rfc1474.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.


RFC 1474                     PPP/Bridge MIB                    June 1993


          }

          pppBridgeMediaMacType   OBJECT-TYPE
               SYNTAX    INTEGER(0..2147483647)
               ACCESS    read-only
               STATUS    mandatory
               DESCRIPTION
                         "The MAC type for which this entry in the
                         pppBridgeMediaTable is providing status
                         information. Valid values for this object are
                         defined in Section 6.6 MAC Type Support
                         Selection of RFC1220 (Bridging Point-to-Point
                         Protocol)."
               REFERENCE
                         "Section 6.6, MAC Type Support Selection, of
                         RFC1212."
               ::= { pppBridgeMediaEntry 1 }


          pppBridgeMediaLocalStatus   OBJECT-TYPE
               SYNTAX    INTEGER { accept(1), dont-accept(2) }
               ACCESS    read-only
               STATUS    mandatory
               DESCRIPTION
                         "Indicates whether the local PPP Bridging
                         Entity will accept packets of the protocol type
                         identified in pppBridgeMediaMacType on the PPP
                         link identified by ifIndex or not. If this
                         object is accept then any packets of the
                         indicated MAC type will be received and
                         properly processed. If this object is dont-
                         accept then received packets of the indicated
                         MAC type will not be properly processed."
               REFERENCE
                         "Section 6.6, MAC Type Support Selection, of
                         RFC1212."
               ::= { pppBridgeMediaEntry 2 }


          pppBridgeMediaRemoteStatus   OBJECT-TYPE
               SYNTAX    INTEGER { accept(1), dont-accept(2) }
               ACCESS    read-only
               STATUS    mandatory
               DESCRIPTION
                         "Indicates whether the local PPP Bridging
                         Entity believes that the remote PPP Bridging
                         Entity will accept packets of the protocol type
                         identified in pppBridgeMediaMacType on the PPP



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RFC 1474                     PPP/Bridge MIB                    June 1993


                         link identified by ifIndex or not."
               REFERENCE
                         "Section 6.6, MAC Type Support Selection, of
                         RFC1212."
               ::= { pppBridgeMediaEntry 3 }


          --
          -- The PPP Bridge Media Configuration Table
          --

          pppBridgeMediaConfigTable   OBJECT-TYPE
               SYNTAX    SEQUENCE OF PppBridgeMediaConfigEntry
               ACCESS    not-accessible
               STATUS    mandatory
               DESCRIPTION
                         "Table identifying which MAC media types are
                         enabled for the Bridging NCPs."
               ::= { pppBridge 4 }


          pppBridgeMediaConfigEntry   OBJECT-TYPE
               SYNTAX    PppBridgeMediaConfigEntry
               ACCESS    not-accessible
               STATUS    mandatory
               DESCRIPTION
                         "Status of a specific MAC Type for a specific
                         PPP Link."
               INDEX     { ifIndex, pppBridgeMediaConfigMacType }
               ::= { pppBridgeMediaConfigTable 1 }


          PppBridgeMediaConfigEntry ::= SEQUENCE {
               pppBridgeMediaConfigMacType
                    INTEGER,
               pppBridgeMediaConfigLocalStatus
                    INTEGER
          }


          pppBridgeMediaConfigMacType   OBJECT-TYPE
               SYNTAX    INTEGER(0..2147483647)
               ACCESS    read-write
               STATUS    mandatory
               DESCRIPTION
                         "The MAC type for which this entry in the
                         pppBridgeMediaConfigTable is providing status
                         information. Valid values for this object are



Kastenholz                                                     [Page 12]

RFC 1474                     PPP/Bridge MIB                    June 1993


                         defined in Section 6.6 MAC Type Support
                         Selection of RFC1220 (Bridging Point-to-Point
                         Protocol)."
               REFERENCE
                         "Section 6.6, MAC Type Support Selection, of
                         RFC1212."
               ::= { pppBridgeMediaConfigEntry 1 }


          pppBridgeMediaConfigLocalStatus   OBJECT-TYPE
               SYNTAX    INTEGER { accept(1), dont-accept(2) }
               ACCESS    read-write
               STATUS    mandatory
               DESCRIPTION
                         "Indicates whether the local PPP Bridging
                         Entity should accept packets of the protocol
                         type identified in pppBridgeMediaConfigMacType
                         on the PPP link identified by ifIndex or not.
                         Setting this object to the value dont-accept
                         has the affect of invalidating the
                         corresponding entry in the
                         pppBridgeMediaConfigTable object. It is an
                         implementation-specific matter as to whether
                         the agent removes an invalidated entry from the
                         table. Accordingly, management stations must be
                         prepared to receive tabular information from
                         agents that corresponds to entries not
                         currently in use. Changing this object will
                         have effect when the link is next restarted."
               REFERENCE
                         "Section 6.6, MAC Type Support Selection, of
                         RFC1212."
               ::= { pppBridgeMediaConfigEntry 2 }


          END

6.  Acknowledgements

   This document was produced by the PPP working group.  In addition to
   the working group, the author wishes to thank the following
   individuals for their comments and contributions:

          Bill Simpson -- Daydreamer
          Glenn McGregor -- Merit
          Jesse Walker -- DEC
          Chris Gunner -- DEC




Kastenholz                                                     [Page 13]

RFC 1474                     PPP/Bridge MIB                    June 1993


6.  Security Considerations

   The PPP MIB affords the network operator the ability to configure and
   control the PPP links of a particular system, including the PPP
   authentication protocols. This represents a security risk.

   These risks are addressed in the following manners:

      (1)  All variables which represent a significant security risk
           are placed in separate, optional, MIB Groups. As the MIB
           Group is the quantum of implementation within a MIB, the
           implementor of the MIB may elect not to implement these
           groups.

      (2)  The implementor may choose to implement the variables
           which present a security risk so that they may not be
           written, i.e., the variables are READ-ONLY. This method
           still presents a security risk, and is not recommended,
           in that the variables, specifically the PPP
           Authentication Protocols' variables, may be easily read.

      (3)  Using SNMPv2, the operator can place the variables into
           MIB views which are protected in that the parties which
           have access to those MIB views use authentication and
           privacy protocols, or the operator may elect to make
           these views not accessible to any party.  In order to
           facilitate this placement, all security-related variables
           are placed in separate MIB Tables. This eases the
           identification of the necessary MIB View Subtree.

7.  References

   [1] Rose M., and K. McCloghrie, "Structure and Identification of
       Management Information for TCP/IP-based internets", STD 16, RFC
       1155, Performance Systems International, Hughes LAN Systems, May
       1990.

   [2] McCloghrie K., and M. Rose, Editors, "Management Information Base
       for Network Management of TCP/IP-based internets", STD 17, RFC
       1213, Performance Systems International, March 1991.

   [3] Information processing systems - Open Systems Interconnection -
       Specification of Abstract Syntax Notation One (ASN.1),
       International Organization for Standardization, International
       Standard 8824, December 1987.

   [4] Information processing systems - Open Systems Interconnection -
       Specification of Basic Encoding Rules for Abstract Notation One



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RFC 1474                     PPP/Bridge MIB                    June 1993


       (ASN.1), International Organization for Standardization,
       International Standard 8825, December 1987.

   [5] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions",
       STD 16, RFC 1212, Performance Systems International, Hughes LAN
       Systems, March 1991.

   [6] Rose, M., Editor, "A Convention for Defining Traps for use with
       the SNMP", RFC 1215, Performance Systems International, March
       1991.

   [7] McCloghrie, K., "Extensions to the Generic-Interface MIB", RFC
       1229, Hughes LAN Systems, Inc., May 1991.

   [8] Simpson, W., "The Point-to-Point Protocol for the Transmission of
       Multi-protocol Datagrams over Point-to-Point Links, RFC 1331,
       Daydreamer, May 1992.

   [9] McGregor, G., "The PPP Internet Protocol Control Protocol", RFC
       1332, Merit, May 1992.

  [10] Baker, F., "Point-to-Point Protocol Extensions for Bridging", RFC
       1220, ACC, April 1991.

  [11] Lloyd, B., and W. Simpson, "PPP Authentication Protocols", RFC
       1334, L&A, Daydreamer, October 1992.

  [12] Simpson, W., "PPP Link Quality Monitoring", RFC 1333, Daydreamer,
       May 1992.

8.  Author's Address

   Frank Kastenholz
   FTP Software, Inc.
   2 High Street
   North Andover, Mass 01845 USA

   Phone: [phone]
   EMail: [e-mail]












Kastenholz                                                     [Page 15]