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                               Definitions of Tests
                                for ATM Management
          
                                  April 7, 1999
          
                 Internet-Draft <draft-ietf-atommib-test-05.txt>
          
                              Michael Noto (editor)
                                 3Com Corporation
                                mike_noto@3com.com
          
                               Kaj Tesink (editor)
                              Telcordia Technologies
                            kaj@research.telcordia.com
          
          
          
          
          
          
          1.  Status of this Memo
          
          This document is an Internet-Draft and is in full conformance
          with all provisions of Section 10 of RFC2026.
          
          Internet-Drafts are working documents of the Internet
          Engineering Task Force (IETF), its areas, and its working
          groups.  Note that other groups may also distribute working
          documents as Internet-Drafts.
          
          Internet-Drafts are draft documents valid for a maximum of six
          months and may be updated, replaced, or obsoleted by other
          documents at any time.  It is inappropriate to use Internet-
          Drafts as reference material or to cite them other than as
          "work in progress."
          
          The list of current Internet-Drafts can be accessed at
          http://www.ietf.org/ietf/1id-abstracts.txt
          
          The list of Internet-Draft Shadow Directories can be accessed
          at http://www.ietf.org/shadow.html.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          Copyright Notice
          
          Copyright (C) The Internet Society (1999).  All Rights
          Reserved.
          
          2.  Abstract
          
          This memo defines a portion of the Management Information Base
          (MIB) for use with network management protocols in the
          Internet community.  In particular, it describes objects used
          for managing ATM-based interfaces, devices, networks and
          services in addition to those defined in the ATM MIB [16], to
          provide support for the management of on-demand ATM Loopback
          Tests.
          
          
          3.  The SNMP Network Management Framework
          
          The SNMP Management Framework presently consists of five major
          components:
          
          0    An overall architecture, described in RFC 2271 [1].
          
          0    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 RFC 1155 [2], RFC 1212 [3] and RFC 1215
               [4].  The second version, called SMIv2, is described in
               RFC 1902 [5], RFC 1903 [6] and RFC 1904 [7].
          
          0    Message protocols for transferring management
               information.  The first version of the SNMP message
               protocol is called SNMPv1 and described in 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 1906 [10].
               The third version of the message protocol is called
               SNMPv3 and described in RFC 1906 [10], RFC 2272 [11] and
               RFC 2274 [12].
          
          0    Protocol operations for accessing management information.
               The first set of protocol operations and associated PDU
               formats is described in RFC 1157 [8].  A second set of
               protocol operations and associated PDU formats is
               described in RFC 1905 [13].
          
          
          
          
          
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          0    A set of fundamental applications described in RFC 2273
               [14] and the view-based access control mechanism
               described in RFC 2275 [15].
          
          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 (e.g.,
          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.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          4.  Overview
          
          The purpose of this memo is to provide additional
          capabilities, not found in the ATM MIB [16], which are needed
          to manage ATM interfaces.  This memo addresses ATM Testing
          Support and must be used in conjunction with the
          System/Interface Test MIB [22].
          
          
          4.1.  Background
          
          In addition to the MIB module defined in this memo, other MIB
          modules are necessary to manage ATM interfaces, links and
          cross-connects.  Examples include MIB II for general system
          [17] and interface management [18], the DS3 or SONET/SDH MIBs
          for management of SONET/SDH and DS3 physical interfaces, and,
          as appropriate, MIB modules for applications that make use of
          ATM, such as SMDS and LAN Emulation.  These MIB modules are
          outside the scope of this specification.
          
          This MIB module requires the use of the ATM MIB module defined
          in [16] and the System/Interface Test MIB module [22].
          
          This memo defines extensions to the ATM MIB in order to
          support ATM Loopback Tests. An ATM Loopback Test provides the
          ability to send out a loopback OAM (Operations and
          Maintenance) cell to verify the existence of connectivity for
          a particular connection.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          4.2.  Terminology
          
          The following terms are defined here and used throughout this
          MIB:
               - Virtual Path Link (VPL)
               - Virtual Path Connection (VPC)
               - Virtual Path Segment (VP Segment)
               - Virtual Channel Link (VCL)
               - Virtual Channel Connection (VCC)
               - Virtual Channel Segment (VC Segment).
          
          
            _____      _______      _______      _______      _____
           |     |____|       |____|       |____|       |____|     |
           |Host1|    |SwitchA|    |SwitchB|    |SwitchC|    |Host2|
           |     |____|       |____|       |____|       |____|     |
           |_____|    |_______|    |_______|    |_______|    |_____|
          
               |<----->| Virtual          |<----->| Virtual
                         Path Link                  Path Link
          
          
               |<------------Virtual Path Connection---------->|
                             (between Host1 and Host2)
          
          
                              |<--------------->| Virtual Path
                                                  Segment (between
                                                  SwitchA and SwitchC)
          
             Figure 1: Examples of Virtual Path Links, Virtual Path
                       Connection, and Virtual Path Segment
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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            _____      _______      _______      _______      _____
           |     |____|       |____|       |____|       |____|     |
           |Host1|----|SwitchA|----|SwitchB|----|SwitchC|----|Host2|
           |     |____|       |____|       |____|       |____|     |
           |_____|    |_______|    |_______|    |_______|    |_____|
          
               |<----->| Virtual          |<----->| Virtual
                         Channel Link               Channel Link
          
          
               |<----------Virtual Channel Connection--------->|
                           (between Host1 and Host2)
          
          
                              |<--------------->| Virtual Channel
                                                  Segment (between
                                                  SwitchA and SwitchC)
          
          Figure 2: Examples of Virtual Channel Links, Virtual
                    Channel Connection, and Virtual Channel Segment
          
          
          4.3.  Supported Functions
          
          The managed ATM objects are organized as follows:
          
                (1) ATM Loopback Testing
                (2) ATM End-Point Tables
          
          4.3.1.  ATM Loopback Testing
          
          The loopback test provides the ability to send out a loopback
          OAM cell to verify the existence of connectivity for a
          particular connection.  Loopback tests can be performed on
          either an entire connection (i.e., an end-to-end test), a
          segment of the connection (i.e., a segment test), a portion of
          a segment (i.e., a loopback location identifier test), or the
          network portion of a connection (i.e., a service internal
          test).
          
          The loopback test makes use of the Test Table defined in [22].
          For a given interface, a loopback test can be invoked by
          obtaining ownership of a test and then by setting the value of
          testType equal to one of the ATM Loopback Test Types defined
          in Section 5. See procedures in [22] for using the Test Table.
          
          
          
          
          
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          After invoking a loopback test, the object testResult can be
          read to determine the outcome of the loopback test (e.g.,
          'success(2)' if the loopback cell made it back to the
          originator of the test or 'failed(7)' if the loopback cell did
          not make it back).
          
          The following types of loopback tests are defined:
          
               - End-to-end Loopback Test
               - Segment Loopback Test
               - Loopback Test Using Loopback Location Identifier
               - Network Loopback Test.
          
          
          1) End-to-end Loopback Test
          
          The end-to-end loopback (LB) is self-explanatory.  For a VP
          test, the cell is sent on the given VP, via VCI=4 specified in
          [20].  For a VC test, the LB cell is sent on the VC under
          test, with the PTI (Payload Type Indicator) set to 5 as
          specified in [20].  Figure 3 illustrates the end-to-end
          loopback test.
          
            ____      _______      _______      _______      ____
           |Host|    |       |    |       |    |       |    |Host|
           |____|----|SwitchA|----|SwitchB|----|SwitchC|----|____|
                     |_______|    |_______|    |_______|
          
              |<--------------------------------------------->|  Test
                                                                 Path
          
                     Figure 3: End-to-end Loopback Test
          
          
          See Section 5 for more details on how to use the End-to-end
          Loopback Test.
          
          
          2) Segment Loopback Test
          
          The segment LB test is explained in ITU-T I.610[21]. For a VP
          segment test, the LB cell is sent on the VP under test via
          VCI=3 as specified in [20], and the Loopback Location ID field
          is set to all 1's.  For a VC segment test, the LB cell is sent
          on the VC under test, with the PTI set to 4 as specified in
          
          
          
          
          
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          [20], and the Loopback Location ID field is set to all 1's.
          
          This test involves a LB cell being inserted at a pre-defined
          segment end-point, and looped back at the corresponding
          segment end-point encountered.  The pair of segment end-points
          define a segment (which is used for the segment loopback
          test).  A VP/VC connection can have multiple segments, but
          multiple segments cannot overlap.
          
          A UNI interface is by definition defined as a segment end-
          point (hence a UNI would be considered a segment).  A segment
          can also define:
               - a B-ICI
               - a public carrier's 'piece' of the connection
               - a private network's 'piece' of the connection.
          
          
          In order to support this functionality, the VP/VC link
          termination needs to be able to be defined as a segment.  This
          can be done using either the atmVplSegmentEndPoint or
          atmVclSegmentEndPoint object depending on whether it is for a
          VPC or VCC.  A segment loopback test is illustrated in Figure
          4.
          
            ____      _______      _______      _______      ____
           |Host|    |       |    |       |    |       |    |Host|
           |____|----|SwitchA|----|SwitchB|----|SwitchC|----|____|
                     |_______|    |_______|    |_______|
          
                         |<----------------------->|  Segment
          
                       Figure 4: Segment Loopback Test
          
          Section 5 describes the use of the ATM Segment Loopback Tests.
          
          
          3) Loopback Test Using Loopback Location Identifier
          
          This loopback test is a special type of 2) where the Loopback
          Location ID field is set to a value that corresponds to a
          specific node in a given network (Note that the format of this
          field is not standardized, that is, the value is significant
          only within an administrative domain).  In this case, the
          device initiating the LB test inserts the appropriate Loop
          Back Location ID.  When the LB cell reaches the corresponding
          
          
          
          
          
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          device, that device recognizes the Loopback Location ID as its
          own, and loops it back.  This test is useful for performing
          fault sectionalization without having to provision segment
          end-points.  An additional object, the atmLoopbackID, is
          defined to determine the loopback point.  Figure 5 shows a
          loopback test using a location identifier. Note that the
          loopback test using location identifier can be used to perform
          a loopback test over a portion of a defined segment.  See
          Figure 5.
          
            ____      _______      _______      _______      ____
           |Host|    |       |    |       |    |       |    |Host|
           |____|----|SwitchA|----|SwitchB|----|SwitchC|----|____|
                     |_______|    |_______|    |_______|
          
                         |<---------->| Portion of Segment that
                                         Loopback test is
                                         performed on
          
                         |<----------------------->|  Segment
          
              Figure 5: Loopback Test Using Location Identifier
          
          See Section 5 for more details.
          
          
          4) Network Loopback Test
          
          This is a loopback test that the manager requests an agent in
          a network to perform over the internal portion of a designated
          connection.  The Network then initiates the internal network
          loopback test by inserting an OAM loopback cell at one of the
          end-points of the internal network portion of the connection.
          When the loopback cell reaches the other end-point of the
          internal Network , the cell is looped back.  This test is
          useful for verifying connectivity through a particular
          network.  Figure 6 illustrates the Network loopback test.
          
          
          
          
          
          
          
          
          
          
          
          
          
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            ____      _______      _______      _______      ____
           |Host|    |Netwk 1|    |Netwk 1|    |Netwk 1|    |Host|
           |____|----|SwitchA|----|SwitchB|----|SwitchC|----|____|
                     |_______|    |_______|    |_______|
          
                         |<----------------------->| LB Test Path
                                                      thru Network 1
          
                       Figure 6: Network Loopback Test
          
          See Section 5 for more details.
          
          
          4.3.2.  ATM End-Point Tables
          
          There are two ATM End-point tables: the ATM VP End-point Table
          and the ATM VC End-point Table. The ATM VP End-point Table
          augments the atmVplTable and defines the
          atmVplEndptSegmentEndPoint object to represent whether or not
          a specified VPL is a segment end-point. Similarly for Virtual
          Channels, the ATM VC End-point Table and the
          atmVclEndptSegmentEndPoint object are used to represent
          whether or not a specified VCL is a segment end-point.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          5.  Definitions
          
               ATMTEST-MIB DEFINITIONS ::= BEGIN
          
               IMPORTS
                  MODULE-IDENTITY, OBJECT-IDENTITY,
                  OBJECT-TYPE, mib-2
                      FROM SNMPv2-SMI
                  MODULE-COMPLIANCE, OBJECT-GROUP
                      FROM SNMPv2-CONF
                  atmVplEntry, atmVclEntry
                      FROM ATM-MIB;
          
          
               atmTESTMIB MODULE-IDENTITY
                    LAST-UPDATED "9904071200Z"
                    ORGANIZATION "IETF AToMMIB Working Group"
                    CONTACT-INFO
                      "          Michael Noto
                        Postal:  3Com Corporation
                                 5400 Bayfront Plaza
                                 Santa Clara, CA 95052
                                 USA
                        Tel:     +1 408 326 2218
                        E-mail:  mike_noto@3com.com
          
                                 Kaj Tesink
                        Postal:  Telcordia Technologies
                                 331 Newman Springs Road
                                 Red Bank, NJ 07701
                                 USA
                        Tel:     +1 732 758 5254
                        Fax:     +1 732 758 2269
                        E-mail:  kaj@research.telcordia.com"
                    DESCRIPTION
                      "This MIB Module provides
                      ATM Loopback Tests and supporting objects
                      that must be supported by ATM devices
                      providing ATM Loopback Tests."
                    ::= { mib-2 XX }
          
               -- ********  NOTE TO THE RFC EDITOR / IANA ***********
               -- * Before this module is put on the standards track
               -- * assign XX by IANA.
               -- * remove this notice from the MIB
          
          
          
          
          
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               atmTESTMIBObjects  OBJECT IDENTIFIER ::= {atmTESTMIB 1}
          
          
               -- This ATMTEST-MIB Module consists of the following:
               --      (1) ATM Loopback Testing
               --      (2) ATM End-Point Tables
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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               -- ************************************************
               -- (1) ATM Loopback Testing
          
               -- This concerns information for interfaces
               -- supporting ATM Loopback Tests and includes:
               -- 1. ATM Loopback Objects
               -- 2. List of ATM Loopback Test Types
          
               atmLoopbackTestGroup OBJECT IDENTIFIER::= {
                                                  atmTESTMIBObjects 1}
          
          
               -- 1. ATM Loopback Objects
               --    The following objects are defined for use in
               --    performing ATM Loopback Tests.
          
               atmLoopbackID    OBJECT-TYPE
                    SYNTAX         OCTET STRING(SIZE(16))
                    MAX-ACCESS     read-write
                    STATUS         current
                    DESCRIPTION
                      "This identifier is used to identify this local
                      ATM device. The value of this object can be used
                      by other ATM devices to identify this local ATM
                      device as the device that is being requested to
                      loopback the OAM Loopback cell. The default for
                      this field is all 1's, which would indicate a
                      segment OAM Loopback Test. Location Identifiers of
                      less than 16 octets are left justified, and padded
                      with all 0's."
                   DEFVAL  { 'ffffffffffffffffffffffffffffffff'H }
                   ::= { atmLoopbackTestGroup 1 }
          
              -- 2. List of ATM Loopback Test Types
              -- The following loopback test types are defined:
              --      atmLoopbackVpE2e
              --      atmLoopbackVcE2e
              --      atmLoopbackVpSegment
              --      atmLoopbackVcSegment
              --      atmLoopbackVpLocationID
              --      atmLoopbackVcLocationID
              --      atmLoopbackVpServiceInternal
              --      atmLoopbackVcServiceInternal
          
          
          
          
          
          
          
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              atmLoopbackTestTypes OBJECT IDENTIFIER ::= {
                                            atmLoopbackTestGroup 4 }
          
          
              atmLoopbackVpE2e  OBJECT-IDENTITY
                   STATUS       current
                   DESCRIPTION
                     "This is an end-to-end loopback test performed on a
                     designated VP (Virtual Path).  To perform this test
                     an end-to-end loopback OAM cell is inserted at one
                     of the end-points of the designated VP connection
                     (e.g., at a host) via VCI=4 (the VCI value for VP
                     OAM end-to-end cells), travels to the other end-
                     point of the VP connection, and then loops back to
                     the originating end-point on the designated VP.
                     Success is achieved if the loopback OAM cell
                     returns to the originating end-point within 5
                     seconds, otherwise, the test fails.
          
                     The manager-station performs a loopback test by
                     making use of the testTable defined in [22].  In
                     order to run this test the object testType in the
                     testTable shall be set to atmLoopbackVpE2e, and the
                     object testTarget points to the row in the
                     atmVplTable in [16] corresponding to the VP
                     designated for the test.
          
                     Before starting a test, a manager-station must
                     first obtain 'ownership' of the entry in the
                     testTable for the interface to be tested (follow
                     procedure defined in [22]).  Once the manager-
                     station obtains ownership, a loopback test for a
                     given interface can be invoked by first setting up
                     parameters necessary for the loopback test (e.g.,
                     set the testTarget), and then setting the value of
                     testType in the testTable equal to
                     'atmLoopbackVpE2e'. The testRowStatus is used to
                     invoke the atmLoopbackVpE2e test on the VP with the
                     VPI corresponding to the testTarget.
          
                     After invoking a loopback test, wait for the test
                     completion by polling for the object testResult.  A
                     value of 'inProgress(3)' will result if the test is
                     still in progress.  Once the test is completed, the
                     object testResult will have a value of 'success(2)'
          
          
          
          
          
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                     if the loopback OAM cell returned to the originator
                     of the test within 5 seconds, if not, a value of
                     'failed(7)' will result.  If the ATM system does
                     not support this type of loopback test, then a
                     value of 'notSupported(4)' will be provided.  Other
                     possible values for the testResult object are
                     'unAbleToRun(5)' and 'aborted(6)'."
                  ::= { atmLoopbackTestTypes 1 }
          
          
             atmLoopbackVcE2e  OBJECT-IDENTITY
                  STATUS       current
                  DESCRIPTION
                    "This is an end-to-end loopback test performed on a
                    designated VC (Virtual Channel).  To perform this
                    test an end-to-end loopback OAM cell is inserted at
                    one of the end-points of the designated VC
                    connection (e.g., at a host) via PTI=5 (the PTI
                    value used for VC OAM end-to-end cells), travels to
                    the other end-point of the VC connection, and then
                    loops back to the originating end-point on the
                    designated VC.  Success is achieved if the loopback
                    OAM cell returns to the originating end-point within
                    5 seconds, otherwise, the test fails.
          
                    The manager-station performs a loopback test by
                    making use of the testTable defined in [22].  In
                    order to run this test the object testType in the
                    testTable shall be set to atmLoopbackVcE2e, and the
                    object testTarget points to the row in the
                    atmVclTable in [16] corresponding to the VC
                    designated for the test.
          
                    Before starting a test, a manager-station must first
                    obtain 'ownership' of the entry in the testTable for
                    the interface to be tested (follow procedure defined
                    in [22]).  Once the manager-station obtains
                    ownership, a loopback test for a given interface can
                    be invoked by first setting up parameters necessary
                    for the loopback test (e.g., set the testTarget),
                    and then setting the value of testType in the
                    testTable equal to 'atmLoopbackVcE2e'. The
                    testRowStatus is used to invoke the atmLoopbackVcE2e
                    test on the VC with the VPI/VCI corresponding to the
                    testTarget.
          
          
          
          
          
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                    After invoking a loopback test, wait for the test
                    completion by polling for the object testResult.  A
                    value of 'inProgress(3)' will result if the test is
                    still in progress.  Once the test is completed, the
                    object testResult will have a value of 'success(2)'
                    if the loopback OAM cell returned to the originator
                    of the test within 5 seconds, if not, a value of
                    'failed(7)' will result.  If the ATM system does not
                    support this type of loopback test, then a value of
                    'notSupported(4)' will be provided.  Other possible
                    values for the testResult object are
                    'unAbleToRun(5)' and 'aborted(6)'."
                 ::= { atmLoopbackTestTypes 2 }
          
          
            atmLoopbackVpSegment  OBJECT-IDENTITY
                 STATUS           current
                 DESCRIPTION
                   "This is a loopback test performed on a designated
                   segment of a VP (Virtual Path).  To perform this test
                   a segment OAM cell is inserted at one of the segment
                   end-points of the designated VP connection (e.g., at
                   a host) via VCI=3 (the VCI used for VP OAM segment
                   cells), travels across the segment on the designated
                   VP to the device pre-configured as the corresponding
                   segment end-point, and then loops back to the
                   originating segment end-point on the designated VP.
                   Success is achieved if the loopback OAM cell returns
                   to the originating end-point within 5 seconds,
                   otherwise, the test fails.
          
                   In order to use the atmLoopbackVpSegment test, a
                   segment must be defined by setting up segment end-
                   points using the atmVplEndptSegmentEndPoint object
                   from the atmVplEndptTable.  The
                   atmVplEndptSegmentEndPoint is set to
                   'isaVpSegmentEndPoint(1)' for each segment end-point.
                   Note that this object is by default set to
                   'isaVpSegmentEndPoint(1)' if the atmVplTable supports
                   one end of a UNI.  In such a case, a UNI VP loopback
                   test would be achieved when the atmLoopbackVpSegment
                   test was initiated over the UNI.
          
                   The manager-station performs a loopback test by
                   making use of the testTable defined in [22].  In
          
          
          
          
          
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                   order to run this test the object testType in the
                   testTable shall be set to atmLoopbackVpE2e, and the
                   object testTarget points to the row in the
                   atmVplTable in [16] corresponding to the VP
                   designated for the test.
          
                   Before starting a test, a manager-station must first
                   obtain 'ownership' of the entry in the testTable for
                   the interface to be tested (follow procedure defined
                   in [22]).  Once the manager-station obtains
                   ownership, a loopback test for a given interface can
                   be invoked by first setting up parameters necessary
                   for the loopback test (e.g., set the testTarget), and
                   then setting the value of testType in the testTable
                   equal to 'atmLoopbackVpSegment'. The testRowStatus is
                   used to invoke the atmLoopbackVpSegment test on the
                   VP with the VPI corresponding to the testTarget.
          
                   After invoking a loopback test, wait for the test
                   completion by polling for the object testResult.  A
                   value of 'inProgress(3)' will result if the test is
                   still in progress.  Once the test is completed, the
                   object testResult will have a value of 'success(2)'
                   if the loopback OAM cell returned to the originator
                   of the test within 5 seconds, if not, a value of
                   'failed(7)' will result.  If the ATM system does not
                   support this type of loopback test, then a value of
                   'notSupported(4)' will be provided.  Other possible
                   values for the testResult object are 'unAbleToRun(5)'
                   and 'aborted(6)'."
                ::= { atmLoopbackTestTypes 3 }
          
          
           atmLoopbackVcSegment  OBJECT-IDENTITY
                STATUS           current
                DESCRIPTION
                  "This is a loopback test performed on a designated
                  segment of a VC (Virtual Channel).  To perform this
                  test a segment OAM cell is inserted at one of the
                  segment end-points of the designated VC connection
                  (e.g., at a host) via PTI=4 (the PTI value used for VC
                  OAM segment cells), travels across the segment on the
                  designated VC to the device pre-configured as the
                  corresponding segment end-point, and then loops back
                  to the originating segment end-point on the designated
          
          
          
          
          
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                  VC. Success is achieved if the loopback OAM cell
                  returns to the originating end-point within 5 seconds,
                  otherwise, the test fails.
          
                  In order to use the atmLoopbackVcSegment test, a
                  segment must be defined by setting up segment end-
                  points using the atmVclEndptSegmentEndPoint object
                  from the atmVclEndptTable.  The
                  atmVclEndptSegmentEndPoint is set to
                  'isaVcSegmentEndPoint(1)' for each segment end-point.
                  Note that this object is by default set to
                  'isaVcSegmentEndPoint(1)' if the atmVclTable supports
                  one end of a UNI.  In such a case, a UNI VC loopback
                  test would be achieved when the atmLoopbackVcSegment
                  test was initiated over the UNI.
          
                  The manager-station performs a loopback test by making
                  use of the testTable defined in [22].  In order to run
                  this test the object testType in the testTable shall
                  be set to atmLoopbackVcE2e, and the object testTarget
                  points to the row in the atmVclTable in [16]
                  corresponding to the VC designated for the test.
          
                  Before starting a test, a manager-station must first
                  obtain 'ownership' of the entry in the testTable for
                  the interface to be tested (follow procedure defined
                  in [22]).  Once the manager-station obtains ownership,
                  a loopback test for a given interface can be invoked
                  by first setting up parameters necessary for the
                  loopback test (e.g., set the testTarget), and then
                  setting the value of testType in the testTable equal
                  to 'atmLoopbackVcSegment'. The testRowStatus is used
                  to invoke the atmLoopbackVcSegment test on the VC with
                  the VPI/VCI corresponding to the testTarget.
          
                  After invoking a loopback test, wait for the test
                  completion by polling for the object testResult.  A
                  value of 'inProgress(3)' will result if the test is
                  still in progress.  Once the test is completed, the
                  object testResult will have a value of 'success(2)' if
                  the loopback OAM cell returned to the originator of
                  the test within 5 seconds, if not, a value of
                  'failed(7)' will result.  If the ATM system does not
                  support this type of loopback test, then a value of
                  'notSupported(4)' will be provided.  Other possible
          
          
          
          
          
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                  values for the testResult object are 'unAbleToRun(5)'
                  and 'aborted(6)'."
               ::= { atmLoopbackTestTypes 4 }
          
          
          atmLoopbackVpLocationId  OBJECT-IDENTITY
               STATUS              current
               DESCRIPTION
                 "This is a loopback test performed on a portion of a
                 designated VP segment.  To perform this test a loopback
                 OAM cell is inserted at a connection point of the
                 designated VP connection (e.g., the end-point or a
                 tandem point) with a value inserted in the Location
                 Identifier ID field of the OAM cell that corresponds to
                 the ATM device where the cell is to be looped back.
                 The loopback cell then travels through the VP
                 connection until it reaches the designated ATM device,
                 where it is looped back to the loopback cell insertion
                 point on the designated VP.  Success is achieved if the
                 loopback OAM cell returns to the originating point of
                 insertion within 5 seconds, otherwise, the test fails.
          
                 The manager-station performs a loopback test by making
                 use of the testTable defined in [22].  In order to run
                 this test the object testType in the testTable shall be
                 set to atmLoopbackVpE2e. The object testTarget points
                 to the row in the atmVplTable in [16] corresponding to
                 the VP designated for the test. The object testMoreInfo
                 contains the desired Loopback Location ID.
          
                 Before starting a test, a manager-station must first
                 obtain 'ownership' of the entry in the testTable for
                 the interface to be tested (follow procedure defined in
                 [22]). Once the manager-station obtains ownership, a
                 loopback test for a given interface can be invoked by
                 first setting up parameters necessary for the loopback
                 test (e.g., set testMoreInfo to AAAABBBBCCCCDDDD and
                 set the testTarget), and then setting the value of
                 testType in the testTable equal to
                 'atmLoopbackVpSegment'. The testRowStatus is used to
                 invoke the atmLoopbackVpLocationId on the VP with the
                 VPI corresponding to the testTarget and looped back at
                 loopback location ID= AAAABBBBCCCCDDDD.
          
                 After invoking a loopback test, wait for the test
          
          
          
          
          
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                 completion by polling for the object testResult.  A
                 value of 'inProgress(3)' will result if the test is
                 still in progress.  Once the test is completed, the
                 object testResult will have a value of 'success(2)' if
                 the loopback OAM cell returned to the originator of the
                 test within 5 seconds, if not, a value of 'failed(7)'
                 will result.  If the ATM system does not support this
                 type of loopback test, then a value of
                 'notSupported(4)' will be provided.  Other possible
                 values for the testResult object are 'unAbleToRun(5)'
                 and 'aborted(6)'."
               ::= { atmLoopbackTestTypes 5 }
          
          
          atmLoopbackVcLocationId  OBJECT-IDENTITY
               STATUS              current
               DESCRIPTION
                 "This is a loopback test performed on a portion of a
                 designated Vc segment.  To perform this test a loopback
                 OAM cell is inserted at a connection point of the
                 designated VC connection (e.g., the end-point or a
                 tandem point) with a value inserted in the Location
                 Identifier ID field of the OAM cell that corresponds to
                 the ATM device where the cell is to be looped back.
                 The loopback cell then travels through the VC
                 connection until it reaches the designated ATM device,
                 where it is looped back to the loopback cell insertion
                 point on the designated VC.  Success is achieved if the
                 loopback OAM cell returns to the originating point of
                 insertion within 5 seconds, otherwise, the test fails.
          
                 The manager-station performs a loopback test by making
                 use of the testTable defined in [22].  In order to run
                 this test the object testType in the testTable shall be
                 set to atmLoopbackVcE2e. The object testTarget points
                 to the row in the atmVclTable in [16] corresponding to
                 the VC designated for the test. The object testMoreInfo
                 contains the desired Loopback Location ID.
          
                 Before starting a test, a manager-station must first
                 obtain 'ownership' of the entry in the testTable for
                 the interface to be tested (follow procedure defined in
                 [22]). Once the manager-station obtains ownership, a
                 loopback test for a given interface can be invoked by
                 first setting up parameters necessary for the loopback
          
          
          
          
          
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                 test (e.g., set testMoreInfo to AAAABBBBCCCCDDDD and
                 set the testTarget), and then setting the value of
                 testType in the testTable equal to
                 'atmLoopbackVcSegment.d'. The testRowStatus is used to
                 invoke the atmLoopbackVcLocationId test on the VC with
                 the VPI/VCI corresponding to the testTarget and looped
                 back at loopback location ID= AAAABBBBCCCCDDDD.
          
                 After invoking a loopback test, wait for the test
                 completion by polling for the object testResult.  A
                 value of 'inProgress(3)' will result if the test is
                 still in progress.  Once the test is completed, the
                 object testResult will have a value of 'success(2)' if
                 the loopback OAM cell returned to the originator of the
                 test within 5 seconds, if not, a value of 'failed(7)'
                 will result.  If the ATM system does not support this
                 type of loopback test, then a value of
                 'notSupported(4)' will be provided.  Other possible
                 values for the testResult object are 'unAbleToRun(5)'
                 and 'aborted(6)'."
               ::= { atmLoopbackTestTypes 6 }
          
          atmLoopbackVpServiceInternal  OBJECT-IDENTITY
               STATUS              current
               DESCRIPTION
                 "This is a loopback test that the manager requests an
                 agent to perform over the managed resource's internal
                 portion of a designated VP (i.e., between the ingress
                 and egress interfaces of the VP connection).  The agent
                 is provided with the Ingress VPI, Egress Interface, and
                 Egress VPI in order to run this internal test.  This
                 test may be useful in proxy situations where the proxy
                 agent represents a network.  Implementations of this
                 test may be specific to the managed resource.  One
                 implementation in a managed network may be as follows,
                 the managed network inserts a segment loopback OAM cell
                 at the network internal segment end-point
                 (corresponding to the ingress connection point) for the
                 designated VP connection.  The loopback cell then
                 travels through the network's portion of the VP
                 connection until it reaches the networks connection
                 point to the egress, where it is looped back to the
                 network's cell insertion point on the designated VP.
                 Success is achieved if the loopback OAM cell returns to
                 the originating internal network segment end-point
          
          
          
          
          
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                 within 5 seconds, otherwise, the test fails.
          
                 The manager-station performs a loopback test by making
                 use of the testTable defined in [22].  In order to run
                 this test the object testType in the testTable shall be
                 set to atmLoopbackVpServiceInternal, and the object
                 testTarget points to the row in the
                 atmVpCrossConnectTable in [16] corresponding to the VP
                 designated for the test.
          
                 Before starting a test, a manager-station must first
                 obtain 'ownership' of the entry in the testTable for
                 the interface to be tested (follow procedure defined in
                 [22]).  Once the manager-station obtains ownership, a
                 loopback test for a given interface can be invoked by
                 first setting up parameters necessary for the loopback
                 test (e.g., set the testTarget), and then setting the
                 value of testType in the testTable equal to
                 'atmLoopbackVpServiceInternal' The testRowStatus is
                 used to invoke the atmLoopbackVpServiceInternal test on
                 the VP crossconnect with the ingress and egress VPI
                 values corresponding to the testTarget.
          
                 After invoking a loopback test, wait for the test
                 completion by polling for the object testResult.  A
                 value of 'inProgress(3)' will result if the test is
                 still in progress.  Once the test is completed, the
                 object testResult will have a value of 'success(2)' if
                 the loopback OAM cell returned to the originator of the
                 test within 5 seconds, if not, a value of 'failed(7)'
                 will result.  If the ATM system does not support this
                 type of loopback test, then a value of
                 'notSupported(4)' will be provided.  Other possible
                 values for the testResult object are 'unAbleToRun(5)'
                 and 'aborted(6)'."
               ::= { atmLoopbackTestTypes 7 }
          
          atmLoopbackVcServiceInternal  OBJECT-IDENTITY
               STATUS              current
               DESCRIPTION
                 "This is a loopback test that the manager requests an
                 agent to perform over the managed resource's internal
                 portion of a designated VC (i.e., between the ingress
                 and egress interfaces of the VC connection).  The agent
                 is provided with the Ingress VPI, Ingress VCI, Egress
          
          
          
          
          
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                 Interface, Egress VPI, and Egress VCI in order to run
                 this internal test.  This test may be useful in proxy
                 situations where the proxy agent represents a network.
                 Implementations of this test may be specific to the
                 managed resource.  One implemenation in a managed
                 network may be as follows, the managed network inserts
                 a segment loopback OAM cell at the network internal
                 segment end-point (corresponding to the ingress
                 connection point) for the designated VC connection.
                 The loopback cell then travels through the network's
                 portion of the VC connection until it reaches the
                 network's connection point to the egress, where it is
                 looped back to the network's cell insertion point on
                 the designated VC.  Success is achieved if the loopback
                 OAM cell returns to the originating internal network
                 segment end-point within 5 seconds, otherwise, the test
                 fails.
          
                 The manager-station performs a loopback test by making
                 use of the testTable defined in [22].  In order to run
                 this test the object testType in the testTable shall be
                 set to atmLoopbackVcServiceInternal, and the object
                 testTarget points to the row in the
                 atmVcCrossConnectTable in [16] corresponding to the VC
                 designated for the test.
          
                 Before starting a test, a manager-station must first
                 obtain 'ownership' of the entry in the testTable for
                 the interface to be tested (follow procedure defined in
                 [22]).  Once the manager-station obtains ownership, a
                 loopback test for a given interface can be invoked by
                 first setting up parameters necessary for the loopback
                 test (e.g., set the testTarget), and then setting the
                 value of testType in the testTable equal to
                 'atmLoopbackVcServiceInternal'. The testRowStatus is
                 used to invoke the atmLoopbackVcServiceInternal test on
                 the VC crossconnect with the ingress and egress VPI/VCI
                 values corresponding to the testTarget.
          
                 After invoking a loopback test, wait for the test
                 completion by polling for the object testResult.  A
                 value of 'inProgress(3)' will result if the test is
                 still in progress.  Once the test is completed, the
                 object testResult will have a value of 'success(2)' if
                 the loopback OAM cell returned to the originator of the
          
          
          
          
          
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                 test within 5 seconds, if not, a value of 'failed(7)'
                 will result.  If the ATM system does not support this
                 type of loopback test, then a value of
                 'notSupported(4)' will be provided.  Other possible
                 values for the testResult object are 'unAbleToRun(5)'
                 and 'aborted(6)'."
               ::= { atmLoopbackTestTypes 8 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- ************************************************
          -- (2) ATM End-Point Tables
          
          -- This concerns information for interfaces
          -- supporting ATM Loopback Tests and includes:
          -- 1. ATM VP End-Point Table
          -- 2. ATM VC End-Point Table
          
          atmEndptGroup OBJECT IDENTIFIER::= {
                                             atmTESTMIBObjects 2}
          
          
          -- 1. ATM VP End-Point Table
          
          
              atmVplEndptTable OBJECT-TYPE
                  SYNTAX           SEQUENCE OF AtmVplEndptEntry
                  MAX-ACCESS       not-accessible
                  STATUS           current
                  DESCRIPTION
                      "End-point Information for each VP."
                  ::= { atmEndptGroup 1 }
          
          
              atmVplEndptEntry OBJECT-TYPE
                  SYNTAX  AtmVplEndptEntry
                  MAX-ACCESS  not-accessible
                  STATUS  current
                  DESCRIPTION
                      "An entry with end-point information about the ATM
                      VP."
                  AUGMENTS { atmVplEntry }
                  ::= { atmVplEndptTable 1 }
          
          
              AtmVplEndptEntry ::=
                  SEQUENCE {
                      atmVplEndptSegmentEndPoint     INTEGER
                           }
          
              atmVplEndptSegmentEndPoint OBJECT-TYPE
                  SYNTAX  INTEGER {
                                   isaVplSegmentEndPoint(1),
                                   notaVplSegmentEndPoint(2)
                                  }
          
          
          
          
          
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                  MAX-ACCESS  read-create
                  STATUS  current
                  DESCRIPTION
                      "An indication of whether or not the VP interface
                      has been configured to represent a VPC Segment
                      End-Point. If the corresponding VP Link is a UNI,
                      the value of this object is permanently set to
                      isaVplSegmentEndPoint(1). Otherwise, the default
                      is set to notaVplSegmentEndPoint(2)."
                  ::= { atmVplEndptEntry 1 }
          
          -- 2. ATM VC End-Point Table
          
          
              atmVclEndptTable OBJECT-TYPE
                  SYNTAX           SEQUENCE OF AtmVclEndptEntry
                  MAX-ACCESS       not-accessible
                  STATUS           current
                  DESCRIPTION
                      "End-point Information for each VC."
                  ::= { atmEndptGroup 2 }
          
          
              atmVclEndptEntry OBJECT-TYPE
                  SYNTAX  AtmVclEndptEntry
                  MAX-ACCESS  not-accessible
                  STATUS  current
                  DESCRIPTION
                      "An entry with end-point information about the ATM
                      VC."
                  AUGMENTS { atmVclEntry }
                  ::= { atmVclEndptTable 1 }
          
          
              AtmVclEndptEntry ::=
                  SEQUENCE {
                    atmVclEndptSegmentEndPoint  INTEGER
                           }
          
              atmVclEndptSegmentEndPoint OBJECT-TYPE
                  SYNTAX  INTEGER {
                                   isaVclSegmentEndPoint(1),
                                   notaVclSegmentEndPoint(2)
                                  }
                  MAX-ACCESS  read-create
          
          
          
          
          
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                  STATUS  current
                  DESCRIPTION
                      "An indication of whether or not the VC interface
                      has been configured to represent a VCC Segment
                      End-Point. If the corresponding VC Link is a UNI,
                      the value of this object is permanently set to
                      isaVclSegmentEndPoint(1). Otherwise, the default
                      is set to notaVclSegmentEndPoint(2)."
                  ::= { atmVclEndptEntry 1 }
          
          -- ************************************************
          
          -- Conformance Information
          
          atmTESTMIBConformance   OBJECT IDENTIFIER ::= {atmTESTMIB 2}
          
          atmTESTMIBGroups        OBJECT IDENTIFIER
                           ::= {atmTESTMIBConformance 1}
          
          atmTESTMIBCompliances   OBJECT IDENTIFIER
                           ::= {atmTESTMIBConformance 2}
          
          -- Compliance Statements
          
          atmTESTMIBCompliance   MODULE-COMPLIANCE
               STATUS         current
               DESCRIPTION
                 "The compliance statement for SNMP entities which
                 represent ATM interfaces.  The compliance statements
                 are used to determine if a particular group or object
                 applies to hosts, networks/switches, or both."
          
               MODULE  -- this module
          
                 MANDATORY-GROUPS  { atmLoopbackGroup }
          
          -- Objects in the ATM Loopback Test Group
          
          OBJECT      atmLoopbackID
          MIN-ACCESS  read-only
          DESCRIPTION
                   "Write access is not required. This object is
                 required for ATM systems supporting the
                 atmLoopbackVpLocationID and atmLoopbackVcLocationID
                 tests."
          
          
          
          
          
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          OBJECT      atmVplEndptSegmentEndPoint
          MIN-ACCESS  read-only
          DESCRIPTION
                   "Write access is not required.  This object is
                 mandatory for systems that are supporting ATM loopback
                 tests."
          
          OBJECT      atmVclEndptSegmentEndPoint
          MIN-ACCESS  read-only
          DESCRIPTION
                   "Write access is not required.  This object is
                 mandatory for systems that are supporting ATM loopback
                 tests."
          
          
                      ::= { atmTESTMIBCompliances 1 }
          
          -- **********************************************
          
          -- Units of Conformance
          
          
          atmLoopbackGroup     OBJECT-GROUP
          
                 OBJECTS {
                      atmLoopbackID,
                      atmVplEndptSegmentEndPoint,
                      atmVclEndptSegmentEndPoint
                 }
                 STATUS    current
                 DESCRIPTION
                          "A collection of objects providing information
                        for Loopback Tests."
                ::= { atmTESTMIBGroups 1 }
          
          
          END
          
          
          
          
          
          
          
          
          
          
          
          
          
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          6.  Acknowledgments
          
          This document is a product of the AToMMIB Working Group. The
          authors would like to acknowledge Dawn Xie for her valuable
          suggestions for this memo.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          7.  References
          
          [1]  Harrington, D., Presuhn, R., and B. Wijnen, "An
               Architecture for Describing SNMP Management Frameworks",
               RFC 2271, Cabletron Systems, Inc., BMC Software, Inc.,
               IBM T. J. Watson Research, January 1998
          
          [2]  Rose, M., and K. McCloghrie, "Structure and
               Identification of Management Information for TCP/IP-based
               Internets", RFC 1155, Performance Systems International,
               Hughes LAN Systems, May 1990
          
          [3]  Rose, M., and K. McCloghrie, "Concise MIB Definitions",
               RFC 1212, Performance Systems International, Hughes LAN
               Systems, March 1991
          
          [4]  M. Rose, "A Convention for Defining Traps for use with
               the SNMP", RFC 1215, Performance Systems International,
               March 1991
          
          [5]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Structure of Management Information
               for Version 2 of the Simple Network Management Protocol
               (SNMPv2)", RFC 1902, SNMP Research,Inc., Cisco Systems,
               Inc., Dover Beach Consulting, Inc., International Network
               Services, January 1996.
          
          [6]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Textual Conventions for Version 2 of
               the Simple Network Management Protocol (SNMPv2)", RFC
               1903, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [7]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Conformance Statements for Version 2
               of the Simple Network Management Protocol (SNMPv2)", RFC
               1904, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [8]  Case, J., Fedor, M., Schoffstall, M., and J. Davin,
               "Simple Network Management Protocol", RFC 1157, SNMP
               Research, Performance Systems International, Performance
               Systems International, MIT Laboratory for Computer
          
          
          
          
          
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               Science, May 1990.
          
          [9]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Introduction to Community-based
               SNMPv2", RFC 1901, SNMP Research, Inc., Cisco Systems,
               Inc., Dover Beach Consulting, Inc., International Network
               Services, January 1996.
          
          [10] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Transport Mappings for Version 2 of
               the Simple Network Management Protocol (SNMPv2)", RFC
               1906, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [11] Case, J., Harrington D., Presuhn R., and B. Wijnen,
               "Message Processing and Dispatching for the Simple
               Network Management Protocol (SNMP)", RFC 2272, SNMP
               Research, Inc., Cabletron Systems, Inc., BMC Software,
               Inc., IBM T. J. Watson Research, January 1998.
          
          [12] Blumenthal, U., and B. Wijnen, "User-based Security Model
               (USM) for version 3 of the Simple Network Management
               Protocol (SNMPv3)", RFC 2274, IBM T. J. Watson Research,
               January 1998.
          
          [13] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Protocol Operations for Version 2 of
               the Simple Network Management Protocol (SNMPv2)", RFC
               1905, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [14] Levi, D., Meyer, P., and B. Stewart, SNMPv3
               Applications", RFC 2273, SNMP Research, Inc., Secure
               Computing Corporation, Cisco Systems, January 1998.
          
          [15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based
               Access Control Model (VACM) for the Simple Network
               Management Protocol (SNMP)", RFC 2275, IBM T. J. Watson
               Research, BMC Software, Inc., Cisco Systems, Inc.,
               January 1998.
          
          
          
          
          
          
          
          
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          [16] Kaj Tesink, "Definitions of Managed Objects for ATM
               Management", RFC 2515, Bellcore, February 1999.
          
          [17] McCloghrie, K., and M. Rose, Editors, "Management
               Information Base for Network Management of TCP/IP-based
               internets: MIB-II", STD 17, RFC 1213, Hughes LAN Systems,
               Performance Systems International, March 1991.
          
          [18] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
               MIB", RFC2233, cisco Systems, FTP Software, November
               1997.
          
          [19] ATM Forum, "ATM User-Network Interface, Version 3.0 (UNI
               3.0) Specification, Part I", 1994.
          
          [20] ATM Forum, "ATM User-Network Interface, Version 3.1 (UNI
               3.1) Specification, Part I", November 1994.
          
          [21] ITU-T Recommendation I.610, "Broadband Integrated Service
               Digital Network (B-ISDN) Operation and Maintenance
               Principles and Functions", July 1995.
          
          [22] McCloghrie, K., M. Greene, and K. Tesink, "Definitions of
               Managed Objects for System and Interface Testing",
               RFCxxxx, cisco Systems, Xedia Corp, Telcordia, ???? 1999.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          8.  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.
          
          The managed objects in this MIB contain sensitive information
          since, collectively, they allow the invocation of tests on the
          managed device.
          
          This MIB contains objects which allow an administrator to
          perform tests on ATM interfaces.  Tests can only be performed
          when using these objects in conjunction with [22].
          Unauthorized access to the associated objects could cause a
          denial of service, or in combination with other (e.g.,
          physical) security breaches, could cause unauthorized
          connectivity to a device. The tests defined in this document
          are not service interrupting.
          
          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 RFC 2274 [12] and the
          View-based Access Control Model RFC 2275 [15] 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.
          
          
          
          
          
          
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          9.  Authors' Addresses
          
                            Michael Noto
                            3Com Corporation
                            5400 Bayfront Plaza
                            Santa Clara, CA 95052
                            Phone: (408) 326-2218
                            E-mail: mike_noto@3com.com
          
                            Kaj Tesink
                            Telcordia Technologies
                            331 Newman Springs Road
                            P.O. Box 7020
                            Red Bank, NJ  07701-7020
                            Phone: (732) 758-5254
                            EMail: kaj@research.telcordia.com
          
          
          10.  RFC Editor and IANA Considerations
          
          Prior to publication of this memo as an RFC, the RFC Editor
          and IANA are requested to make a suitable OBJECT IDENTIFIER
          assignment for this MIB module (the value for XX below) and
          update the following in the MIB:
          
               ::= { mib-2 XX }
          
          -- ********  NOTE TO THE RFC EDITOR / IANA ***********
          -- * Before this module is put on the standards track
          -- * assign XX by IANA.
          -- * remove this notice from the MIB
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          11.  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.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          12.  Full Copyright Statement
          
          Copyright (C) The Internet Society (1999).  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.
          
          
          
          Table of Contents
          
          
          1 Status of this Memo ...................................    1
          2 Abstract ..............................................    2
          3 The SNMP Network Management Framework .................    2
          4 Overview ..............................................    4
          4.1 Background ..........................................    4
          4.2 Terminology .........................................    5
          4.3 Supported Functions .................................    6
          4.3.1 ATM Loopback Testing ..............................    6
          
          
          
          
          
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          4.3.2 ATM End-Point Tables ..............................   10
          5 Definitions ...........................................   11
          6 Acknowledgments .......................................   29
          7 References ............................................   30
          8 Security Considerations ...............................   33
          9 Authors' Addresses ....................................   34
          10 RFC Editor and IANA Considerations ...................   34
          11 Intellectual Property ................................   35
          12 Full Copyright Statement .............................   36
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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