then the 'dot5StatsSignalLoss' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsTransmitBeacons, as defined in [RFC1748],
then the 'dot5StatsTransmitBeacons' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsRecoverys, as defined in [RFC1748],
then the 'dot5StatsRecoverys' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsLobeWires, as defined in [RFC1748],
then the 'dot5StatsLobeWires' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsRemoves, as defined in [RFC1748],
then the 'dot5StatsRemoves' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsSingles, as defined in [RFC1748],
then the 'dot5StatsSingles' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot5StatsFreqErrors, as defined in [RFC1748],
then the 'dot5StatsFreqErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsDropEvents, as defined in [RFC2819],
then the 'etherStatsDropEvents' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsOctets, as defined in [RFC2819],
then the 'etherStatsOctets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsPkts, as defined in [RFC2819],
then the 'etherStatsPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsBroadcastPkts, as defined in [RFC2819],
then the 'etherStatsBroadcastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the

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values of etherStatsMulticastPkts, as defined in [RFC2819],
then the 'etherStatsMulticastPkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsCRCAlignErrors, as defined in [RFC2819],
then the 'etherStatsCRCAlignErrors' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsUndersizePkts, as defined in [RFC2819],
then the 'etherStatsUndersizePkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsOversizePkts, as defined in [RFC2819],
then the 'etherStatsOversizePkts' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsFragments, as defined in [RFC2819],
then the 'etherStatsFragments' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsJabbers, as defined in [RFC2819],
then the 'etherStatsJabbers' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsCollisions, as defined in [RFC2819],
then the 'etherStatsCollisions' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsPkts64Octets, as defined in [RFC2819],
then the 'etherStatsPkts64Octets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsPkts65to127Octets, as defined in [RFC2819],
then the 'etherStatsPkts65to127Octets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsPkts128to255Octets, as defined in [RFC2819],
then the 'etherStatsPkts128to255Octets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsPkts256to511Octets, as defined in [RFC2819],
then the 'etherStatsPkts256to511Octets' bit will be set.

If the agent can perform sorting of interfaces according to the
values of etherStatsPkts512to1023Octets, as defined in [RFC2819],
then the 'etherStatsPkts512to1023Octets' bit will be set.

If the agent can perform sorting of interfaces according to the

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values of etherStatsPkts1024to1518Octets, as defined in
[RFC2819], then the 'etherStatsPkts1024to1518Octets' bit will
be set.

If the agent can perform sorting of interfaces according to the
values of dot1dTpPortInFrames, as defined in [RFC1493],
then the 'dot1dTpPortInFrames' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot1dTpPortOutFrames, as defined in [RFC1493],
then the 'dot1dTpPortOutFrames' bit will be set.

If the agent can perform sorting of interfaces according to the
values of dot1dTpPortInDiscards, as defined in [RFC1493],
then the 'dot1dTpPortInDiscards' bit will be set."

::= { 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,

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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 }

interfaceTopNObjectVariable OBJECT-TYPE
SYNTAX INTEGER {
ifInOctets(0),
ifInUcastPkts(1),
ifInNUcastPkts(2),
ifInDiscards(3),
ifInErrors(4),
ifInUnknownProtos(5),
ifOutOctets(6),
ifOutUcastPkts(7),
ifOutNUcastPkts(8),
ifOutDiscards(9),
ifOutErrors(10),

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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),

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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.

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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 }

interfaceTopNObjectSampleType OBJECT-TYPE
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 }

interfaceTopNNormalizationReq OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates whether normalization is required in the

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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 }

interfaceTopNNormalizationFactor OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value used for normalization if
interfaceTopNNormalizationReq has the value 'true'.

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

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RFC 3144 Remote Monitoring MIB Extensions August 2001

the effective speed of the interface."
::= { interfaceTopNControlEntry 5 }

interfaceTopNTimeRemaining OBJECT-TYPE
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

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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

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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

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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."

Romascanu Standards Track [Page 24]

RFC 3144 Remote Monitoring MIB Extensions August 2001

::= { 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 }

interfaceTopNCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Describes the requirements for conformance to the
InterfaceTopN MIB."
MODULE -- this module
MANDATORY-GROUPS { interfaceTopNGroup }
::= { interfaceTopNCompliances 1 }

interfaceTopNGroup OBJECT-GROUP
OBJECTS {
interfaceTopNCaps,
interfaceTopNObjectVariable,
interfaceTopNObjectSampleType,

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RFC 3144 Remote Monitoring MIB Extensions August 2001

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 }

END

7. References

[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.

Romascanu Standards Track [Page 26]

RFC 3144 Remote Monitoring MIB Extensions August 2001

[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.

Romascanu Standards Track [Page 27]

RFC 3144 Remote Monitoring MIB Extensions August 2001

[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.

8. 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.

Romascanu Standards Track [Page 28]

RFC 3144 Remote Monitoring MIB Extensions August 2001

9. 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:

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.

10. Author's Address

Dan Romascanu
Avaya Inc.
Atidim Technology Park, Bldg. #3
Tel Aviv, 61131
Israel

Phone: +972-3-645-8414
EMail: [email protected]

Romascanu Standards Track [Page 29]

RFC 3144 Remote Monitoring MIB Extensions August 2001

11. Full Copyright Statement

Copyright (C) The Internet Society (2001). 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.

Romascanu Standards Track [Page 30]