rfc1461.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                                          D. Throop
Request for Comments: 1461                      Data General Corporation
                                                                May 1993


      SNMP MIB extension for Multiprotocol Interconnect over X.25

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 Multiprotocol
   Interconnect (including IP) traffic carried over X.25.  The objects
   defined here, along with the objects in the "SNMP MIB extension for
   the Packet Layer of X.25"[8], "SNMP MIB extension for LAPB"[7], and
   the "Definitions of Managed Objects for RS-232-like Hardware Devices"
   [6], combine to allow management of the traffic over an X.25 protocol
   stack.

Table of Contents

   1. The Network Management Framework .........................    1
   2. Objects ..................................................    2
   2.1 Format of Definitions ...................................    2
   3. Overview .................................................    3
   3.1 Scope ...................................................    3
   3.2 Structure of MIB objects ................................    3
   4. Definitions ..............................................    4
   5. Acknowledgements .........................................   19
   6. References ...............................................   20
   7. Security Considerations ...................................  21
   8. Author's Address .........................................   21

1.  The Network Management Framework

   The Internet-standard Network Management Framework consists of three
   components.  These components give the rules for defining objects,
   the definitions of objects, and the protocol for manipulating
   objects.




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   The network management framework structures objects in an abstract
   information tree. The branches of the tree name objects and the
   leaves of the tree contain the values manipulated to effect
   management. This tree is called the Management Information Base or
   MIB. The concepts of this tree are given in STD 16, RFC 1155, "The
   Structure of Management Information" or SMI [1]. The SMI defines the
   trunk of the tree and the types of objects used when defining the
   leaves. STD 16, RFC 1212, "Towards Concise MIB Definitions" [3],
   defines a more concise description mechanism that preserves all the
   principals of the SMI.

   The core MIB definitions for the Internet suite of protocols can be
   found in STD 17, RFC 1213 [4], "Management Information Base for
   Network Management of TCP/IP-based internets".

   STD 15, RFC 1157 [2] defines the SNMP protocol itself. The protocol
   defines how to manipulate the objects in a remote MIB.

   The tree structure of the MIB allows new objects to be defined for
   the purpose of experimentation and evaluation.

2.  Objects

   The definition of an object in the MIB requires an object name and
   type.  Object names and types are defined using the subset of
   Abstract Syntax Notation One (ASN.1) [5] defined in the SMI [1].
   Objects are named using ASN.1 object identifiers, administratively
   assigned names, to specify object types.  The object name, together
   with an optional object instance, uniquely identifies a specific
   instance of an object.  For human convenience, we often use a textual
   string, termed the descriptor, to refer to objects.

   Objects also have a syntax that defines the abstract data structure
   corresponding to that object type.  The ASN.1 language [5] provides
   the primitives used for this purpose.  The SMI [1] purposely
   restricts the ASN.1 constructs which may be used for simplicity and
   ease of implementation.

2.1.  Format of Definitions

   Section 4 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
   "Towards Concise MIB Definitions" [3].







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RFC 1461        Multiprotocol Interconnect on X.25 MIB          May 1993


3.  Overview

3.1.  Scope

   Instances of the objects defined below provide management information
   for Multiprotocol Interconnect traffic on X.25 as defined in RFC 1356
   [9].  That RFC describes how X.25 can be used to exchange IP or
   network level protocols. The multiprotocol packets (IP, CLNP, ES-IS,
   or SNAP) are encapsulated in X.25 frames for transmission between
   nodes.  All nodes that implement RFC 1356 must implement this MIB.

   The objects in this MIB apply to the software in the node that
   manages X.25 connections and performs the protocol encapsulation.  A
   node in this usage maybe the end node source or destination host for
   the packet, or it may be a router or bridge responsible for
   forwarding the packet.  Since RFC 1356 requires X.25, nodes that
   implement RFC 1356 must also implement the X.25 MIB, RFC 1382.

   This MIB only applies to Multiprotocol Interconnect over X.25
   service. It does not apply to other software that may also use X.25
   (for example PAD).  Thus the presence, absence, or operation of such
   software will not directly affect any of these objects.  (However
   connections in use by that software will appear in the X.25 MIB).

3.2.  Structure of MIB objects

   The objects of this MIB are organized into three tables:  the
   mioxPleTable, the mioxPeerTable, and the mioxPeerEncTable.  All
   objects in all tables are mandatory for conformance with this MIB.

   The mioxPleTable defines information relative to an interface used to
   carry Multiprotocol Interconnect traffic over X.25.  Such interfaces
   are identified by an ifType object in the Internet-standard MIB [4]
   of ddn-x25 or rfc877-x25.  Interfaces of type ddn-x25 have a self
   contained algorithm for translating between IP addresses and X.121
   addresses.  Interfaces of type rfc877-x25 do not have such an
   algorithm.  Note that not all X.25 Interfaces will be used to carry
   Multiprotocol Interconnect traffic. Those interfaces not carrying
   such traffic will not have entries in the mioxPleTable.  The entries
   in the mioxPleTable are only for interfaces that do carry
   Multiprotocol Interconnect traffic over X.25.  Entries in the
   mioxPleTable are indexed by ifIndex to make it easy to find the
   mioxPleTable entry for an interface.

   The mioxPeerTable contains information needed to contact an X.25 Peer
   to exchange packets.  This includes information such as the X.121
   address of the peer and a pointer to the X.25 call parameters needed
   to place the call.  The instance identifiers used for the objects in



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   this table are independent of any interface or other tables defined
   outside this MIB.  This table contains the ifIndex value of the X.25
   interface to use to call a peer.

   The mioxPeerEncTable contains information about the encapsulation
   type used to communicate with a peer.  This table is an extension of
   the mioxPeerTable in its instance identification. Each entry in the
   mioxPeerTable may have zero or more entries in this table.  This
   table will not have any entries that do not have correspondent
   entries in mioxPeerTable.

4.  Definitions


          MIOX25-MIB DEFINITIONS  ::= BEGIN

          IMPORTS
                  Counter,
                  TimeTicks
                          FROM RFC1155-SMI
                  OBJECT-TYPE
                          FROM RFC-1212
                  DisplayString, transmission,
                  ifIndex
                          FROM RFC1213-MIB
                  InstancePointer
                          FROM RFC1316-MIB
                  X121Address
                          FROM RFC1382-MIB
                  PositiveInteger
                          FROM RFC1381-MIB;

                          -- IP over X.25 MIB

          miox    OBJECT IDENTIFIER ::= { transmission 38 }

          mioxPle         OBJECT IDENTIFIER ::= { miox 1 }
          mioxPeer        OBJECT IDENTIFIER ::= { miox 2 }

          -- ###########################################################
          --              Ple Table
          -- ###########################################################

          -- Systems that implement RFC 1356 must also implement
          -- all objects in this group.

          mioxPleTable    OBJECT-TYPE
                  SYNTAX  SEQUENCE OF MioxPleEntry



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                  ACCESS  not-accessible
                  STATUS  mandatory
                  DESCRIPTION
                          "This table contains information relative to
                          an interface to an X.25 Packet Level Entity
                          (PLE)."
                  ::= { mioxPle 1   }

          mioxPleEntry    OBJECT-TYPE
                  SYNTAX  MioxPleEntry
                  ACCESS  not-accessible
                  STATUS  mandatory
                  DESCRIPTION
                          "These objects manage the encapsulation of
                          other protocols within X.25."
                  INDEX { ifIndex }
                  ::= { mioxPleTable 1 }

          MioxPleEntry ::= SEQUENCE {
                  mioxPleMaxCircuits
                          INTEGER,
                  mioxPleRefusedConnections
                          Counter,
                  mioxPleEnAddrToX121LkupFlrs
                          Counter,
                  mioxPleLastFailedEnAddr
                          OCTET STRING,
                  mioxPleEnAddrToX121LkupFlrTime
                          TimeTicks,
                  mioxPleX121ToEnAddrLkupFlrs
                          Counter,
                  mioxPleLastFailedX121Address
                          X121Address,
                  mioxPleX121ToEnAddrLkupFlrTime
                          TimeTicks,
                  mioxPleQbitFailures
                          Counter,
                  mioxPleQbitFailureRemoteAddress
                          X121Address,
                  mioxPleQbitFailureTime
                          TimeTicks,
                  mioxPleMinimumOpenTimer
                          PositiveInteger,
                  mioxPleInactivityTimer
                          PositiveInteger,
                  mioxPleHoldDownTimer
                          PositiveInteger,
                  mioxPleCollisionRetryTimer



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                          PositiveInteger,
                  mioxPleDefaultPeerId
                          InstancePointer
                  }

          mioxPleMaxCircuits OBJECT-TYPE
                  SYNTAX  INTEGER (0..2147483647)
                  ACCESS  read-write
                  STATUS  mandatory