rfc2470.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

   Token Ring.

               0                   1
               0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
              +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              |     Type      |    Length     |
              +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              |                               |
              +-         Token Ring          -+
              |                               |
              +-           Address           -+
              |                               |
              +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Option fields:

         Type:     1 for Source Link-layer address.
                   2 for Target Link-layer address.

         Length:  1 (in units of 8 octets).







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RFC 2470                  IPv6 over Token Ring             December 1998


         Token Ring Address: The 48 bit Token Ring IEEE 802
            address, in canonical bit order. This is the address the
            interface currently responds to, and may be different from
            the built-in address used to derive the Interface
            Identifier.

            When source routing bridges are used, the source route for
            the path to a destination can be extracted from the RIF
            field of received Neighbor Advertisement messages. Note that
            the RIF field of received packets can be reversed into a
            source route suitable for transmitting return traffic by
            toggling the value of the 'D' bit and insuring that the
            Bcast field is set to indicate a Specifically Routed Frame.

7.  Address Mapping -- Multicast

   All IPv6 packets with multicast destination addresses are transmitted
   to Token Ring functional addresses. The following table shows the
   specific mapping between the IPv6 addresses and Token Ring functional
   addresses (in canonical form). Note that protocols other than IPv6
   may use these same functional addresses, so all Token Ring frames
   destined to these functional addresses are not guaranteed to be IPv6
   datagrams.

   MAC Addr (canonical)       IPv6 Multicast Addresses

   03-00-80-00-00-00  All-Nodes (FF01::1 and FF02::1) and
                      solicited node (FF02:0:0:0:0:1:FFXX:XXXX)
                      addresses

   03-00-40-00-00-00  All-Routers addresses (FF0X::2)

   03-00-00-80-00-00  any other multicast address with three
                      least significant bits = 000

   03-00-00-40-00-00  any other multicast address with three
                      least significant bits = 001

   03-00-00-20-00-00  any other multicast address with three
                      least significant bits = 010

   03-00-00-10-00-00  any other multicast address with three
                      least significant bits = 011

   03-00-00-08-00-00  any other multicast address with three
                       least significant bits = 100





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RFC 2470                  IPv6 over Token Ring             December 1998


   03-00-00-04-00-00  any other multicast address with three
                       least significant bits = 101

   03-00-00-02-00-00  any other multicast address with three
                       least significant bits = 110

   03-00-00-01-00-00  any other multicast address with three
                       least significant bits = 111

   In a bridged token ring network, all multicast packets SHOULD be sent
   with a RIF header specifying the use of the Spanning Tree Explorer.

   Note: it is believed that some (very) old bridge implementations do
   not properly support the Spanning Tree Explorer mechanism.  In such
   environments, multicast traffic sent through bridges must use a RIF
   with the All Routes Explorer. Consequently, an implementation MAY
   wish to allow the sending of IP multicast traffic using an All Routes
   Explorer. However, such an ability must be configurable by a system
   administrator and the default setting of the switch MUST be to use
   the Spanning Tree Explorer.

8.  Security Considerations

   Token Ring, like most broadcast LAN technologies, has inherent
   security vulnerabilities. For example, any sender can claim the
   identity of another and forge traffic. It is the responsibility of
   higher layers to take appropriate steps in those environments where
   such vulnerabilities are unacceptable.

9.  Acknowledgments

   Several members of the IEEE 802.5 Working Group contributed their
   knowledge and experience to the drafting of this specification,
   including Jim, Andrew Draper, George Lin, John Messenger, Kirk
   Preiss, and Trevor Warwick. The author would also like to thank many
   members of the IPng working group for their advice and suggestions,
   including Ran Atkinson, Scott Bradner, Steve Deering, Francis Dupont,
   Robert Elz, and Matt Thomas. A special thanks is due Steve Wise, who
   gave the most relevant advice of all by actually trying to implement
   this specification while it was in progress.











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RFC 2470                  IPv6 over Token Ring             December 1998


10.  References

   [802.5]   8802-5 : 1995 (ISO/IEC) [ANSI/IEEE 802.5, 1995
             Edition] Information technology--Telecommunications and
             information exchange between systems--Local and
             metropolitan area networks--Specific requirements-- Part 5:
             Token ring access method and physical layer specification.

   [AARCH]   Hinden, R. and S. Deering, "IP Version 6 Addressing
             Architecture", RFC 2373, July 1998.

   [ACONF]   Thomson, S. and T. Narten, "IPv6 Stateless Address
             Autoconfiguration", RFC 2462, December 1998.

   [BRIDGE]  10038: 1993 (ISO/IEC) [ANSI/IEEE Std 802.1D, 1993 Edition]
             Information technology--Telecommunications and information
             exchange between systems--Local area networks--Media access
             control (MAC) bridges.

   [CANON]   Narten, T. and C. Burton, "A Caution on Canonical Bit Order
             Of Link-Layer Addresses", RFC 2469, December 1998.

   [CONF]    Thomson, S. and T. Narten, "IPv6 Stateless Address
             Autoconfiguration", RFC 1971, August 1996.

   [DISC]    Narten, T., Nordmark, E. and W. Simpson, "Neighbor
             Discovery for IP Version 6 (IPv6)", RFC 2461, December
             1998.

   [EUI64]  "64-Bit Global Identifier Format Tutorial", http:
             //standards.ieee.org/db/oui/tutorials/EUI64.html.

   [IPV6]    Deering, S. and R. Hinden, "Internet Protocol, Version 6
             (IPv6) Specification", RFC 2460, December 1998.

   [KWORD]   Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels," BCP 14, RFC 2119, March 1997.

   [LLC]     8802-2 : 1994 (ISO/IEC) [ANSI/IEEE 802.2, 1994 Edition]
             Information technology--Telecommunications and information
             exchange between systems--Local and Metropolitan area
             networks--Specific requirements-- Part 2: Logical link
             control.








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RFC 2470                  IPv6 over Token Ring             December 1998


11.  Authors' Addresses

   Matt Crawford
   Fermilab MS 368
   PO Box 500
   Batavia, IL 60510 USA

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


   Thomas Narten
   IBM Corporation
   P.O. Box 12195
   Research Triangle Park, NC 27709-2195 USA

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


   Stephen Thomas
   TransNexus
   430 Tenth Street NW Suite N204
   Atlanta, GA 30318 USA

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
























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RFC 2470                  IPv6 over Token Ring             December 1998


Full Copyright Statement

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
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   The limited permissions granted above are perpetual and will not be
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   This document and the information contained herein is provided on an
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   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
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   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
























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