rfc1315.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                                           C. Brown
Request for Comments: 1315                Wellfleet Communications, Inc.
                                                                F. Baker
                                        Advanced Computer Communications
                                                             C. Carvalho
                                        Advanced Computer Communications
                                                              April 1992


            Management Information Base for Frame Relay DTEs

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community, and requests discussion and suggestions for improvements.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" 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 Frame Relay.

Table of Contents

   1. The Network Management Framework ............................    2
   2. Objects .....................................................    2
   2.1 Format of Definitions ......................................    3
   3. Overview ....................................................    3
   3.1 Frame Relay Operational Model ..............................    3
   3.2 Textual Conventions ........................................    3
   3.3 Structure of MIB ...........................................    3
   4. Definitions .................................................    4
   4.1 Data Link Connection Management Interface ..................    4
   4.2 Circuit Table ..............................................    9
   4.3 Error Table ................................................   14
   5. Acknowledgements ............................................   17
   6. References ..................................................   17
   7. Security Considerations......................................   18
   8. Authors' Addresses...........................................   19









Brown, Baker & Carvalho                                         [Page 1]

RFC 1315                  Frame Relay DTE MIB                 April 1992


1.  The Network Management Framework

   The Internet-standard Network Management Framework consists of three
   components.  They are:

   RFC 1155 which defines the SMI, the mechanisms used for describing
   and naming objects for the purpose of management.  RFC 1212 defines a
   more concise description mechanism, which is wholly consistent with
   the SMI.

   RFC 1156 which defines MIB-I, the core set of managed objects for the
   Internet suite of protocols.  RFC 1213 defines MIB-II, an evolution
   of MIB-I based on implementation experience and new operational
   requirements.

   RFC 1157 which defines the SNMP, the protocol used for network access
   to managed objects.

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

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 [3] 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.




Brown, Baker & Carvalho                                         [Page 2]

RFC 1315                  Frame Relay DTE MIB                 April 1992


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 [9,10].

3.  Overview

3.1.  Frame Relay Operational Model

   For the purposes of understanding this document, Frame Relay is
   viewed as a multi-access media, not as a group of point-to-point
   connections.  This model proposes that Frame Relay is a single
   interface to the network (physical connection) with many destinations
   or neighbors (virtual connections).  This view enables a network
   manager the ability to group all virtual connections with their
   corresponding physical connection thereby allowing simpler
   diagnostics and trouble shooting.

3.2.  Textual Conventions

   Several new data types are introduced as a textual convention in this
   MIB document.  These textual conventions enhance the readability of
   the specification and can ease comparison with other specifications
   if appropriate.  It should be noted that the introduction of the
   these textual conventions has no effect on either the syntax nor the
   semantics of any managed objects.  The use of these is merely an
   artifact of the explanatory method used.  Objects defined in terms of
   one of these methods are always encoded by means of the rules that
   define the primitive type.  Hence, no changes to the SMI or the SNMP
   are necessary to accommodate these textual conventions which are
   adopted merely for the convenience of readers and writers in pursuit
   of the elusive goal of clear, concise, and unambiguous MIB documents.

   The new data types are Index and DLCI.  Index refers to the range
   1..ifNumber, and is used to establish the correspondence between
   ifEntries and Frame Relay Interfaces.  DLCI refers to the range
   0..DLCINumber, and is used to refer to the valid Data Link Connection
   Indices.  DLCINumber is, by definition, the largest possible DLCI
   value possible under the configured Q.922 Address Format.

3.3.  Structure of MIB

   The MIB is composed of three groups, one defining the Data Link
   Connection Management Interface (DLCMI), one describing the Circuits,
   and a third describing errors.




Brown, Baker & Carvalho                                         [Page 3]

RFC 1315                  Frame Relay DTE MIB                 April 1992


   During normal operation, Frame Relay virtual circuits will be added,
   deleted and change availability.  The occurrence of such changes is
   of interest to the network manager and therefore, one trap is
   defined, intended to be corollary to the SNMP "Link Up" and "Link
   Down" traps.

4.  Definitions

     RFC1315-MIB DEFINITIONS ::= BEGIN

     IMPORTS
             OBJECT-TYPE
                     FROM RFC-1212
             transmission
                     FROM RFC1213-MIB
             TimeTicks
                     FROM RFC-1155
             TRAP-TYPE
                     FROM RFC-1215;

     --  Frame Relay DTE MIB

     frame-relay     OBJECT IDENTIFIER ::= { transmission 32 }

     --
     --      the range of ifIndex
     --
     Index ::= INTEGER       -- 1..ifNumber

     --
     --      the range of a Data Link Connection Identifier
     --
     DLCI ::= INTEGER        -- 0..DLCINumber


     --  Data Link Connection Management Interface

     --      The variables that configure the DLC Management Interface.

     frDlcmiTable OBJECT-TYPE
         SYNTAX   SEQUENCE OF FrDlcmiEntry
         ACCESS   not-accessible
         STATUS   mandatory
         DESCRIPTION
            "The Parameters for the Data Link Connection Management
            Interface for the frame relay service on this
            interface."
         REFERENCE



Brown, Baker & Carvalho                                         [Page 4]

RFC 1315                  Frame Relay DTE MIB                 April 1992


            "Draft American National Standard T1.617-1991, Annex D"
         ::= { frame-relay 1 }

         frDlcmiEntry OBJECT-TYPE
             SYNTAX   FrDlcmiEntry
             ACCESS   not-accessible
             STATUS   mandatory
             DESCRIPTION
                "The Parameters for a particular Data Link Con-
                nection Management Interface."
            INDEX { frDlcmiIfIndex }
            ::= { frDlcmiTable 1 }

         FrDlcmiEntry ::=
             SEQUENCE {
                 frDlcmiIfIndex
                     Index,
                 frDlcmiState
                     INTEGER,
                 frDlcmiAddress
                     INTEGER,
                 frDlcmiAddressLen
                     INTEGER,
                 frDlcmiPollingInterval
                     INTEGER,
                 frDlcmiFullEnquiryInterval
                     INTEGER,
                 frDlcmiErrorThreshold
                     INTEGER,
                 frDlcmiMonitoredEvents
                     INTEGER,
                 frDlcmiMaxSupportedVCs
                     INTEGER,
                 frDlcmiMulticast
                     INTEGER
         }



         frDlcmiIfIndex OBJECT-TYPE
             SYNTAX   Index
             ACCESS   read-only
             STATUS   mandatory
             DESCRIPTION
                "The ifIndex value of the  corresponding  ifEn-
                try."
            ::= { frDlcmiEntry 1 }




Brown, Baker & Carvalho                                         [Page 5]

RFC 1315                  Frame Relay DTE MIB                 April 1992


         frDlcmiState OBJECT-TYPE
             SYNTAX INTEGER {
                 noLmiConfigured (1),
                 lmiRev1         (2),
                 ansiT1-617-D    (3),  -- ANSI T1.617 Annex D
                 ansiT1-617-B    (4)   -- ANSI T1.617 Annex B
             }
             ACCESS   read-write
             STATUS   mandatory
             DESCRIPTION
                "This variable states which Data  Link  Connec-
                tion Management scheme is active (and by impli-
                cation, what DLCI it uses) on the  Frame  Relay
                interface."
            REFERENCE
               "Draft American National Standard T1.617-1991"
           ::= { frDlcmiEntry 2 }



         frDlcmiAddress OBJECT-TYPE
             SYNTAX      INTEGER {
                         q921           (1),  -- 13 bit DLCI
                         q922March90    (2),  -- 11 bit DLCI
                         q922November90 (3),  -- 10 bit DLCI
                         q922           (4)   -- Final Standard
             }
             ACCESS  read-write
             STATUS  mandatory
             DESCRIPTION
                "This variable states which address  format  is
                in use on the Frame Relay interface."
            ::= { frDlcmiEntry 3 }


         frDlcmiAddressLen OBJECT-TYPE
             SYNTAX  INTEGER {
                     two-octets (2),
                     three-octets (3),
                     four-octets (4)
             }
             ACCESS  read-write
             STATUS  mandatory
             DESCRIPTION
                "This variable states which address  length  in
                octets.  In the case of Q922 format, the length
                indicates the entire length of the address  in-
                cluding the control portion."



Brown, Baker & Carvalho                                         [Page 6]

RFC 1315                  Frame Relay DTE MIB                 April 1992


            ::= { frDlcmiEntry 4 }



         frDlcmiPollingInterval OBJECT-TYPE
             SYNTAX   INTEGER (5..30)
             ACCESS   read-write
             STATUS   mandatory
             DESCRIPTION
                "This is the number of seconds between  succes-
                sive status enquiry messages."
            REFERENCE
               "Draft American National  Standard  T1.617-1991,
               Section D.7 Timer T391."