rfc1694.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

Network Working Group                                           T. Brown
Request for Comments: 1694                                     K. Tesink
Obsoletes: 1304                                                  Editors
Category: Standards Track                   Bell Communications Research
                                                             August 1994


                     Definitions of Managed Objects
                    for SMDS Interfaces using SMIv2

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.

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 objects for SMDS
   access interfaces. This includes the following access protocols:

             SIP [13]
             SIP/DXI [18] and [20]
             SIP/FR [19]
             SIP/ATM [24]

   This memo replaces RFC 1304 [12], and defines a MIB module which is
   both compliant to the SNMPv2 SMI and semantically-identical to the
   existing RFC 1304-based definitions.

   This memo also assumes application of the MIB II Interfaces group as
   defined in [9].

Table of Contents

   1. The SNMPv2 Network Management Framework ...............    2
   2. Objects ...............................................    3
   2.1 Format of Definitions ................................    3
   3. Overview ..............................................    4
   3.1 SIP Level 3 ..........................................    5
   4. Object Definitions ....................................    9
   4.1 The SIP Level 3 Group ................................   10
   4.2 The SIP Level 2 Group ................................   14
   4.3 The SIP PLCP Group ...................................   17



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RFC 1694                 SMDS Interface Objects              August 1994


   4.3.1 The DS1 PLCP Group .................................   17
   4.3.2 The DS3 PLCP Group .................................   19
   4.4 The SMDS Applications Group ..........................   20
   4.4.1 The IP over SMDS Group .............................   21
   4.5 The SMDS Carrier Selection Group .....................   22
   4.6 The SIP Error Log Group ..............................   23
   4.7 The Data eXchange Interface Group ....................   27
   4.8 Conformance Information ..............................   29
   5. Acknowledgments .......................................   32
   6. References ............................................   32
   7. Security Considerations ...............................   34
   8. Authors' Addresses ....................................   35

1.  The SNMPv2 Network Management Framework

   The SNMPv2 Network Management Framework consists of four major
   components.  They are:

      o RFC 1442 [1] which defines the SMI, the mechanisms used for
        describing and naming objects for the purpose of
        management.

      o STD 17, RFC 1213 [6] defines MIB-II, the core set of managed
        objects for the Internet suite of protocols.  Reference [12]
        defines the evolution of the Interfaces Group of MIB II in
        terms of extensions and precise applications of the objects.

      o RFC 1445 [4] which defines the administrative and other
        architectural aspects of the framework.

      o RFC 1448 [5] which defines the protocol used for network
        access to managed objects.

   The Framework permits new objects to be defined for the purpose of
   experimentation and evaluation.

   This specification makes also use of:

      o RFC 1443 [2] which defines textual conventions for the
        specification of managed objects.

      o RFC 1444 [3] which defines conformance statements for the
        specification of managed objects.








Brown & Tesink                                                  [Page 2]

RFC 1694                 SMDS Interface Objects              August 1994


2.  Objects

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the subset of Abstract Syntax Notation One (ASN.1) [7]
   defined in the SMI.  In particular, each object has a name, a syntax,
   and an encoding.  The name is an object identifier, an
   administratively assigned name, which specifies an object type.  The
   object type together with an object instance serves to uniquely
   identify a specific instantiation of the object.  For human
   convenience, we often use a textual string, termed the OBJECT
   DESCRIPTOR, to also refer to the object type.

   The syntax of an object type defines the abstract data structure
   corresponding to that object type.  The ASN.1 language is used for
   this purpose.  However, the SMI RFC 1442 purposely restricts the
   ASN.1 constructs which may be used.  These restrictions are
   explicitly made for simplicity.

   The encoding of an object type is simply how that object type is
   represented using the object type's syntax.  Implicitly tied to the
   notion of an object type's syntax and encoding is how the object type
   is represented when being transmitted on the network.  The SMI
   specifies the use of the basic encoding rules of ASN.1 [8], subject
   to the additional requirements imposed by the SNMP.

2.1.  Format of Definitions

   Section 4 contains contains the specification of all object types
   contained in this MIB module.  The object types are defined using the
   conventions defined in the SMI, as amended by the extensions
   specified in the SNMPv2 SMI.



















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RFC 1694                 SMDS Interface Objects              August 1994


3.  Overview

   SMDS is a service that can be provided by numerous interface
   protocols as shown in the following figure:

             +-------------------+   +-------------------+
             | SIP Level 3* [13] |   | SIP Level 3* [13] |
             +-------------------+   +-------------------+
             | SIP Level 2* [13] |   | DXI Level 2* [20] |
             +-------------------+   +-------------------+
             | SIP PLCP* [14]    |   |                   |
             +-------------------+   | DXI Level 1 [20]  |
             | SIP Level 1 [14]  |   |                   |
             +-------------------+   +-------------------+
                SIP based access        DXI based access

             +-------------------+   +-------------------+
             | SIP Level 3* [13] |   | SIP Level 3* [13] |
             +-------------------+   +-------------------+
             | ATM  [21]         |   | Frame Relay [19]  |
             +-------------------+   +-------------------+
             | ATM PLCP [21]     |   |                   |
             +-------------------+   | Frame Relay [19]  |
             | ATM Level 1 [21]  |   |   Level 1         |
             +-------------------+   +-------------------+
                ATM based access        FR based access

























Brown & Tesink                                                  [Page 4]

RFC 1694                 SMDS Interface Objects              August 1994


   In the figure below, managed objects for the protocol levels marked
   with a (*) are defined in this memo.  Additional managed objects that
   must be used to manage SMDS interfaces are defined in other MIB
   modules as indicated in the figure.

             +-------------------+   +-------------------+
             | SIP Level 3*      |   | SIP Level 3*      |
             +-------------------+   +-------------------+
             | SIP Level 2*      |   | DXI Level 2*      |
             +-------------------+   +-------------------+
             | SIP PLCP*         |   |                   |
             +-------------------+   | DXI Level 1       |
             | SIP Level 1       |   |                   |
             |    [10] or [11]   |   |    [10]           |
             +-------------------+   +-------------------+
                SIP based access        DXI based access

             +-------------------+   +-------------------+
             | SIP Level 3*      |   | SIP Level 3*      |
             +-------------------+   +-------------------+
             | ATM  [22]         |   | Frame Relay [23]  |
             +-------------------+   +-------------------+
             | ATM PLCP/TC [22]  |   |                   |
             +-------------------+   | Frame Relay       |
             | ATM Level 1 [10]  |   |   Level 1         |
             | [11], or [25]     |   |   [10] or [11]    |
             +-------------------+   +-------------------+
                ATM based access        FR based access

   With the improved interpretation of the MIB II interfaces group [9],
   some objects can be represented by ifTable. This means that these
   objects have been deprecated from the MIB module defined in RFC 1304,
   and ifTable is used instead. No semantical changes have been made to
   these objects. Only the object identifiers and object descriptors
   have been changed to the objects defined in ifTable.

   Implementation experience has shown that the objects
   sipL3UnrecognizedIndividualDAs and sipL3UnrecognizedGAs were not
   supported.

3.1.  SIP Level 3

   Objects for SIP Level 3 apply to all methods to access SMDS shown in
   the figures above. With the improved interpretation of the MIB II
   interfaces group, most objects can be represented by ifTable. The
   appropriate mapping is defined below.





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RFC 1694                 SMDS Interface Objects              August 1994


   This document does not specify objects for the management of
   subscription or configuration of Subscriber-Network Interfaces
   (SNIs). Those objects are defined in Definitions of Managed Objects
   for SMDS Subscription [17]. Bellcore requirements on these objects
   are specified in TR-TSV-001062 [16].

          ifTable Object     Use for
          ======================================================
           ifIndex           Interface index.

           ifDescr           Interface description.
                             For example, SIP Level 3 sublayer
                             of a SNI.

           ifType            Set to 31.

           ifMtu             Set to 9232.

           ifSpeed           Peak bandwidth in bits per second available
                             for use as provided by the supporting Level
                             2 protocol. For example, 1.17 Mbps when
                             using SIP based DS1 SNIs, and 1.536 Mbps
                             when using DXI-based DS1 DXI-SNI.

           ifPhysAddress     OCTET STRING of Size 8. Value is
                             a 16-digit Binary Coded Decimal
                             SMDS address that is
                             assigned to this interface.

           ifAdminStatus     The desired administrative status of the
                             SMDS interface.

           ifOperStatus      The current operational status of the
                             SMDS interface.

           ifLastChange      The elapsed time since the last
                             re-initialization of the interface.
                             The value of sysUpTime at the time the
                             interface entered its current
                             operational state. If the current
                             state was entered prior to the last
                             re-initialization of the local
                             network management subsystem, then
                             this object contains a zero value.

           ifInOctets        Number of received octets at SIP Level 3.
                             For SIP based SNIs, this is the number of
                             sipL2ReceivedCounts multiplied by 44.



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RFC 1694                 SMDS Interface Objects              August 1994


           ifInUcastPkts     The total number of individually addressed
                             SIP Level 3 PDUs received from the remote
                             system across the SNI.  The total includes
                             only unerrored SIP Level 3 PDUs.
                             [identical to RFC1304:
                             sipL3ReceivedIndividualDAs]