rfc2561.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                                           K. White
Request for Comments: 2561                                     IBM Corp.
Category: Standards Track                                       R. Moore
                                                               IBM Corp.
                                                              April 1999


                Base Definitions of Managed Objects for
                          TN3270E 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.

Copyright Notice

   Copyright (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   This memo defines a Management Information Base (MIB) for configuring
   and managing TN3270E servers.  TN3270E, defined by RFC 2355 [19],
   refers to the enhancements made to the Telnet 3270 (TN3270) terminal
   emulation practices.  Refer to RFC 1041 [18], STD 8, RFC 854 [16],
   and STD 31, RFC 860 [17] for a sample of what is meant by TN3270
   practices.

   The MIB defined by this memo provides generic support for both host
   and gateway TN3270E server implementations.  A TN3270E server
   connects a Telnet client performing 3270 emulation to a target SNA
   host over both a client-side network (client to TN3270E server) and
   an SNA Network (TN3270E server to target SNA host).  The client-side
   network is typically TCP/IP, but it need not be.

   A host TN3270E server refers to an implementation where the TN3270E
   server is collocated with the Systems Network Architecture (SNA)
   System Services Control Point (SSCP) for the dependent Secondary
   Logical Units (SLUs) that the server makes available to its clients
   for connecting into a SNA network.  A gateway TN3270E server resides
   on an SNA node other than an SSCP, either an SNA type 2.0 node, a
   boundary-function-attached type 2.1 node, or an APPN node acting in
   the role of a Dependent LU Requester (DLUR).  Host and gateway
   TN3270E server implementations typically differ greatly as to their
   internal implementation and system definition (SYSDEF) methods.



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   It is the intent that the MIB defined herein be extended by
   subsequent memos.  For example, one such extension enables collection
   of TN3270E response time data.

Table of Contents

   1.0  Introduction  . . . . . . . . . . . . . . . . . . . . . . .   2
   2.0  The SNMP Network Management Framework   . . . . . . . . . .   3
   3.0  Structure of the MIB  . . . . . . . . . . . . . . . . . . .   4
   3.1  TN3270E Server Control  . . . . . . . . . . . . . . . . . .   5
     3.1.1  tn3270eSrvrConfTable  . . . . . . . . . . . . . . . . .   5
     3.1.2  tn3270eSrvrPortTable  . . . . . . . . . . . . . . . . .   6
     3.1.3  tn3270eSrvrStatsTable   . . . . . . . . . . . . . . . .   7
   3.2  TN3270E Server Resource Configuration   . . . . . . . . . .   7
   3.3  Resource Name / Client Address Mappings   . . . . . . . . .   8
     3.3.1  tn3270eSnaMapTable  . . . . . . . . . . . . . . . . . .   8
     3.3.2  tn3270eResMapTable  . . . . . . . . . . . . . . . . . .   9
     3.3.3  tn3270eTcpConnTable   . . . . . . . . . . . . . . . . .   9
   3.4  Advisory Spin Lock Usage  . . . . . . . . . . . . . . . . .   9
   3.5  Row Persistence   . . . . . . . . . . . . . . . . . . . . .  10
   3.6  IANA Considerations   . . . . . . . . . . . . . . . . . . .  10
   4.0  Definitions   . . . . . . . . . . . . . . . . . . . . . . .  11
   5.0  Security Considerations   . . . . . . . . . . . . . . . . .  51
   6.0  Intellectual Property   . . . . . . . . . . . . . . . . . .  52
   7.0  Acknowledgments   . . . . . . . . . . . . . . . . . . . . .  53
   8.0  References  . . . . . . . . . . . . . . . . . . . . . . . .  53
   9.0  Authors' Addresses  . . . . . . . . . . . . . . . . . . . .  55
   Full Copyright Statement   . . . . . . . . . . . . . . . . . . .  56

1.0  Introduction

   This document is a product of the TN3270E Working Group.  Its purpose
   is to define a MIB module for support by a TCP/IP implementation for
   configuration and management of TN3270E servers.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119, reference
   [22].












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2.0  The SNMP Network Management Framework

   The SNMP Management Framework presently consists of five major
   components:

   o   An overall architecture, described in RFC 2271 [1].

   o   Mechanisms for describing and naming objects and events for the
       purpose of management.  The first version of this Structure of
       Management Information (SMI) is called SMIv1 and described in STD
       16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4].  The
       second version, called SMIv2, is described in RFC 1902 [5], RFC
       1903 [6] and RFC 1904 [7].

   o   Message protocols for transferring management information.  The
       first version of the SNMP message protocol is called SNMPv1 and
       described in STD 15, RFC 1157 [8].  A second version of the SNMP
       message protocol, which is not an Internet standards track
       protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC
       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].

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

   o   A set of fundamental applications described in RFC 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 (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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3.0  Structure of the MIB

   The TN3270E-MIB is split into the following components:

   o   TN3270E Server Control
   o   TN3270E Server Resource Configuration
   o   Resource/Client Address Mappings

   There are three additional sections to address:

   o   Advisory Spin Lock Usage
   o   Row Persistence
   o   IANA Considerations

   The TN3270E-MIB is defined primarily for TN3270E servers.  This memo
   does not explicitly address use of the MIB by TN3270 servers that do
   not support the TN3270E protocol.  Even though a significant number
   of the objects in the MIB do apply in the TN3270-only case, the case
   was not addressed, since it is unlikely that a TN3270-only server
   would implement this MIB.

   The SYSAPPL-MIB, reference [24], contains the Utf8String textual
   convention (TC) that the TN3270E-MIB imports.  This TC, which is used
   for some MIB objects containing textual information, enables
   internationalization of text strings, whereas the DisplayString TC
   does not.  The SNMP-FRAMEWORK-MIB, reference [1], contains the
   SnmpAdminString TC that the TN3270E-MIB also imports.  Like the
   Utf8String TC, this TC also enables internationalization of text
   strings; in addition, it provides some guidelines on the length and
   content of the strings.

   It is important to note that implementation of the SYSAPPL-MIB is not
   actually a prerequisite for implementing the TN3270E-MIB.  On the
   other hand, implementation of the TN3270E-MIB does not preclude
   implementing the SYSAPPL-MIB as well.  When both MIBs are
   implemented, the primary index into most of the TN3270E-MIB tables,
   tn3270eSrvrConfIndex, SHOULD equal one of the SYSAPPL-MIB's
   sysApplElmtRunIndex values.  In this case the entry in the
   sysApplElmtRunTable provides additional information on a TN3270E
   server.

   The MIB defined by this memo supports use of both IPv4 and IPv6
   addressing.  Two textual conventions, IANATn3270eAddrType and
   Tn3270eAddress, are defined for this purpose.  IANATn3270eAddress is
   essentially equivalent to the TAddress TC, defined by RFC 1903.  The
   difference between the two is that IANATn3270eAddress allows a zero-
   length octet string, while TAddress doesn't.  It is important that
   IANATn3270eAddress allow for the absence of an address, because some



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   objects with this syntax are used as table indexes, and have special
   meanings when they contain zero-length strings.

   The IANATn3270eAddrType textual convention is used rather than the
   TDomain TC (defined by RFC 1903) for identifying the contents of a
   tn3270eTAddress object.  TDomain uses an OID to characterize the
   contents of an associated TAddress object.  IANATn3270eAddrType was
   chosen over TDomain because, with a SYNTAX of Unsigned32 (enumeration
   type), it is much simpler to use as a component in an instance
   identifier.  It was placed in the IANA-administered module to allow
   for the addition of values to cover cases (such as proxy servers) not
   covered by the TN3270E-MIB itself.

3.1  TN3270E Server Control

   This group of objects provides for TN3270E server configuration and
   control.  It consists of three tables:

   o   tn3270eSrvrConfTable
   o   tn3270eSrvrPortTable
   o   tn3270eSrvrStatsTable

   The tn3270eSrvrConfTable is the primary table within the entire
   TN3270E-MIB.  As section 3.1.1 indicates, each TN3270E server is
   represented by an entry in this table, indexed by
   tn3270eSrvrConfIndex.  Most of the other tables defined by the
   TN3270E-MIB have tn3270eSrvrConfIndex as their primary index.
   Entries in these tables MUST NOT exist for a TN3270E server when it
   does not have a tn3270eSrvrConfigEntry.

3.1.1  tn3270eSrvrConfTable

   The tn3270eSrvrConfTable contains a set of objects primarily used for
   configuring and managing TN3270E servers.  As with most of the other
   tables in the TN3270E-MIB, this table is indexed by an unsigned
   integer, tn3270eSrvrConfIndex.  This primary index element enables
   support of multiple TN3270E servers by a single SNMP agent.  Within
   the set of MIB objects returned by one SNMP agent,
   tn3270eSrvrConfIndex values MUST be unique, and need not be
   contiguous.

   The tn3270eSrvrConfInactivityTimer object defines the inactivity
   period for user traffic on TN3270 and TN3270E sessions.








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   The four objects:

   o   tn3270eSrvrConfConnectivityChk
   o   tn3270eSrvrConfTmNopInterval
   o   tn3270eSrvrConfTmNopInactTime
   o   tn3270eSrvrConfTmTimeout

   define the parameters for performing the "Telnet Timing Mark Option"
   as defined by RFC 860 [17].  The object
   tn3270eSrvrConfConnectivityChk allows a Management Station to select
   either a NOP command or a TIMING-MARK command.  Sending a NOP command
   results in less overhead then a TIMING-MARK command, since a client
   doesn't send a reply.

   The objects tn3270eSrvrConfAdminStatus and tn3270eSrvrConfOperStatus
   enable remote starting and stopping of a TN3270E server, and report
   the current state of the server.  The object
   tn3270eSrvrConfFunctionsSupported indicates which of the TN3270 and
   TN3270E options a server supports.  The object
   tn3270eSrvrConfSessionTermState defines as a TN3270E server-wide
   option what SHOULD occur when the SNA portion of a TN3270 or TN3270E
   session terminates with respect to the associated TCP connection.
   The object tn3270eSrvrConfSrvrType indicates whether the TN3270E
   server represented by a tn3270eSrvrConfEntry is a host or a gateway
   server.  The object tn3270eSrvrConfContact provides a scratch pad
   area for a TN3270E server administrator to store information for
   later retrieval.  The object tn3270eSrvrConfLastActTime reports the
   DateAndTime when the server was most recently activated.  The special
   value of all '00'Hs indicates that the server has never been active.

   The object tn3270eSrvrConfRowStatus provides the capability to
   perform row creation and deletion operations on this table.

3.1.2  tn3270eSrvrPortTable

   The tn3270eSrvrPortTable represents the local TCP ports associated
   with a TN3270E server.  This information is important because some
   TN3270E server implementations support usage of multiple local ports.
   A tn3270eSrvrPortEntry is indexed by:

   o   tn3270eSrvrConfIndex
   o   tn3270eSrvrConfPort
   o   tn3270eSrvrConfPortAddrType
   o   tn3270eSrvrConfPortAddress

   Certain TN3270E server implementations restrict a local TCP port to a
   particular local IP address, instead of allowing connections for any
   local IP address to occur via the port.  tn3270eSrvrConfPortAddrType



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   and tn3270eSrvrConfPortAddress allow this restriction to be
   represented in the MIB.  A TN3270E server that doesn't restrict
   connections over a port to a local IP Address SHALL use the value