rfc2819.txt

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Network Working Group                                       S. Waldbusser
Request for Comments: 2819                            Lucent Technologies
STD: 59                                                          May 2000
Obsoletes: 1757
Category: Standards Track


         Remote Network Monitoring Management Information Base

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 (2000).  All Rights Reserved.

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in TCP/IP-based internets.
   In particular, it defines objects for managing remote network
   monitoring devices.

   This memo obsoletes RFC 1757. This memo extends that specification by
   documenting the RMON MIB in SMIv2 format while remaining semantically
   identical to the existing SMIv1-based MIB.




















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Table of Contents

   1 The SNMP Management Framework ..............................   2
   2 Overview ...................................................   3
   2.1 Remote Network Management Goals ..........................   4
   2.2 Textual Conventions ......................................   5
   2.3 Structure of MIB .........................................   5
   2.3.1 The Ethernet Statistics Group ..........................   6
   2.3.2 The History Control Group ..............................   6
   2.3.3 The Ethernet History Group .............................   6
   2.3.4 The Alarm Group ........................................   7
   2.3.5 The Host Group .........................................   7
   2.3.6 The HostTopN Group .....................................   7
   2.3.7 The Matrix Group .......................................   7
   2.3.8 The Filter Group .......................................   7
   2.3.9 The Packet Capture Group ...............................   8
   2.3.10 The Event Group .......................................   8
   3 Control of Remote Network Monitoring Devices ...............   8
   3.1  Resource  Sharing  Among Multiple Management Stations ...   9
   3.2 Row Addition Among Multiple Management Stations ..........  10
   4 Conventions ................................................  11
   5 Definitions ................................................  12
   6 Security Considerations ....................................  94
   7 Acknowledgments ............................................  95
   8 Author's Address ...........................................  95
   9 References .................................................  95
   10 Intellectual Property .....................................  97
   11 Full Copyright Statement ..................................  98

1.  The SNMP Management Framework

   The SNMP Management Framework presently consists of five major
   components:

   o  An overall architecture, described in RFC 2571 [1].

   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 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The
      second version, called SMIv2, is described in STD 58, RFC 2578
      [5], RFC 2579 [6] and RFC 2580 [7].

   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 [8]. A second version of the SNMP
      message protocol, which is not an Internet standards track
      protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC



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      1906 [10]. The third version of the message protocol is called
      SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and RFC 2574
      [12].

   o  Protocol operations for accessing management information. The
      first set of protocol operations and associated PDU formats is
      described in STD 15, RFC 1157 [8]. A second set of protocol
      operations and associated PDU formats is described in RFC 1905
      [13].

   o  A set of fundamental applications described in RFC 2573 [14] and
      the view-based access control mechanism described in RFC 2575
      [15].

   A more detailed introduction to the current SNMP Management Framework
   can be found in RFC 2570 [22].

   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.

2.  Overview

   Remote network monitoring devices, often called monitors or probes,
   are instruments that exist for the purpose of managing a network.
   Often these remote probes are stand-alone devices and devote
   significant internal resources for the sole purpose of managing a
   network.  An organization may employ many of these devices, one per
   network segment, to manage its internet.  In addition, these devices
   may be used for a network management service provider to access a
   client network, often geographically remote.

   The objects defined in this document are intended as an interface
   between an RMON agent and an RMON management application and are not
   intended for direct manipulation by humans.  While some users may
   tolerate the direct display of some of these objects, few will





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   tolerate the complexity of manually manipulating objects to
   accomplish row creation.  These functions should be handled by the
   management application.

   While most of the objects in this document are suitable for the
   management of any type of network, there are some which are specific
   to managing Ethernet networks.  These are the objects in the
   etherStatsTable, the etherHistoryTable, and some attributes of the
   filterPktStatus and capturBufferPacketStatus objects.  The design of
   this MIB allows similar objects to be defined for other network
   types.  It is intended that future versions of this document and
   additional documents will define extensions for other network types.

   There are a number of companion documents to the RMON MIB. The Token
   Ring RMON MIB [19] provides objects specific to managing Token Ring
   networks. The RMON-2 MIB [20] extends RMON by providing RMON analysis
   up to the application layer. The SMON MIB [21] extends RMON by
   providing RMON analysis for switched networks.

2.1.  Remote Network Management Goals

   o  Offline Operation
        There are sometimes conditions when a management station will
        not be in constant contact with its remote monitoring devices.
        This is sometimes by design in an attempt to lower
        communications costs (especially when communicating over a WAN
        or dialup link), or by accident as network failures affect the
        communications between the management station and the probe.

        For this reason, this MIB allows a probe to be configured to
        perform diagnostics and to collect statistics continuously, even
        when communication with the management station may not be
        possible or efficient.  The probe may then attempt to notify the
        management station when an exceptional condition occurs.  Thus,
        even in circumstances where communication between management
        station and probe is not continuous, fault, performance, and
        configuration information may be continuously accumulated and
        communicated to the management station conveniently and
        efficiently.

   o  Proactive Monitoring
        Given the resources available on the monitor, it is potentially
        helpful for it continuously to run diagnostics and to log
        network performance.  The monitor is always available at the
        onset of any failure.  It can notify the management station of
        the failure and can store historical statistical information





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        about the failure.  This historical information can be played
        back by the management station in an attempt to perform further
        diagnosis into the cause of the problem.

   o  Problem Detection and Reporting
        The monitor can be configured to recognize conditions, most
        notably error conditions, and continuously to check for them.
        When one of these conditions occurs, the event may be logged,
        and management stations may be notified in a number of ways.

   o  Value Added Data
        Because a remote monitoring device represents a network resource
        dedicated exclusively to network management functions, and
        because it is located directly on the monitored portion of the
        network, the remote network monitoring device has the
        opportunity to add significant value to the data it collects.
        For instance, by highlighting those hosts on the network that
        generate the most traffic or errors, the probe can give the
        management station precisely the information it needs to solve a
        class of problems.

   o  Multiple Managers
        An organization may have multiple management stations for
        different units of the organization, for different functions
        (e.g. engineering and operations), and in an attempt to provide
        disaster recovery.  Because environments with multiple
        management stations are common, the remote network monitoring
        device has to deal with more than own management station,
        potentially using its resources concurrently.

2.2.  Textual Conventions

   Two new data types are introduced as a textual convention in this MIB
   document, OwnerString and EntryStatus.

2.3.  Structure of MIB

   The objects are arranged into the following groups:

         - ethernet statistics

         - history control

         - ethernet history

         - alarm

         - host



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         - hostTopN

         - matrix

         - filter

         - packet capture

         - event

   These groups are the basic unit of conformance.  If a remote
   monitoring device implements a group, then it must implement all
   objects in that group.  For example, a managed agent that implements
   the host group must implement the hostControlTable, the hostTable and
   the hostTimeTable. While this section provides an overview of
   grouping and conformance information for this MIB, the authoritative
   reference for such information is contained in the MODULE-COMPLIANCE
   and OBJECT-GROUP macros later in this MIB.

   All groups in this MIB are optional.  Implementations of this MIB
   must also implement the system group of MIB-II [16] and the IF-MIB
   [17].  MIB-II may also mandate the implementation of additional
   groups.

   These groups are defined to provide a means of assigning object
   identifiers, and to provide a method for implementors of managed
   agents to know which objects they must implement.

2.3.1.  The Ethernet Statistics Group

   The ethernet statistics group contains statistics measured by the
   probe for each monitored Ethernet interface on this device.  This
   group consists of the etherStatsTable.

2.3.2.  The History Control Group

   The history control group controls the periodic statistical sampling
   of data from various types of networks.  This group consists of the
   historyControlTable.

2.3.3.  The Ethernet History Group

   The ethernet history group records periodic statistical samples from
   an ethernet network and stores them for later retrieval.  This group
   consists of the etherHistoryTable.